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#include "asm.h"
# Each non-boot CPU ("AP") is started up in response to a STARTUP
# IPI from the boot CPU. Section B.4.2 of the Multi-Processor
# Specification says that the AP will start in real mode with CS:IP
# set to XY00:0000, where XY is an 8-bit value sent with the
# STARTUP. Thus this code must start at a 4096-byte boundary.
# Because this code sets DS to zero, it must sit
# at an address in the low 2^16 bytes.
# Bootothers (in main.c) sends the STARTUPs one at a time.
# It copies this code (start) at 0x7000.
# It puts the address of a newly allocated per-core stack in start-4,
# and the address of the place to jump to (mpmain) in start-8.
# This code is identical to bootasm.S except:
# - it does not need to enable A20
# - it uses the address at start-4 for the %esp
# - it jumps to the address at start-8 instead of calling bootmain
#define SEG_KCODE 1
#define SEG_KDATA 2
#define CR0_PE 1
.globl start
xorw %ax,%ax
movw %ax,%ds
movw %ax,%es
movw %ax,%ss
lgdt gdtdesc
movl %cr0, %eax
orl $CR0_PE, %eax
movl %eax, %cr0
ljmp $(SEG_KCODE<<3), $start32
movw $(SEG_KDATA<<3), %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movw $0, %ax
movw %ax, %fs
movw %ax, %gs
# switch to the stack allocated by bootothers()
movl start-4, %esp
# call mpmain()
call *(start-8)
movw $0x8a00, %ax
movw %ax, %dx
outw %ax, %dx
movw $0x8ae0, %ax
outw %ax, %dx
jmp spin
.p2align 2
SEG_ASM(STA_X|STA_R, 0x0, 0xffffffff)
SEG_ASM(STA_W, 0x0, 0xffffffff)
.word (gdtdesc - gdt - 1)
.long gdt
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