+++ /dev/null
-/* NGmemcpy.S: Niagara optimized memcpy.
- *
- * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
- */
-
-#ifdef __KERNEL__
-#include <asm/asi.h>
-#include <asm/thread_info.h>
-#define GLOBAL_SPARE %g7
-#define RESTORE_ASI(TMP) \
- ldub [%g6 + TI_CURRENT_DS], TMP; \
- wr TMP, 0x0, %asi;
-#else
-#define GLOBAL_SPARE %g5
-#define RESTORE_ASI(TMP) \
- wr %g0, ASI_PNF, %asi
-#endif
-
-#ifdef __sparc_v9__
-#define SAVE_AMOUNT 128
-#else
-#define SAVE_AMOUNT 64
-#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
-#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
-#define STORE_INIT(src,addr) stxa src, [addr] %asi
-#else
-#define STORE_INIT(src,addr) stx src, [addr + 0x00]
-#endif
-#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: /* %i0=dst, %i1=src, %i2=len */
- PREAMBLE
- save %sp, -SAVE_AMOUNT, %sp
- srlx %i2, 31, %g2
- cmp %g2, 0
- tne %xcc, 5
- mov %i0, %o0
- cmp %i2, 0
- be,pn %XCC, 85f
- or %o0, %i1, %i3
- cmp %i2, 16
- blu,a,pn %XCC, 80f
- or %i3, %i2, %i3
-
- /* 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 %i2, (2 * 64)
- blu,pt %XCC, 70f
- andcc %i3, 0x7, %g0
-
- /* %o0: dst
- * %i1: src
- * %i2: len (known to be >= 128)
- *
- * The block copy loops will use %i4/%i5,%g2/%g3 as
- * temporaries while copying the data.
- */
-
- LOAD(prefetch, %i1, #one_read)
- wr %g0, STORE_ASI, %asi
-
- /* Align destination on 64-byte boundary. */
- andcc %o0, (64 - 1), %i4
- be,pt %XCC, 2f
- sub %i4, 64, %i4
- sub %g0, %i4, %i4 ! bytes to align dst
- sub %i2, %i4, %i2
-1: subcc %i4, 1, %i4
- EX_LD(LOAD(ldub, %i1, %g1))
- EX_ST(STORE(stb, %g1, %o0))
- add %i1, 1, %i1
- 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 %i1, (16 - 1), %i4
- andn %i2, (64 - 1), %g1 ! block copy loop iterator
- be,pt %XCC, 50f
- sub %i2, %g1, %i2 ! final sub-block copy bytes
-
- cmp %i4, 8
- be,pt %XCC, 10f
- sub %i1, %i4, %i1
-
- /* Neither 8-byte nor 16-byte aligned, shift and mask. */
- and %i4, 0x7, GLOBAL_SPARE
- sll GLOBAL_SPARE, 3, GLOBAL_SPARE
- mov 64, %i5
- EX_LD(LOAD_TWIN(%i1, %g2, %g3))
- sub %i5, GLOBAL_SPARE, %i5
- mov 16, %o4
- mov 32, %o5
- mov 48, %o7
- mov 64, %i3
-
- bg,pn %XCC, 9f
- nop
-
-#define MIX_THREE_WORDS(WORD1, WORD2, WORD3, PRE_SHIFT, POST_SHIFT, TMP) \
- sllx WORD1, POST_SHIFT, WORD1; \
- srlx WORD2, PRE_SHIFT, TMP; \
- sllx WORD2, POST_SHIFT, WORD2; \
- or WORD1, TMP, WORD1; \
- srlx WORD3, PRE_SHIFT, TMP; \
- or WORD2, TMP, WORD2;
-
-8: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))
- MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
- LOAD(prefetch, %i1 + %i3, #one_read)
-
- EX_ST(STORE_INIT(%g2, %o0 + 0x00))
- EX_ST(STORE_INIT(%g3, %o0 + 0x08))
-
- EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))
- MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)
-
- EX_ST(STORE_INIT(%o2, %o0 + 0x10))
- EX_ST(STORE_INIT(%o3, %o0 + 0x18))
-
- EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
- MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
-
- EX_ST(STORE_INIT(%g2, %o0 + 0x20))
- EX_ST(STORE_INIT(%g3, %o0 + 0x28))
-
- EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))
- add %i1, 64, %i1
- MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)
-
- EX_ST(STORE_INIT(%o2, %o0 + 0x30))
- EX_ST(STORE_INIT(%o3, %o0 + 0x38))
-
- subcc %g1, 64, %g1
- bne,pt %XCC, 8b
- add %o0, 64, %o0
-
- ba,pt %XCC, 60f
- add %i1, %i4, %i1
-
-9: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))
- MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
- LOAD(prefetch, %i1 + %i3, #one_read)
-
- EX_ST(STORE_INIT(%g3, %o0 + 0x00))
- EX_ST(STORE_INIT(%o2, %o0 + 0x08))
-
- EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))
- MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)
-
- EX_ST(STORE_INIT(%o3, %o0 + 0x10))
- EX_ST(STORE_INIT(%g2, %o0 + 0x18))
-
- EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
- MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
-
- EX_ST(STORE_INIT(%g3, %o0 + 0x20))
- EX_ST(STORE_INIT(%o2, %o0 + 0x28))
-
- EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))
- add %i1, 64, %i1
- MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)
-
- EX_ST(STORE_INIT(%o3, %o0 + 0x30))
- EX_ST(STORE_INIT(%g2, %o0 + 0x38))
-
- subcc %g1, 64, %g1
- bne,pt %XCC, 9b
- add %o0, 64, %o0
-
- ba,pt %XCC, 60f
- add %i1, %i4, %i1
-
-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(%i1, %o4, %o5))
- mov 16, %o7
- mov 32, %g2
- mov 48, %g3
- mov 64, %o1
-1: EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
- LOAD(prefetch, %i1 + %o1, #one_read)
- EX_ST(STORE_INIT(%o5, %o0 + 0x00)) ! initializes cache line
- EX_ST(STORE_INIT(%o2, %o0 + 0x08))
- EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))
- EX_ST(STORE_INIT(%o3, %o0 + 0x10))
- EX_ST(STORE_INIT(%o4, %o0 + 0x18))
- EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))
- EX_ST(STORE_INIT(%o5, %o0 + 0x20))
- EX_ST(STORE_INIT(%o2, %o0 + 0x28))
- EX_LD(LOAD_TWIN(%i1 + %o1, %o4, %o5))
- add %i1, 64, %i1
- EX_ST(STORE_INIT(%o3, %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 %i1, 0x8, %i1
-
-50: /* Destination is 64-byte aligned, and source is 16-byte
- * aligned.
- */
- mov 16, %o7
- mov 32, %g2
- mov 48, %g3
- mov 64, %o1
-1: EX_LD(LOAD_TWIN(%i1 + %g0, %o4, %o5))
- EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
- LOAD(prefetch, %i1 + %o1, #one_read)
- EX_ST(STORE_INIT(%o4, %o0 + 0x00)) ! initializes cache line
- EX_ST(STORE_INIT(%o5, %o0 + 0x08))
- EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))
- EX_ST(STORE_INIT(%o2, %o0 + 0x10))
- EX_ST(STORE_INIT(%o3, %o0 + 0x18))
- EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))
- add %i1, 64, %i1
- EX_ST(STORE_INIT(%o4, %o0 + 0x20))
- EX_ST(STORE_INIT(%o5, %o0 + 0x28))
- EX_ST(STORE_INIT(%o2, %o0 + 0x30))
- EX_ST(STORE_INIT(%o3, %o0 + 0x38))
- subcc %g1, 64, %g1
- bne,pt %XCC, 1b
- add %o0, 64, %o0
- /* fall through */
-
-60:
- membar #Sync
-
- /* %i2 contains any final bytes still needed to be copied
- * over. If anything is left, we copy it one byte at a time.
- */
- RESTORE_ASI(%i3)
- brz,pt %i2, 85f
- sub %o0, %i1, %i3
- ba,a,pt %XCC, 90f
-
- .align 64
-70: /* 16 < len <= 64 */
- bne,pn %XCC, 75f
- sub %o0, %i1, %i3
-
-72:
- andn %i2, 0xf, %i4
- and %i2, 0xf, %i2
-1: subcc %i4, 0x10, %i4
- EX_LD(LOAD(ldx, %i1, %o4))
- add %i1, 0x08, %i1
- EX_LD(LOAD(ldx, %i1, %g1))
- sub %i1, 0x08, %i1
- EX_ST(STORE(stx, %o4, %i1 + %i3))
- add %i1, 0x8, %i1
- EX_ST(STORE(stx, %g1, %i1 + %i3))
- bgu,pt %XCC, 1b
- add %i1, 0x8, %i1
-73: andcc %i2, 0x8, %g0
- be,pt %XCC, 1f
- nop
- sub %i2, 0x8, %i2
- EX_LD(LOAD(ldx, %i1, %o4))
- EX_ST(STORE(stx, %o4, %i1 + %i3))
- add %i1, 0x8, %i1
-1: andcc %i2, 0x4, %g0
- be,pt %XCC, 1f
- nop
- sub %i2, 0x4, %i2
- EX_LD(LOAD(lduw, %i1, %i5))
- EX_ST(STORE(stw, %i5, %i1 + %i3))
- add %i1, 0x4, %i1
-1: cmp %i2, 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 %i2, %g1, %i2
-
-1: subcc %g1, 1, %g1
- EX_LD(LOAD(ldub, %i1, %i5))
- EX_ST(STORE(stb, %i5, %i1 + %i3))
- bgu,pt %icc, 1b
- add %i1, 1, %i1
-
-2: add %i1, %i3, %o0
- andcc %i1, 0x7, %g1
- bne,pt %icc, 8f
- sll %g1, 3, %g1
-
- cmp %i2, 16
- bgeu,pt %icc, 72b
- nop
- ba,a,pt %xcc, 73b
-
-8: mov 64, %i3
- andn %i1, 0x7, %i1
- EX_LD(LOAD(ldx, %i1, %g2))
- sub %i3, %g1, %i3
- andn %i2, 0x7, %i4
- sllx %g2, %g1, %g2
-1: add %i1, 0x8, %i1
- EX_LD(LOAD(ldx, %i1, %g3))
- subcc %i4, 0x8, %i4
- srlx %g3, %i3, %i5
- or %i5, %g2, %i5
- EX_ST(STORE(stx, %i5, %o0))
- add %o0, 0x8, %o0
- bgu,pt %icc, 1b
- sllx %g3, %g1, %g2
-
- srl %g1, 3, %g1
- andcc %i2, 0x7, %i2
- be,pn %icc, 85f
- add %i1, %g1, %i1
- ba,pt %xcc, 90f
- sub %o0, %i1, %i3
-
- .align 64
-80: /* 0 < len <= 16 */
- andcc %i3, 0x3, %g0
- bne,pn %XCC, 90f
- sub %o0, %i1, %i3
-
-1:
- subcc %i2, 4, %i2
- EX_LD(LOAD(lduw, %i1, %g1))
- EX_ST(STORE(stw, %g1, %i1 + %i3))
- bgu,pt %XCC, 1b
- add %i1, 4, %i1
-
-85: ret
- restore EX_RETVAL(%i0), %g0, %o0
-
- .align 32
-90:
- subcc %i2, 1, %i2
- EX_LD(LOAD(ldub, %i1, %g1))
- EX_ST(STORE(stb, %g1, %i1 + %i3))
- bgu,pt %XCC, 90b
- add %i1, 1, %i1
- ret
- restore EX_RETVAL(%i0), %g0, %o0
-
- .size FUNC_NAME, .-FUNC_NAME
git.samba.org / sfrench / cifs-2.6.git / blobdiff