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01FC/2 ALL root_dev Default root device number<br>
01FE/2 ALL boot_flag 0xAA55 magic number<br>
*/<br>
.org 497<br>
setup_sects:<br>
.byte SETUPSECS<br>
root_flags:<br>
.word CONFIG_ROOT_RDONLY<br>
syssize:<br>
.word SYSSIZE<br>
swap_dev:<br>
.word SWAP_DEV<br>
ram_size:<br>
.word RAMDISK<br>
vid_mode:<br>
.word SVGA_MODE<br>
root_dev:<br>
.word ROOT_DEV<br>
boot_flag:<br>
.word 0xAA55<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
// end of file<br>
<br>
<br>
<br>
<br>
[这个贴子最后由e4gle在 2002/08/25 06:30pm 编辑]<br>
<br>
////////////////////////////////////////////////////////////////////<br>
// head.txt<br>
// Copyright(C) 2001, Feiyun Wang<br>
////////////////////////////////////////////////////////////////////<br>
// analysis on linux/arch/i386/kernel/head.S (for linux 2.2.17)<br>
////////////////////////////////////////////////////////////////////<br>
<br>
////////////////////////////////////////////////////////////////////<br>
startup_32()<br>
__KERNEL_DS = 0x18;<br>
CL_MAGIC = 0xA33F;<br>
CL_MAGIC_ADDR = 0x90020;<br>
CL_BASE_ADDR = 0x90000;<br>
CL_OFFSET = 0x90022;<br>
{<br>
cld;<br>
DS = ES = FS = GS = __KERNEL_DS (= 0x18);<br>
<br>
#ifdef __SMP__<br>
if (BX) {<br>
CR4 |= mmu_cr4_features-__PAGE_OFFSET;<br>
// mmu_cr4_features defined in arch/i386/mm/init.c<br>
// __PAGE_OFFSET defined in include/asm-i386/page.h<br>
}<br>
#endif<br>
<br>
CR3 = 0x101000;// page table pointer<br>
CR0 |= 0x80000000;// set PG bit<br>
<br>
SS:ESP = stack_start;<br>
<br>
#ifdef __SMP__<br>
if (BX) {<br>
EFLAG = 0;<br>
goto checkCPUtype;<br>
}<br>
#endif<br>
<br>
clear BSS (__bss_start .. _end);<br>
setup_idt();<br>
EFLAGS = 0;<br>
move 0x90000 to empty_zero_page (i.e. 0x5000) (2 KByte);<br>
clear empty_zero_page+2K (2 KByte);<br>
<br>
if (CL_MAGIC==*(CL_MAGIC_ADDR)) {<br>
move *(CL_OFFSET)+CL_BASE_ADDR to empty_zero_page+2K (2 KByte);<br>
}<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
checkCPUtype()<br>
global variables: ready<br>
// see include/asm-i386/processor.h struct cpuinfo_x86<br>
// boot_cpu_data defined in arch/i386/kernel/setup.c<br>
struct cpuinfo_x86 boot_cpu_data;<br>
__KERNEL_DS = 0x18;<br>
{<br>
X86_CPUID = -1;<br>
<br>
X86 = 3;<br>
save original EFLAGS;<br>
check AC bit in EFLAGS;<br>
if (AC bit not changed) goto is386;<br>
<br>
X86 = 4;<br>
check ID bit in EFLAGS;<br>
restore original EFLAGS;<br>
if (ID bit not changed) goto is486;<br>
<br>
// get CPU info,<br>
// <> Vol.2 P.3-110<br>
CPUID(EAX=0);<br>
X86_CPUID = EAX;<br>
X86_VENDOR_ID = EBX;<br>
*((&X86_VENDOR_ID)+4) = ECX;<br>
*((&X86_VENDOR_ID)+8) = EDX;<br>
if (!EAX) goto is486;<br>
<br>
CPUID(EAX=1);<br>
CL = AL;<br>
X86 = AH & 0x0f;// family<br>
X86_MODEL = (AL & 0xf0) >> 4;// model<br>
X86_MASK = AL & 0x0f;// stepping id<br>
X86_CAPABILITY = EDX;// feature<br>
<br>
is486:<br>
// save PG, PE & ET, set AM, WP, NE & MP<br>
EAX = (CR0 & 0x80000011) | 0x50022;<br>
goto 2f;<br>
is386:<br>
restore original EFLAGS;<br>
// save PG, PE & ET, set MP<br>
EAX = (CR0 & 0x80000011) | 0x02;<br>
2f:<br>
CR0 = EAX;<br>
check_x87();<br>
<br>
#ifdef __SMP__<br>
if (ready) {<br>
CR4 |= 0x10;// set PSE, turn on 4 MByte pages<br>
CR3 = CR3;<br>
}<br>
ready++;<br>
#endif;<br>
<br>
lgdt gdt_descr;<br>
lidt idt_descr;<br>
DS = ES = FS = GS = __KERNEL_DS (= 0x18);<br>
<br>
#ifdef __SMP__<br>
SS = __KERNEL_DS (= 0x18);<br>
#else<br>
SS:ESP = stack_start;<br>
#endif<br>
<br>
lldt 0;<br>
cld;<br>
start_kernel();<br>
halt;<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
{<br>
#ifdef __SMP__<br>
ready:.byte 0;<br>
#endif<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
check_x87()<br>
{<br>
X86_HARD_MATH = 0;<br>
clts;<br>
fninit;<br>
fstsw ax;<br>
if (al) {<br>
// no coprocessor, set EM;<br>
// TODO; why not use |=?<br>
cr0 ^= 0x04;<br>
}<br>
else {<br>
X86_HARD_MATH = 1;<br>
fsetpm;// 0xDB, 0xE4<br>
}<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
setup_idt()<br>
{<br>
edx = &ignore_int;<br>
eax = __KERNEL_CS << 16;<br>
ax = dx;<br>
dx = 0x8E00;// interrupt gate, dpl = 0, present<br>
<br>
set all entries in idt_table to eax:edx;// 256*8 Bytes<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
{<br>
stack_start:<br>
.long init_task_union+8192;<br>
.long __KERNEL_DS;<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
ignore_init()<br>
{<br>
printk("Unknown interrupt");<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
{<br>
NR_TASKS = 512;// defined in include/linux/tasks.h<br>
IDT_ENTRIES = 256;<br>
GDT_ENTRIES = 12+2*NR_TASKS;<br>
<br>
.word 0;<br>
idt_descr:<br>
.word IDT_ENTRIES*8-1;<br>
idt:<br>
.long idt_table;<br>
<br>
.word 0;<br>
gdt_descr:<br>
.word GDT_ENTRIES*8-1;<br>
gdt:<br>
.long gdt_table;<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
{<br>
.org 0x1000;<br>
swapper_pg_dir:<br>
.long 0x00102007;<br>
.fill __USER_PGD_PTRS-1, 4, 0;// 767 entries<br>
.long 0x00102007;<br>
.fill __KERNEL_PGD_PTRS-1, 4, 0;// 255 entries<br>
<br>
.org 0x2000;<br>
pg0:<br>
// ...<br>
<br>
.org 0x3000;<br>
empty_bad_page:<br>
<br>
.org 0x4000;<br>
empty_bad_page_table:<br>
<br>
.org 0x5000;<br>
empty_zero_page:<br>
<br>
.org 0x6000;<br>
.data<br>
gdt_table:<br>
.quad 0x0000000000000000;// null<br>
.quad 0x0000000000000000;// not used<br>
.quad 0x00cf9a000000ffff;// 0x10 kernel 4GB code at 0x00000000<br>
.quad 0x00cf92000000ffff;// 0x18 kernel 4GB data at 0x00000000<br>
.quad 0x00cffa000000ffff;// 0x20 user 4GB code at 0x00000000<br>
.quad 0x00cff2000000ffff;// 0x28 user 4GB data at 0x00000000<br>
.quad 0x0000000000000000;// not used<br>
.quad 0x0000000000000000;// not used<br>
<br>
.quad 0x0040920000000000;// 0x40 APM setup for bad BIOS<br>
.quad 0x00409a0000000000;// 0x48 APM CS code<br>
.quad 0x00009a0000000000;// 0x50 APM CS 16 code (16 bit)<br>
.quad 0x0040920000000000;// 0x58 APM DS data<br>
.fill 2*NR_TASKS, 8, 0;<br>
<br>
.section .text.lock<br>
stext_lock:<br>
}<br>
<br>
////////////////////////////////////////////////////////////////////<br>
// end of file<br>
<br>
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