- Clear cr0.ts
- Enable cr4.osxsave and cr4.osxmmexcpt (for sse)
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
lib/x86/smp.c | 9 +++++++++
x86/cstart.S | 2 ++
x86/cstart64.S | 2 ++
3 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/lib/x86/smp.c b/lib/x86/smp.c
index d41c332..5e91f1a 100644
--- a/lib/x86/smp.c
+++ b/lib/x86/smp.c
@@ -3,6 +3,7 @@
#include "smp.h"
#include "apic.h"
#include "fwcfg.h"
+#include "processor.h"
#define IPI_VECTOR 0x20
@@ -124,6 +125,14 @@ void on_cpu_async(int cpu, void (*function)(void *data), void *data)
__on_cpu(cpu, function, data, 0);
}
+void __setup_cpu(void *data)
+{
+ write_cr4(read_cr4()
+ | 0x200 /* OSFXSR; for SSE */
+ | 0x400 /* OSXMMEXCPT, ditto */
+ );
+ asm volatile ("clts");
+}
void smp_init(void)
{
diff --git a/x86/cstart.S b/x86/cstart.S
index bc8d563..36ad01f 100644
--- a/x86/cstart.S
+++ b/x86/cstart.S
@@ -121,6 +121,7 @@ ap_start32:
sti
nop
lock incw cpu_online_count
+ call __setup_cpu
1: hlt
jmp 1b
@@ -172,6 +173,7 @@ smp_init:
1: pause
cmpw %ax, cpu_online_count
jne 1b
+ call __setup_cpu
smp_init_done:
ret
diff --git a/x86/cstart64.S b/x86/cstart64.S
index 71014d8..7d88dc5 100644
--- a/x86/cstart64.S
+++ b/x86/cstart64.S
@@ -170,6 +170,7 @@ ap_start64:
call load_tss
call enable_apic
call enable_x2apic
+ call __setup_cpu
sti
nop
lock incw cpu_online_count
@@ -234,6 +235,7 @@ smp_init:
1: pause
cmpw %ax, cpu_online_count
jne 1b
+ call __setup_cpu
smp_init_done:
ret
--
1.7.5.3
--
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