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/* 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
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