kolibrios/kernel/branches/kolibri_pe/boot/start.asm
Sergey Semyonov (Serge) 072729a7f2 move kernel vars into .bss
git-svn-id: svn://kolibrios.org@928 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-11-22 12:57:25 +00:00

137 lines
2.8 KiB
NASM

format MS COFF
include '../macros.inc'
$Revision: 849 $
include "../const.inc"
public __start
extrn high_code
extrn __os_stack
extrn _boot_mbi
extrn _sys_pdbr
extrn _gdts
extrn __edata
section '.start' code readable align 16
use32
align 4
mboot:
dd 0x1BADB002
dd 0x00010003
dd -(0x1BADB002 + 0x00010003)
dd mboot
dd 0x100000
dd __edata; - OS_BASE
dd LAST_PAGE
dd __start
align 16
__start:
cld
mov esp, __os_stack +(0x100000000-OS_BASE)
push 0
popf
cmp eax, 0x2BADB002
mov ecx, sz_invboot
jne .fault
bt dword [ebx], 3
mov ecx, sz_nomods
jnc .fault
bt dword [ebx], 6
mov ecx, sz_nommap
jnc .fault
mov [_boot_mbi+(0x100000000-OS_BASE)], ebx
xor eax, eax
cpuid
cmp eax, 0
mov ecx, sz_nopse
jbe .fault
mov eax, 1
cpuid
bt edx, 3
mov ecx, sz_nopse
jnc .fault
; ENABLE PAGING
mov ecx, 64
mov eax, PG_LARGE+PG_SW
mov edi, _sys_pdbr+(OS_BASE shr 20)+(0x100000000-OS_BASE)
mov [edi-4], dword (PG_LARGE+PG_USER)
@@:
stosd
add eax, 4*1024*1024
loop @B
mov dword [_sys_pdbr+(0x100000000-OS_BASE)], PG_LARGE+PG_SW
mov dword [_sys_pdbr+(0x100000000-OS_BASE)+4], PG_LARGE+PG_SW+4*1024*1024
mov dword [_sys_pdbr+(0x100000000-OS_BASE)+(page_tabs shr 20)], _sys_pdbr+PG_SW+(0x100000000-OS_BASE)
mov ebx, cr4
or ebx, CR4_PSE
and ebx, not CR4_PAE
mov cr4, ebx
mov eax, _sys_pdbr+(0x100000000-OS_BASE)
mov ebx, cr0
or ebx,CR0_PG+CR0_WP
mov cr3, eax
mov cr0, ebx
mov ebx, [_boot_mbi+(0x100000000-OS_BASE)]
mov edx, [ebx+20]
mov esi, [ebx+24]
mov ecx, LAST_PAGE
test edx, edx
jz .no_mods
.scan_mod:
mov ecx, [esi+4]
add esi, 16
dec edx
jnz .scan_mod
.no_mods:
add ecx, 4095
and ecx, not 4095
lgdt [_gdts] ;+(0x100000000-OS_BASE)]
jmp pword 0x10:high_code
.fault:
; push ecx
; call _lcls
; call __bprintf
_hlt:
hlt
jmp _hlt
sz_invboot db 'Invalid multiboot loader magic value',0x0A
db 'Halted',0
sz_nomods db 'No modules loaded',0x0A
db 'Halted',0
sz_nommap db 'No memory table', 0x0A
db 'Halted',0
sz_nopse db 'Page size extensions not supported',0x0A
db 'Halted',0