a42ab504a0
- the 16-bit trampoline must be within the first megabyte of physical memory thus the smp trampoline is copied explicitly below 1M
32 lines
561 B
ArmAsm
32 lines
561 B
ArmAsm
#include <machine/asm.h>
|
|
#include "archconst.h"
|
|
|
|
.balign 4096
|
|
.text
|
|
.code16
|
|
ENTRY(trampoline)
|
|
cli
|
|
|
|
/* %cs has some value and we must use the same for data */
|
|
mov %cs, %ax
|
|
mov %ax, %ds
|
|
|
|
/* load gdt and idt prepared by bsp */
|
|
lgdtl _C_LABEL(__ap_gdt) - _C_LABEL(trampoline)
|
|
lidtl _C_LABEL(__ap_idt) - _C_LABEL(trampoline)
|
|
|
|
/* switch to protected mode */
|
|
mov %cr0, %eax
|
|
orb $1, %al
|
|
mov %eax, %cr0
|
|
|
|
ljmp $CS_SELECTOR, $_C_LABEL(startup_ap_32)
|
|
|
|
.balign 4
|
|
LABEL(__ap_id)
|
|
.space 4
|
|
LABEL(__ap_gdt)
|
|
.space 8
|
|
LABEL(__ap_idt)
|
|
.space 8
|
|
LABEL(__trampoline_end)
|