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Commit d9a73c00 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  um, x86: Cast to (u64 *) inside set_64bit()
  x86-32, asm: Directly access per-cpu GDT
  x86-64, asm: Directly access per-cpu IST
  x86, asm: Merge cmpxchg_486_u64() and cmpxchg8b_emu()
  x86, asm: Move cmpxchg emulation code to arch/x86/lib
  x86, asm: Clean up and simplify <asm/cmpxchg.h>
  x86, asm: Clean up and simplify set_64bit()
  x86: Add memory modify constraints to xchg() and cmpxchg()
  x86-64: Simplify loading initial_gs
  x86: Use symbolic MSR names
  x86: Remove redundant K6 MSRs
parents b304441c bf676945

arch/um/include/asm/pgtable-3level.h

+2 −2
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ 
	set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))



#ifdef CONFIG_64BIT

#define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval))

#define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval))

#else

#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))

#endif
@@ -73,7 +73,7 @@ static inline int pgd_newpage(pgd_t pgd) 
static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }



#ifdef CONFIG_64BIT

#define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))

#define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval))

#else

#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))

#endif

arch/x86/include/asm/cmpxchg_32.h

+89 −109
Original line number Diff line number Diff line
@@ -11,38 +11,42 @@ 
extern void __xchg_wrong_size(void);



/*

 * Note: no "lock" prefix even on SMP: xchg always implies lock anyway

 * Note 2: xchg has side effect, so that attribute volatile is necessary,

 *	  but generally the primitive is invalid, *ptr is output argument. --ANK

 * Note: no "lock" prefix even on SMP: xchg always implies lock anyway.

 * Since this is generally used to protect other memory information, we

 * use "asm volatile" and "memory" clobbers to prevent gcc from moving

 * information around.

 */



struct __xchg_dummy {

	unsigned long a[100];

};

#define __xg(x) ((struct __xchg_dummy *)(x))



#define __xchg(x, ptr, size)						\

({									\

	__typeof(*(ptr)) __x = (x);					\

	switch (size) {							\

	case 1:								\

		asm volatile("xchgb %b0,%1"				\

			     : "=q" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

	{								\

		volatile u8 *__ptr = (volatile u8 *)(ptr);		\

		asm volatile("xchgb %0,%1"				\

			     : "=q" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	case 2:								\

		asm volatile("xchgw %w0,%1"				\

			     : "=r" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

	{								\

		volatile u16 *__ptr = (volatile u16 *)(ptr);		\

		asm volatile("xchgw %0,%1"				\

			     : "=r" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	case 4:								\

	{								\

		volatile u32 *__ptr = (volatile u32 *)(ptr);		\

		asm volatile("xchgl %0,%1"				\

			     : "=r" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

			     : "=r" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	default:							\

		__xchg_wrong_size();					\

	}								\
@@ -53,60 +57,33 @@ struct __xchg_dummy { 
	__xchg((v), (ptr), sizeof(*ptr))



/*

 * The semantics of XCHGCMP8B are a bit strange, this is why

 * there is a loop and the loading of %%eax and %%edx has to

 * be inside. This inlines well in most cases, the cached

 * cost is around ~38 cycles. (in the future we might want

 * to do an SIMD/3DNOW!/MMX/FPU 64-bit store here, but that

 * might have an implicit FPU-save as a cost, so it's not

 * clear which path to go.)

 * CMPXCHG8B only writes to the target if we had the previous

 * value in registers, otherwise it acts as a read and gives us the

 * "new previous" value.  That is why there is a loop.  Preloading

 * EDX:EAX is a performance optimization: in the common case it means

 * we need only one locked operation.

 *

 * cmpxchg8b must be used with the lock prefix here to allow

 * the instruction to be executed atomically, see page 3-102

 * of the instruction set reference 24319102.pdf. We need

 * the reader side to see the coherent 64bit value.

 * A SIMD/3DNOW!/MMX/FPU 64-bit store here would require at the very

 * least an FPU save and/or %cr0.ts manipulation.

 *

 * cmpxchg8b must be used with the lock prefix here to allow the

 * instruction to be executed atomically.  We need to have the reader

 * side to see the coherent 64bit value.

 */

static inline void __set_64bit(unsigned long long *ptr,

			       unsigned int low, unsigned int high)

static inline void set_64bit(volatile u64 *ptr, u64 value)

{

	u32 low  = value;

	u32 high = value >> 32;

	u64 prev = *ptr;



	asm volatile("\n1:\t"

		     "movl (%0), %%eax\n\t"

		     "movl 4(%0), %%edx\n\t"

		     LOCK_PREFIX "cmpxchg8b (%0)\n\t"

		     LOCK_PREFIX "cmpxchg8b %0\n\t"

		     "jnz 1b"

		     : /* no outputs */

		     : "D"(ptr),

		       "b"(low),

		       "c"(high)

		     : "ax", "dx", "memory");

}



static inline void __set_64bit_constant(unsigned long long *ptr,

					unsigned long long value)

{

	__set_64bit(ptr, (unsigned int)value, (unsigned int)(value >> 32));

}



#define ll_low(x)	*(((unsigned int *)&(x)) + 0)

#define ll_high(x)	*(((unsigned int *)&(x)) + 1)



static inline void __set_64bit_var(unsigned long long *ptr,

				   unsigned long long value)

{

	__set_64bit(ptr, ll_low(value), ll_high(value));

		     : "=m" (*ptr), "+A" (prev)

		     : "b" (low), "c" (high)

		     : "memory");

}



#define set_64bit(ptr, value)			\

	(__builtin_constant_p((value))		\

	 ? __set_64bit_constant((ptr), (value))	\

	 : __set_64bit_var((ptr), (value)))



#define _set_64bit(ptr, value)						\

	(__builtin_constant_p(value)					\

	 ? __set_64bit(ptr, (unsigned int)(value),			\

		       (unsigned int)((value) >> 32))			\

	 : __set_64bit(ptr, ll_low((value)), ll_high((value))))



extern void __cmpxchg_wrong_size(void);



/*
@@ -121,23 +98,32 @@ extern void __cmpxchg_wrong_size(void); 
	__typeof__(*(ptr)) __new = (new);				\

	switch (size) {							\

	case 1:								\

		asm volatile(lock "cmpxchgb %b1,%2"			\

			     : "=a"(__ret)				\

			     : "q"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u8 *__ptr = (volatile u8 *)(ptr);		\

		asm volatile(lock "cmpxchgb %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "q" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	case 2:								\

		asm volatile(lock "cmpxchgw %w1,%2"			\

			     : "=a"(__ret)				\

			     : "r"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u16 *__ptr = (volatile u16 *)(ptr);		\

		asm volatile(lock "cmpxchgw %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "r" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	case 4:								\

		asm volatile(lock "cmpxchgl %1,%2"			\

			     : "=a"(__ret)				\

			     : "r"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u32 *__ptr = (volatile u32 *)(ptr);		\

		asm volatile(lock "cmpxchgl %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "r" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	default:							\

		__cmpxchg_wrong_size();					\

	}								\
@@ -175,31 +161,27 @@ extern void __cmpxchg_wrong_size(void); 
					       (unsigned long long)(n)))

#endif



static inline unsigned long long __cmpxchg64(volatile void *ptr,

					     unsigned long long old,

					     unsigned long long new)

static inline u64 __cmpxchg64(volatile u64 *ptr, u64 old, u64 new)

{

	unsigned long long prev;

	asm volatile(LOCK_PREFIX "cmpxchg8b %3"

		     : "=A"(prev)

		     : "b"((unsigned long)new),

		       "c"((unsigned long)(new >> 32)),

		       "m"(*__xg(ptr)),

	u64 prev;

	asm volatile(LOCK_PREFIX "cmpxchg8b %1"

		     : "=A" (prev),

		       "+m" (*ptr)

		     : "b" ((u32)new),

		       "c" ((u32)(new >> 32)),

		       "0" (old)

		     : "memory");

	return prev;

}



static inline unsigned long long __cmpxchg64_local(volatile void *ptr,

						   unsigned long long old,

						   unsigned long long new)

static inline u64 __cmpxchg64_local(volatile u64 *ptr, u64 old, u64 new)

{

	unsigned long long prev;

	asm volatile("cmpxchg8b %3"

		     : "=A"(prev)

		     : "b"((unsigned long)new),

		       "c"((unsigned long)(new >> 32)),

		       "m"(*__xg(ptr)),

	u64 prev;

	asm volatile("cmpxchg8b %1"

		     : "=A" (prev),

		       "+m" (*ptr)

		     : "b" ((u32)new),

		       "c" ((u32)(new >> 32)),

		       "0" (old)

		     : "memory");

	return prev;
@@ -264,8 +246,6 @@ static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old, 
 * to simulate the cmpxchg8b on the 80386 and 80486 CPU.

 */



extern unsigned long long cmpxchg_486_u64(volatile void *, u64, u64);



#define cmpxchg64(ptr, o, n)					\

({								\

	__typeof__(*(ptr)) __ret;				\
@@ -283,20 +263,20 @@ extern unsigned long long cmpxchg_486_u64(volatile void *, u64, u64); 
	__ret; })







#define cmpxchg64_local(ptr, o, n)				\

({								\

	__typeof__(*(ptr)) __ret;				\

	if (likely(boot_cpu_data.x86 > 4))				\

		__ret = (__typeof__(*(ptr)))__cmpxchg64_local((ptr),	\

				(unsigned long long)(o),		\

				(unsigned long long)(n));		\

	else								\

		__ret = (__typeof__(*(ptr)))cmpxchg_486_u64((ptr),	\

				(unsigned long long)(o),		\

				(unsigned long long)(n));		\

	__ret;								\

})

	__typeof__(*(ptr)) __old = (o);				\

	__typeof__(*(ptr)) __new = (n);				\

	alternative_io("call cmpxchg8b_emu",			\

		       "cmpxchg8b (%%esi)" ,			\

		       X86_FEATURE_CX8,				\

		       "=A" (__ret),				\

		       "S" ((ptr)), "0" (__old),		\

		       "b" ((unsigned int)__new),		\

		       "c" ((unsigned int)(__new>>32))		\

		       : "memory");				\

	__ret; })



#endif

arch/x86/include/asm/cmpxchg_64.h

+52 −31
Original line number Diff line number Diff line
@@ -3,51 +3,60 @@ 


#include <asm/alternative.h> /* Provides LOCK_PREFIX */



#define __xg(x) ((volatile long *)(x))



static inline void set_64bit(volatile unsigned long *ptr, unsigned long val)

static inline void set_64bit(volatile u64 *ptr, u64 val)

{

	*ptr = val;

}



#define _set_64bit set_64bit



extern void __xchg_wrong_size(void);

extern void __cmpxchg_wrong_size(void);



/*

 * Note: no "lock" prefix even on SMP: xchg always implies lock anyway

 * Note 2: xchg has side effect, so that attribute volatile is necessary,

 *	  but generally the primitive is invalid, *ptr is output argument. --ANK

 * Note: no "lock" prefix even on SMP: xchg always implies lock anyway.

 * Since this is generally used to protect other memory information, we

 * use "asm volatile" and "memory" clobbers to prevent gcc from moving

 * information around.

 */

#define __xchg(x, ptr, size)						\

({									\

	__typeof(*(ptr)) __x = (x);					\

	switch (size) {							\

	case 1:								\

		asm volatile("xchgb %b0,%1"				\

			     : "=q" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

	{								\

		volatile u8 *__ptr = (volatile u8 *)(ptr);		\

		asm volatile("xchgb %0,%1"				\

			     : "=q" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	case 2:								\

		asm volatile("xchgw %w0,%1"				\

			     : "=r" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

	{								\

		volatile u16 *__ptr = (volatile u16 *)(ptr);		\

		asm volatile("xchgw %0,%1"				\

			     : "=r" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	case 4:								\

		asm volatile("xchgl %k0,%1"				\

			     : "=r" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

	{								\

		volatile u32 *__ptr = (volatile u32 *)(ptr);		\

		asm volatile("xchgl %0,%1"				\

			     : "=r" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	case 8:								\

	{								\

		volatile u64 *__ptr = (volatile u64 *)(ptr);		\

		asm volatile("xchgq %0,%1"				\

			     : "=r" (__x)				\

			     : "m" (*__xg(ptr)), "0" (__x)		\

			     : "=r" (__x), "+m" (*__ptr)		\

			     : "0" (__x)				\

			     : "memory");				\

		break;							\

	}								\

	default:							\

		__xchg_wrong_size();					\

	}								\
@@ -71,29 +80,41 @@ extern void __cmpxchg_wrong_size(void); 
	__typeof__(*(ptr)) __new = (new);				\

	switch (size) {							\

	case 1:								\

		asm volatile(lock "cmpxchgb %b1,%2"			\

			     : "=a"(__ret)				\

			     : "q"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u8 *__ptr = (volatile u8 *)(ptr);		\

		asm volatile(lock "cmpxchgb %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "q" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	case 2:								\

		asm volatile(lock "cmpxchgw %w1,%2"			\

			     : "=a"(__ret)				\

			     : "r"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u16 *__ptr = (volatile u16 *)(ptr);		\

		asm volatile(lock "cmpxchgw %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "r" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	case 4:								\

		asm volatile(lock "cmpxchgl %k1,%2"			\

			     : "=a"(__ret)				\

			     : "r"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u32 *__ptr = (volatile u32 *)(ptr);		\

		asm volatile(lock "cmpxchgl %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "r" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	case 8:								\

		asm volatile(lock "cmpxchgq %1,%2"			\

			     : "=a"(__ret)				\

			     : "r"(__new), "m"(*__xg(ptr)), "0"(__old)	\

	{								\

		volatile u64 *__ptr = (volatile u64 *)(ptr);		\

		asm volatile(lock "cmpxchgq %2,%1"			\

			     : "=a" (__ret), "+m" (*__ptr)		\

			     : "r" (__new), "0" (__old)			\

			     : "memory");				\

		break;							\

	}								\

	default:							\

		__cmpxchg_wrong_size();					\

	}								\

arch/x86/include/asm/msr-index.h

+0 −2
Original line number Diff line number Diff line
@@ -161,8 +161,6 @@ 
#define MSR_K7_FID_VID_STATUS		0xc0010042



/* K6 MSRs */

#define MSR_K6_EFER			0xc0000080

#define MSR_K6_STAR			0xc0000081

#define MSR_K6_WHCR			0xc0000082

#define MSR_K6_UWCCR			0xc0000085

#define MSR_K6_EPMR			0xc0000086

arch/x86/kernel/acpi/realmode/wakeup.S

+1 −1
Original line number Diff line number Diff line
@@ -104,7 +104,7 @@ _start: 
	movl	%eax, %ecx

	orl	%edx, %ecx

	jz	1f

	movl	$0xc0000080, %ecx

	movl	$MSR_EFER, %ecx

	wrmsr

1: