add support of nonpreemptive multitasking and additional comments
This commit is contained in:
Stefan Lankes
parent
fc33e338a4
commit
67926d7c65
20 changed files with 1003 additions and 99 deletions
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@ -1,7 +1,7 @@
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TOPDIR = $(shell pwd)
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TOPDIR = $(shell pwd)
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ARCH = x86
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ARCH = x86
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NAME = eduos
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NAME = eduos
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KERNDIRS = libkern kernel arch/$(ARCH)/kernel
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KERNDIRS = libkern kernel mm arch/$(ARCH)/kernel
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SUBDIRS = $(KERNDIRS)
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SUBDIRS = $(KERNDIRS)
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# Set your own cross compiler tool chain prefix here
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# Set your own cross compiler tool chain prefix here
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@ -81,6 +81,42 @@ inline static void rmb(void) { asm volatile("lfence" ::: "memory"); }
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/// Force strict CPU ordering, serializes store operations.
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/// Force strict CPU ordering, serializes store operations.
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inline static void wmb(void) { asm volatile("sfence" ::: "memory"); }
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inline static void wmb(void) { asm volatile("sfence" ::: "memory"); }
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/** @brief search the first most significant bit
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*
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* @param i source operand
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* @return
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* - first bit, which is set in the source operand
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* - invalid value, if not bit ist set
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*/
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static inline size_t msb(size_t i)
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{
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size_t ret;
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if (!i)
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return (sizeof(size_t)*8);
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asm volatile ("bsr %1, %0" : "=r"(ret) : "r"(i) : "cc");
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return ret;
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}
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/** @brief search the least significant bit
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*
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* @param i source operand
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* @return
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* - first bit, which is set in the source operand
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* - invalid value, if not bit ist set
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*/
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static inline size_t lsb(size_t i)
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{
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size_t ret;
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if (!i)
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return (sizeof(size_t)*8);
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asm volatile ("bsf %1, %0" : "=r"(ret) : "r"(i) : "cc");
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return ret;
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}
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/// A one-instruction-do-nothing
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/// A one-instruction-do-nothing
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#define NOP1 asm volatile ("nop")
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#define NOP1 asm volatile ("nop")
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/// A two-instruction-do-nothing
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/// A two-instruction-do-nothing
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@ -40,29 +40,15 @@
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extern "C" {
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extern "C" {
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#endif
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#endif
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#if __SIZEOF_POINTER__ == 4
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#define CONFIG_X86_32
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#define CONFIG_X86_32
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/// A popular type for addresses
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/// This type is used to represent the size of an object.
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typedef unsigned long size_t;
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typedef unsigned long size_t;
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/// Pointer differences
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/// Pointer differences
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typedef long ptrdiff_t;
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typedef long ptrdiff_t;
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#ifdef __KERNEL__
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/// It is similar to size_t, but must be a signed type.
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typedef long ssize_t;
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typedef long ssize_t;
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/// The type represents an offset and is similar to size_t, but must be a signed type.
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typedef long off_t;
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typedef long off_t;
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#endif
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#elif __SIZEOF_POINTER__ == 8
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#define CONFIG_X86_64
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// A popular type for addresses
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typedef unsigned long long size_t;
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/// Pointer differences
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typedef long long ptrdiff_t;
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#ifdef __KERNEL__
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typedef long long ssize_t;
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typedef long long off_t;
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#endif
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#else
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#error unsupported architecture
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#endif
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/// Unsigned 64 bit integer
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/// Unsigned 64 bit integer
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typedef unsigned long long uint64_t;
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typedef unsigned long long uint64_t;
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@ -83,22 +69,8 @@ typedef char int8_t;
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/// 16 bit wide char type
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/// 16 bit wide char type
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typedef unsigned short wchar_t;
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typedef unsigned short wchar_t;
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#ifndef _WINT_T
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/// This defines what the stack looks like after the task context is saved.
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#define _WINT_T
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typedef unsigned int wint_t;
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#endif
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/** @brief This defines what the stack looks like after an ISR was called.
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*
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* All the interrupt handler routines use this type for their only parameter.
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* Note: Our kernel doesn't use the GS and FS registers.
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*/
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struct state {
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struct state {
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#ifdef CONFIG_X86_32
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// ds register
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uint32_t ds;
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// es register
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uint32_t es;
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/// EDI register
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/// EDI register
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uint32_t edi;
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uint32_t edi;
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/// ESI register
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/// ESI register
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@ -116,61 +88,10 @@ struct state {
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/// EAX register
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/// EAX register
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uint32_t eax; /* pushed by 'pusha' */
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uint32_t eax; /* pushed by 'pusha' */
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/// Interrupt number
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// state of the controll register
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uint32_t int_no;
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// pushed by the processor automatically
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uint32_t error;
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uint32_t eip;
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uint32_t cs;
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uint32_t eflags;
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uint32_t eflags;
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uint32_t useresp;
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/// state of instruction pointer
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uint32_t ss;
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uint32_t eip;
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#elif defined(CONFIG_X86_64)
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/// R15 register
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uint64_t r15;
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/// R14 register
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uint64_t r14;
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/// R13 register
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uint64_t r13;
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/// R12 register
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uint64_t r12;
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/// R11 register
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uint64_t r11;
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/// R10 register
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uint64_t r10;
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/// R9 register
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uint64_t r9;
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/// R8 register
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uint64_t r8;
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/// RDI register
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uint64_t rdi;
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/// RSI register
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uint64_t rsi;
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/// RBP register
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uint64_t rbp;
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/// (pseudo) RSP register
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uint64_t rsp;
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/// RBX register
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uint64_t rbx;
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/// RDX register
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uint64_t rdx;
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/// RCX register
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uint64_t rcx;
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/// RAX register
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uint64_t rax;
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/// Interrupt number
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uint64_t int_no;
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// pushed by the processor automatically
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uint64_t error;
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uint64_t rip;
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uint64_t cs;
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uint64_t rflags;
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uint64_t userrsp;
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uint64_t ss;
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#endif
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};
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};
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#ifdef __cplusplus
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#ifdef __cplusplus
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68
arch/x86/include/asm/tasks.h
Normal file
68
arch/x86/include/asm/tasks.h
Normal file
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@ -0,0 +1,68 @@
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/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @author Stefan Lankes
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* @file arch/x86/include/asm/tasks.h
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* @brief Task related structure definitions
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*
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* This file contains the task_t structure definition
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* and task state define constants
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*/
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#ifndef __ASM_TASKS_H__
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#define __ASM_TASKS_H__
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#include <eduos/stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Switch to current task
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*
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* @param stack Pointer to the old stack pointer
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*/
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void switch_context(size_t** stack);
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/** @brief Setup a default frame for a new task
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*
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* @param task Pointer to the task structure
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* @param ep The entry point for code execution
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* @param arg Arguments list pointer for the task's stack
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* @return
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* - 0 on success
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* - -EINVAL (-22) on failure
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*/
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int create_default_frame(task_t* task, entry_point_t ep, void* arg);
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#ifdef __cplusplus
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}
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#endif
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#endif
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51
arch/x86/include/asm/tasks_types.h
Normal file
51
arch/x86/include/asm/tasks_types.h
Normal file
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@ -0,0 +1,51 @@
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/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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||||||
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @author Stefan Lankes
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* @file arch/x86/include/asm/tasks_types.h
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* @brief Task related structure definitions
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*
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* This file contains the task_t structure definition
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* and task state define constants
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*/
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#ifndef __ASM_TASKS_TYPES_H__
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#define __ASM_TASKS_TYPES_H__
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#include <eduos/stddef.h>
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#include <asm/processor.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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@ -1,4 +1,4 @@
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C_source := multiboot.c vga.c
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C_source := tasks.c multiboot.c vga.c
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ASM_source := entry.asm string32.asm
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ASM_source := entry.asm string32.asm
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MODULE := arch_x86_kernel
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MODULE := arch_x86_kernel
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@ -82,11 +82,34 @@ cpu_init:
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mov cr4, eax
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mov cr4, eax
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ret
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ret
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extern get_current_stack
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extern finish_task_switch
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global switch_context
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ALIGN 4
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switch_context:
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mov eax, [esp+4] ; on the stack is already the address to store the old esp
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pushf ; push controll register
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pusha ; push all general purpose registers...
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mov [eax], esp ; store old esp
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call get_current_stack ; get new esp
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xchg eax, esp
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; call cleanup code
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call finish_task_switch
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; restore context
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popa
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popf
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ret
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; Here is the definition of our stack. Remember that a stack actually grows
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; Here is the definition of our stack. Remember that a stack actually grows
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; downwards, so we declare the size of the data before declaring
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; downwards, so we declare the size of the data before declaring
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; the identifier 'default_stack_pointer'
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; the identifier 'default_stack_pointer'
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SECTION .data
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SECTION .data
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resb 8192 ; This reserves 8KBytes of memory here
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resb 8192 ; This reserves 8KBytes of memory here
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global default_stack_pointer
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default_stack_pointer:
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default_stack_pointer:
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SECTION .note.GNU-stack noalloc noexec nowrite progbits
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SECTION .note.GNU-stack noalloc noexec nowrite progbits
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89
arch/x86/kernel/tasks.c
Normal file
89
arch/x86/kernel/tasks.c
Normal file
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@ -0,0 +1,89 @@
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/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
* * Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
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* * Neither the name of the University nor the names of its contributors
|
||||||
|
* may be used to endorse or promote products derived from this
|
||||||
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* software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||||
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
||||||
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||||
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||||
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <eduos/stdio.h>
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#include <eduos/stdlib.h>
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#include <eduos/string.h>
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#include <eduos/tasks.h>
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#include <eduos/errno.h>
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#include <eduos/processor.h>
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size_t* get_current_stack(void)
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{
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task_t* curr_task = current_task;
|
||||||
|
|
||||||
|
return curr_task->last_stack_pointer;
|
||||||
|
}
|
||||||
|
|
||||||
|
int create_default_frame(task_t* task, entry_point_t ep, void* arg)
|
||||||
|
{
|
||||||
|
size_t *stack;
|
||||||
|
struct state *stptr;
|
||||||
|
size_t state_size;
|
||||||
|
|
||||||
|
if (BUILTIN_EXPECT(!task, 0))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
if (BUILTIN_EXPECT(!task->stack, 0))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
memset(task->stack, 0xCD, KERNEL_STACK_SIZE);
|
||||||
|
|
||||||
|
/* The difference between setting up a task for SW-task-switching
|
||||||
|
* and not for HW-task-switching is setting up a stack and not a TSS.
|
||||||
|
* This is the stack which will be activated and popped off for iret later.
|
||||||
|
*/
|
||||||
|
stack = (size_t*) (task->stack + KERNEL_STACK_SIZE - 16); // => stack is 16byte aligned
|
||||||
|
|
||||||
|
/* Only marker for debugging purposes, ... */
|
||||||
|
*stack-- = 0xDEADBEEF;
|
||||||
|
/* the first-function-to-be-called's arguments, ... */
|
||||||
|
*stack-- = (size_t) arg;
|
||||||
|
|
||||||
|
/* and the "caller" we shall return to.
|
||||||
|
* This procedure cleans the task after exit. */
|
||||||
|
*stack = (size_t) leave_kernel_task;
|
||||||
|
|
||||||
|
/* Next bunch on the stack is the initial register state.
|
||||||
|
* The stack must look like the stack of a task which was
|
||||||
|
* scheduled away previously. */
|
||||||
|
|
||||||
|
state_size = sizeof(struct state);
|
||||||
|
stack = (size_t*) ((size_t) stack - state_size);
|
||||||
|
|
||||||
|
stptr = (struct state *) stack;
|
||||||
|
memset(stptr, 0x00, state_size);
|
||||||
|
stptr->esp = (size_t)stack + state_size;
|
||||||
|
|
||||||
|
stptr->eip = (size_t)ep;
|
||||||
|
stptr->eflags = 0x1202;
|
||||||
|
|
||||||
|
/* Set the task's stack pointer entry to the stack we have crafted right now. */
|
||||||
|
task->last_stack_pointer = (size_t*)stack;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
@ -33,7 +33,10 @@ extern "C" {
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
#define EDUOS_VERSION "0.1"
|
#define EDUOS_VERSION "0.1"
|
||||||
|
#define MAX_TASKS 16
|
||||||
#define VIDEO_MEM_ADDR 0xB8000 // the video memora address
|
#define VIDEO_MEM_ADDR 0xB8000 // the video memora address
|
||||||
|
#define CACHE_LINE 64
|
||||||
|
#define KERNEL_STACK_SIZE (8*1024)
|
||||||
|
|
||||||
#define BYTE_ORDER LITTLE_ENDIAN
|
#define BYTE_ORDER LITTLE_ENDIAN
|
||||||
|
|
||||||
|
|
|
||||||
180
include/eduos/errno.h
Normal file
180
include/eduos/errno.h
Normal file
|
|
@ -0,0 +1,180 @@
|
||||||
|
/**
|
||||||
|
* @author Stefan Lankes
|
||||||
|
* @file include/eduos/errno.h
|
||||||
|
* @brief Error number define constants
|
||||||
|
*
|
||||||
|
* This file just contains the full list of error numbers which can
|
||||||
|
* be returned somewhere. In principle, we use the same error codes
|
||||||
|
* than newlib.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __ERRNO_H__
|
||||||
|
#define __ERRNO_H__
|
||||||
|
|
||||||
|
#include <eduos/config.h>
|
||||||
|
#include <asm/stddef.h>
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define EPERM 1 /* Not super-user */
|
||||||
|
#define ENOENT 2 /* No such file or directory */
|
||||||
|
#define ESRCH 3 /* No such process */
|
||||||
|
#define EINTR 4 /* Interrupted system call */
|
||||||
|
#define EIO 5 /* I/O error */
|
||||||
|
#define ENXIO 6 /* No such device or address */
|
||||||
|
#define E2BIG 7 /* Arg list too long */
|
||||||
|
#define ENOEXEC 8 /* Exec format error */
|
||||||
|
#define EBADF 9 /* Bad file number */
|
||||||
|
#define ECHILD 10 /* No children */
|
||||||
|
#define EAGAIN 11 /* No more processes */
|
||||||
|
#define ENOMEM 12 /* Not enough core */
|
||||||
|
#define EACCES 13 /* Permission denied */
|
||||||
|
#define EFAULT 14 /* Bad address */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ENOTBLK 15 /* Block device required */
|
||||||
|
#endif
|
||||||
|
#define EBUSY 16 /* Mount device busy */
|
||||||
|
#define EEXIST 17 /* File exists */
|
||||||
|
#define EXDEV 18 /* Cross-device link */
|
||||||
|
#define ENODEV 19 /* No such device */
|
||||||
|
#define ENOTDIR 20 /* Not a directory */
|
||||||
|
#define EISDIR 21 /* Is a directory */
|
||||||
|
#define EINVAL 22 /* Invalid argument */
|
||||||
|
#define ENFILE 23 /* Too many open files in system */
|
||||||
|
#define EMFILE 24 /* Too many open files */
|
||||||
|
#define ENOTTY 25 /* Not a typewriter */
|
||||||
|
#define ETXTBSY 26 /* Text file busy */
|
||||||
|
#define EFBIG 27 /* File too large */
|
||||||
|
#define ENOSPC 28 /* No space left on device */
|
||||||
|
#define ESPIPE 29 /* Illegal seek */
|
||||||
|
#define EROFS 30 /* Read only file system */
|
||||||
|
#define EMLINK 31 /* Too many links */
|
||||||
|
#define EPIPE 32 /* Broken pipe */
|
||||||
|
#define EDOM 33 /* Math arg out of domain of func */
|
||||||
|
#define ERANGE 34 /* Math result not representable */
|
||||||
|
#define ENOMSG 35 /* No message of desired type */
|
||||||
|
#define EIDRM 36 /* Identifier removed */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ECHRNG 37 /* Channel number out of range */
|
||||||
|
#define EL2NSYNC 38 /* Level 2 not synchronized */
|
||||||
|
#define EL3HLT 39 /* Level 3 halted */
|
||||||
|
#define EL3RST 40 /* Level 3 reset */
|
||||||
|
#define ELNRNG 41 /* Link number out of range */
|
||||||
|
#define EUNATCH 42 /* Protocol driver not attached */
|
||||||
|
#define ENOCSI 43 /* No CSI structure available */
|
||||||
|
#define EL2HLT 44 /* Level 2 halted */
|
||||||
|
#endif
|
||||||
|
#define EDEADLK 45 /* Deadlock condition */
|
||||||
|
#define ENOLCK 46 /* No record locks available */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define EBADE 50 /* Invalid exchange */
|
||||||
|
#define EBADR 51 /* Invalid request descriptor */
|
||||||
|
#define EXFULL 52 /* Exchange full */
|
||||||
|
#define ENOANO 53 /* No anode */
|
||||||
|
#define EBADRQC 54 /* Invalid request code */
|
||||||
|
#define EBADSLT 55 /* Invalid slot */
|
||||||
|
#define EDEADLOCK 56 /* File locking deadlock error */
|
||||||
|
#define EBFONT 57 /* Bad font file fmt */
|
||||||
|
#endif
|
||||||
|
#define ENOSTR 60 /* Device not a stream */
|
||||||
|
#define ENODATA 61 /* No data (for no delay io) */
|
||||||
|
#define ETIME 62 /* Timer expired */
|
||||||
|
#define ENOSR 63 /* Out of streams resources */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ENONET 64 /* Machine is not on the network */
|
||||||
|
#define ENOPKG 65 /* Package not installed */
|
||||||
|
#define EREMOTE 66 /* The object is remote */
|
||||||
|
#endif
|
||||||
|
#define ENOLINK 67 /* The link has been severed */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define EADV 68 /* Advertise error */
|
||||||
|
#define ESRMNT 69 /* Srmount error */
|
||||||
|
#define ECOMM 70 /* Communication error on send */
|
||||||
|
#endif
|
||||||
|
#define EPROTO 71 /* Protocol error */
|
||||||
|
#define EMULTIHOP 74 /* Multihop attempted */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ELBIN 75 /* Inode is remote (not really error) */
|
||||||
|
#define EDOTDOT 76 /* Cross mount point (not really error) */
|
||||||
|
#endif
|
||||||
|
#define EBADMSG 77 /* Trying to read unreadable message */
|
||||||
|
#define EFTYPE 79 /* Inappropriate file type or format */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ENOTUNIQ 80 /* Given log. name not unique */
|
||||||
|
#define EBADFD 81 /* f.d. invalid for this operation */
|
||||||
|
#define EREMCHG 82 /* Remote address changed */
|
||||||
|
#define ELIBACC 83 /* Can't access a needed shared lib */
|
||||||
|
#define ELIBBAD 84 /* Accessing a corrupted shared lib */
|
||||||
|
#define ELIBSCN 85 /* .lib section in a.out corrupted */
|
||||||
|
#define ELIBMAX 86 /* Attempting to link in too many libs */
|
||||||
|
#define ELIBEXEC 87 /* Attempting to exec a shared library */
|
||||||
|
#endif
|
||||||
|
#define ENOSYS 88 /* Function not implemented */
|
||||||
|
#ifdef __CYGWIN__
|
||||||
|
#define ENMFILE 89 /* No more files */
|
||||||
|
#endif
|
||||||
|
#define ENOTEMPTY 90 /* Directory not empty */
|
||||||
|
#define ENAMETOOLONG 91 /* File or path name too long */
|
||||||
|
#define ELOOP 92 /* Too many symbolic links */
|
||||||
|
#define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */
|
||||||
|
#define EPFNOSUPPORT 96 /* Protocol family not supported */
|
||||||
|
#define ECONNRESET 104 /* Connection reset by peer */
|
||||||
|
#define ENOBUFS 105 /* No buffer space available */
|
||||||
|
#define EAFNOSUPPORT 106 /* Address family not supported by protocol family */
|
||||||
|
#define EPROTOTYPE 107 /* Protocol wrong type for socket */
|
||||||
|
#define ENOTSOCK 108 /* Socket operation on non-socket */
|
||||||
|
#define ENOPROTOOPT 109 /* Protocol not available */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ESHUTDOWN 110 /* Can't send after socket shutdown */
|
||||||
|
#endif
|
||||||
|
#define ECONNREFUSED 111 /* Connection refused */
|
||||||
|
#define EADDRINUSE 112 /* Address already in use */
|
||||||
|
#define ECONNABORTED 113 /* Connection aborted */
|
||||||
|
#define ENETUNREACH 114 /* Network is unreachable */
|
||||||
|
#define ENETDOWN 115 /* Network interface is not configured */
|
||||||
|
#define ETIMEDOUT 116 /* Connection timed out */
|
||||||
|
#define EHOSTDOWN 117 /* Host is down */
|
||||||
|
#define EHOSTUNREACH 118 /* Host is unreachable */
|
||||||
|
#define EINPROGRESS 119 /* Connection already in progress */
|
||||||
|
#define EALREADY 120 /* Socket already connected */
|
||||||
|
#define EDESTADDRREQ 121 /* Destination address required */
|
||||||
|
#define EMSGSIZE 122 /* Message too long */
|
||||||
|
#define EPROTONOSUPPORT 123 /* Unknown protocol */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ESOCKTNOSUPPORT 124 /* Socket type not supported */
|
||||||
|
#endif
|
||||||
|
#define EADDRNOTAVAIL 125 /* Address not available */
|
||||||
|
#define ENETRESET 126
|
||||||
|
#define EISCONN 127 /* Socket is already connected */
|
||||||
|
#define ENOTCONN 128 /* Socket is not connected */
|
||||||
|
#define ETOOMANYREFS 129
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define EPROCLIM 130
|
||||||
|
#define EUSERS 131
|
||||||
|
#endif
|
||||||
|
#define EDQUOT 132
|
||||||
|
#define ESTALE 133
|
||||||
|
#define ENOTSUP 134 /* Not supported */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ENOMEDIUM 135 /* No medium (in tape drive) */
|
||||||
|
#endif
|
||||||
|
#ifdef __CYGWIN__
|
||||||
|
#define ENOSHARE 136 /* No such host or network path */
|
||||||
|
#define ECASECLASH 137 /* Filename exists with different case */
|
||||||
|
#endif
|
||||||
|
#define EILSEQ 138
|
||||||
|
#define EOVERFLOW 139 /* Value too large for defined data type */
|
||||||
|
#define ECANCELED 140 /* Operation canceled */
|
||||||
|
#define ENOTRECOVERABLE 141 /* State not recoverable */
|
||||||
|
#define EOWNERDEAD 142 /* Previous owner died */
|
||||||
|
#ifdef __LINUX_ERRNO_EXTENSIONS__
|
||||||
|
#define ESTRPIPE 143 /* Streams pipe error */
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif
|
||||||
|
|
@ -28,17 +28,27 @@
|
||||||
#ifndef __STDARG_H__
|
#ifndef __STDARG_H__
|
||||||
#define __STDARG_H__
|
#define __STDARG_H__
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @author Stefan Lankes
|
||||||
|
* @file include/eduos/stdarg.h
|
||||||
|
* @brief Definition of variable argument lists
|
||||||
|
*/
|
||||||
|
|
||||||
#ifdef __cplusplus
|
#ifdef __cplusplus
|
||||||
extern "C" {
|
extern "C" {
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
typedef __builtin_va_list va_list;
|
typedef __builtin_va_list va_list;
|
||||||
|
|
||||||
|
/// Initialize a variable argument list
|
||||||
#define va_start __builtin_va_start
|
#define va_start __builtin_va_start
|
||||||
|
/// Retrieve next argument
|
||||||
#define va_arg __builtin_va_arg
|
#define va_arg __builtin_va_arg
|
||||||
#define va_end __builtin_va_end
|
/// End using variable argument list
|
||||||
|
#define va_end __builtin_va_end
|
||||||
|
/// copies the (previously initialized) variable argument list
|
||||||
#define va_copy __builtin_va_copy
|
#define va_copy __builtin_va_copy
|
||||||
|
|
||||||
#ifdef __cplusplus
|
#ifdef __cplusplus
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
|
|
|
||||||
|
|
@ -28,6 +28,12 @@
|
||||||
#ifndef __STDDEF_H__
|
#ifndef __STDDEF_H__
|
||||||
#define __STDDEF_H__
|
#define __STDDEF_H__
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @author Stefan Lankes
|
||||||
|
* @file include/eduos/stddef.h
|
||||||
|
* @brief Definition of basic data types
|
||||||
|
*/
|
||||||
|
|
||||||
#include <eduos/config.h>
|
#include <eduos/config.h>
|
||||||
#include <asm/stddef.h>
|
#include <asm/stddef.h>
|
||||||
|
|
||||||
|
|
@ -37,12 +43,12 @@ extern "C" {
|
||||||
|
|
||||||
#define NULL ((void*) 0)
|
#define NULL ((void*) 0)
|
||||||
|
|
||||||
/*
|
/// represents a task identifier
|
||||||
* macros, which are later used to determine the core id
|
typedef unsigned int tid_t;
|
||||||
* and their "private" data
|
|
||||||
*/
|
struct task;
|
||||||
#define per_core(name) name
|
/// pointer to the current (running) task
|
||||||
#define CORE_ID 0
|
extern struct task* current_task;
|
||||||
|
|
||||||
#ifdef __cplusplus
|
#ifdef __cplusplus
|
||||||
}
|
}
|
||||||
|
|
|
||||||
|
|
@ -44,6 +44,12 @@
|
||||||
extern "C" {
|
extern "C" {
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
|
/** @brief Create a new stack for a new task
|
||||||
|
*
|
||||||
|
* @return start address of the new stack
|
||||||
|
*/
|
||||||
|
void* create_stack(tid_t id);
|
||||||
|
|
||||||
#ifdef __cplusplus
|
#ifdef __cplusplus
|
||||||
}
|
}
|
||||||
#endif
|
#endif
|
||||||
|
|
|
||||||
|
|
@ -28,6 +28,12 @@
|
||||||
#ifndef __STRING_H__
|
#ifndef __STRING_H__
|
||||||
#define __STRING_H__
|
#define __STRING_H__
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @author Stefan Lankes
|
||||||
|
* @file include/eduos/string.h
|
||||||
|
* @brief Definition of basic string and memory opeations
|
||||||
|
*/
|
||||||
|
|
||||||
#include <eduos/stddef.h>
|
#include <eduos/stddef.h>
|
||||||
#include <asm/string.h>
|
#include <asm/string.h>
|
||||||
|
|
||||||
|
|
|
||||||
84
include/eduos/tasks.h
Normal file
84
include/eduos/tasks.h
Normal file
|
|
@ -0,0 +1,84 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
* * Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* * Neither the name of the University nor the names of its contributors
|
||||||
|
* may be used to endorse or promote products derived from this
|
||||||
|
* software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||||
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
||||||
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||||
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||||
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||||
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @author Stefan Lankes
|
||||||
|
* @file include/eduos/tasks.h
|
||||||
|
* @brief Task related
|
||||||
|
*
|
||||||
|
* Create and leave tasks or fork them.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __TASKS_H__
|
||||||
|
#define __TASKS_H__
|
||||||
|
|
||||||
|
#include <eduos/stddef.h>
|
||||||
|
#include <eduos/tasks_types.h>
|
||||||
|
#include <asm/tasks.h>
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/** @brief Initialize the multitasking subsystem
|
||||||
|
*
|
||||||
|
* This procedure sets the current task to the
|
||||||
|
* current "task" (there are no tasks, yet) and that was it.
|
||||||
|
*
|
||||||
|
* @return
|
||||||
|
* - 0 on success
|
||||||
|
* - -ENOMEM (-12) on failure
|
||||||
|
*/
|
||||||
|
int multitasking_init(void);
|
||||||
|
|
||||||
|
/** @brief create a kernel task.
|
||||||
|
*
|
||||||
|
* @param id The value behind this pointer will be set to the new task's id
|
||||||
|
* @param ep Pointer to the entry function for the new task
|
||||||
|
* @param args Arguments the task shall start with
|
||||||
|
* @param prio Desired priority of the new kernel task
|
||||||
|
*
|
||||||
|
* @return
|
||||||
|
* - 0 on success
|
||||||
|
* - -EINVAL (-22) on failure
|
||||||
|
*/
|
||||||
|
int create_kernel_task(tid_t* id, entry_point_t ep, void* args, uint8_t prio);
|
||||||
|
|
||||||
|
/** @brief Call to rescheduling
|
||||||
|
*
|
||||||
|
* This is a purely assembled procedure for rescheduling
|
||||||
|
*/
|
||||||
|
void reschedule(void);
|
||||||
|
|
||||||
|
/** @brief This function shall be called by leaving kernel level tasks */
|
||||||
|
void NORETURN leave_kernel_task(void);
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif
|
||||||
104
include/eduos/tasks_types.h
Normal file
104
include/eduos/tasks_types.h
Normal file
|
|
@ -0,0 +1,104 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
* * Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* * Neither the name of the University nor the names of its contributors
|
||||||
|
* may be used to endorse or promote products derived from this
|
||||||
|
* software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||||
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
||||||
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||||
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||||
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||||
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @author Stefan Lankes
|
||||||
|
* @file include/eduos/tasks_types.h
|
||||||
|
* @brief Task related structure definitions
|
||||||
|
*
|
||||||
|
* This file contains the task_t structure definition
|
||||||
|
* and task state define constants
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef __TASKS_TYPES_H__
|
||||||
|
#define __TASKS_TYPES_H__
|
||||||
|
|
||||||
|
#include <eduos/stddef.h>
|
||||||
|
#include <asm/tasks_types.h>
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define TASK_INVALID 0
|
||||||
|
#define TASK_READY 1
|
||||||
|
#define TASK_RUNNING 2
|
||||||
|
#define TASK_BLOCKED 3
|
||||||
|
#define TASK_FINISHED 4
|
||||||
|
#define TASK_IDLE 5
|
||||||
|
|
||||||
|
#define MAX_PRIO 31
|
||||||
|
#define REALTIME_PRIO 31
|
||||||
|
#define HIGH_PRIO 16
|
||||||
|
#define NORMAL_PRIO 8
|
||||||
|
#define LOW_PRIO 1
|
||||||
|
#define IDLE_PRIO 0
|
||||||
|
|
||||||
|
typedef int (*entry_point_t)(void*);
|
||||||
|
|
||||||
|
/** @brief Represents a the process control block */
|
||||||
|
typedef struct task {
|
||||||
|
/// Task id = position in the task table
|
||||||
|
tid_t id;
|
||||||
|
/// Task status (INVALID, READY, RUNNING, ...)
|
||||||
|
uint32_t status;
|
||||||
|
/// copy of the stack pointer before a context switch
|
||||||
|
size_t* last_stack_pointer;
|
||||||
|
/// start address of the stack
|
||||||
|
void* stack;
|
||||||
|
/// Task priority
|
||||||
|
uint8_t prio;
|
||||||
|
/// next task in the queue
|
||||||
|
struct task* next;
|
||||||
|
/// previous task in the queue
|
||||||
|
struct task* prev;
|
||||||
|
} task_t;
|
||||||
|
|
||||||
|
typedef struct {
|
||||||
|
task_t* first;
|
||||||
|
task_t* last;
|
||||||
|
} task_list_t;
|
||||||
|
|
||||||
|
/** @brief Represents a queue for all runable tasks */
|
||||||
|
typedef struct {
|
||||||
|
/// idle task
|
||||||
|
task_t* idle __attribute__ ((aligned (CACHE_LINE)));
|
||||||
|
/// previous task
|
||||||
|
task_t* old_task;
|
||||||
|
/// total number of tasks in the queue
|
||||||
|
uint32_t nr_tasks;
|
||||||
|
/// indicates the used priority queues
|
||||||
|
uint32_t prio_bitmap;
|
||||||
|
/// a queue for each priority
|
||||||
|
task_list_t queue[MAX_PRIO];
|
||||||
|
} runqueue_t;
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif
|
||||||
|
|
@ -1,4 +1,4 @@
|
||||||
C_source := main.c
|
C_source := main.c tasks.c
|
||||||
MODULE := kernel
|
MODULE := kernel
|
||||||
|
|
||||||
include $(TOPDIR)/Makefile.inc
|
include $(TOPDIR)/Makefile.inc
|
||||||
|
|
|
||||||
|
|
@ -28,7 +28,9 @@
|
||||||
#include <eduos/stddef.h>
|
#include <eduos/stddef.h>
|
||||||
#include <eduos/stdio.h>
|
#include <eduos/stdio.h>
|
||||||
#include <eduos/string.h>
|
#include <eduos/string.h>
|
||||||
|
#include <eduos/tasks.h>
|
||||||
#include <eduos/processor.h>
|
#include <eduos/processor.h>
|
||||||
|
#include <eduos/tasks.h>
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Note that linker symbols are not variables, they have no memory allocated for
|
* Note that linker symbols are not variables, they have no memory allocated for
|
||||||
|
|
@ -41,24 +43,42 @@ extern const void bss_end;
|
||||||
extern char __BUILD_DATE;
|
extern char __BUILD_DATE;
|
||||||
extern char __BUILD_TIME;
|
extern char __BUILD_TIME;
|
||||||
|
|
||||||
|
static int foo(void* arg)
|
||||||
|
{
|
||||||
|
int i = 0;
|
||||||
|
|
||||||
|
for(i=0; i<5; i++) {
|
||||||
|
kprintf("hello from %s\n", (char*) arg);
|
||||||
|
reschedule();
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
static int eduos_init(void)
|
static int eduos_init(void)
|
||||||
{
|
{
|
||||||
// initialize .bss section
|
// initialize .bss section
|
||||||
memset((void*)&bss_start, 0x00, ((size_t) &bss_end - (size_t) &bss_start));
|
memset((void*)&bss_start, 0x00, ((size_t) &bss_end - (size_t) &bss_start));
|
||||||
|
|
||||||
koutput_init();
|
koutput_init();
|
||||||
|
multitasking_init();
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
int main(void)
|
int main(void)
|
||||||
{
|
{
|
||||||
|
tid_t id1;
|
||||||
|
tid_t id2;
|
||||||
eduos_init();
|
eduos_init();
|
||||||
|
|
||||||
kprintf("This is eduOS %s Build %u, %u\n", EDUOS_VERSION, &__BUILD_DATE, &__BUILD_TIME);
|
kprintf("This is eduOS %s Build %u, %u\n", EDUOS_VERSION, &__BUILD_DATE, &__BUILD_TIME);
|
||||||
kprintf("Kernel starts at %p and ends at %p\n", &kernel_start, &kernel_end);
|
kprintf("Kernel starts at %p and ends at %p\n", &kernel_start, &kernel_end);
|
||||||
kprintf("\nHello World!\n");
|
|
||||||
|
create_kernel_task(&id1, foo, "foo1", NORMAL_PRIO);
|
||||||
|
create_kernel_task(&id2, foo, "foo2", NORMAL_PRIO);
|
||||||
|
reschedule();
|
||||||
|
|
||||||
while(1) {
|
while(1) {
|
||||||
NOP8;
|
NOP8;
|
||||||
}
|
}
|
||||||
|
|
|
||||||
254
kernel/tasks.c
Normal file
254
kernel/tasks.c
Normal file
|
|
@ -0,0 +1,254 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
* * Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* * Neither the name of the University nor the names of its contributors
|
||||||
|
* may be used to endorse or promote products derived from this
|
||||||
|
* software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||||
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
||||||
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||||
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||||
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||||
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <eduos/stddef.h>
|
||||||
|
#include <eduos/stdlib.h>
|
||||||
|
#include <eduos/stdio.h>
|
||||||
|
#include <eduos/tasks.h>
|
||||||
|
#include <eduos/tasks_types.h>
|
||||||
|
#include <eduos/errno.h>
|
||||||
|
|
||||||
|
extern void* default_stack_pointer;
|
||||||
|
|
||||||
|
/** @brief Array of task structures (aka PCB)
|
||||||
|
*
|
||||||
|
* A task's id will be its position in this array.
|
||||||
|
*/
|
||||||
|
static task_t task_table[MAX_TASKS] = { \
|
||||||
|
[0] = {0, TASK_IDLE, NULL, NULL, 0, NULL, NULL}, \
|
||||||
|
[1 ... MAX_TASKS-1] = {0, TASK_INVALID, NULL, NULL, 0, NULL, NULL}};
|
||||||
|
|
||||||
|
static runqueue_t runqueue = { task_table+0, NULL, 0, 0, {[0 ... MAX_PRIO-1] = {NULL, NULL}}};
|
||||||
|
|
||||||
|
task_t* current_task = task_table+0;
|
||||||
|
|
||||||
|
/** @brief helper function for the assembly code to determine the current task
|
||||||
|
* @return Pointer to the task_t structure of current task
|
||||||
|
*/
|
||||||
|
task_t* get_current_task(void)
|
||||||
|
{
|
||||||
|
return current_task;
|
||||||
|
}
|
||||||
|
|
||||||
|
/** @brief determines the highest priority of the all runable task
|
||||||
|
* @return Highest priority
|
||||||
|
*/
|
||||||
|
uint32_t get_highest_priority(void)
|
||||||
|
{
|
||||||
|
return msb(runqueue.prio_bitmap);
|
||||||
|
}
|
||||||
|
|
||||||
|
int multitasking_init(void)
|
||||||
|
{
|
||||||
|
if (BUILTIN_EXPECT(task_table[0].status != TASK_IDLE, 0)) {
|
||||||
|
kputs("Task 0 is not an idle task\n");
|
||||||
|
return -ENOMEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
task_table[0].prio = IDLE_PRIO;
|
||||||
|
task_table[0].stack = default_stack_pointer - 8192;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
void finish_task_switch(void)
|
||||||
|
{
|
||||||
|
task_t* old;
|
||||||
|
uint8_t prio;
|
||||||
|
|
||||||
|
if ((old = runqueue.old_task) != NULL) {
|
||||||
|
if (old->status == TASK_INVALID) {
|
||||||
|
old->stack = NULL;
|
||||||
|
old->last_stack_pointer = NULL;
|
||||||
|
runqueue.old_task = NULL;
|
||||||
|
} else {
|
||||||
|
prio = old->prio;
|
||||||
|
if (!runqueue.queue[prio-1].first) {
|
||||||
|
old->next = old->prev = NULL;
|
||||||
|
runqueue.queue[prio-1].first = runqueue.queue[prio-1].last = old;
|
||||||
|
} else {
|
||||||
|
old->next = NULL;
|
||||||
|
old->prev = runqueue.queue[prio-1].last;
|
||||||
|
runqueue.queue[prio-1].last->next = old;
|
||||||
|
runqueue.queue[prio-1].last = old;
|
||||||
|
}
|
||||||
|
runqueue.old_task = NULL;
|
||||||
|
runqueue.prio_bitmap |= (1 << prio);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/** @brief A procedure to be called by
|
||||||
|
* procedures which are called by exiting tasks. */
|
||||||
|
static void NORETURN do_exit(int arg)
|
||||||
|
{
|
||||||
|
task_t* curr_task = current_task;
|
||||||
|
|
||||||
|
kprintf("Terminate task: %u, return value %d\n", curr_task->id, arg);
|
||||||
|
|
||||||
|
curr_task->status = TASK_FINISHED;
|
||||||
|
reschedule();
|
||||||
|
|
||||||
|
kprintf("Kernel panic: scheduler found no valid task\n");
|
||||||
|
while(1) {
|
||||||
|
NOP8;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/** @brief A procedure to be called by kernel tasks */
|
||||||
|
void NORETURN leave_kernel_task(void) {
|
||||||
|
int result;
|
||||||
|
|
||||||
|
result = 0; //get_return_value();
|
||||||
|
do_exit(result);
|
||||||
|
}
|
||||||
|
|
||||||
|
/** @brief Create a task with a specific entry point
|
||||||
|
*
|
||||||
|
* @param id Pointer to a tid_t struct were the id shall be set
|
||||||
|
* @param ep Pointer to the function the task shall start with
|
||||||
|
* @param arg Arguments list
|
||||||
|
* @param prio Desired priority of the new task
|
||||||
|
* @param core_id Start the new task on the core with this id
|
||||||
|
*
|
||||||
|
* @return
|
||||||
|
* - 0 on success
|
||||||
|
* - -ENOMEM (-12) or -EINVAL (-22) on failure
|
||||||
|
*/
|
||||||
|
static int create_task(tid_t* id, entry_point_t ep, void* arg, uint8_t prio)
|
||||||
|
{
|
||||||
|
int ret = -ENOMEM;
|
||||||
|
uint32_t i;
|
||||||
|
|
||||||
|
if (BUILTIN_EXPECT(!ep, 0))
|
||||||
|
return -EINVAL;
|
||||||
|
if (BUILTIN_EXPECT(prio == IDLE_PRIO, 0))
|
||||||
|
return -EINVAL;
|
||||||
|
if (BUILTIN_EXPECT(prio > MAX_PRIO, 0))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
for(i=0; i<MAX_TASKS; i++) {
|
||||||
|
if (task_table[i].status == TASK_INVALID) {
|
||||||
|
task_table[i].id = i;
|
||||||
|
task_table[i].status = TASK_READY;
|
||||||
|
task_table[i].last_stack_pointer = NULL;
|
||||||
|
task_table[i].stack = create_stack(i);
|
||||||
|
task_table[i].prio = prio;
|
||||||
|
|
||||||
|
if (id)
|
||||||
|
*id = i;
|
||||||
|
|
||||||
|
ret = create_default_frame(task_table+i, ep, arg);
|
||||||
|
|
||||||
|
// add task in the runqueue
|
||||||
|
runqueue.prio_bitmap |= (1 << prio);
|
||||||
|
runqueue.nr_tasks++;
|
||||||
|
if (!runqueue.queue[prio-1].first) {
|
||||||
|
task_table[i].next = task_table[i].prev = NULL;
|
||||||
|
runqueue.queue[prio-1].first = task_table+i;
|
||||||
|
runqueue.queue[prio-1].last = task_table+i;
|
||||||
|
} else {
|
||||||
|
task_table[i].prev = runqueue.queue[prio-1].last;
|
||||||
|
task_table[i].next = NULL;
|
||||||
|
runqueue.queue[prio-1].last->next = task_table+i;
|
||||||
|
runqueue.queue[prio-1].last = task_table+i;
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
int create_kernel_task(tid_t* id, entry_point_t ep, void* args, uint8_t prio)
|
||||||
|
{
|
||||||
|
if (prio > MAX_PRIO)
|
||||||
|
prio = NORMAL_PRIO;
|
||||||
|
|
||||||
|
return create_task(id, ep, args, prio);
|
||||||
|
}
|
||||||
|
|
||||||
|
size_t** scheduler(void)
|
||||||
|
{
|
||||||
|
task_t* orig_task;
|
||||||
|
task_t* curr_task;
|
||||||
|
uint32_t prio;
|
||||||
|
|
||||||
|
orig_task = curr_task = current_task;
|
||||||
|
|
||||||
|
/* signalizes that this task could be reused */
|
||||||
|
if (curr_task->status == TASK_FINISHED) {
|
||||||
|
curr_task->status = TASK_INVALID;
|
||||||
|
runqueue.old_task = curr_task;
|
||||||
|
} else runqueue.old_task = NULL; // reset old task
|
||||||
|
|
||||||
|
prio = msb(runqueue.prio_bitmap); // determines highest priority
|
||||||
|
if (prio >= sizeof(size_t)*8) {
|
||||||
|
if ((curr_task->status == TASK_RUNNING) || (curr_task->status == TASK_IDLE))
|
||||||
|
goto get_task_out;
|
||||||
|
curr_task = current_task = runqueue.idle;
|
||||||
|
} else {
|
||||||
|
// Does the current task have an higher priority? => no task switch
|
||||||
|
if ((curr_task->prio > prio) && (curr_task->status == TASK_RUNNING))
|
||||||
|
goto get_task_out;
|
||||||
|
|
||||||
|
if (curr_task->status == TASK_RUNNING) {
|
||||||
|
curr_task->status = TASK_READY;
|
||||||
|
runqueue.old_task = curr_task;
|
||||||
|
}
|
||||||
|
|
||||||
|
curr_task = current_task = runqueue.queue[prio-1].first;
|
||||||
|
if (BUILTIN_EXPECT(curr_task->status == TASK_INVALID, 0)) {
|
||||||
|
kprintf("Upps!!!!!!! Got invalid task %d, orig task %d\n", curr_task->id, orig_task->id);
|
||||||
|
}
|
||||||
|
curr_task->status = TASK_RUNNING;
|
||||||
|
|
||||||
|
// remove new task from queue
|
||||||
|
runqueue.queue[prio-1].first = curr_task->next;
|
||||||
|
if (!curr_task->next) {
|
||||||
|
runqueue.queue[prio-1].last = NULL;
|
||||||
|
runqueue.prio_bitmap &= ~(1 << prio);
|
||||||
|
}
|
||||||
|
curr_task->next = curr_task->prev = NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
get_task_out:
|
||||||
|
if (curr_task != orig_task) {
|
||||||
|
//kprintf("schedule from %u to %u with prio %u\n", orig_task->id, curr_task->id, (uint32_t)curr_task->prio);
|
||||||
|
|
||||||
|
return (size_t**) &(orig_task->last_stack_pointer);
|
||||||
|
}
|
||||||
|
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
void reschedule(void)
|
||||||
|
{
|
||||||
|
size_t** stack;
|
||||||
|
if ((stack = scheduler()))
|
||||||
|
switch_context(stack);
|
||||||
|
}
|
||||||
43
mm/memory.c
Normal file
43
mm/memory.c
Normal file
|
|
@ -0,0 +1,43 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions are met:
|
||||||
|
* * Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* * Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* * Neither the name of the University nor the names of its contributors
|
||||||
|
* may be used to endorse or promote products derived from this
|
||||||
|
* software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||||
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||||
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
||||||
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||||
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||||
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||||
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||||
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||||
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <eduos/stddef.h>
|
||||||
|
#include <eduos/stdlib.h>
|
||||||
|
|
||||||
|
static char stack[MAX_TASKS-1][KERNEL_STACK_SIZE];
|
||||||
|
|
||||||
|
void* create_stack(tid_t id)
|
||||||
|
{
|
||||||
|
// idle task uses stack, which is defined in entry.asm
|
||||||
|
if (BUILTIN_EXPECT(!id, 0))
|
||||||
|
return NULL;
|
||||||
|
// do we have a valid task id?
|
||||||
|
if (BUILTIN_EXPECT(id >= MAX_TASKS, 0))
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
return (void*) stack[id-1];
|
||||||
|
}
|
||||||
Loading…
Add table
Reference in a new issue