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