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| author | Jan Beulich <jbeulich@suse.com> | 2012-09-26 11:51:27 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2012-09-26 11:51:27 +0200 |
| commit | 12a287a2e885b8e4f1968b21a56ee76d9bd33eb9 (patch) | |
| tree | a3a1729a5a2c5f3a1f81f738e0efb99e5bf9a96f /xen/common/wait.c | |
| parent | d55c5eefe190e5b0e571b8e9d54616376697ce7e (diff) | |
| download | xen-12a287a2e885b8e4f1968b21a56ee76d9bd33eb9.tar.gz xen-12a287a2e885b8e4f1968b21a56ee76d9bd33eb9.tar.bz2 xen-12a287a2e885b8e4f1968b21a56ee76d9bd33eb9.zip | |
x86: slightly streamline __prepare_to_wait() inline assembly
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/common/wait.c')
| -rw-r--r-- | xen/common/wait.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/xen/common/wait.c b/xen/common/wait.c index aaeabc9bcc..26de48cede 100644 --- a/xen/common/wait.c +++ b/xen/common/wait.c @@ -143,15 +143,13 @@ static void __prepare_to_wait(struct waitqueue_vcpu *wqv) "push %%rax; push %%rbx; push %%rdx; " "push %%rbp; push %%r8; push %%r9; push %%r10; push %%r11; " "push %%r12; push %%r13; push %%r14; push %%r15; call 1f; " - "1: mov %%rsp,%%rsi; addq $2f-1b,(%%rsp); " - "sub %%rsi,%%rcx; cmp %3,%%rcx; jbe 2f; " - "xor %%esi,%%esi; jmp 3f; " - "2: rep movsb; mov %%rsp,%%rsi; 3: pop %%rax; " + "1: addq $2f-1b,(%%rsp); sub %%esp,%%ecx; cmp %3,%%ecx; jbe 3f; " + "mov %%rsp,%%rsi; 2: rep movsb; mov %%rsp,%%rsi; 3: pop %%rax; " "pop %%r15; pop %%r14; pop %%r13; pop %%r12; " "pop %%r11; pop %%r10; pop %%r9; pop %%r8; " "pop %%rbp; pop %%rdx; pop %%rbx; pop %%rax" : "=&S" (wqv->esp), "=&c" (dummy), "=&D" (dummy) - : "i" (PAGE_SIZE), "1" (cpu_info), "2" (wqv->stack) + : "i" (PAGE_SIZE), "0" (0), "1" (cpu_info), "2" (wqv->stack) : "memory" ); if ( unlikely(wqv->esp == 0) ) |