| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */ |
| 2 | |
| 3 | /* Don't use streaming store because it's better when the target |
| 4 | ends up in cache. */ |
| 5 | |
| 6 | /* Could vary the prefetch distance based on SMP/UP */ |
| 7 | |
| 8 | .globl copy_page |
| 9 | .p2align 4 |
| 10 | copy_page: |
| 11 | subq $3*8,%rsp |
| 12 | movq %rbx,(%rsp) |
| 13 | movq %r12,1*8(%rsp) |
| 14 | movq %r13,2*8(%rsp) |
| 15 | |
| 16 | movl $(4096/64)-5,%ecx |
| 17 | .p2align 4 |
| 18 | .Loop64: |
| 19 | dec %rcx |
| 20 | |
| 21 | movq (%rsi), %rax |
| 22 | movq 8 (%rsi), %rbx |
| 23 | movq 16 (%rsi), %rdx |
| 24 | movq 24 (%rsi), %r8 |
| 25 | movq 32 (%rsi), %r9 |
| 26 | movq 40 (%rsi), %r10 |
| 27 | movq 48 (%rsi), %r11 |
| 28 | movq 56 (%rsi), %r12 |
| 29 | |
| 30 | prefetcht0 5*64(%rsi) |
| 31 | |
| 32 | movq %rax, (%rdi) |
| 33 | movq %rbx, 8 (%rdi) |
| 34 | movq %rdx, 16 (%rdi) |
| 35 | movq %r8, 24 (%rdi) |
| 36 | movq %r9, 32 (%rdi) |
| 37 | movq %r10, 40 (%rdi) |
| 38 | movq %r11, 48 (%rdi) |
| 39 | movq %r12, 56 (%rdi) |
| 40 | |
| 41 | leaq 64 (%rsi), %rsi |
| 42 | leaq 64 (%rdi), %rdi |
| 43 | |
| 44 | jnz .Loop64 |
| 45 | |
| 46 | movl $5,%ecx |
| 47 | .p2align 4 |
| 48 | .Loop2: |
| 49 | decl %ecx |
| 50 | |
| 51 | movq (%rsi), %rax |
| 52 | movq 8 (%rsi), %rbx |
| 53 | movq 16 (%rsi), %rdx |
| 54 | movq 24 (%rsi), %r8 |
| 55 | movq 32 (%rsi), %r9 |
| 56 | movq 40 (%rsi), %r10 |
| 57 | movq 48 (%rsi), %r11 |
| 58 | movq 56 (%rsi), %r12 |
| 59 | |
| 60 | movq %rax, (%rdi) |
| 61 | movq %rbx, 8 (%rdi) |
| 62 | movq %rdx, 16 (%rdi) |
| 63 | movq %r8, 24 (%rdi) |
| 64 | movq %r9, 32 (%rdi) |
| 65 | movq %r10, 40 (%rdi) |
| 66 | movq %r11, 48 (%rdi) |
| 67 | movq %r12, 56 (%rdi) |
| 68 | |
| 69 | leaq 64(%rdi),%rdi |
| 70 | leaq 64(%rsi),%rsi |
| 71 | |
| 72 | jnz .Loop2 |
| 73 | |
| 74 | movq (%rsp),%rbx |
| 75 | movq 1*8(%rsp),%r12 |
| 76 | movq 2*8(%rsp),%r13 |
| 77 | addq $3*8,%rsp |
| 78 | ret |
| 79 | |
| 80 | /* C stepping K8 run faster using the string copy instructions. |
| 81 | It is also a lot simpler. Use this when possible */ |
| 82 | |
| 83 | #include <asm/cpufeature.h> |
| 84 | |
| 85 | .section .altinstructions,"a" |
| 86 | .align 8 |
| 87 | .quad copy_page |
| 88 | .quad copy_page_c |
| 89 | .byte X86_FEATURE_K8_C |
| 90 | .byte copy_page_c_end-copy_page_c |
| 91 | .byte copy_page_c_end-copy_page_c |
| 92 | .previous |
| 93 | |
| 94 | .section .altinstr_replacement,"ax" |
| 95 | copy_page_c: |
| 96 | movl $4096/8,%ecx |
| 97 | rep |
| 98 | movsq |
| 99 | ret |
| 100 | copy_page_c_end: |
| 101 | .previous |