426 lines
9.4 KiB
ArmAsm
426 lines
9.4 KiB
ArmAsm
/* NGmemcpy.S: Niagara optimized memcpy.
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*
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* Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
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*/
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#ifdef __KERNEL__
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#include <asm/asi.h>
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#include <asm/thread_info.h>
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#define GLOBAL_SPARE %g7
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#define RESTORE_ASI(TMP) \
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ldub [%g6 + TI_CURRENT_DS], TMP; \
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wr TMP, 0x0, %asi;
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#else
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#define GLOBAL_SPARE %g5
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#define RESTORE_ASI(TMP) \
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wr %g0, ASI_PNF, %asi
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#endif
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#ifdef __sparc_v9__
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#define SAVE_AMOUNT 128
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#else
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#define SAVE_AMOUNT 64
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#endif
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#ifndef STORE_ASI
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#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P
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#endif
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#ifndef EX_LD
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#define EX_LD(x) x
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#endif
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#ifndef EX_ST
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#define EX_ST(x) x
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#endif
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#ifndef EX_RETVAL
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#define EX_RETVAL(x) x
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#endif
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#ifndef LOAD
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#ifndef MEMCPY_DEBUG
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#define LOAD(type,addr,dest) type [addr], dest
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#else
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#define LOAD(type,addr,dest) type##a [addr] 0x80, dest
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#endif
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#endif
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#ifndef LOAD_TWIN
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#define LOAD_TWIN(addr_reg,dest0,dest1) \
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ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_P, dest0
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#endif
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#ifndef STORE
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#define STORE(type,src,addr) type src, [addr]
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#endif
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#ifndef STORE_INIT
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#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
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#define STORE_INIT(src,addr) stxa src, [addr] %asi
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#else
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#define STORE_INIT(src,addr) stx src, [addr + 0x00]
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#endif
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#endif
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#ifndef FUNC_NAME
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#define FUNC_NAME NGmemcpy
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#endif
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#ifndef PREAMBLE
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#define PREAMBLE
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#endif
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#ifndef XCC
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#define XCC xcc
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#endif
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.register %g2,#scratch
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.register %g3,#scratch
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.text
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.align 64
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.globl FUNC_NAME
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.type FUNC_NAME,#function
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FUNC_NAME: /* %i0=dst, %i1=src, %i2=len */
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PREAMBLE
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save %sp, -SAVE_AMOUNT, %sp
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srlx %i2, 31, %g2
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cmp %g2, 0
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tne %xcc, 5
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mov %i0, %o0
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cmp %i2, 0
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be,pn %XCC, 85f
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or %o0, %i1, %i3
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cmp %i2, 16
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blu,a,pn %XCC, 80f
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or %i3, %i2, %i3
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/* 2 blocks (128 bytes) is the minimum we can do the block
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* copy with. We need to ensure that we'll iterate at least
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* once in the block copy loop. At worst we'll need to align
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* the destination to a 64-byte boundary which can chew up
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* to (64 - 1) bytes from the length before we perform the
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* block copy loop.
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*/
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cmp %i2, (2 * 64)
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blu,pt %XCC, 70f
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andcc %i3, 0x7, %g0
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/* %o0: dst
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* %i1: src
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* %i2: len (known to be >= 128)
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*
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* The block copy loops will use %i4/%i5,%g2/%g3 as
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* temporaries while copying the data.
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*/
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LOAD(prefetch, %i1, #one_read)
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wr %g0, STORE_ASI, %asi
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/* Align destination on 64-byte boundary. */
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andcc %o0, (64 - 1), %i4
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be,pt %XCC, 2f
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sub %i4, 64, %i4
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sub %g0, %i4, %i4 ! bytes to align dst
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sub %i2, %i4, %i2
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1: subcc %i4, 1, %i4
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EX_LD(LOAD(ldub, %i1, %g1))
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EX_ST(STORE(stb, %g1, %o0))
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add %i1, 1, %i1
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bne,pt %XCC, 1b
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add %o0, 1, %o0
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/* If the source is on a 16-byte boundary we can do
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* the direct block copy loop. If it is 8-byte aligned
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* we can do the 16-byte loads offset by -8 bytes and the
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* init stores offset by one register.
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*
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* If the source is not even 8-byte aligned, we need to do
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* shifting and masking (basically integer faligndata).
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*
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* The careful bit with init stores is that if we store
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* to any part of the cache line we have to store the whole
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* cacheline else we can end up with corrupt L2 cache line
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* contents. Since the loop works on 64-bytes of 64-byte
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* aligned store data at a time, this is easy to ensure.
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*/
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2:
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andcc %i1, (16 - 1), %i4
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andn %i2, (64 - 1), %g1 ! block copy loop iterator
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be,pt %XCC, 50f
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sub %i2, %g1, %i2 ! final sub-block copy bytes
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cmp %i4, 8
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be,pt %XCC, 10f
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sub %i1, %i4, %i1
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/* Neither 8-byte nor 16-byte aligned, shift and mask. */
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and %i4, 0x7, GLOBAL_SPARE
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sll GLOBAL_SPARE, 3, GLOBAL_SPARE
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mov 64, %i5
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EX_LD(LOAD_TWIN(%i1, %g2, %g3))
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sub %i5, GLOBAL_SPARE, %i5
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mov 16, %o4
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mov 32, %o5
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mov 48, %o7
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mov 64, %i3
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bg,pn %XCC, 9f
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nop
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#define MIX_THREE_WORDS(WORD1, WORD2, WORD3, PRE_SHIFT, POST_SHIFT, TMP) \
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sllx WORD1, POST_SHIFT, WORD1; \
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srlx WORD2, PRE_SHIFT, TMP; \
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sllx WORD2, POST_SHIFT, WORD2; \
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or WORD1, TMP, WORD1; \
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srlx WORD3, PRE_SHIFT, TMP; \
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or WORD2, TMP, WORD2;
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8: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))
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MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
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LOAD(prefetch, %i1 + %i3, #one_read)
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EX_ST(STORE_INIT(%g2, %o0 + 0x00))
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EX_ST(STORE_INIT(%g3, %o0 + 0x08))
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EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))
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MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)
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EX_ST(STORE_INIT(%o2, %o0 + 0x10))
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EX_ST(STORE_INIT(%o3, %o0 + 0x18))
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EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
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MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
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EX_ST(STORE_INIT(%g2, %o0 + 0x20))
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EX_ST(STORE_INIT(%g3, %o0 + 0x28))
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EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))
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add %i1, 64, %i1
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MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)
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EX_ST(STORE_INIT(%o2, %o0 + 0x30))
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EX_ST(STORE_INIT(%o3, %o0 + 0x38))
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subcc %g1, 64, %g1
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bne,pt %XCC, 8b
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add %o0, 64, %o0
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ba,pt %XCC, 60f
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add %i1, %i4, %i1
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9: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))
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MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
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LOAD(prefetch, %i1 + %i3, #one_read)
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EX_ST(STORE_INIT(%g3, %o0 + 0x00))
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EX_ST(STORE_INIT(%o2, %o0 + 0x08))
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EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))
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MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)
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EX_ST(STORE_INIT(%o3, %o0 + 0x10))
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EX_ST(STORE_INIT(%g2, %o0 + 0x18))
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EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
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MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
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EX_ST(STORE_INIT(%g3, %o0 + 0x20))
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EX_ST(STORE_INIT(%o2, %o0 + 0x28))
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EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))
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add %i1, 64, %i1
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MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)
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EX_ST(STORE_INIT(%o3, %o0 + 0x30))
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EX_ST(STORE_INIT(%g2, %o0 + 0x38))
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subcc %g1, 64, %g1
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bne,pt %XCC, 9b
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add %o0, 64, %o0
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ba,pt %XCC, 60f
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add %i1, %i4, %i1
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10: /* Destination is 64-byte aligned, source was only 8-byte
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* aligned but it has been subtracted by 8 and we perform
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* one twin load ahead, then add 8 back into source when
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* we finish the loop.
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*/
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EX_LD(LOAD_TWIN(%i1, %o4, %o5))
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mov 16, %o7
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mov 32, %g2
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mov 48, %g3
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mov 64, %o1
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1: EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
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LOAD(prefetch, %i1 + %o1, #one_read)
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EX_ST(STORE_INIT(%o5, %o0 + 0x00)) ! initializes cache line
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EX_ST(STORE_INIT(%o2, %o0 + 0x08))
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EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))
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EX_ST(STORE_INIT(%o3, %o0 + 0x10))
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EX_ST(STORE_INIT(%o4, %o0 + 0x18))
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EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))
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EX_ST(STORE_INIT(%o5, %o0 + 0x20))
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EX_ST(STORE_INIT(%o2, %o0 + 0x28))
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EX_LD(LOAD_TWIN(%i1 + %o1, %o4, %o5))
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add %i1, 64, %i1
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EX_ST(STORE_INIT(%o3, %o0 + 0x30))
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EX_ST(STORE_INIT(%o4, %o0 + 0x38))
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subcc %g1, 64, %g1
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bne,pt %XCC, 1b
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add %o0, 64, %o0
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ba,pt %XCC, 60f
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add %i1, 0x8, %i1
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50: /* Destination is 64-byte aligned, and source is 16-byte
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* aligned.
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*/
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mov 16, %o7
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mov 32, %g2
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mov 48, %g3
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mov 64, %o1
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1: EX_LD(LOAD_TWIN(%i1 + %g0, %o4, %o5))
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EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
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LOAD(prefetch, %i1 + %o1, #one_read)
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EX_ST(STORE_INIT(%o4, %o0 + 0x00)) ! initializes cache line
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EX_ST(STORE_INIT(%o5, %o0 + 0x08))
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EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))
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EX_ST(STORE_INIT(%o2, %o0 + 0x10))
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EX_ST(STORE_INIT(%o3, %o0 + 0x18))
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EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))
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add %i1, 64, %i1
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EX_ST(STORE_INIT(%o4, %o0 + 0x20))
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EX_ST(STORE_INIT(%o5, %o0 + 0x28))
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EX_ST(STORE_INIT(%o2, %o0 + 0x30))
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EX_ST(STORE_INIT(%o3, %o0 + 0x38))
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subcc %g1, 64, %g1
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bne,pt %XCC, 1b
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add %o0, 64, %o0
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/* fall through */
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60:
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membar #Sync
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/* %i2 contains any final bytes still needed to be copied
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* over. If anything is left, we copy it one byte at a time.
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*/
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RESTORE_ASI(%i3)
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brz,pt %i2, 85f
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sub %o0, %i1, %i3
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ba,a,pt %XCC, 90f
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.align 64
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70: /* 16 < len <= 64 */
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bne,pn %XCC, 75f
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sub %o0, %i1, %i3
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72:
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andn %i2, 0xf, %i4
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and %i2, 0xf, %i2
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1: subcc %i4, 0x10, %i4
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EX_LD(LOAD(ldx, %i1, %o4))
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add %i1, 0x08, %i1
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EX_LD(LOAD(ldx, %i1, %g1))
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sub %i1, 0x08, %i1
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EX_ST(STORE(stx, %o4, %i1 + %i3))
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add %i1, 0x8, %i1
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EX_ST(STORE(stx, %g1, %i1 + %i3))
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bgu,pt %XCC, 1b
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add %i1, 0x8, %i1
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73: andcc %i2, 0x8, %g0
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be,pt %XCC, 1f
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nop
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sub %i2, 0x8, %i2
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EX_LD(LOAD(ldx, %i1, %o4))
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EX_ST(STORE(stx, %o4, %i1 + %i3))
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add %i1, 0x8, %i1
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1: andcc %i2, 0x4, %g0
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be,pt %XCC, 1f
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nop
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sub %i2, 0x4, %i2
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EX_LD(LOAD(lduw, %i1, %i5))
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EX_ST(STORE(stw, %i5, %i1 + %i3))
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add %i1, 0x4, %i1
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1: cmp %i2, 0
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be,pt %XCC, 85f
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nop
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ba,pt %xcc, 90f
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nop
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75:
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andcc %o0, 0x7, %g1
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sub %g1, 0x8, %g1
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be,pn %icc, 2f
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sub %g0, %g1, %g1
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sub %i2, %g1, %i2
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1: subcc %g1, 1, %g1
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EX_LD(LOAD(ldub, %i1, %i5))
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EX_ST(STORE(stb, %i5, %i1 + %i3))
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bgu,pt %icc, 1b
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add %i1, 1, %i1
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2: add %i1, %i3, %o0
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andcc %i1, 0x7, %g1
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bne,pt %icc, 8f
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sll %g1, 3, %g1
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cmp %i2, 16
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bgeu,pt %icc, 72b
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nop
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ba,a,pt %xcc, 73b
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8: mov 64, %i3
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andn %i1, 0x7, %i1
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EX_LD(LOAD(ldx, %i1, %g2))
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sub %i3, %g1, %i3
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andn %i2, 0x7, %i4
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sllx %g2, %g1, %g2
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1: add %i1, 0x8, %i1
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EX_LD(LOAD(ldx, %i1, %g3))
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subcc %i4, 0x8, %i4
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srlx %g3, %i3, %i5
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or %i5, %g2, %i5
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EX_ST(STORE(stx, %i5, %o0))
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add %o0, 0x8, %o0
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bgu,pt %icc, 1b
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sllx %g3, %g1, %g2
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srl %g1, 3, %g1
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andcc %i2, 0x7, %i2
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be,pn %icc, 85f
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add %i1, %g1, %i1
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ba,pt %xcc, 90f
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sub %o0, %i1, %i3
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.align 64
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80: /* 0 < len <= 16 */
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andcc %i3, 0x3, %g0
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bne,pn %XCC, 90f
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sub %o0, %i1, %i3
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1:
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subcc %i2, 4, %i2
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EX_LD(LOAD(lduw, %i1, %g1))
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EX_ST(STORE(stw, %g1, %i1 + %i3))
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bgu,pt %XCC, 1b
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add %i1, 4, %i1
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85: ret
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restore EX_RETVAL(%i0), %g0, %o0
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.align 32
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90:
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subcc %i2, 1, %i2
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EX_LD(LOAD(ldub, %i1, %g1))
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EX_ST(STORE(stb, %g1, %i1 + %i3))
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bgu,pt %XCC, 90b
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add %i1, 1, %i1
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ret
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restore EX_RETVAL(%i0), %g0, %o0
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.size FUNC_NAME, .-FUNC_NAME
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