Author: jkim
Date: Fri Feb 3 21:24:28 2012
New Revision: 230958
URL: http://svn.freebsd.org/changeset/base/230958
Log:
Restore callee saved registers later and micro-optimize.
Modified:
head/sys/amd64/acpica/acpi_switch.S
Modified: head/sys/amd64/acpica/acpi_switch.S
==============================================================================
--- head/sys/amd64/acpica/acpi_switch.S Fri Feb 3 21:21:00 2012
(r230957)
+++ head/sys/amd64/acpica/acpi_switch.S Fri Feb 3 21:24:28 2012
(r230958)
@@ -120,15 +120,6 @@ ENTRY(acpi_restorecpu)
#undef SDT_SYSTSS
#undef SDT_SYSBSY
- /* Restore other callee saved registers. */
- movq PCB_R15(%rdi), %r15
- movq PCB_R14(%rdi), %r14
- movq PCB_R13(%rdi), %r13
- movq PCB_R12(%rdi), %r12
- movq PCB_RBP(%rdi), %rbp
- movq PCB_RSP(%rdi), %rsp
- movq PCB_RBX(%rdi), %rbx
-
/* Restore debug registers. */
movq PCB_DR0(%rdi), %rax
movq %rax, %dr0
@@ -145,6 +136,7 @@ ENTRY(acpi_restorecpu)
/* Restore FPU state. */
fninit
+ movq WAKEUP_CTX(fpusave), %rbx
movq WAKEUP_CTX(xsmask), %rax
testq %rax, %rax
jz 1f
@@ -153,19 +145,26 @@ ENTRY(acpi_restorecpu)
movl $XCR0, %ecx
/* xsetbv */
.byte 0x0f, 0x01, 0xd1
- movq WAKEUP_CTX(fpusave), %rcx
-/* xrstor (%rcx) */
- .byte 0x0f, 0xae, 0x29
+/* xrstor (%rbx) */
+ .byte 0x0f, 0xae, 0x2b
jmp 2f
1:
- movq WAKEUP_CTX(fpusave), %rcx
- fxrstor (%rcx)
+ fxrstor (%rbx)
2:
/* Reload CR0. */
movq PCB_CR0(%rdi), %rax
movq %rax, %cr0
+ /* Restore other callee saved registers. */
+ movq PCB_R15(%rdi), %r15
+ movq PCB_R14(%rdi), %r14
+ movq PCB_R13(%rdi), %r13
+ movq PCB_R12(%rdi), %r12
+ movq PCB_RBP(%rdi), %rbp
+ movq PCB_RSP(%rdi), %rsp
+ movq PCB_RBX(%rdi), %rbx
+
/* Restore return address. */
movq PCB_RIP(%rdi), %rax
movq %rax, (%rsp)
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