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