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linux-pinenote/arch/sparc/lib/NG2memcpy.S
David S. Miller 5aa4ecfd0d sparc64: Add membar to Niagara2 memcpy code. 
This is the prevent previous stores from overlapping the block stores
done by the memcpy loop.

Based upon a glibc patch by Jose E. Marchesi

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-05-17 11:28:05 -07:00

521 lines
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/* NG2memcpy.S: Niagara-2 optimized memcpy.
*
* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
*/
#ifdef __KERNEL__
#include <asm/visasm.h>
#include <asm/asi.h>
#define GLOBAL_SPARE %g7
#else
#define ASI_PNF 0x82
#define ASI_BLK_P 0xf0
#define ASI_BLK_INIT_QUAD_LDD_P 0xe2
#define FPRS_FEF 0x04
#ifdef MEMCPY_DEBUG
#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \
clr %g1; clr %g2; clr %g3; clr %g5; subcc %g0, %g0, %g0;
#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
#else
#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
#endif
#define GLOBAL_SPARE %g5
#endif
#ifndef STORE_ASI
#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P
#else
#define STORE_ASI 0x80 /* ASI_P */
#endif
#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
#define LOAD(type,addr,dest) type [addr], dest
#endif
#ifndef LOAD_BLK
#define LOAD_BLK(addr,dest) ldda [addr] ASI_BLK_P, dest
#endif
#ifndef STORE
#ifndef MEMCPY_DEBUG
#define STORE(type,src,addr) type src, [addr]
#else
#define STORE(type,src,addr) type##a src, [addr] 0x80
#endif
#endif
#ifndef STORE_BLK
#define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_P
#endif
#ifndef STORE_INIT
#define STORE_INIT(src,addr) stxa src, [addr] STORE_ASI
#endif
#ifndef FUNC_NAME
#define FUNC_NAME NG2memcpy
#endif
#ifndef PREAMBLE
#define PREAMBLE
#endif
#ifndef XCC
#define XCC xcc
#endif
#define FREG_FROB(x0, x1, x2, x3, x4, x5, x6, x7, x8) \
faligndata %x0, %x1, %f0; \
faligndata %x1, %x2, %f2; \
faligndata %x2, %x3, %f4; \
faligndata %x3, %x4, %f6; \
faligndata %x4, %x5, %f8; \
faligndata %x5, %x6, %f10; \
faligndata %x6, %x7, %f12; \
faligndata %x7, %x8, %f14;
#define FREG_MOVE_1(x0) \
fsrc2 %x0, %f0;
#define FREG_MOVE_2(x0, x1) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2;
#define FREG_MOVE_3(x0, x1, x2) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2; \
fsrc2 %x2, %f4;
#define FREG_MOVE_4(x0, x1, x2, x3) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2; \
fsrc2 %x2, %f4; \
fsrc2 %x3, %f6;
#define FREG_MOVE_5(x0, x1, x2, x3, x4) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2; \
fsrc2 %x2, %f4; \
fsrc2 %x3, %f6; \
fsrc2 %x4, %f8;
#define FREG_MOVE_6(x0, x1, x2, x3, x4, x5) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2; \
fsrc2 %x2, %f4; \
fsrc2 %x3, %f6; \
fsrc2 %x4, %f8; \
fsrc2 %x5, %f10;
#define FREG_MOVE_7(x0, x1, x2, x3, x4, x5, x6) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2; \
fsrc2 %x2, %f4; \
fsrc2 %x3, %f6; \
fsrc2 %x4, %f8; \
fsrc2 %x5, %f10; \
fsrc2 %x6, %f12;
#define FREG_MOVE_8(x0, x1, x2, x3, x4, x5, x6, x7) \
fsrc2 %x0, %f0; \
fsrc2 %x1, %f2; \
fsrc2 %x2, %f4; \
fsrc2 %x3, %f6; \
fsrc2 %x4, %f8; \
fsrc2 %x5, %f10; \
fsrc2 %x6, %f12; \
fsrc2 %x7, %f14;
#define FREG_LOAD_1(base, x0) \
EX_LD(LOAD(ldd, base + 0x00, %x0))
#define FREG_LOAD_2(base, x0, x1) \
EX_LD(LOAD(ldd, base + 0x00, %x0)); \
EX_LD(LOAD(ldd, base + 0x08, %x1));
#define FREG_LOAD_3(base, x0, x1, x2) \
EX_LD(LOAD(ldd, base + 0x00, %x0)); \
EX_LD(LOAD(ldd, base + 0x08, %x1)); \
EX_LD(LOAD(ldd, base + 0x10, %x2));
#define FREG_LOAD_4(base, x0, x1, x2, x3) \
EX_LD(LOAD(ldd, base + 0x00, %x0)); \
EX_LD(LOAD(ldd, base + 0x08, %x1)); \
EX_LD(LOAD(ldd, base + 0x10, %x2)); \
EX_LD(LOAD(ldd, base + 0x18, %x3));
#define FREG_LOAD_5(base, x0, x1, x2, x3, x4) \
EX_LD(LOAD(ldd, base + 0x00, %x0)); \
EX_LD(LOAD(ldd, base + 0x08, %x1)); \
EX_LD(LOAD(ldd, base + 0x10, %x2)); \
EX_LD(LOAD(ldd, base + 0x18, %x3)); \
EX_LD(LOAD(ldd, base + 0x20, %x4));
#define FREG_LOAD_6(base, x0, x1, x2, x3, x4, x5) \
EX_LD(LOAD(ldd, base + 0x00, %x0)); \
EX_LD(LOAD(ldd, base + 0x08, %x1)); \
EX_LD(LOAD(ldd, base + 0x10, %x2)); \
EX_LD(LOAD(ldd, base + 0x18, %x3)); \
EX_LD(LOAD(ldd, base + 0x20, %x4)); \
EX_LD(LOAD(ldd, base + 0x28, %x5));
#define FREG_LOAD_7(base, x0, x1, x2, x3, x4, x5, x6) \
EX_LD(LOAD(ldd, base + 0x00, %x0)); \
EX_LD(LOAD(ldd, base + 0x08, %x1)); \
EX_LD(LOAD(ldd, base + 0x10, %x2)); \
EX_LD(LOAD(ldd, base + 0x18, %x3)); \
EX_LD(LOAD(ldd, base + 0x20, %x4)); \
EX_LD(LOAD(ldd, base + 0x28, %x5)); \
EX_LD(LOAD(ldd, base + 0x30, %x6));
.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, %o3
cmp %o2, 0
be,pn %XCC, 85f
or %o0, %o1, GLOBAL_SPARE
cmp %o2, 16
blu,a,pn %XCC, 80f
or GLOBAL_SPARE, %o2, GLOBAL_SPARE
/* 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.
*
* However, the cut-off point, performance wise, is around
* 4 64-byte blocks.
*/
cmp %o2, (4 * 64)
blu,pt %XCC, 75f
andcc GLOBAL_SPARE, 0x7, %g0
/* %o0: dst
* %o1: src
* %o2: len (known to be >= 128)
*
* The block copy loops can use %o4, %g2, %g3 as
* temporaries while copying the data. %o5 must
* be preserved between VISEntryHalf and VISExitHalf
*/
LOAD(prefetch, %o1 + 0x000, #one_read)
LOAD(prefetch, %o1 + 0x040, #one_read)
LOAD(prefetch, %o1 + 0x080, #one_read)
/* 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
2:
/* Clobbers o5/g1/g2/g3/g7/icc/xcc. We must preserve
* o5 from here until we hit VISExitHalf.
*/
VISEntryHalf
membar #Sync
alignaddr %o1, %g0, %g0
add %o1, (64 - 1), %o4
andn %o4, (64 - 1), %o4
andn %o2, (64 - 1), %g1
sub %o2, %g1, %o2
and %o1, (64 - 1), %g2
add %o1, %g1, %o1
sub %o0, %o4, %g3
brz,pt %g2, 190f
cmp %g2, 32
blu,a 5f
cmp %g2, 16
cmp %g2, 48
blu,a 4f
cmp %g2, 40
cmp %g2, 56
blu 170f
nop
ba,a,pt %xcc, 180f
4: /* 32 <= low bits < 48 */
blu 150f
nop
ba,a,pt %xcc, 160f
5: /* 0 < low bits < 32 */
blu,a 6f
cmp %g2, 8
cmp %g2, 24
blu 130f
nop
ba,a,pt %xcc, 140f
6: /* 0 < low bits < 16 */
bgeu 120f
nop
/* fall through for 0 < low bits < 8 */
110: sub %o4, 64, %g2
EX_LD(LOAD_BLK(%g2, %f0))
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f4, f6, f8, f10, f12, f14, f16)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_8(f16, f18, f20, f22, f24, f26, f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
120: sub %o4, 56, %g2
FREG_LOAD_7(%g2, f0, f2, f4, f6, f8, f10, f12)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f4, f6, f8, f10, f12, f16, f18)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_7(f18, f20, f22, f24, f26, f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
130: sub %o4, 48, %g2
FREG_LOAD_6(%g2, f0, f2, f4, f6, f8, f10)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f4, f6, f8, f10, f16, f18, f20)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_6(f20, f22, f24, f26, f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
140: sub %o4, 40, %g2
FREG_LOAD_5(%g2, f0, f2, f4, f6, f8)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f4, f6, f8, f16, f18, f20, f22)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_5(f22, f24, f26, f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
150: sub %o4, 32, %g2
FREG_LOAD_4(%g2, f0, f2, f4, f6)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f4, f6, f16, f18, f20, f22, f24)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_4(f24, f26, f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
160: sub %o4, 24, %g2
FREG_LOAD_3(%g2, f0, f2, f4)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f4, f16, f18, f20, f22, f24, f26)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_3(f26, f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
170: sub %o4, 16, %g2
FREG_LOAD_2(%g2, f0, f2)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f2, f16, f18, f20, f22, f24, f26, f28)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_2(f28, f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
180: sub %o4, 8, %g2
FREG_LOAD_1(%g2, f0)
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
EX_LD(LOAD_BLK(%o4, %f16))
FREG_FROB(f0, f16, f18, f20, f22, f24, f26, f28, f30)
EX_ST(STORE_BLK(%f0, %o4 + %g3))
FREG_MOVE_1(f30)
subcc %g1, 64, %g1
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
ba,pt %xcc, 195f
nop
190:
1: EX_ST(STORE_INIT(%g0, %o4 + %g3))
subcc %g1, 64, %g1
EX_LD(LOAD_BLK(%o4, %f0))
EX_ST(STORE_BLK(%f0, %o4 + %g3))
add %o4, 64, %o4
bne,pt %xcc, 1b
LOAD(prefetch, %o4 + 64, #one_read)
195:
add %o4, %g3, %o0
membar #Sync
VISExitHalf
/* %o2 contains any final bytes still needed to be copied
* over. If anything is left, we copy it one byte at a time.
*/
brz,pt %o2, 85f
sub %o0, %o1, GLOBAL_SPARE
ba,a,pt %XCC, 90f
.align 64
75: /* 16 < len <= 64 */
bne,pn %XCC, 75f
sub %o0, %o1, GLOBAL_SPARE
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 + GLOBAL_SPARE))
add %o1, 0x8, %o1
EX_ST(STORE(stx, %g1, %o1 + GLOBAL_SPARE))
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 + GLOBAL_SPARE))
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 + GLOBAL_SPARE))
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 + GLOBAL_SPARE))
bgu,pt %icc, 1b
add %o1, 1, %o1
2: add %o1, GLOBAL_SPARE, %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, GLOBAL_SPARE
andn %o1, 0x7, %o1
EX_LD(LOAD(ldx, %o1, %g2))
sub GLOBAL_SPARE, %g1, GLOBAL_SPARE
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, GLOBAL_SPARE, %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, GLOBAL_SPARE
.align 64
80: /* 0 < len <= 16 */
andcc GLOBAL_SPARE, 0x3, %g0
bne,pn %XCC, 90f
sub %o0, %o1, GLOBAL_SPARE
1:
subcc %o2, 4, %o2
EX_LD(LOAD(lduw, %o1, %g1))
EX_ST(STORE(stw, %g1, %o1 + GLOBAL_SPARE))
bgu,pt %XCC, 1b
add %o1, 4, %o1
85: retl
mov EX_RETVAL(%o3), %o0
.align 32
90:
subcc %o2, 1, %o2
EX_LD(LOAD(ldub, %o1, %g1))
EX_ST(STORE(stb, %g1, %o1 + GLOBAL_SPARE))
bgu,pt %XCC, 90b
add %o1, 1, %o1
retl
mov EX_RETVAL(%o3), %o0
.size FUNC_NAME, .-FUNC_NAME
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