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.kis...@siemens.com>
---
pc-bios/optionrom/kvmvapic.S | 6 +-----
1 files changed, 1 insertions(+), 5 deletions(-)
diff --git a/pc-bios/optionrom/kvmvapic.S b/pc-bios/optionrom/kvmvapic.S
index e1d8f18..856c1e5 100644
--- a/pc-bios/optionrom/kvmvapic.S
+++ b/pc-bios/optionrom/kvmvapic.S
@@ -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
--
1.7.3.4
--
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