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Diffstat (limited to 'arch/tile/lib/memcpy_64.c')
-rw-r--r--arch/tile/lib/memcpy_64.c367
1 files changed, 0 insertions, 367 deletions
diff --git a/arch/tile/lib/memcpy_64.c b/arch/tile/lib/memcpy_64.c
deleted file mode 100644
index 4815354b8cd2..000000000000
--- a/arch/tile/lib/memcpy_64.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/module.h>
-/* EXPORT_SYMBOL() is in arch/tile/lib/exports.c since this should be asm. */
-
-/* Must be 8 bytes in size. */
-#define op_t uint64_t
-
-/* Threshold value for when to enter the unrolled loops. */
-#define OP_T_THRES 16
-
-#if CHIP_L2_LINE_SIZE() != 64
-#error "Assumes 64 byte line size"
-#endif
-
-/* How many cache lines ahead should we prefetch? */
-#define PREFETCH_LINES_AHEAD 4
-
-/*
- * Provide "base versions" of load and store for the normal code path.
- * The kernel provides other versions for userspace copies.
- */
-#define ST(p, v) (*(p) = (v))
-#define LD(p) (*(p))
-
-#ifndef USERCOPY_FUNC
-#define ST1 ST
-#define ST2 ST
-#define ST4 ST
-#define ST8 ST
-#define LD1 LD
-#define LD2 LD
-#define LD4 LD
-#define LD8 LD
-#define RETVAL dstv
-void *memcpy(void *__restrict dstv, const void *__restrict srcv, size_t n)
-#else
-/*
- * Special kernel version will provide implementation of the LDn/STn
- * macros to return a count of uncopied bytes due to mm fault.
- */
-#define RETVAL 0
-int __attribute__((optimize("omit-frame-pointer")))
-USERCOPY_FUNC(void *__restrict dstv, const void *__restrict srcv, size_t n)
-#endif
-{
- char *__restrict dst1 = (char *)dstv;
- const char *__restrict src1 = (const char *)srcv;
- const char *__restrict src1_end;
- const char *__restrict prefetch;
- op_t *__restrict dst8; /* 8-byte pointer to destination memory. */
- op_t final; /* Final bytes to write to trailing word, if any */
- long i;
-
- if (n < 16) {
- for (; n; n--)
- ST1(dst1++, LD1(src1++));
- return RETVAL;
- }
-
- /*
- * Locate the end of source memory we will copy. Don't
- * prefetch past this.
- */
- src1_end = src1 + n - 1;
-
- /* Prefetch ahead a few cache lines, but not past the end. */
- prefetch = src1;
- for (i = 0; i < PREFETCH_LINES_AHEAD; i++) {
- __insn_prefetch(prefetch);
- prefetch += CHIP_L2_LINE_SIZE();
- prefetch = (prefetch < src1_end) ? prefetch : src1;
- }
-
- /* Copy bytes until dst is word-aligned. */
- for (; (uintptr_t)dst1 & (sizeof(op_t) - 1); n--)
- ST1(dst1++, LD1(src1++));
-
- /* 8-byte pointer to destination memory. */
- dst8 = (op_t *)dst1;
-
- if (__builtin_expect((uintptr_t)src1 & (sizeof(op_t) - 1), 0)) {
- /* Unaligned copy. */
-
- op_t tmp0 = 0, tmp1 = 0, tmp2, tmp3;
- const op_t *src8 = (const op_t *) ((uintptr_t)src1 &
- -sizeof(op_t));
- const void *srci = (void *)src1;
- int m;
-
- m = (CHIP_L2_LINE_SIZE() << 2) -
- (((uintptr_t)dst8) & ((CHIP_L2_LINE_SIZE() << 2) - 1));
- m = (n < m) ? n : m;
- m /= sizeof(op_t);
-
- /* Copy until 'dst' is cache-line-aligned. */
- n -= (sizeof(op_t) * m);
-
- switch (m % 4) {
- case 0:
- if (__builtin_expect(!m, 0))
- goto _M0;
- tmp1 = LD8(src8++);
- tmp2 = LD8(src8++);
- goto _8B3;
- case 2:
- m += 2;
- tmp3 = LD8(src8++);
- tmp0 = LD8(src8++);
- goto _8B1;
- case 3:
- m += 1;
- tmp2 = LD8(src8++);
- tmp3 = LD8(src8++);
- goto _8B2;
- case 1:
- m--;
- tmp0 = LD8(src8++);
- tmp1 = LD8(src8++);
- if (__builtin_expect(!m, 0))
- goto _8B0;
- }
-
- do {
- tmp2 = LD8(src8++);
- tmp0 = __insn_dblalign(tmp0, tmp1, srci);
- ST8(dst8++, tmp0);
-_8B3:
- tmp3 = LD8(src8++);
- tmp1 = __insn_dblalign(tmp1, tmp2, srci);
- ST8(dst8++, tmp1);
-_8B2:
- tmp0 = LD8(src8++);
- tmp2 = __insn_dblalign(tmp2, tmp3, srci);
- ST8(dst8++, tmp2);
-_8B1:
- tmp1 = LD8(src8++);
- tmp3 = __insn_dblalign(tmp3, tmp0, srci);
- ST8(dst8++, tmp3);
- m -= 4;
- } while (m);
-
-_8B0:
- tmp0 = __insn_dblalign(tmp0, tmp1, srci);
- ST8(dst8++, tmp0);
- src8--;
-
-_M0:
- if (__builtin_expect(n >= CHIP_L2_LINE_SIZE(), 0)) {
- op_t tmp4, tmp5, tmp6, tmp7, tmp8;
-
- prefetch = ((const char *)src8) +
- CHIP_L2_LINE_SIZE() * PREFETCH_LINES_AHEAD;
-
- for (tmp0 = LD8(src8++); n >= CHIP_L2_LINE_SIZE();
- n -= CHIP_L2_LINE_SIZE()) {
- /* Prefetch and advance to next line to
- prefetch, but don't go past the end. */
- __insn_prefetch(prefetch);
-
- /* Make sure prefetch got scheduled
- earlier. */
- __asm__ ("" : : : "memory");
-
- prefetch += CHIP_L2_LINE_SIZE();
- prefetch = (prefetch < src1_end) ? prefetch :
- (const char *) src8;
-
- tmp1 = LD8(src8++);
- tmp2 = LD8(src8++);
- tmp3 = LD8(src8++);
- tmp4 = LD8(src8++);
- tmp5 = LD8(src8++);
- tmp6 = LD8(src8++);
- tmp7 = LD8(src8++);
- tmp8 = LD8(src8++);
-
- tmp0 = __insn_dblalign(tmp0, tmp1, srci);
- tmp1 = __insn_dblalign(tmp1, tmp2, srci);
- tmp2 = __insn_dblalign(tmp2, tmp3, srci);
- tmp3 = __insn_dblalign(tmp3, tmp4, srci);
- tmp4 = __insn_dblalign(tmp4, tmp5, srci);
- tmp5 = __insn_dblalign(tmp5, tmp6, srci);
- tmp6 = __insn_dblalign(tmp6, tmp7, srci);
- tmp7 = __insn_dblalign(tmp7, tmp8, srci);
-
- __insn_wh64(dst8);
-
- ST8(dst8++, tmp0);
- ST8(dst8++, tmp1);
- ST8(dst8++, tmp2);
- ST8(dst8++, tmp3);
- ST8(dst8++, tmp4);
- ST8(dst8++, tmp5);
- ST8(dst8++, tmp6);
- ST8(dst8++, tmp7);
-
- tmp0 = tmp8;
- }
- src8--;
- }
-
- /* Copy the rest 8-byte chunks. */
- if (n >= sizeof(op_t)) {
- tmp0 = LD8(src8++);
- for (; n >= sizeof(op_t); n -= sizeof(op_t)) {
- tmp1 = LD8(src8++);
- tmp0 = __insn_dblalign(tmp0, tmp1, srci);
- ST8(dst8++, tmp0);
- tmp0 = tmp1;
- }
- src8--;
- }
-
- if (n == 0)
- return RETVAL;
-
- tmp0 = LD8(src8++);
- tmp1 = ((const char *)src8 <= src1_end)
- ? LD8((op_t *)src8) : 0;
- final = __insn_dblalign(tmp0, tmp1, srci);
-
- } else {
- /* Aligned copy. */
-
- const op_t *__restrict src8 = (const op_t *)src1;
-
- /* src8 and dst8 are both word-aligned. */
- if (n >= CHIP_L2_LINE_SIZE()) {
- /* Copy until 'dst' is cache-line-aligned. */
- for (; (uintptr_t)dst8 & (CHIP_L2_LINE_SIZE() - 1);
- n -= sizeof(op_t))
- ST8(dst8++, LD8(src8++));
-
- for (; n >= CHIP_L2_LINE_SIZE(); ) {
- op_t tmp0, tmp1, tmp2, tmp3;
- op_t tmp4, tmp5, tmp6, tmp7;
-
- /*
- * Prefetch and advance to next line
- * to prefetch, but don't go past the
- * end.
- */
- __insn_prefetch(prefetch);
-
- /* Make sure prefetch got scheduled
- earlier. */
- __asm__ ("" : : : "memory");
-
- prefetch += CHIP_L2_LINE_SIZE();
- prefetch = (prefetch < src1_end) ? prefetch :
- (const char *)src8;
-
- /*
- * Do all the loads before wh64. This
- * is necessary if [src8, src8+7] and
- * [dst8, dst8+7] share the same cache
- * line and dst8 <= src8, as can be
- * the case when called from memmove,
- * or with code tested on x86 whose
- * memcpy always works with forward
- * copies.
- */
- tmp0 = LD8(src8++);
- tmp1 = LD8(src8++);
- tmp2 = LD8(src8++);
- tmp3 = LD8(src8++);
- tmp4 = LD8(src8++);
- tmp5 = LD8(src8++);
- tmp6 = LD8(src8++);
- tmp7 = LD8(src8++);
-
- /* wh64 and wait for tmp7 load completion. */
- __asm__ ("move %0, %0; wh64 %1\n"
- : : "r"(tmp7), "r"(dst8));
-
- ST8(dst8++, tmp0);
- ST8(dst8++, tmp1);
- ST8(dst8++, tmp2);
- ST8(dst8++, tmp3);
- ST8(dst8++, tmp4);
- ST8(dst8++, tmp5);
- ST8(dst8++, tmp6);
- ST8(dst8++, tmp7);
-
- n -= CHIP_L2_LINE_SIZE();
- }
-#if CHIP_L2_LINE_SIZE() != 64
-# error "Fix code that assumes particular L2 cache line size."
-#endif
- }
-
- for (; n >= sizeof(op_t); n -= sizeof(op_t))
- ST8(dst8++, LD8(src8++));
-
- if (__builtin_expect(n == 0, 1))
- return RETVAL;
-
- final = LD8(src8);
- }
-
- /* n != 0 if we get here. Write out any trailing bytes. */
- dst1 = (char *)dst8;
-#ifndef __BIG_ENDIAN__
- if (n & 4) {
- ST4((uint32_t *)dst1, final);
- dst1 += 4;
- final >>= 32;
- n &= 3;
- }
- if (n & 2) {
- ST2((uint16_t *)dst1, final);
- dst1 += 2;
- final >>= 16;
- n &= 1;
- }
- if (n)
- ST1((uint8_t *)dst1, final);
-#else
- if (n & 4) {
- ST4((uint32_t *)dst1, final >> 32);
- dst1 += 4;
- }
- else
- {
- final >>= 32;
- }
- if (n & 2) {
- ST2((uint16_t *)dst1, final >> 16);
- dst1 += 2;
- }
- else
- {
- final >>= 16;
- }
- if (n & 1)
- ST1((uint8_t *)dst1, final >> 8);
-#endif
-
- return RETVAL;
-}
-
-#ifdef USERCOPY_FUNC
-#undef ST1
-#undef ST2
-#undef ST4
-#undef ST8
-#undef LD1
-#undef LD2
-#undef LD4
-#undef LD8
-#undef USERCOPY_FUNC
-#endif
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