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