Dmitry Mikushin <dmi...@kernelgen.org> writes:
>
> So, it seems ia32 emulation assumes Pentium II+. Do you see a quick
> way to make it Pentium I -compatible?
The SYSENTER code path should be never executed, so you could either hack the
assembler to allow it, or just open code it.
Something like (totally untested):
From: Andi Kleen <a...@linux.intel.com>
use .byte to implement SYSEXIT for k1om assembler
diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
index bba3cf8..1ad2378 100644
--- a/arch/x86/include/asm/irqflags.h
+++ b/arch/x86/include/asm/irqflags.h
@@ -130,6 +130,8 @@ static inline notrace unsigned long
arch_local_irq_save(void)
#define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */
#define INTERRUPT_RETURN iretq
+#define SYSEXIT .byte 0x0f,0x35
+
#define USERGS_SYSRET64 \
swapgs; \
sysretq;
@@ -139,7 +141,7 @@ static inline notrace unsigned long
arch_local_irq_save(void)
#define ENABLE_INTERRUPTS_SYSEXIT32 \
swapgs; \
sti; \
- sysexit
+ SYSEXIT
#else
#define INTERRUPT_RETURN iret
--
a...@linux.intel.com -- Speaking for myself only
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