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89 lines
1.8 KiB
89 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */ |
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#include <linux/linkage.h> |
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#include <asm/cpufeatures.h> |
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#include <asm/alternative-asm.h> |
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#include <asm/export.h> |
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/* |
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* Some CPUs run faster using the string copy instructions (sane microcode). |
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* It is also a lot simpler. Use this when possible. But, don't use streaming |
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* copy unless the CPU indicates X86_FEATURE_REP_GOOD. Could vary the |
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* prefetch distance based on SMP/UP. |
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*/ |
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ALIGN |
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SYM_FUNC_START(copy_page) |
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ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD |
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movl $4096/8, %ecx |
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rep movsq |
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ret |
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SYM_FUNC_END(copy_page) |
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EXPORT_SYMBOL(copy_page) |
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SYM_FUNC_START_LOCAL(copy_page_regs) |
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subq $2*8, %rsp |
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movq %rbx, (%rsp) |
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movq %r12, 1*8(%rsp) |
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movl $(4096/64)-5, %ecx |
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.p2align 4 |
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.Loop64: |
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dec %rcx |
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movq 0x8*0(%rsi), %rax |
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movq 0x8*1(%rsi), %rbx |
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movq 0x8*2(%rsi), %rdx |
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movq 0x8*3(%rsi), %r8 |
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movq 0x8*4(%rsi), %r9 |
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movq 0x8*5(%rsi), %r10 |
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movq 0x8*6(%rsi), %r11 |
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movq 0x8*7(%rsi), %r12 |
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prefetcht0 5*64(%rsi) |
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movq %rax, 0x8*0(%rdi) |
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movq %rbx, 0x8*1(%rdi) |
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movq %rdx, 0x8*2(%rdi) |
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movq %r8, 0x8*3(%rdi) |
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movq %r9, 0x8*4(%rdi) |
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movq %r10, 0x8*5(%rdi) |
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movq %r11, 0x8*6(%rdi) |
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movq %r12, 0x8*7(%rdi) |
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leaq 64 (%rsi), %rsi |
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leaq 64 (%rdi), %rdi |
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jnz .Loop64 |
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movl $5, %ecx |
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.p2align 4 |
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.Loop2: |
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decl %ecx |
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movq 0x8*0(%rsi), %rax |
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movq 0x8*1(%rsi), %rbx |
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movq 0x8*2(%rsi), %rdx |
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movq 0x8*3(%rsi), %r8 |
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movq 0x8*4(%rsi), %r9 |
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movq 0x8*5(%rsi), %r10 |
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movq 0x8*6(%rsi), %r11 |
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movq 0x8*7(%rsi), %r12 |
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movq %rax, 0x8*0(%rdi) |
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movq %rbx, 0x8*1(%rdi) |
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movq %rdx, 0x8*2(%rdi) |
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movq %r8, 0x8*3(%rdi) |
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movq %r9, 0x8*4(%rdi) |
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movq %r10, 0x8*5(%rdi) |
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movq %r11, 0x8*6(%rdi) |
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movq %r12, 0x8*7(%rdi) |
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leaq 64(%rdi), %rdi |
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leaq 64(%rsi), %rsi |
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jnz .Loop2 |
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movq (%rsp), %rbx |
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movq 1*8(%rsp), %r12 |
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addq $2*8, %rsp |
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ret |
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SYM_FUNC_END(copy_page_regs)
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