cd74257b97
With commit a2ef5c4fd4
"ACPI: Move module parameter gts and bfs to sleep.c" the
wake_sleep_flags is required when calling acpi_enter_sleep_state.
The assembler code in wakeup_*.S did not do that. One solution
is to call it from assembler and stick the wake_sleep_flags on
the stack (for 32-bit) or in %esi (for 64-bit). hpa and rafael
both suggested however to create a wrapper function to call
acpi_enter_sleep_state and call said wrapper function
("acpi_enter_s3") from assembler.
For 32-bit, the acpi_enter_s3 ends up looking as so:
push %ebp
mov %esp,%ebp
sub $0x8,%esp
movzbl 0xc1809314,%eax [wake_sleep_flags]
movl $0x3,(%esp)
mov %eax,0x4(%esp)
call 0xc12d1fa0 <acpi_enter_sleep_state>
leave
ret
And 64-bit:
movzbl 0x9afde1(%rip),%esi [wake_sleep_flags]
push %rbp
mov $0x3,%edi
mov %rsp,%rbp
callq 0xffffffff812e9800 <acpi_enter_sleep_state>
leaveq
retq
Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Suggested-by: H. Peter Anvin <hpa@zytor.com>
[v2: Remove extra assembler operations, per hpa review]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1335150198-21899-3-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
123 lines
2.6 KiB
ArmAsm
123 lines
2.6 KiB
ArmAsm
.text
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/pgtable_types.h>
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#include <asm/page_types.h>
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#include <asm/msr.h>
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#include <asm/asm-offsets.h>
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# Copyright 2003 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
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.code64
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/*
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* Hooray, we are in Long 64-bit mode (but still running in low memory)
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*/
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ENTRY(wakeup_long64)
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movq saved_magic, %rax
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movq $0x123456789abcdef0, %rdx
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cmpq %rdx, %rax
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jne bogus_64_magic
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movw $__KERNEL_DS, %ax
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movw %ax, %ss
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movq saved_rsp, %rsp
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movq saved_rbx, %rbx
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movq saved_rdi, %rdi
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movq saved_rsi, %rsi
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movq saved_rbp, %rbp
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movq saved_rip, %rax
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jmp *%rax
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ENDPROC(wakeup_long64)
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bogus_64_magic:
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jmp bogus_64_magic
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ENTRY(do_suspend_lowlevel)
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subq $8, %rsp
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xorl %eax, %eax
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call save_processor_state
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movq $saved_context, %rax
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movq %rsp, pt_regs_sp(%rax)
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movq %rbp, pt_regs_bp(%rax)
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movq %rsi, pt_regs_si(%rax)
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movq %rdi, pt_regs_di(%rax)
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movq %rbx, pt_regs_bx(%rax)
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movq %rcx, pt_regs_cx(%rax)
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movq %rdx, pt_regs_dx(%rax)
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movq %r8, pt_regs_r8(%rax)
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movq %r9, pt_regs_r9(%rax)
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movq %r10, pt_regs_r10(%rax)
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movq %r11, pt_regs_r11(%rax)
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movq %r12, pt_regs_r12(%rax)
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movq %r13, pt_regs_r13(%rax)
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movq %r14, pt_regs_r14(%rax)
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movq %r15, pt_regs_r15(%rax)
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pushfq
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popq pt_regs_flags(%rax)
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movq $resume_point, saved_rip(%rip)
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movq %rsp, saved_rsp
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movq %rbp, saved_rbp
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movq %rbx, saved_rbx
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movq %rdi, saved_rdi
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movq %rsi, saved_rsi
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addq $8, %rsp
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call acpi_enter_s3
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/* in case something went wrong, restore the machine status and go on */
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jmp resume_point
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.align 4
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resume_point:
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/* We don't restore %rax, it must be 0 anyway */
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movq $saved_context, %rax
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movq saved_context_cr4(%rax), %rbx
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movq %rbx, %cr4
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movq saved_context_cr3(%rax), %rbx
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movq %rbx, %cr3
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movq saved_context_cr2(%rax), %rbx
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movq %rbx, %cr2
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movq saved_context_cr0(%rax), %rbx
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movq %rbx, %cr0
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pushq pt_regs_flags(%rax)
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popfq
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movq pt_regs_sp(%rax), %rsp
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movq pt_regs_bp(%rax), %rbp
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movq pt_regs_si(%rax), %rsi
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movq pt_regs_di(%rax), %rdi
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movq pt_regs_bx(%rax), %rbx
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movq pt_regs_cx(%rax), %rcx
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movq pt_regs_dx(%rax), %rdx
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movq pt_regs_r8(%rax), %r8
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movq pt_regs_r9(%rax), %r9
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movq pt_regs_r10(%rax), %r10
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movq pt_regs_r11(%rax), %r11
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movq pt_regs_r12(%rax), %r12
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movq pt_regs_r13(%rax), %r13
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movq pt_regs_r14(%rax), %r14
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movq pt_regs_r15(%rax), %r15
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xorl %eax, %eax
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addq $8, %rsp
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jmp restore_processor_state
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ENDPROC(do_suspend_lowlevel)
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.data
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ENTRY(saved_rbp) .quad 0
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ENTRY(saved_rsi) .quad 0
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ENTRY(saved_rdi) .quad 0
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ENTRY(saved_rbx) .quad 0
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ENTRY(saved_rip) .quad 0
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ENTRY(saved_rsp) .quad 0
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ENTRY(saved_magic) .quad 0
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