150 lines
2.6 KiB
ArmAsm
150 lines
2.6 KiB
ArmAsm
/*
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* ACPI wakeup real mode startup stub
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*/
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#include <asm/segment.h>
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#include <asm/msr-index.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor-flags.h>
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.code16
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.section ".header", "a"
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/* This should match the structure in wakeup.h */
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.globl wakeup_header
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wakeup_header:
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video_mode: .short 0 /* Video mode number */
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pmode_return: .byte 0x66, 0xea /* ljmpl */
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.long 0 /* offset goes here */
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.short __KERNEL_CS
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pmode_cr0: .long 0 /* Saved %cr0 */
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pmode_cr3: .long 0 /* Saved %cr3 */
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pmode_cr4: .long 0 /* Saved %cr4 */
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pmode_efer: .quad 0 /* Saved EFER */
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pmode_gdt: .quad 0
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realmode_flags: .long 0
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real_magic: .long 0
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trampoline_segment: .word 0
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_pad1: .byte 0
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wakeup_jmp: .byte 0xea /* ljmpw */
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wakeup_jmp_off: .word 3f
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wakeup_jmp_seg: .word 0
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wakeup_gdt: .quad 0, 0, 0
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signature: .long 0x51ee1111
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.text
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.globl _start
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.code16
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wakeup_code:
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_start:
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cli
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cld
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/* Apparently some dimwit BIOS programmers don't know how to
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program a PM to RM transition, and we might end up here with
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junk in the data segment descriptor registers. The only way
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to repair that is to go into PM and fix it ourselves... */
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movw $16, %cx
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lgdtl %cs:wakeup_gdt
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movl %cr0, %eax
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orb $X86_CR0_PE, %al
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movl %eax, %cr0
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jmp 1f
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1: ljmpw $8, $2f
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2:
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movw %cx, %ds
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movw %cx, %es
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movw %cx, %ss
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movw %cx, %fs
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movw %cx, %gs
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andb $~X86_CR0_PE, %al
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movl %eax, %cr0
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jmp wakeup_jmp
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3:
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/* Set up segments */
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movw %cs, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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lidtl wakeup_idt
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movl $wakeup_stack_end, %esp
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/* Clear the EFLAGS */
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pushl $0
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popfl
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/* Check header signature... */
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movl signature, %eax
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cmpl $0x51ee1111, %eax
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jne bogus_real_magic
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/* Check we really have everything... */
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movl end_signature, %eax
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cmpl $0x65a22c82, %eax
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jne bogus_real_magic
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/* Call the C code */
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calll main
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/* Do any other stuff... */
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#ifndef CONFIG_64BIT
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/* This could also be done in C code... */
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movl pmode_cr3, %eax
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movl %eax, %cr3
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movl pmode_cr4, %ecx
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jecxz 1f
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movl %ecx, %cr4
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1:
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movl pmode_efer, %eax
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movl pmode_efer + 4, %edx
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movl %eax, %ecx
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orl %edx, %ecx
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jz 1f
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movl $0xc0000080, %ecx
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wrmsr
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1:
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lgdtl pmode_gdt
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/* This really couldn't... */
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movl pmode_cr0, %eax
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movl %eax, %cr0
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jmp pmode_return
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#else
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pushw $0
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pushw trampoline_segment
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pushw $0
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lret
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#endif
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bogus_real_magic:
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1:
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hlt
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jmp 1b
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.data
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.balign 8
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/* This is the standard real-mode IDT */
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wakeup_idt:
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.word 0xffff /* limit */
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.long 0 /* address */
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.word 0
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.globl HEAP, heap_end
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HEAP:
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.long wakeup_heap
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heap_end:
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.long wakeup_stack
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.bss
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wakeup_heap:
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.space 2048
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wakeup_stack:
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.space 2048
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wakeup_stack_end:
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