reactos/hal/halx86/mp/mpsboot.asm

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;
; COPYRIGHT: See COPYING in the top level directory
; PROJECT: ReactOS kernel
; FILE: hal/halx86/mp/mpsboot.c
; PURPOSE: Bootstrap code for application processors
; PROGRAMMER: Casper S. Hornstrup (chorns@users.sourceforge.net)
; UPDATE HISTORY:
; Created 12/04/2001
;
;
; Memory map at this stage is:
; 0x2000 Location of our stack
; 0x3000 Startup code for the APs (this code)
;
;
; Magic value to be put in EAX when multiboot.S is called as part of the
; application processor initialization process
;
AP_MAGIC equ 12481020h
X86_CR4_PAE equ 00000020h
;
; Segment selectors
;
%define KERNEL_CS (0x8)
%define KERNEL_DS (0x10)
section .text
global _APstart
global _APend
; 16 bit code
BITS 16
_APstart:
cli ; Just in case
xor ax, ax
mov ds, ax
mov ss, ax
mov eax, 3000h + APgdt - _APstart
lgdt [eax]
mov eax, [2004h] ; Set the page directory
mov cr3, eax
mov eax, [200ch]
cmp eax,0
je NoPae
mov eax,cr4
or eax,X86_CR4_PAE
mov cr4,eax
NoPae:
mov eax, cr0
or eax, 80010001h ; Turn on protected mode, paging and write protection
mov cr0, eax
db 0eah
dw 3000h + flush - _APstart, KERNEL_CS
; 32 bit code
BITS 32
flush:
mov ax, KERNEL_DS
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
; Setup a stack for the AP
mov eax, 2000h
mov eax, [eax]
mov esp, eax
; Jump to start of the kernel with AP magic in ecx
mov ecx, AP_MAGIC
mov eax,[2008h]
jmp eax
; Never get here
; Temporary GDT descriptor for the APs
APgdt:
; Limit
dw (3*8)-1
; Base
dd 3000h + gdt - _APstart
gdt:
dw 0x0 ; Null descriptor
dw 0x0
dw 0x0
dw 0x0
dw 0xffff ; Kernel code descriptor
dw 0x0000
dw 0x9a00
dw 0x00cf
dw 0xffff ; Kernel data descriptor
dw 0x0000
dw 0x9200
dw 0x00cf
_APend: