/* NGmemcpy.S: Niagara optimized memcpy. * * Copyright (C) 2006 David S. Miller (davem@davemloft.net) */ #ifdef __KERNEL__ #include #include #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 #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(%o3) 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