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ENTRY(trampoline_data) r_base = . wbinvd # Needed for NUMA-Q should be harmless for others mov %cs, %ax # Code and data in the same place mov %ax, %ds cli # We should be safe anyway movl $0xA5A5A5A5, trampoline_data - r_base # write marker for master knows we're running /* GDT tables in non default location kernel can be beyond 16MB and * lgdt will not be able to load the address as in real mode default * operand size is 16bit. Use lgdtl instead to force operand size * to 32 bit. */ lidtl boot_idt_descr - r_base # load idt with 0, 0 lgdtl boot_gdt_descr - r_base # load gdt with whatever is appropriate xor %ax, %ax inc %ax # protected mode (PE) bit lmsw %ax # into protected mode # flush prefetch and jump to startup_32_smp in arch/i386/kernel/head.S ljmpl $__BOOT_CS, $(startup_32_smp-__PAGE_OFFSET) # These need to be in the same 64K segment as the above; # hence we don't use the boot_gdt_descr defined in head.S boot_gdt_descr: .word __BOOT_DS + 7 # gdt limit .long boot_gdt - __PAGE_OFFSET # gdt base boot_idt_descr: .word 0 # idt limit = 0 .long 0 # idt base = 0L .globl trampoline_end trampoline_end: |
