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#include <machine/asm.h>
#include <machine/vm.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
/* set page table feature flags: cr4.PSE on, cr4.PGE off */
movl %cr4, %eax
orl $I386_CR4_PSE, %eax /* Turn on PSE */
andl $~I386_CR4_PGE, %eax /* Turn off PGE */
movl %eax, %cr4
/* load boot cr3 and turn PG on so CPU can see all of memory */
movl _C_LABEL(__ap_pt) - _C_LABEL(trampoline), %eax
movl %eax, %cr3
movl %cr0, %ecx
orl $I386_CR0_PG, %ecx
movl %ecx, %cr0
/* turn on cr4.PGE after cr0.PG is on */
movl %cr4, %eax
orl $I386_CR4_PGE, %eax
movl %eax, %cr4
/* jump into regular highly mapped kernel */
ljmpl $KERN_CS_SELECTOR, $_C_LABEL(startup_ap_32)
.balign 4
LABEL(__ap_id)
.space 4
LABEL(__ap_pt)
.space 4
LABEL(__ap_gdt)
.space 8
LABEL(__ap_idt)
.space 8
LABEL(__ap_gdt_tab)
.space GDT_SIZE*DESC_SIZE
LABEL(__ap_idt_tab)
.space IDT_SIZE*DESC_SIZE
LABEL(__trampoline_end)
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