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kvmvapic: Simplify mp/up_set_tpr 

The CH registers is only written, never read. So we can remove these
operations and, in case of up_set_tpr, also the ECX push/pop.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2012-02-17 18:31:20 +01:00 committed by Avi Kivity
parent e5ad936b0f
commit 1189aa519c
1 changed files with 1 additions and 5 deletions
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6
pc-bios/optionrom/kvmvapic.S
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@ -202,7 +202,6 @@ mp_isr_is_bigger:
mov %bh, %bl
mp_tpr_is_bigger:
/* %bl = ppr */
mov %bl, %ch /* ch = ppr */
rol $8, %ebx
/* now: %bl = irr, %bh = ppr */
cmp %bh, %bl
@ -276,7 +275,6 @@ up_set_tpr_eax:
up_set_tpr:
pushf
push %eax
push %ecx
push %ebx
reenable_vtpr
@ -284,7 +282,7 @@ up_set_tpr_failed:
mov vapic, %eax ; fixup
mov %eax, %ebx
mov 20(%esp), %bl
mov 16(%esp), %bl
/* %ebx = new vapic (%bl = tpr, %bh = isr, %b3 = irr) */
@ -298,7 +296,6 @@ up_isr_is_bigger:
mov %bh, %bl
up_tpr_is_bigger:
/* %bl = ppr */
mov %bl, %ch /* ch = ppr */
rol $8, %ebx
/* now: %bl = irr, %bh = ppr */
cmp %bh, %bl
@ -306,7 +303,6 @@ up_tpr_is_bigger:
up_set_tpr_out:
pop %ebx
pop %ecx
pop %eax
popf
ret $4