829 lines
20 KiB
NASM
829 lines
20 KiB
NASM
;
|
|
; Copyright 2010 Stefan Lankes, Chair for Operating Systems,
|
|
; RWTH Aachen University
|
|
;
|
|
; Licensed under the Apache License, Version 2.0 (the "License");
|
|
; you may not use this file except in compliance with the License.
|
|
; You may obtain a copy of the License at
|
|
;
|
|
; http://www.apache.org/licenses/LICENSE-2.0
|
|
;
|
|
; Unless required by applicable law or agreed to in writing, software
|
|
; distributed under the License is distributed on an "AS IS" BASIS,
|
|
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
; See the License for the specific language governing permissions and
|
|
; limitations under the License.
|
|
;
|
|
; This file is part of MetalSVM.
|
|
|
|
; This is the kernel's entry point. We could either call main here,
|
|
; or we can use this to setup the stack or other nice stuff, like
|
|
; perhaps setting up the GDT and segments. Please note that interrupts
|
|
; are disabled at this point: More on interrupts later!
|
|
|
|
%include "config.inc"
|
|
|
|
[BITS 32]
|
|
; We use a special name to map this section at the begin of our kernel
|
|
; => Multiboot needs its magic number at the begin of the kernel
|
|
SECTION .mboot
|
|
global start
|
|
start:
|
|
mov byte [msg], 'H'
|
|
jmp stublet
|
|
|
|
; This part MUST be 4byte aligned, so we solve that issue using 'ALIGN 4'
|
|
ALIGN 4
|
|
mboot:
|
|
; Multiboot macros to make a few lines more readable later
|
|
MULTIBOOT_PAGE_ALIGN equ 1<<0
|
|
MULTIBOOT_MEMORY_INFO equ 1<<1
|
|
; MULTIBOOT_AOUT_KLUDGE equ 1<<16
|
|
MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
|
|
MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO ; | MULTIBOOT_AOUT_KLUDGE
|
|
MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
|
|
EXTERN code, bss, end
|
|
|
|
; This is the GRUB Multiboot header. A boot signature
|
|
dd MULTIBOOT_HEADER_MAGIC
|
|
dd MULTIBOOT_HEADER_FLAGS
|
|
dd MULTIBOOT_CHECKSUM
|
|
|
|
msg db "?ello from MetalSVM kernel!!", 0
|
|
|
|
SECTION .text
|
|
ALIGN 4
|
|
stublet:
|
|
; initialize stack pointer.
|
|
mov esp, boot_stack
|
|
add esp, KERNEL_STACK_SIZE-16
|
|
; save pointer to the multiboot structure
|
|
push ebx
|
|
; initialize cpu features
|
|
call cpu_init
|
|
; interpret multiboot information
|
|
extern multiboot_init
|
|
; pointer to the multiboot structure is already pushed
|
|
call multiboot_init
|
|
add esp, 4
|
|
|
|
; jump to the boot processors's C code
|
|
extern main
|
|
call main
|
|
jmp $ ; infinitive loop
|
|
|
|
global cpu_init
|
|
cpu_init:
|
|
mov eax, cr0
|
|
; enable caching, disable paging and fpu emulation
|
|
and eax, 0x1ffffffb
|
|
; ...and turn on FPU exceptions
|
|
or eax, 0x22
|
|
mov cr0, eax
|
|
; clears the current pgd entry
|
|
xor eax, eax
|
|
mov cr3, eax
|
|
; at this stage, we disable the SSE support
|
|
mov eax, cr4
|
|
and eax, 0xfffbf9ff
|
|
mov cr4, eax
|
|
ret
|
|
|
|
; This will set up our new segment registers. We need to do
|
|
; something special in order to set CS. We do what is called a
|
|
; far jump. A jump that includes a segment as well as an offset.
|
|
; This is declared in C as 'extern void gdt_flush();'
|
|
global gdt_flush
|
|
extern gp
|
|
gdt_flush:
|
|
lgdt [gp]
|
|
mov ax, 0x10
|
|
mov ds, ax
|
|
mov es, ax
|
|
mov fs, ax
|
|
mov gs, ax
|
|
mov ss, ax
|
|
jmp 0x08:flush2
|
|
flush2:
|
|
ret
|
|
|
|
; determines the current instruction pointer (after the jmp)
|
|
global read_ip
|
|
read_ip:
|
|
mov eax, [esp+4]
|
|
pop DWORD [eax] ; Get the return address
|
|
add esp, 4 ; Dirty Hack! read_ip cleanup the stack
|
|
jmp [eax] ; Return. Can't use RET because return
|
|
; address popped off the stack.
|
|
|
|
; In just a few pages in this tutorial, we will add our Interrupt
|
|
; Service Routines (ISRs) right here!
|
|
global isr0
|
|
global isr1
|
|
global isr2
|
|
global isr3
|
|
global isr4
|
|
global isr5
|
|
global isr6
|
|
global isr7
|
|
global isr8
|
|
global isr9
|
|
global isr10
|
|
global isr11
|
|
global isr12
|
|
global isr13
|
|
global isr14
|
|
global isr15
|
|
global isr16
|
|
global isr17
|
|
global isr18
|
|
global isr19
|
|
global isr20
|
|
global isr21
|
|
global isr22
|
|
global isr23
|
|
global isr24
|
|
global isr25
|
|
global isr26
|
|
global isr27
|
|
global isr28
|
|
global isr29
|
|
global isr30
|
|
global isr31
|
|
global isrsyscall
|
|
|
|
; 0: Divide By Zero Exception
|
|
isr0:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 0
|
|
jmp common_stub
|
|
|
|
; 1: Debug Exception
|
|
isr1:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 1
|
|
jmp common_stub
|
|
|
|
; 2: Non Maskable Interrupt Exception
|
|
isr2:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 2
|
|
jmp common_stub
|
|
|
|
; 3: Int 3 Exception
|
|
isr3:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 3
|
|
jmp common_stub
|
|
|
|
; 4: INTO Exception
|
|
isr4:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 4
|
|
jmp common_stub
|
|
|
|
; 5: Out of Bounds Exception
|
|
isr5:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 5
|
|
jmp common_stub
|
|
|
|
; 6: Invalid Opcode Exception
|
|
isr6:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 6
|
|
jmp common_stub
|
|
|
|
; 7: Coprocessor Not Available Exception
|
|
isr7:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 7
|
|
jmp common_stub
|
|
|
|
; 8: Double Fault Exception (With Error Code!)
|
|
isr8:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 8
|
|
jmp common_stub
|
|
|
|
; 9: Coprocessor Segment Overrun Exception
|
|
isr9:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 9
|
|
jmp common_stub
|
|
|
|
; 10: Bad TSS Exception (With Error Code!)
|
|
isr10:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 10
|
|
jmp common_stub
|
|
|
|
; 11: Segment Not Present Exception (With Error Code!)
|
|
isr11:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 11
|
|
jmp common_stub
|
|
|
|
; 12: Stack Fault Exception (With Error Code!)
|
|
isr12:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 12
|
|
jmp common_stub
|
|
|
|
; 13: General Protection Fault Exception (With Error Code!)
|
|
isr13:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 13
|
|
jmp common_stub
|
|
|
|
; 14: Page Fault Exception (With Error Code!)
|
|
isr14:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 14
|
|
jmp common_stub
|
|
|
|
; 15: Reserved Exception
|
|
isr15:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 15
|
|
jmp common_stub
|
|
|
|
; 16: Floating Point Exception
|
|
isr16:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 16
|
|
jmp common_stub
|
|
|
|
; 17: Alignment Check Exception
|
|
isr17:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 17
|
|
jmp common_stub
|
|
|
|
; 18: Machine Check Exception
|
|
isr18:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 18
|
|
jmp common_stub
|
|
|
|
; 19: Reserved
|
|
isr19:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 19
|
|
jmp common_stub
|
|
|
|
; 20: Reserved
|
|
isr20:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 20
|
|
jmp common_stub
|
|
|
|
; 21: Reserved
|
|
isr21:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 21
|
|
jmp common_stub
|
|
|
|
; 22: Reserved
|
|
isr22:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 22
|
|
jmp common_stub
|
|
|
|
; 23: Reserved
|
|
isr23:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 23
|
|
jmp common_stub
|
|
|
|
; 24: Reserved
|
|
isr24:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 24
|
|
jmp common_stub
|
|
|
|
; 25: Reserved
|
|
isr25:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 25
|
|
jmp common_stub
|
|
|
|
; 26: Reserved
|
|
isr26:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 26
|
|
jmp common_stub
|
|
|
|
; 27: Reserved
|
|
isr27:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 27
|
|
jmp common_stub
|
|
|
|
; 28: Reserved
|
|
isr28:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 28
|
|
jmp common_stub
|
|
|
|
; 29: Reserved
|
|
isr29:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 29
|
|
jmp common_stub
|
|
|
|
; 30: Reserved
|
|
isr30:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 30
|
|
jmp common_stub
|
|
|
|
; 31: Reserved
|
|
isr31:
|
|
; isr0 - isr31 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 31
|
|
jmp common_stub
|
|
|
|
extern syscall_handler
|
|
|
|
; used to realize system calls
|
|
; by entering the handler, the interrupt flag is not cleared
|
|
isrsyscall:
|
|
cli
|
|
push es
|
|
push ds
|
|
push ebp
|
|
push edi
|
|
push esi
|
|
push edx
|
|
push ecx
|
|
push ebx
|
|
push eax
|
|
|
|
; set kernel data segmenets
|
|
mov ax, 0x10
|
|
mov ds, ax
|
|
mov es, ax
|
|
mov eax, [esp]
|
|
sti
|
|
|
|
call syscall_handler
|
|
|
|
cli
|
|
add esp, 4 ; eax contains the return value
|
|
; => we did not restore eax
|
|
pop ebx
|
|
pop ecx
|
|
pop edx
|
|
pop esi
|
|
pop edi
|
|
pop ebp
|
|
pop ds
|
|
pop es
|
|
iret
|
|
|
|
global irq0
|
|
global irq1
|
|
global irq2
|
|
global irq3
|
|
global irq4
|
|
global irq5
|
|
global irq6
|
|
global irq7
|
|
global irq8
|
|
global irq9
|
|
global irq10
|
|
global irq11
|
|
global irq12
|
|
global irq13
|
|
global irq14
|
|
global irq15
|
|
global irq16
|
|
global irq17
|
|
global irq18
|
|
global irq19
|
|
global irq20
|
|
global irq21
|
|
global irq22
|
|
global irq23
|
|
global apic_timer
|
|
global apic_lint0
|
|
global apic_lint1
|
|
global apic_error
|
|
global apic_svr
|
|
|
|
; 32: IRQ0
|
|
irq0:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 32
|
|
jmp common_stub
|
|
|
|
; 33: IRQ1
|
|
irq1:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 33
|
|
jmp common_stub
|
|
|
|
; 34: IRQ2
|
|
irq2:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 34
|
|
jmp common_stub
|
|
|
|
; 35: IRQ3
|
|
irq3:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 35
|
|
jmp common_stub
|
|
|
|
; 36: IRQ4
|
|
irq4:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 36
|
|
jmp common_stub
|
|
|
|
; 37: IRQ5
|
|
irq5:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 37
|
|
jmp common_stub
|
|
|
|
; 38: IRQ6
|
|
irq6:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 38
|
|
jmp common_stub
|
|
|
|
; 39: IRQ7
|
|
irq7:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 39
|
|
jmp common_stub
|
|
|
|
; 40: IRQ8
|
|
irq8:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 40
|
|
jmp common_stub
|
|
|
|
; 41: IRQ9
|
|
irq9:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 41
|
|
jmp common_stub
|
|
|
|
; 42: IRQ10
|
|
irq10:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 42
|
|
jmp common_stub
|
|
|
|
; 43: IRQ11
|
|
irq11:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 43
|
|
jmp common_stub
|
|
|
|
; 44: IRQ12
|
|
irq12:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 44
|
|
jmp common_stub
|
|
|
|
; 45: IRQ13
|
|
irq13:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 45
|
|
jmp common_stub
|
|
|
|
; 46: IRQ14
|
|
irq14:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 46
|
|
jmp common_stub
|
|
|
|
; 47: IRQ15
|
|
irq15:
|
|
; irq0 - irq15 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 47
|
|
jmp common_stub
|
|
|
|
; 48: IRQ16
|
|
irq16:
|
|
; irq16 - irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 48
|
|
jmp common_stub
|
|
|
|
; 49: IRQ17
|
|
irq17:
|
|
; irq16- irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 49
|
|
jmp common_stub
|
|
|
|
; 50: IRQ18
|
|
irq18:
|
|
; irq16 - irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 50
|
|
jmp common_stub
|
|
|
|
; 51: IRQ19
|
|
irq19:
|
|
; irq16 - irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 51
|
|
jmp common_stub
|
|
|
|
; 52: IRQ20
|
|
irq20:
|
|
; irq16- irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 52
|
|
jmp common_stub
|
|
|
|
; 53: IRQ21
|
|
irq21:
|
|
; irq16 - irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; error code
|
|
push byte 53
|
|
jmp common_stub
|
|
|
|
; 54: IRQ22
|
|
irq22:
|
|
; irq16- irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 54
|
|
jmp common_stub
|
|
|
|
; 55: IRQ23
|
|
irq23:
|
|
; irq16 - irq23 are registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 55
|
|
jmp common_stub
|
|
|
|
apic_timer:
|
|
; apic timer is registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 123
|
|
jmp common_stub
|
|
|
|
apic_lint0:
|
|
; lint0 is registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 124
|
|
jmp common_stub
|
|
|
|
apic_lint1:
|
|
; lint1 is registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 125
|
|
jmp common_stub
|
|
|
|
apic_error:
|
|
; LVT error interrupt is registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 126
|
|
jmp common_stub
|
|
|
|
apic_svr:
|
|
; SVR is registered as "Interrupt Gate"
|
|
; Therefore, the interrupt flag (IF) is already cleared.
|
|
; cli
|
|
push byte 0 ; pseudo error code
|
|
push byte 127
|
|
jmp common_stub
|
|
|
|
extern irq_handler
|
|
extern get_current_stack
|
|
extern finish_task_switch
|
|
|
|
global switch_context
|
|
ALIGN 4
|
|
switch_context:
|
|
; create on the stack a pseudo interrupt
|
|
; afterwards, we switch to the task with iret
|
|
; we already in kernel space => no pushing of SS required
|
|
mov eax, [esp+4] ; on the stack is already the address to store the old esp
|
|
pushf ; EFLAGS
|
|
push DWORD 0x8 ; CS
|
|
push DWORD rollback ; EIP
|
|
push DWORD 0x0 ; Interrupt number
|
|
push DWORD 0x00edbabe ; Error code
|
|
pusha ; Registers...
|
|
push 0x10 ; kernel data segment
|
|
push 0x10 ; kernel data segment
|
|
|
|
jmp common_switch
|
|
|
|
ALIGN 4
|
|
rollback:
|
|
ret
|
|
|
|
ALIGN 4
|
|
common_stub:
|
|
pusha
|
|
push es
|
|
push ds
|
|
mov ax, 0x10
|
|
mov es, ax
|
|
mov ds, ax
|
|
|
|
; use the same handler for interrupts and exceptions
|
|
push esp
|
|
call irq_handler
|
|
add esp, 4
|
|
|
|
cmp eax, 0
|
|
je no_context_switch
|
|
|
|
common_switch:
|
|
mov [eax], esp ; store old esp
|
|
call get_current_stack ; get new esp
|
|
xchg eax, esp
|
|
|
|
; set task switched flag
|
|
mov eax, cr0
|
|
or eax, 8
|
|
mov cr0, eax
|
|
|
|
; call cleanup code
|
|
call finish_task_switch
|
|
|
|
no_context_switch:
|
|
pop ds
|
|
pop es
|
|
popa
|
|
add esp, 8
|
|
iret
|
|
|
|
SECTION .data
|
|
global boot_stack
|
|
ALIGN 4096
|
|
boot_stack:
|
|
TIMES (MAX_CORES*KERNEL_STACK_SIZE) DB 0xcd
|
|
|
|
SECTION .note.GNU-stack noalloc noexec nowrite progbits
|