| /* NG4memcpy.S: Niagara-4 optimized memcpy. |
| * |
| * Copyright (C) 2012 David S. Miller (davem@davemloft.net) |
| */ |
| |
| #ifdef __KERNEL__ |
| #include <asm/visasm.h> |
| #include <asm/asi.h> |
| #define GLOBAL_SPARE %g7 |
| #else |
| #define ASI_BLK_INIT_QUAD_LDD_P 0xe2 |
| #define FPRS_FEF 0x04 |
| |
| /* On T4 it is very expensive to access ASRs like %fprs and |
| * %asi, avoiding a read or a write can save ~50 cycles. |
| */ |
| #define FPU_ENTER \ |
| rd %fprs, %o5; \ |
| andcc %o5, FPRS_FEF, %g0; \ |
| be,a,pn %icc, 999f; \ |
| wr %g0, FPRS_FEF, %fprs; \ |
| 999: |
| |
| #ifdef MEMCPY_DEBUG |
| #define VISEntryHalf FPU_ENTER; \ |
| 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 FPU_ENTER |
| #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 |
| |
| #if !defined(EX_LD) && !defined(EX_ST) |
| #define NON_USER_COPY |
| #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 STORE |
| #ifndef MEMCPY_DEBUG |
| #define STORE(type,src,addr) type src, [addr] |
| #else |
| #define STORE(type,src,addr) type##a src, [addr] %asi |
| #endif |
| #endif |
| |
| #ifndef STORE_INIT |
| #define STORE_INIT(src,addr) stxa src, [addr] STORE_ASI |
| #endif |
| |
| #ifndef FUNC_NAME |
| #define FUNC_NAME NG4memcpy |
| #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 */ |
| #ifdef MEMCPY_DEBUG |
| wr %g0, 0x80, %asi |
| #endif |
| srlx %o2, 31, %g2 |
| cmp %g2, 0 |
| tne %XCC, 5 |
| PREAMBLE |
| mov %o0, %o3 |
| brz,pn %o2, .Lexit |
| cmp %o2, 3 |
| ble,pn %icc, .Ltiny |
| cmp %o2, 19 |
| ble,pn %icc, .Lsmall |
| or %o0, %o1, %g2 |
| cmp %o2, 128 |
| bl,pn %icc, .Lmedium |
| nop |
| |
| .Llarge:/* len >= 0x80 */ |
| /* First get dest 8 byte aligned. */ |
| sub %g0, %o0, %g1 |
| and %g1, 0x7, %g1 |
| brz,pt %g1, 51f |
| sub %o2, %g1, %o2 |
| |
| 1: EX_LD(LOAD(ldub, %o1 + 0x00, %g2)) |
| add %o1, 1, %o1 |
| subcc %g1, 1, %g1 |
| add %o0, 1, %o0 |
| bne,pt %icc, 1b |
| EX_ST(STORE(stb, %g2, %o0 - 0x01)) |
| |
| 51: LOAD(prefetch, %o1 + 0x040, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x080, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x0c0, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x100, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x140, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x180, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x1c0, #n_reads_strong) |
| LOAD(prefetch, %o1 + 0x200, #n_reads_strong) |
| |
| /* Check if we can use the straight fully aligned |
| * loop, or we require the alignaddr/faligndata variant. |
| */ |
| andcc %o1, 0x7, %o5 |
| bne,pn %icc, .Llarge_src_unaligned |
| sub %g0, %o0, %g1 |
| |
| /* Legitimize the use of initializing stores by getting dest |
| * to be 64-byte aligned. |
| */ |
| and %g1, 0x3f, %g1 |
| brz,pt %g1, .Llarge_aligned |
| sub %o2, %g1, %o2 |
| |
| 1: EX_LD(LOAD(ldx, %o1 + 0x00, %g2)) |
| add %o1, 8, %o1 |
| subcc %g1, 8, %g1 |
| add %o0, 8, %o0 |
| bne,pt %icc, 1b |
| EX_ST(STORE(stx, %g2, %o0 - 0x08)) |
| |
| .Llarge_aligned: |
| /* len >= 0x80 && src 8-byte aligned && dest 8-byte aligned */ |
| andn %o2, 0x3f, %o4 |
| sub %o2, %o4, %o2 |
| |
| 1: EX_LD(LOAD(ldx, %o1 + 0x00, %g1)) |
| add %o1, 0x40, %o1 |
| EX_LD(LOAD(ldx, %o1 - 0x38, %g2)) |
| subcc %o4, 0x40, %o4 |
| EX_LD(LOAD(ldx, %o1 - 0x30, %g3)) |
| EX_LD(LOAD(ldx, %o1 - 0x28, GLOBAL_SPARE)) |
| EX_LD(LOAD(ldx, %o1 - 0x20, %o5)) |
| EX_ST(STORE_INIT(%g1, %o0)) |
| add %o0, 0x08, %o0 |
| EX_ST(STORE_INIT(%g2, %o0)) |
| add %o0, 0x08, %o0 |
| EX_LD(LOAD(ldx, %o1 - 0x18, %g2)) |
| EX_ST(STORE_INIT(%g3, %o0)) |
| add %o0, 0x08, %o0 |
| EX_LD(LOAD(ldx, %o1 - 0x10, %g3)) |
| EX_ST(STORE_INIT(GLOBAL_SPARE, %o0)) |
| add %o0, 0x08, %o0 |
| EX_LD(LOAD(ldx, %o1 - 0x08, GLOBAL_SPARE)) |
| EX_ST(STORE_INIT(%o5, %o0)) |
| add %o0, 0x08, %o0 |
| EX_ST(STORE_INIT(%g2, %o0)) |
| add %o0, 0x08, %o0 |
| EX_ST(STORE_INIT(%g3, %o0)) |
| add %o0, 0x08, %o0 |
| EX_ST(STORE_INIT(GLOBAL_SPARE, %o0)) |
| add %o0, 0x08, %o0 |
| bne,pt %icc, 1b |
| LOAD(prefetch, %o1 + 0x200, #n_reads_strong) |
| |
| membar #StoreLoad | #StoreStore |
| |
| brz,pn %o2, .Lexit |
| cmp %o2, 19 |
| ble,pn %icc, .Lsmall_unaligned |
| nop |
| ba,a,pt %icc, .Lmedium_noprefetch |
| |
| .Lexit: retl |
| mov EX_RETVAL(%o3), %o0 |
| |
| .Llarge_src_unaligned: |
| #ifdef NON_USER_COPY |
| VISEntryHalfFast(.Lmedium_vis_entry_fail) |
| #else |
| VISEntryHalf |
| #endif |
| andn %o2, 0x3f, %o4 |
| sub %o2, %o4, %o2 |
| alignaddr %o1, %g0, %g1 |
| add %o1, %o4, %o1 |
| EX_LD(LOAD(ldd, %g1 + 0x00, %f0)) |
| 1: EX_LD(LOAD(ldd, %g1 + 0x08, %f2)) |
| subcc %o4, 0x40, %o4 |
| EX_LD(LOAD(ldd, %g1 + 0x10, %f4)) |
| EX_LD(LOAD(ldd, %g1 + 0x18, %f6)) |
| EX_LD(LOAD(ldd, %g1 + 0x20, %f8)) |
| EX_LD(LOAD(ldd, %g1 + 0x28, %f10)) |
| EX_LD(LOAD(ldd, %g1 + 0x30, %f12)) |
| EX_LD(LOAD(ldd, %g1 + 0x38, %f14)) |
| faligndata %f0, %f2, %f16 |
| EX_LD(LOAD(ldd, %g1 + 0x40, %f0)) |
| faligndata %f2, %f4, %f18 |
| add %g1, 0x40, %g1 |
| faligndata %f4, %f6, %f20 |
| faligndata %f6, %f8, %f22 |
| faligndata %f8, %f10, %f24 |
| faligndata %f10, %f12, %f26 |
| faligndata %f12, %f14, %f28 |
| faligndata %f14, %f0, %f30 |
| EX_ST(STORE(std, %f16, %o0 + 0x00)) |
| EX_ST(STORE(std, %f18, %o0 + 0x08)) |
| EX_ST(STORE(std, %f20, %o0 + 0x10)) |
| EX_ST(STORE(std, %f22, %o0 + 0x18)) |
| EX_ST(STORE(std, %f24, %o0 + 0x20)) |
| EX_ST(STORE(std, %f26, %o0 + 0x28)) |
| EX_ST(STORE(std, %f28, %o0 + 0x30)) |
| EX_ST(STORE(std, %f30, %o0 + 0x38)) |
| add %o0, 0x40, %o0 |
| bne,pt %icc, 1b |
| LOAD(prefetch, %g1 + 0x200, #n_reads_strong) |
| VISExitHalf |
| |
| brz,pn %o2, .Lexit |
| cmp %o2, 19 |
| ble,pn %icc, .Lsmall_unaligned |
| nop |
| ba,a,pt %icc, .Lmedium_unaligned |
| |
| #ifdef NON_USER_COPY |
| .Lmedium_vis_entry_fail: |
| or %o0, %o1, %g2 |
| #endif |
| .Lmedium: |
| LOAD(prefetch, %o1 + 0x40, #n_reads_strong) |
| andcc %g2, 0x7, %g0 |
| bne,pn %icc, .Lmedium_unaligned |
| nop |
| .Lmedium_noprefetch: |
| andncc %o2, 0x20 - 1, %o5 |
| be,pn %icc, 2f |
| sub %o2, %o5, %o2 |
| 1: EX_LD(LOAD(ldx, %o1 + 0x00, %g1)) |
| EX_LD(LOAD(ldx, %o1 + 0x08, %g2)) |
| EX_LD(LOAD(ldx, %o1 + 0x10, GLOBAL_SPARE)) |
| EX_LD(LOAD(ldx, %o1 + 0x18, %o4)) |
| add %o1, 0x20, %o1 |
| subcc %o5, 0x20, %o5 |
| EX_ST(STORE(stx, %g1, %o0 + 0x00)) |
| EX_ST(STORE(stx, %g2, %o0 + 0x08)) |
| EX_ST(STORE(stx, GLOBAL_SPARE, %o0 + 0x10)) |
| EX_ST(STORE(stx, %o4, %o0 + 0x18)) |
| bne,pt %icc, 1b |
| add %o0, 0x20, %o0 |
| 2: andcc %o2, 0x18, %o5 |
| be,pt %icc, 3f |
| sub %o2, %o5, %o2 |
| 1: EX_LD(LOAD(ldx, %o1 + 0x00, %g1)) |
| add %o1, 0x08, %o1 |
| add %o0, 0x08, %o0 |
| subcc %o5, 0x08, %o5 |
| bne,pt %icc, 1b |
| EX_ST(STORE(stx, %g1, %o0 - 0x08)) |
| 3: brz,pt %o2, .Lexit |
| cmp %o2, 0x04 |
| bl,pn %icc, .Ltiny |
| nop |
| EX_LD(LOAD(lduw, %o1 + 0x00, %g1)) |
| add %o1, 0x04, %o1 |
| add %o0, 0x04, %o0 |
| subcc %o2, 0x04, %o2 |
| bne,pn %icc, .Ltiny |
| EX_ST(STORE(stw, %g1, %o0 - 0x04)) |
| ba,a,pt %icc, .Lexit |
| .Lmedium_unaligned: |
| /* First get dest 8 byte aligned. */ |
| sub %g0, %o0, %g1 |
| and %g1, 0x7, %g1 |
| brz,pt %g1, 2f |
| sub %o2, %g1, %o2 |
| |
| 1: EX_LD(LOAD(ldub, %o1 + 0x00, %g2)) |
| add %o1, 1, %o1 |
| subcc %g1, 1, %g1 |
| add %o0, 1, %o0 |
| bne,pt %icc, 1b |
| EX_ST(STORE(stb, %g2, %o0 - 0x01)) |
| 2: |
| and %o1, 0x7, %g1 |
| brz,pn %g1, .Lmedium_noprefetch |
| sll %g1, 3, %g1 |
| mov 64, %g2 |
| sub %g2, %g1, %g2 |
| andn %o1, 0x7, %o1 |
| EX_LD(LOAD(ldx, %o1 + 0x00, %o4)) |
| sllx %o4, %g1, %o4 |
| andn %o2, 0x08 - 1, %o5 |
| sub %o2, %o5, %o2 |
| 1: EX_LD(LOAD(ldx, %o1 + 0x08, %g3)) |
| add %o1, 0x08, %o1 |
| subcc %o5, 0x08, %o5 |
| srlx %g3, %g2, GLOBAL_SPARE |
| or GLOBAL_SPARE, %o4, GLOBAL_SPARE |
| EX_ST(STORE(stx, GLOBAL_SPARE, %o0 + 0x00)) |
| add %o0, 0x08, %o0 |
| bne,pt %icc, 1b |
| sllx %g3, %g1, %o4 |
| srl %g1, 3, %g1 |
| add %o1, %g1, %o1 |
| brz,pn %o2, .Lexit |
| nop |
| ba,pt %icc, .Lsmall_unaligned |
| |
| .Ltiny: |
| EX_LD(LOAD(ldub, %o1 + 0x00, %g1)) |
| subcc %o2, 1, %o2 |
| be,pn %icc, .Lexit |
| EX_ST(STORE(stb, %g1, %o0 + 0x00)) |
| EX_LD(LOAD(ldub, %o1 + 0x01, %g1)) |
| subcc %o2, 1, %o2 |
| be,pn %icc, .Lexit |
| EX_ST(STORE(stb, %g1, %o0 + 0x01)) |
| EX_LD(LOAD(ldub, %o1 + 0x02, %g1)) |
| ba,pt %icc, .Lexit |
| EX_ST(STORE(stb, %g1, %o0 + 0x02)) |
| |
| .Lsmall: |
| andcc %g2, 0x3, %g0 |
| bne,pn %icc, .Lsmall_unaligned |
| andn %o2, 0x4 - 1, %o5 |
| sub %o2, %o5, %o2 |
| 1: |
| EX_LD(LOAD(lduw, %o1 + 0x00, %g1)) |
| add %o1, 0x04, %o1 |
| subcc %o5, 0x04, %o5 |
| add %o0, 0x04, %o0 |
| bne,pt %icc, 1b |
| EX_ST(STORE(stw, %g1, %o0 - 0x04)) |
| brz,pt %o2, .Lexit |
| nop |
| ba,a,pt %icc, .Ltiny |
| |
| .Lsmall_unaligned: |
| 1: EX_LD(LOAD(ldub, %o1 + 0x00, %g1)) |
| add %o1, 1, %o1 |
| add %o0, 1, %o0 |
| subcc %o2, 1, %o2 |
| bne,pt %icc, 1b |
| EX_ST(STORE(stb, %g1, %o0 - 0x01)) |
| ba,a,pt %icc, .Lexit |
| .size FUNC_NAME, .-FUNC_NAME |
