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