- add initial version of the SCC bootloader
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@127 315a16e6-25f9-4109-90ae-ca3045a26c18
This commit is contained in:
stefan
parent
3c0a4afd43
commit
b209403ccb
5 changed files with 195 additions and 2 deletions
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@ -1,20 +1,37 @@
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MAKE = make
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CC = gcc
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CROSS_COMPILE=i386-unknown-linux-gnu-gcc
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CFLAGS = -O2 -Wall
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LDFLGAS =
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DEFINES=
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ASM = nasm
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ASMFLAGS = -fbin
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# other implicit rules
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%.o : %.c
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$(CC) -c $(CFLAGS) -o $@ $<
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%.o : %.asm
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$(ASM) $(ASMFLAGS) -o $@ $<
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default:
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$(MAKE) all
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all: make_initrd.o
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all:
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$(MAKE) make_initrd
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make_initrd: make_initrd.o
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$(CC) $(CFLAGS) -o make_initrd $< $(LDFLAGS)
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SCC:
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$(ASM) $(ASMFLAGS) -o scc_entry.bin scc_entry.asm
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cp ../metalsvm.bin .
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chmod a-x *.bin
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. ./prepare.sh
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/home/lankes/tools/bin2obj -m load.map -o metalsvm.obj
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sccMerge -noimage -m 8 -n 12 -force ./metalsvm.mt
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clean:
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$(RM) *.o *~
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$(RM) -rf *.o *~ make_initrd *.bin *.obj obj
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depend:
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$(CC) -MM $(CFLAGS) *.c > Makefile.dep
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2
tools/load.map
Normal file
2
tools/load.map
Normal file
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@ -0,0 +1,2 @@
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0x00100000 metalsvm.bin
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0xfffff000 scc_entry.bin
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2
tools/metalsvm.mt
Normal file
2
tools/metalsvm.mt
Normal file
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@ -0,0 +1,2 @@
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# pid object file
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0x00 ./metalsvm.obj
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11
tools/prepare.sh
Executable file
11
tools/prepare.sh
Executable file
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@ -0,0 +1,11 @@
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#!/bin/sh
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NAME=metalsvm.bin
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SIZE=`ls -ld "$NAME" | awk '{print $5 % 64}'`
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if [ $SIZE -ne 0 ]; then
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echo "$NAME: patching $SIZE Zero-Bytes"
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dd if=/dev/zero of=zero.bin bs=1 count=$SIZE
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cat zero.bin >> $NAME
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else
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echo not patching $NAME
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fi;
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161
tools/scc_entry.asm
Normal file
161
tools/scc_entry.asm
Normal file
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@ -0,0 +1,161 @@
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;
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; Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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; RWTH Aachen University
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;
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; Licensed under the Apache License, Version 2.0 (the "License");
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; you may not use this file except in compliance with the License.
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; You may obtain a copy of the License at
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;
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; http://www.apache.org/licenses/LICENSE-2.0
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;
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; Unless required by applicable law or agreed to in writing, software
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; distributed under the License is distributed on an "AS IS" BASIS,
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; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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; See the License for the specific language governing permissions and
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; limitations under the License.
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;
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; This file is part of metalsvm.
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; This is the kernel's entry point. We could either call main here,
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; or we can use this to setup the stack or other nice stuff, like
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; perhaps setting up the GDT and segments. Please note that interrupts
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; are disabled at this point: More on interrupts later!
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[BITS 16]
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SECTION .text
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GLOBAL _start
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ORG 0
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struc GDT_STR
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s0_15: resw 1
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b0_15: resw 1
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b16_23: resb 1
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flags: resb 1
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access: resb 1
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b24_31: resb 1
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endstruc
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gdt_start dw gdt_size
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gdt_ptr dd 0
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dummy_descriptor: istruc GDT_STR
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at s0_15, dw 0
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at b0_15, dw 0
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at b16_23, db 0
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at flags, db 0
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at access, db 0
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at b24_31, db 0
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iend
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; 4GB 32-bit code , 9ah = 10011010b = Present, DPL 00,No System, Code Exec/Read.
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code32_descriptor: istruc GDT_STR
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at s0_15, dw 0x0ffff
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at b0_15, dw 0
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at b16_23, db 0
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at flags, db 0x9a
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at access, db 0xcf
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at b24_31, db 0
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iend
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; 4GB 32-bit data, 92h = 10010010b = Presetn , DPL 00, No System, Data Read/Write
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data32_descriptor: istruc GDT_STR
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at s0_15, dw 0x0ffff
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at b0_15, dw 0
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at b16_23, db 0
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at flags, db 0x92
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at access, db 0xcf
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at b24_31, db 0
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iend
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gdt_size equ $-(dummy_descriptor)
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msg db "0ello from MetalSVM bootloader!!",0
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enable_A20:
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call a20wait
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mov al,0xAD
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out 0x64,al
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call a20wait
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mov al,0xD0
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out 0x64,al
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call a20wait2
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in al,0x60
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push eax
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call a20wait
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mov al,0xD1
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out 0x64,al
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call a20wait
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pop eax
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or al,2
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out 0x60,al
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call a20wait
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mov al,0xAE
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out 0x64,al
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call a20wait
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ret
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a20wait:
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in al,0x64
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test al,2
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jnz a20wait
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ret
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a20wait2:
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in al,0x64
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test al,1
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jz a20wait2
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ret
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_realstart:
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cli
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cld
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mov [msg], BYTE 'H'
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mov ax, dummy_descriptor
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mov [gdt_ptr], ax
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mov bx, gdt_start
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lgdt [bx]
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; call enable_A20
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; switch to protected mode by setting PE bit
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; we also clear the VM bit
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mov eax, cr0
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or eax, 0x1
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and eax, 0x7FFFFFFF
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mov cr0, eax
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; far jump
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db 0x66 ; Prefix for 32-bit
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db 0xea ; Opcode for far jump
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dd _pmstart ; Offset to start, 32-bit
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dw 0x08 ; This is the selector for CODE32_DESCRIPTOR,
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; assuming that start address resides in this segment
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[BITS 32]
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_pmstart:
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; MetalSVM support Multiboot
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; => Therefore, we switch to the same machine state. Afterwards, we jump to our kernel
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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mov eax, 0x2BAD002
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xor ebx, ebx ; => it exists n valid multiboot information structure
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jmp 0x08 : 0x100000
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TIMES 4080 - ($-$$) DB 0
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[BITS 16]
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_start:
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jmp _realstart
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TIMES 4096 - ($-$$) DB 0
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