From: David S. Miller <davem@sunset.davemloft.net>
Date: Mon, 6 Mar 2006 00:41:56 +0000 (-0800)
Subject: [SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user().
X-Git-Tag: v2.6.17-rc1~1184^2~195
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=398d10830843bda7798f71052b54a5341a8ddd53;p=linux-2.6

[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user().

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc64/lib/Makefile b/arch/sparc64/lib/Makefile
index c295806500..813f622b5c 100644
--- a/arch/sparc64/lib/Makefile
+++ b/arch/sparc64/lib/Makefile
@@ -11,6 +11,7 @@ lib-y := PeeCeeI.o copy_page.o clear_page.o strlen.o strncmp.o \
 	 VISsave.o atomic.o bitops.o \
 	 U1memcpy.o U1copy_from_user.o U1copy_to_user.o \
 	 U3memcpy.o U3copy_from_user.o U3copy_to_user.o U3patch.o \
+	 NGmemcpy.o NGcopy_from_user.o NGcopy_to_user.o NGpatch.o \
 	 copy_in_user.o user_fixup.o memmove.o \
 	 mcount.o ipcsum.o rwsem.o xor.o find_bit.o delay.o
 
diff --git a/arch/sparc64/lib/NGcopy_from_user.S b/arch/sparc64/lib/NGcopy_from_user.S
new file mode 100644
index 0000000000..2d93456f76
--- /dev/null
+++ b/arch/sparc64/lib/NGcopy_from_user.S
@@ -0,0 +1,37 @@
+/* NGcopy_from_user.S: Niagara optimized copy from userspace.
+ *
+ * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
+ */
+
+#define EX_LD(x)		\
+98:	x;			\
+	.section .fixup;	\
+	.align 4;		\
+99:	wr	%g0, ASI_AIUS, %asi;\
+	retl;			\
+	 mov	1, %o0;		\
+	.section __ex_table,"a";\
+	.align 4;		\
+	.word 98b, 99b;		\
+	.text;			\
+	.align 4;
+
+#ifndef ASI_AIUS
+#define ASI_AIUS	0x11
+#endif
+
+#define FUNC_NAME		NGcopy_from_user
+#define LOAD(type,addr,dest)	type##a [addr] ASI_AIUS, dest
+#define LOAD_TWIN(addr_reg,dest0,dest1)	\
+	ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_AIUS, dest0
+#define EX_RETVAL(x)		0
+
+#ifdef __KERNEL__
+#define PREAMBLE					\
+	rd		%asi, %g1;			\
+	cmp		%g1, ASI_AIUS;			\
+	bne,pn		%icc, memcpy_user_stub;		\
+	 nop
+#endif
+
+#include "NGmemcpy.S"
diff --git a/arch/sparc64/lib/NGcopy_to_user.S b/arch/sparc64/lib/NGcopy_to_user.S
new file mode 100644
index 0000000000..4a12395b45
--- /dev/null
+++ b/arch/sparc64/lib/NGcopy_to_user.S
@@ -0,0 +1,40 @@
+/* NGcopy_to_user.S: Niagara optimized copy to userspace.
+ *
+ * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
+ */
+
+#define EX_ST(x)		\
+98:	x;			\
+	.section .fixup;	\
+	.align 4;		\
+99:	wr	%g0, ASI_AIUS, %asi;\
+	retl;			\
+	 mov	1, %o0;		\
+	.section __ex_table,"a";\
+	.align 4;		\
+	.word 98b, 99b;		\
+	.text;			\
+	.align 4;
+
+#ifndef ASI_AIUS
+#define ASI_AIUS	0x11
+#endif
+
+#define FUNC_NAME		NGcopy_to_user
+#define STORE(type,src,addr)	type##a src, [addr] ASI_AIUS
+#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS
+#define EX_RETVAL(x)		0
+
+#ifdef __KERNEL__
+	/* Writing to %asi is _expensive_ so we hardcode it.
+	 * Reading %asi to check for KERNEL_DS is comparatively
+	 * cheap.
+	 */
+#define PREAMBLE					\
+	rd		%asi, %g1;			\
+	cmp		%g1, ASI_AIUS;			\
+	bne,pn		%icc, memcpy_user_stub;		\
+	 nop
+#endif
+
+#include "U3memcpy.S"
diff --git a/arch/sparc64/lib/NGmemcpy.S b/arch/sparc64/lib/NGmemcpy.S
new file mode 100644
index 0000000000..a39aa3bd43
--- /dev/null
+++ b/arch/sparc64/lib/NGmemcpy.S
@@ -0,0 +1,364 @@
+/* NGmemcpy.S: Niagara optimized memcpy.
+ *
+ * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
+ */
+
+#ifdef __KERNEL__
+#include <asm/asi.h>
+#define GLOBAL_SPARE	%g7
+#define RESTORE_ASI	wr	%g0, ASI_AIUS, %asi
+#else
+#define GLOBAL_SPARE	%g5
+#define RESTORE_ASI
+#endif
+
+#ifndef STORE_ASI
+#define STORE_ASI	ASI_BLK_INIT_QUAD_LDD_P
+#endif
+
+#ifndef EX_LD
+#define EX_LD(x)	x
+#endif
+
+#ifndef EX_ST
+#define EX_ST(x)	x
+#endif
+
+#ifndef EX_RETVAL
+#define EX_RETVAL(x)	x
+#endif
+
+#ifndef LOAD
+#ifndef MEMCPY_DEBUG
+#define LOAD(type,addr,dest)	type [addr], dest
+#else
+#define LOAD(type,addr,dest)	type##a [addr] 0x80, dest
+#endif
+#endif
+
+#ifndef LOAD_TWIN
+#define LOAD_TWIN(addr_reg,dest0,dest1)	\
+	ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_P, dest0
+#endif
+
+#ifndef STORE
+#define STORE(type,src,addr)	type src, [addr]
+#endif
+
+#ifndef STORE_INIT
+#define STORE_INIT(src,addr)	stxa src, [addr] %asi
+#endif
+
+#ifndef FUNC_NAME
+#define FUNC_NAME	NGmemcpy
+#endif
+
+#ifndef PREAMBLE
+#define PREAMBLE
+#endif
+
+#ifndef XCC
+#define XCC xcc
+#endif
+
+	.register	%g2,#scratch
+	.register	%g3,#scratch
+
+	.text
+	.align		64
+
+	.globl	FUNC_NAME
+	.type	FUNC_NAME,#function
+FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
+	srlx		%o2, 31, %g2
+	cmp		%g2, 0
+	tne		%xcc, 5
+	PREAMBLE
+	mov		%o0, GLOBAL_SPARE
+	cmp		%o2, 0
+	be,pn		%XCC, 85f
+	 or		%o0, %o1, %o3
+	cmp		%o2, 16
+	blu,a,pn	%XCC, 80f
+	 or		%o3, %o2, %o3
+
+	/* 2 blocks (128 bytes) is the minimum we can do the block
+	 * copy with.  We need to ensure that we'll iterate at least
+	 * once in the block copy loop.  At worst we'll need to align
+	 * the destination to a 64-byte boundary which can chew up
+	 * to (64 - 1) bytes from the length before we perform the
+	 * block copy loop.
+	 */
+	cmp		%o2, (2 * 64)
+	blu,pt		%XCC, 70f
+	 andcc		%o3, 0x7, %g0
+
+	/* %o0:	dst
+	 * %o1:	src
+	 * %o2:	len  (known to be >= 128)
+	 *
+	 * The block copy loops will use %o4/%o5,%g2/%g3 as
+	 * temporaries while copying the data.
+	 */
+
+	LOAD(prefetch, %o1, #one_read)
+	wr		%g0, STORE_ASI, %asi
+
+	/* Align destination on 64-byte boundary.  */
+	andcc		%o0, (64 - 1), %o4
+	be,pt		%XCC, 2f
+	 sub		%o4, 64, %o4
+	sub		%g0, %o4, %o4	! bytes to align dst
+	sub		%o2, %o4, %o2
+1:	subcc		%o4, 1, %o4
+	EX_LD(LOAD(ldub, %o1, %g1))
+	EX_ST(STORE(stb, %g1, %o0))
+	add		%o1, 1, %o1
+	bne,pt		%XCC, 1b
+	add		%o0, 1, %o0
+
+	/* If the source is on a 16-byte boundary we can do
+	 * the direct block copy loop.  If it is 8-byte aligned
+	 * we can do the 16-byte loads offset by -8 bytes and the
+	 * init stores offset by one register.
+	 *
+	 * If the source is not even 8-byte aligned, we need to do
+	 * shifting and masking (basically integer faligndata).
+	 *
+	 * The careful bit with init stores is that if we store
+	 * to any part of the cache line we have to store the whole
+	 * cacheline else we can end up with corrupt L2 cache line
+	 * contents.  Since the loop works on 64-bytes of 64-byte
+	 * aligned store data at a time, this is easy to ensure.
+	 */
+2:
+	andcc		%o1, (16 - 1), %o4
+	andn		%o2, (64 - 1), %g1	! block copy loop iterator
+	sub		%o2, %g1, %o2		! final sub-block copy bytes
+	be,pt		%XCC, 50f
+	 cmp		%o4, 8
+	be,a,pt		%XCC, 10f
+	 sub		%o1, 0x8, %o1
+
+	/* Neither 8-byte nor 16-byte aligned, shift and mask.  */
+	mov		%g1, %o4
+	and		%o1, 0x7, %g1
+	sll		%g1, 3, %g1
+	mov		64, %o3
+	andn		%o1, 0x7, %o1
+	EX_LD(LOAD(ldx, %o1, %g2))
+	sub		%o3, %g1, %o3
+	sllx		%g2, %g1, %g2
+
+#define SWIVEL_ONE_DWORD(SRC, TMP1, TMP2, PRE_VAL, PRE_SHIFT, POST_SHIFT, DST)\
+	EX_LD(LOAD(ldx, SRC, TMP1)); \
+	srlx		TMP1, PRE_SHIFT, TMP2; \
+	or		TMP2, PRE_VAL, TMP2; \
+	EX_ST(STORE_INIT(TMP2, DST)); \
+	sllx		TMP1, POST_SHIFT, PRE_VAL;
+
+1:	add		%o1, 0x8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x00)
+	add		%o1, 0x8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x08)
+	add		%o1, 0x8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x10)
+	add		%o1, 0x8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x18)
+	add		%o1, 32, %o1
+	LOAD(prefetch, %o1, #one_read)
+	sub		%o1, 32 - 8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x20)
+	add		%o1, 8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x28)
+	add		%o1, 8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x30)
+	add		%o1, 8, %o1
+	SWIVEL_ONE_DWORD(%o1, %g3, %o5, %g2, %o3, %g1, %o0 + 0x38)
+	subcc		%o4, 64, %o4
+	bne,pt		%XCC, 1b
+	 add		%o0, 64, %o0
+
+#undef SWIVEL_ONE_DWORD
+
+	srl		%g1, 3, %g1
+	ba,pt		%XCC, 60f
+	 add		%o1, %g1, %o1
+
+10:	/* Destination is 64-byte aligned, source was only 8-byte
+	 * aligned but it has been subtracted by 8 and we perform
+	 * one twin load ahead, then add 8 back into source when
+	 * we finish the loop.
+	 */
+	EX_LD(LOAD_TWIN(%o1, %o4, %o5))
+1:	add		%o1, 16, %o1
+	EX_LD(LOAD_TWIN(%o1, %g2, %g3))
+	add		%o1, 16 + 32, %o1
+	LOAD(prefetch, %o1, #one_read)
+	sub		%o1, 32, %o1
+	EX_ST(STORE_INIT(%o5, %o0 + 0x00))	! initializes cache line
+	EX_ST(STORE_INIT(%g2, %o0 + 0x08))
+	EX_LD(LOAD_TWIN(%o1, %o4, %o5))
+	add		%o1, 16, %o1
+	EX_ST(STORE_INIT(%g3, %o0 + 0x10))
+	EX_ST(STORE_INIT(%o4, %o0 + 0x18))
+	EX_LD(LOAD_TWIN(%o1, %g2, %g3))
+	add		%o1, 16, %o1
+	EX_ST(STORE_INIT(%o5, %o0 + 0x20))
+	EX_ST(STORE_INIT(%g2, %o0 + 0x28))
+	EX_LD(LOAD_TWIN(%o1, %o4, %o5))
+	EX_ST(STORE_INIT(%g3, %o0 + 0x30))
+	EX_ST(STORE_INIT(%o4, %o0 + 0x38))
+	subcc		%g1, 64, %g1
+	bne,pt		%XCC, 1b
+	 add		%o0, 64, %o0
+
+	ba,pt		%XCC, 60f
+	 add		%o1, 0x8, %o1
+
+50:	/* Destination is 64-byte aligned, and source is 16-byte
+	 * aligned.
+	 */
+1:	EX_LD(LOAD_TWIN(%o1, %o4, %o5))
+	add	%o1, 16, %o1
+	EX_LD(LOAD_TWIN(%o1, %g2, %g3))
+	add	%o1, 16 + 32, %o1
+	LOAD(prefetch, %o1, #one_read)
+	sub	%o1, 32, %o1
+	EX_ST(STORE_INIT(%o4, %o0 + 0x00))	! initializes cache line
+	EX_ST(STORE_INIT(%o5, %o0 + 0x08))
+	EX_LD(LOAD_TWIN(%o1, %o4, %o5))
+	add	%o1, 16, %o1
+	EX_ST(STORE_INIT(%g2, %o0 + 0x10))
+	EX_ST(STORE_INIT(%g3, %o0 + 0x18))
+	EX_LD(LOAD_TWIN(%o1, %g2, %g3))
+	add	%o1, 16, %o1
+	EX_ST(STORE_INIT(%o4, %o0 + 0x20))
+	EX_ST(STORE_INIT(%o5, %o0 + 0x28))
+	EX_ST(STORE_INIT(%g2, %o0 + 0x30))
+	EX_ST(STORE_INIT(%g3, %o0 + 0x38))
+	subcc	%g1, 64, %g1
+	bne,pt	%XCC, 1b
+	 add	%o0, 64, %o0
+	/* fall through */
+
+60:	
+	/* %o2 contains any final bytes still needed to be copied
+	 * over. If anything is left, we copy it one byte at a time.
+	 */
+	RESTORE_ASI
+	brz,pt		%o2, 85f
+	 sub		%o0, %o1, %o3
+	ba,a,pt		%XCC, 90f
+
+	.align		64
+70: /* 16 < len <= 64 */
+	bne,pn		%XCC, 75f
+	 sub		%o0, %o1, %o3
+
+72:
+	andn		%o2, 0xf, %o4
+	and		%o2, 0xf, %o2
+1:	subcc		%o4, 0x10, %o4
+	EX_LD(LOAD(ldx, %o1, %o5))
+	add		%o1, 0x08, %o1
+	EX_LD(LOAD(ldx, %o1, %g1))
+	sub		%o1, 0x08, %o1
+	EX_ST(STORE(stx, %o5, %o1 + %o3))
+	add		%o1, 0x8, %o1
+	EX_ST(STORE(stx, %g1, %o1 + %o3))
+	bgu,pt		%XCC, 1b
+	 add		%o1, 0x8, %o1
+73:	andcc		%o2, 0x8, %g0
+	be,pt		%XCC, 1f
+	 nop
+	sub		%o2, 0x8, %o2
+	EX_LD(LOAD(ldx, %o1, %o5))
+	EX_ST(STORE(stx, %o5, %o1 + %o3))
+	add		%o1, 0x8, %o1
+1:	andcc		%o2, 0x4, %g0
+	be,pt		%XCC, 1f
+	 nop
+	sub		%o2, 0x4, %o2
+	EX_LD(LOAD(lduw, %o1, %o5))
+	EX_ST(STORE(stw, %o5, %o1 + %o3))
+	add		%o1, 0x4, %o1
+1:	cmp		%o2, 0
+	be,pt		%XCC, 85f
+	 nop
+	ba,pt		%xcc, 90f
+	 nop
+
+75:
+	andcc		%o0, 0x7, %g1
+	sub		%g1, 0x8, %g1
+	be,pn		%icc, 2f
+	 sub		%g0, %g1, %g1
+	sub		%o2, %g1, %o2
+
+1:	subcc		%g1, 1, %g1
+	EX_LD(LOAD(ldub, %o1, %o5))
+	EX_ST(STORE(stb, %o5, %o1 + %o3))
+	bgu,pt		%icc, 1b
+	 add		%o1, 1, %o1
+
+2:	add		%o1, %o3, %o0
+	andcc		%o1, 0x7, %g1
+	bne,pt		%icc, 8f
+	 sll		%g1, 3, %g1
+
+	cmp		%o2, 16
+	bgeu,pt		%icc, 72b
+	 nop
+	ba,a,pt		%xcc, 73b
+
+8:	mov		64, %o3
+	andn		%o1, 0x7, %o1
+	EX_LD(LOAD(ldx, %o1, %g2))
+	sub		%o3, %g1, %o3
+	andn		%o2, 0x7, %o4
+	sllx		%g2, %g1, %g2
+1:	add		%o1, 0x8, %o1
+	EX_LD(LOAD(ldx, %o1, %g3))
+	subcc		%o4, 0x8, %o4
+	srlx		%g3, %o3, %o5
+	or		%o5, %g2, %o5
+	EX_ST(STORE(stx, %o5, %o0))
+	add		%o0, 0x8, %o0
+	bgu,pt		%icc, 1b
+	 sllx		%g3, %g1, %g2
+
+	srl		%g1, 3, %g1
+	andcc		%o2, 0x7, %o2
+	be,pn		%icc, 85f
+	 add		%o1, %g1, %o1
+	ba,pt		%xcc, 90f
+	 sub		%o0, %o1, %o3
+
+	.align		64
+80: /* 0 < len <= 16 */
+	andcc		%o3, 0x3, %g0
+	bne,pn		%XCC, 90f
+	 sub		%o0, %o1, %o3
+
+1:
+	subcc		%o2, 4, %o2
+	EX_LD(LOAD(lduw, %o1, %g1))
+	EX_ST(STORE(stw, %g1, %o1 + %o3))
+	bgu,pt		%XCC, 1b
+	 add		%o1, 4, %o1
+
+85:	retl
+	 mov		EX_RETVAL(GLOBAL_SPARE), %o0
+
+	.align		32
+90:
+	subcc		%o2, 1, %o2
+	EX_LD(LOAD(ldub, %o1, %g1))
+	EX_ST(STORE(stb, %g1, %o1 + %o3))
+	bgu,pt		%XCC, 90b
+	 add		%o1, 1, %o1
+	retl
+	 mov		EX_RETVAL(GLOBAL_SPARE), %o0
+
+	.size		FUNC_NAME, .-FUNC_NAME
diff --git a/arch/sparc64/lib/NGpatch.S b/arch/sparc64/lib/NGpatch.S
new file mode 100644
index 0000000000..f13ec9e4c8
--- /dev/null
+++ b/arch/sparc64/lib/NGpatch.S
@@ -0,0 +1,32 @@
+/* NGpatch.S: Patch Ultra-I routines with Niagara variant.
+ *
+ * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
+ */
+
+#define BRANCH_ALWAYS	0x10680000
+#define NOP		0x01000000
+#define NG_DO_PATCH(OLD, NEW)	\
+	sethi	%hi(NEW), %g1; \
+	or	%g1, %lo(NEW), %g1; \
+	sethi	%hi(OLD), %g2; \
+	or	%g2, %lo(OLD), %g2; \
+	sub	%g1, %g2, %g1; \
+	sethi	%hi(BRANCH_ALWAYS), %g3; \
+	srl	%g1, 2, %g1; \
+	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
+	or	%g3, %g1, %g3; \
+	stw	%g3, [%g2]; \
+	sethi	%hi(NOP), %g3; \
+	or	%g3, %lo(NOP), %g3; \
+	stw	%g3, [%g2 + 0x4]; \
+	flush	%g2;
+
+	.globl	niagara_patch_copyops
+	.type	niagara_patch_copyops,#function
+niagara_patch_copyops:
+	NG_DO_PATCH(memcpy, NGmemcpy)
+	NG_DO_PATCH(___copy_from_user, NGcopy_from_user)
+	NG_DO_PATCH(___copy_to_user, NGcopy_to_user)
+	retl
+	 nop
+	.size	niagara_patch_copyops,.-niagara_patch_copyops