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As acpi_enter_sleep_state can fail, take this into account in do_suspend_lowlevel and don't return to the do_suspend_lowlevel's caller. This would break (currently) fpu status and preempt count. Technically, this means use `call' instead of `jmp' and `jmp' to the `resume_point' after the `call' (i.e. if acpi_enter_sleep_state returns=fails). `resume_point' will handle the restore of fpu and preempt count gracefully. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
125 lines
2.6 KiB
ArmAsm
125 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.h>
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#include <asm/page.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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movl $3, %edi
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xorl %eax, %eax
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call acpi_enter_sleep_state
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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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