mirror of
https://github.com/reactos/reactos.git
synced 2024-08-20 02:13:29 +00:00
119 lines
1.9 KiB
NASM
119 lines
1.9 KiB
NASM
;
|
|
; 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:
|