- add bootloader for Rock Creek
git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@143 315a16e6-25f9-4109-90ae-ca3045a26c18
This commit is contained in:
stefan
parent
b209403ccb
commit
e482442e36
5 changed files with 69 additions and 44 deletions
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@ -10,8 +10,6 @@ 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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@ -22,8 +20,13 @@ all:
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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) $(ASMFLAGS) -o scc_entry.bin scc_entry.asm
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scc_setup.bin: scc_setup.asm
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$(ASM) $(ASMFLAGS) -o $@ $<
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reset_vector.bin: reset_vector.o
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ld --oformat binary -Ttext 0 -melf_i386 -o $@ $<
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SCC: scc_setup.bin reset_vector.bin
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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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@ -1,2 +1,3 @@
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0x00090200 scc_setup.bin
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0x00100000 metalsvm.bin
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0xfffff000 scc_entry.bin
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0xfffff000 reset_vector.bin
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@ -1,2 +1,2 @@
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# pid object file
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0x00 ./metalsvm.obj
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# pid mch-route mch-dest-id mch-offset-base testcase
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0x00 0x00 6 0x00 metalsvm.obj
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39
tools/reset_vector.S
Normal file
39
tools/reset_vector.S
Normal file
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@ -0,0 +1,39 @@
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/*
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* QEMU Boot sector to launch a preloaded Linux kernel
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* Copyright (c) 2004 Fabrice Bellard
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*/
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#define LOAD_SEG 0x9000
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// define CONFIG_MCEMU_DEBUG 1
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.code16
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.text
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.globl _start
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.org 0x0000
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.ascii "MetalSVM Boot sector"
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_realstart:
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#ifdef CONFIG_MCEMU_DEBUG
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movl $27, %eax
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movw $0xff8, %dx
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outl %eax, %dx
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movl $0x0010, %eax
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movw $0xffc, %dx
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outl %eax, %dx
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#endif
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cli
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cld
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mov $LOAD_SEG, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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mov %ax, %ss
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mov $0x8ffe, %sp
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ljmp $LOAD_SEG + 0x20, $0
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.org 0x0ff0
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_start:
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jmp _realstart
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_end:
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.fill 4096 - _end, 1, 0
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@ -16,15 +16,18 @@
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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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; This is the kernel's entry point. We switch to the protected mode
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; and jump to our kernel.
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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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ORG 0x90200
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_start:
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jmp _realstart
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msg db "Hello from MetalSVM bootloader!!",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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@ -35,8 +38,8 @@ ORG 0
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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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gdt_ptr dd dummy_descriptor
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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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@ -56,7 +59,7 @@ ORG 0
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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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; 4GB 32-bit data, 92h = 10010010b = Present, 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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@ -66,8 +69,7 @@ ORG 0
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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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gdt_size equ $ - (dummy_descriptor) - 1
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enable_A20:
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call a20wait
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@ -111,37 +113,23 @@ 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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lgdt [gdt_start]
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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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or al, 0x1
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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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; far jump to the 32bit code
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jmp dword 0x08 : _pmstart
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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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xor eax, eax
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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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@ -149,13 +137,7 @@ _pmstart:
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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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xor ebx, ebx ; => it exists no 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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TIMES 4096-($-$$) DB 0
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