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Message-ID: <871u1bxgqt.fsf@tassilo.jf.intel.com> Date: Tue, 17 Dec 2013 14:19:38 -0800 From: Andi Kleen <andi@...stfloor.org> To: Dmitry Mikushin <dmitry@...nelgen.org> Cc: linux-kernel@...r.kernel.org Subject: Re: ia32 emulation on Pentium I Dmitry Mikushin <dmitry@...nelgen.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 <ak@...ux.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 -- ak@...ux.intel.com -- Speaking for myself only -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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