xor_32.h

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	__asm__ __volatile__ (
	" .align 32,0x90             ;\n"
	" 1:                         ;\n"
	"       movq   (%1), %%mm0   ;\n"
	"       movq  8(%1), %%mm1   ;\n"
	"       pxor   (%2), %%mm0   ;\n"
	"       pxor  8(%2), %%mm1   ;\n"
	"       movq 16(%1), %%mm2   ;\n"
	"       pxor   (%3), %%mm0   ;\n"
	"       pxor  8(%3), %%mm1   ;\n"
	"       pxor 16(%2), %%mm2   ;\n"
	"       pxor   (%4), %%mm0   ;\n"
	"       pxor  8(%4), %%mm1   ;\n"
	"       pxor 16(%3), %%mm2   ;\n"
	"       movq 24(%1), %%mm3   ;\n"
	"       pxor   (%5), %%mm0   ;\n"
	"       pxor  8(%5), %%mm1   ;\n"
	"       movq %%mm0,   (%1)   ;\n"
	"       pxor 16(%4), %%mm2   ;\n"
	"       pxor 24(%2), %%mm3   ;\n"
	"       movq %%mm1,  8(%1)   ;\n"
	"       pxor 16(%5), %%mm2   ;\n"
	"       pxor 24(%3), %%mm3   ;\n"
	"       movq 32(%1), %%mm4   ;\n"
	"       movq %%mm2, 16(%1)   ;\n"
	"       pxor 24(%4), %%mm3   ;\n"
	"       pxor 32(%2), %%mm4   ;\n"
	"       movq 40(%1), %%mm5   ;\n"
	"       pxor 24(%5), %%mm3   ;\n"
	"       pxor 32(%3), %%mm4   ;\n"
	"       pxor 40(%2), %%mm5   ;\n"
	"       movq %%mm3, 24(%1)   ;\n"
	"       pxor 32(%4), %%mm4   ;\n"
	"       pxor 40(%3), %%mm5   ;\n"
	"       movq 48(%1), %%mm6   ;\n"
	"       movq 56(%1), %%mm7   ;\n"
	"       pxor 32(%5), %%mm4   ;\n"
	"       pxor 40(%4), %%mm5   ;\n"
	"       pxor 48(%2), %%mm6   ;\n"
	"       pxor 56(%2), %%mm7   ;\n"
	"       movq %%mm4, 32(%1)   ;\n"
	"       pxor 48(%3), %%mm6   ;\n"
	"       pxor 56(%3), %%mm7   ;\n"
	"       pxor 40(%5), %%mm5   ;\n"
	"       pxor 48(%4), %%mm6   ;\n"
	"       pxor 56(%4), %%mm7   ;\n"
	"       movq %%mm5, 40(%1)   ;\n"
	"       pxor 48(%5), %%mm6   ;\n"
	"       pxor 56(%5), %%mm7   ;\n"
	"       movq %%mm6, 48(%1)   ;\n"
	"       movq %%mm7, 56(%1)   ;\n"
      
	"       addl $64, %1         ;\n"
	"       addl $64, %2         ;\n"
	"       addl $64, %3         ;\n"
	"       addl $64, %4         ;\n"
	"       addl $64, %5         ;\n"
	"       decl %0              ;\n"
	"       jnz 1b               ;\n"
	: "+r" (lines),
	  "+r" (p1), "+r" (p2), "+r" (p3)
	: "r" (p4), "r" (p5)
	: "memory");

	/* p4 and p5 were modified, and now the variables are dead.
	   Clobber them just to be sure nobody does something stupid
	   like assuming they have some legal value.  */
	__asm__ ("" : "=r" (p4), "=r" (p5));

	kernel_fpu_end();
}

static struct xor_block_template xor_block_pII_mmx = {
	.name = "pII_mmx",
	.do_2 = xor_pII_mmx_2,
	.do_3 = xor_pII_mmx_3,
	.do_4 = xor_pII_mmx_4,
	.do_5 = xor_pII_mmx_5,
};

static struct xor_block_template xor_block_p5_mmx = {
	.name = "p5_mmx",
	.do_2 = xor_p5_mmx_2,
	.do_3 = xor_p5_mmx_3,
	.do_4 = xor_p5_mmx_4,
	.do_5 = xor_p5_mmx_5,
};

/*
 * Cache avoiding checksumming functions utilizing KNI instructions
 * Copyright (C) 1999 Zach Brown (with obvious credit due Ingo)
 */

#define XMMS_SAVE do {				\
	preempt_disable();			\
	cr0 = read_cr0();			\
	clts();					\
	__asm__ __volatile__ ( 			\
		"movups %%xmm0,(%0)	;\n\t"	\
		"movups %%xmm1,0x10(%0)	;\n\t"	\
		"movups %%xmm2,0x20(%0)	;\n\t"	\
		"movups %%xmm3,0x30(%0)	;\n\t"	\
		:				\
		: "r" (xmm_save) 		\
		: "memory");			\
} while(0)

#define XMMS_RESTORE do {			\
	__asm__ __volatile__ ( 			\
		"sfence			;\n\t"	\
		"movups (%0),%%xmm0	;\n\t"	\
		"movups 0x10(%0),%%xmm1	;\n\t"	\
		"movups 0x20(%0),%%xmm2	;\n\t"	\
		"movups 0x30(%0),%%xmm3	;\n\t"	\
		:				\
		: "r" (xmm_save)		\
		: "memory");			\
	write_cr0(cr0);				\
	preempt_enable();			\
} while(0)

#define ALIGN16 __attribute__((aligned(16)))

#define OFFS(x)		"16*("#x")"
#define PF_OFFS(x)	"256+16*("#x")"
#define	PF0(x)		"	prefetchnta "PF_OFFS(x)"(%1)		;\n"
#define LD(x,y)		"       movaps   "OFFS(x)"(%1), %%xmm"#y"	;\n"
#define ST(x,y)		"       movaps %%xmm"#y",   "OFFS(x)"(%1)	;\n"
#define PF1(x)		"	prefetchnta "PF_OFFS(x)"(%2)		;\n"
#define PF2(x)		"	prefetchnta "PF_OFFS(x)"(%3)		;\n"
#define PF3(x)		"	prefetchnta "PF_OFFS(x)"(%4)		;\n"
#define PF4(x)		"	prefetchnta "PF_OFFS(x)"(%5)		;\n"
#define PF5(x)		"	prefetchnta "PF_OFFS(x)"(%6)		;\n"
#define XO1(x,y)	"       xorps   "OFFS(x)"(%2), %%xmm"#y"	;\n"
#define XO2(x,y)	"       xorps   "OFFS(x)"(%3), %%xmm"#y"	;\n"
#define XO3(x,y)	"       xorps   "OFFS(x)"(%4), %%xmm"#y"	;\n"
#define XO4(x,y)	"       xorps   "OFFS(x)"(%5), %%xmm"#y"	;\n"
#define XO5(x,y)	"       xorps   "OFFS(x)"(%6), %%xmm"#y"	;\n"


static void
xor_sse_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
{
        unsigned long lines = bytes >> 8;
	char xmm_save[16*4] ALIGN16;
	int cr0;

	XMMS_SAVE;

        __asm__ __volatile__ (
#undef BLOCK
#define BLOCK(i) \
		LD(i,0)					\
			LD(i+1,1)			\
		PF1(i)					\
				PF1(i+2)		\
				LD(i+2,2)		\
					LD(i+3,3)	\
		PF0(i+4)				\
				PF0(i+6)		\
		XO1(i,0)				\
			XO1(i+1,1)			\
				XO1(i+2,2)		\
					XO1(i+3,3)	\
		ST(i,0)					\
			ST(i+1,1)			\
				ST(i+2,2)		\
					ST(i+3,3)	\


		PF0(0)
				PF0(2)

	" .align 32			;\n"
        " 1:                            ;\n"

		BLOCK(0)
		BLOCK(4)
		BLOCK(8)
		BLOCK(12)

        "       addl $256, %1           ;\n"
        "       addl $256, %2           ;\n"
        "       decl %0                 ;\n"
        "       jnz 1b                  ;\n"
	: "+r" (lines),
	  "+r" (p1), "+r" (p2)
	:
        : "memory");

	XMMS_RESTORE;
}

static void
xor_sse_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	  unsigned long *p3)
{
        unsigned long lines = bytes >> 8;
	char xmm_save[16*4] ALIGN16;
	int cr0;

	XMMS_SAVE;

        __asm__ __volatile__ (
#undef BLOCK
#define BLOCK(i) \
		PF1(i)					\
				PF1(i+2)		\
		LD(i,0)					\
			LD(i+1,1)			\
				LD(i+2,2)		\
					LD(i+3,3)	\
		PF2(i)					\
				PF2(i+2)		\
		PF0(i+4)				\
				PF0(i+6)		\
		XO1(i,0)				\
			XO1(i+1,1)			\
				XO1(i+2,2)		\
					XO1(i+3,3)	\
		XO2(i,0)				\
			XO2(i+1,1)			\
				XO2(i+2,2)		\
					XO2(i+3,3)	\
		ST(i,0)					\
			ST(i+1,1)			\
				ST(i+2,2)		\
					ST(i+3,3)	\


		PF0(0)
				PF0(2)

	" .align 32			;\n"
        " 1:                            ;\n"

		BLOCK(0)
		BLOCK(4)
		BLOCK(8)
		BLOCK(12)

        "       addl $256, %1           ;\n"
        "       addl $256, %2           ;\n"
        "       addl $256, %3           ;\n"
        "       decl %0                 ;\n"
        "       jnz 1b                  ;\n"
	: "+r" (lines),
	  "+r" (p1), "+r"(p2), "+r"(p3)
	:
        : "memory" );

	XMMS_RESTORE;
}

static void
xor_sse_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	  unsigned long *p3, unsigned long *p4)
{
        unsigned long lines = bytes >> 8;
	char xmm_save[16*4] ALIGN16;
	int cr0;

	XMMS_SAVE;

        __asm__ __volatile__ (
#undef BLOCK
#define BLOCK(i) \
		PF1(i)					\
				PF1(i+2)		\
		LD(i,0)					\
			LD(i+1,1)			\
				LD(i+2,2)		\
					LD(i+3,3)	\
		PF2(i)					\
				PF2(i+2)		\
		XO1(i,0)				\
			XO1(i+1,1)			\
				XO1(i+2,2)		\
					XO1(i+3,3)	\
		PF3(i)					\
				PF3(i+2)		\
		PF0(i+4)				\
				PF0(i+6)		\
		XO2(i,0)				\
			XO2(i+1,1)			\
				XO2(i+2,2)		\
					XO2(i+3,3)	\
		XO3(i,0)				\
			XO3(i+1,1)			\
				XO3(i+2,2)		\
					XO3(i+3,3)	\
		ST(i,0)					\
			ST(i+1,1)			\
				ST(i+2,2)		\
					ST(i+3,3)	\


		PF0(0)
				PF0(2)

	" .align 32			;\n"
        " 1:                            ;\n"

		BLOCK(0)
		BLOCK(4)
		BLOCK(8)
		BLOCK(12)

        "       addl $256, %1           ;\n"
        "       addl $256, %2           ;\n"
        "       addl $256, %3           ;\n"
        "       addl $256, %4           ;\n"
        "       decl %0                 ;\n"
        "       jnz 1b                  ;\n"
	: "+r" (lines),
	  "+r" (p1), "+r" (p2), "+r" (p3), "+r" (p4)
	:
        : "memory" );

	XMMS_RESTORE;
}

static void
xor_sse_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
	  unsigned long *p3, unsigned long *p4, unsigned long *p5)
{
        unsigned long lines = bytes >> 8;
	char xmm_save[16*4] ALIGN16;
	int cr0;

	XMMS_SAVE;

	/* Make sure GCC forgets anything it knows about p4 or p5,
	   such that it won't pass to the asm volatile below a
	   register that is shared with any other variable.  That's
	   because we modify p4 and p5 there, but we can't mark them
	   as read/write, otherwise we'd overflow the 10-asm-operands
	   limit of GCC < 3.1.  */
	__asm__ ("" : "+r" (p4), "+r" (p5));

        __asm__ __volatile__ (
#undef BLOCK
#define BLOCK(i) \
		PF1(i)					\
				PF1(i+2)		\
		LD(i,0)					\
			LD(i+1,1)			\
				LD(i+2,2)		\
					LD(i+3,3)	\
		PF2(i)					\
				PF2(i+2)		\
		XO1(i,0)				\
			XO1(i+1,1)			\
				XO1(i+2,2)		\
					XO1(i+3,3)	\
		PF3(i)					\
				PF3(i+2)		\
		XO2(i,0)				\
			XO2(i+1,1)			\
				XO2(i+2,2)		\
					XO2(i+3,3)	\
		PF4(i)					\
				PF4(i+2)		\
		PF0(i+4)				\
				PF0(i+6)		\
		XO3(i,0)				\
			XO3(i+1,1)			\
				XO3(i+2,2)		\
					XO3(i+3,3)	\
		XO4(i,0)				\
			XO4(i+1,1)			\
				XO4(i+2,2)		\
					XO4(i+3,3)	\
		ST(i,0)					\
			ST(i+1,1)			\
				ST(i+2,2)		\
					ST(i+3,3)	\


		PF0(0)
				PF0(2)

	" .align 32			;\n"
        " 1:                            ;\n"

		BLOCK(0)
		BLOCK(4)
		BLOCK(8)
		BLOCK(12)

        "       addl $256, %1           ;\n"
        "       addl $256, %2           ;\n"
        "       addl $256, %3           ;\n"
        "       addl $256, %4           ;\n"
        "       addl $256, %5           ;\n"
        "       decl %0                 ;\n"
        "       jnz 1b                  ;\n"
	: "+r" (lines),
	  "+r" (p1), "+r" (p2), "+r" (p3)
	: "r" (p4), "r" (p5)
	: "memory");

	/* p4 and p5 were modified, and now the variables are dead.
	   Clobber them just to be sure nobody does something stupid
	   like assuming they have some legal value.  */
	__asm__ ("" : "=r" (p4), "=r" (p5));

	XMMS_RESTORE;
}

static struct xor_block_template xor_block_pIII_sse = {
        .name = "pIII_sse",
        .do_2 =  xor_sse_2,
        .do_3 =  xor_sse_3,
        .do_4 =  xor_sse_4,
        .do_5 = xor_sse_5,
};

/* Also try the generic routines.  */
#include <asm-generic/xor.h>

#undef XOR_TRY_TEMPLATES
#define XOR_TRY_TEMPLATES				\
	do {						\
		xor_speed(&xor_block_8regs);		\
		xor_speed(&xor_block_8regs_p);		\
		xor_speed(&xor_block_32regs);		\
		xor_speed(&xor_block_32regs_p);		\
	        if (cpu_has_xmm)			\
			xor_speed(&xor_block_pIII_sse);	\
	        if (cpu_has_mmx) {			\
	                xor_speed(&xor_block_pII_mmx);	\
	                xor_speed(&xor_block_p5_mmx);	\
	        }					\
	} while (0)

/* We force the use of the SSE xor block because it can write around L2.
   We may also be able to load into the L1 only depending on how the cpu
   deals with a load to a line that is being prefetched.  */
#define XOR_SELECT_TEMPLATE(FASTEST) \
	(cpu_has_xmm ? &xor_block_pIII_sse : FASTEST)