[SeaBIOS] [PATCH] Don't try to talk to APIC on 486
Lubomir Rintel
lkundrak at v3.sk
Fri Aug 20 13:37:54 CEST 2010
It only has one cpuid level, therefore it can't report whether it
has an APIC. It probably hasn't; assume that. Without this,
SeaBIOS would get stuck on qemu -M isapc.
Signed-off-by: Lubomir Rintel <lkundrak at v3.sk>
---
src/smp.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/src/smp.c b/src/smp.c
index f989ec1..38e117e 100644
--- a/src/smp.c
+++ b/src/smp.c
@@ -72,7 +72,7 @@ smp_probe(void)
ASSERT32FLAT();
u32 eax, ebx, ecx, cpuid_features;
cpuid(1, &eax, &ebx, &ecx, &cpuid_features);
- if (! (cpuid_features & CPUID_APIC)) {
+ if (eax < 1 || !(cpuid_features & CPUID_APIC)) {
// No apic - only the main cpu is present.
dprintf(1, "No apic - only the main cpu is present.\n");
CountCPUs= 1;
--
1.7.2.1
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