projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */ |
| 2 | ||
| 8d379dad JB |
3 | #include <linux/config.h> |
| 4 | #include <linux/linkage.h> | |
| 5 | #include <asm/dwarf2.h> | |
| 6 | ||
| 7 | ALIGN | |
| 8 | copy_page_c: | |
| 9 | CFI_STARTPROC | |
| 10 | movl $4096/8,%ecx | |
| 11 | rep movsq | |
| 12 | ret | |
| 13 | CFI_ENDPROC | |
| 14 | ENDPROC(copy_page_c) | |
| 15 | ||
| 1da177e4 LT |
16 | /* Don't use streaming store because it's better when the target |
| 17 | ends up in cache. */ | |
| 18 | ||
| 19 | /* Could vary the prefetch distance based on SMP/UP */ | |
| 20 | ||
| 8d379dad JB |
21 | ENTRY(copy_page) |
| 22 | CFI_STARTPROC | |
| 7bcd3f34 | 23 | subq $3*8,%rsp |
| 8d379dad | 24 | CFI_ADJUST_CFA_OFFSET 3*8 |
| 7bcd3f34 | 25 | movq %rbx,(%rsp) |
| 8d379dad | 26 | CFI_REL_OFFSET rbx, 0 |
| 7bcd3f34 | 27 | movq %r12,1*8(%rsp) |
| 8d379dad | 28 | CFI_REL_OFFSET r12, 1*8 |
| 7bcd3f34 | 29 | movq %r13,2*8(%rsp) |
| 8d379dad | 30 | CFI_REL_OFFSET r13, 2*8 |
| 7bcd3f34 AK |
31 | |
| 32 | movl $(4096/64)-5,%ecx | |
| 33 | .p2align 4 | |
| 34 | .Loop64: | |
| 35 | dec %rcx | |
| 36 | ||
| 37 | movq (%rsi), %rax | |
| 38 | movq 8 (%rsi), %rbx | |
| 39 | movq 16 (%rsi), %rdx | |
| 40 | movq 24 (%rsi), %r8 | |
| 41 | movq 32 (%rsi), %r9 | |
| 42 | movq 40 (%rsi), %r10 | |
| 43 | movq 48 (%rsi), %r11 | |
| 44 | movq 56 (%rsi), %r12 | |
| 45 | ||
| 46 | prefetcht0 5*64(%rsi) | |
| 47 | ||
| 48 | movq %rax, (%rdi) | |
| 49 | movq %rbx, 8 (%rdi) | |
| 50 | movq %rdx, 16 (%rdi) | |
| 51 | movq %r8, 24 (%rdi) | |
| 52 | movq %r9, 32 (%rdi) | |
| 53 | movq %r10, 40 (%rdi) | |
| 54 | movq %r11, 48 (%rdi) | |
| 55 | movq %r12, 56 (%rdi) | |
| 56 | ||
| 57 | leaq 64 (%rsi), %rsi | |
| 58 | leaq 64 (%rdi), %rdi | |
| 59 | ||
| 60 | jnz .Loop64 | |
| 61 | ||
| 62 | movl $5,%ecx | |
| 63 | .p2align 4 | |
| 64 | .Loop2: | |
| 65 | decl %ecx | |
| 66 | ||
| 67 | movq (%rsi), %rax | |
| 68 | movq 8 (%rsi), %rbx | |
| 69 | movq 16 (%rsi), %rdx | |
| 70 | movq 24 (%rsi), %r8 | |
| 71 | movq 32 (%rsi), %r9 | |
| 72 | movq 40 (%rsi), %r10 | |
| 73 | movq 48 (%rsi), %r11 | |
| 74 | movq 56 (%rsi), %r12 | |
| 75 | ||
| 76 | movq %rax, (%rdi) | |
| 77 | movq %rbx, 8 (%rdi) | |
| 78 | movq %rdx, 16 (%rdi) | |
| 79 | movq %r8, 24 (%rdi) | |
| 80 | movq %r9, 32 (%rdi) | |
| 81 | movq %r10, 40 (%rdi) | |
| 82 | movq %r11, 48 (%rdi) | |
| 83 | movq %r12, 56 (%rdi) | |
| 84 | ||
| 85 | leaq 64(%rdi),%rdi | |
| 86 | leaq 64(%rsi),%rsi | |
| 87 | ||
| 88 | jnz .Loop2 | |
| 89 | ||
| 90 | movq (%rsp),%rbx | |
| 8d379dad | 91 | CFI_RESTORE rbx |
| 7bcd3f34 | 92 | movq 1*8(%rsp),%r12 |
| 8d379dad | 93 | CFI_RESTORE r12 |
| 7bcd3f34 | 94 | movq 2*8(%rsp),%r13 |
| 8d379dad | 95 | CFI_RESTORE r13 |
| 7bcd3f34 | 96 | addq $3*8,%rsp |
| 8d379dad | 97 | CFI_ADJUST_CFA_OFFSET -3*8 |
| 7bcd3f34 | 98 | ret |
| 8d379dad JB |
99 | .Lcopy_page_end: |
| 100 | CFI_ENDPROC | |
| 101 | ENDPROC(copy_page) | |
| 7bcd3f34 AK |
102 | |
| 103 | /* Some CPUs run faster using the string copy instructions. | |
| 104 | It is also a lot simpler. Use this when possible */ | |
| 105 | ||
| 106 | #include <asm/cpufeature.h> | |
| 107 | ||
| 8d379dad JB |
108 | .section .altinstr_replacement,"ax" |
| 109 | 1: .byte 0xeb /* jmp <disp8> */ | |
| 110 | .byte (copy_page_c - copy_page) - (2f - 1b) /* offset */ | |
| 111 | 2: | |
| 112 | .previous | |
| 7bcd3f34 AK |
113 | .section .altinstructions,"a" |
| 114 | .align 8 | |
| 8d379dad JB |
115 | .quad copy_page |
| 116 | .quad 1b | |
| 117 | .byte X86_FEATURE_REP_GOOD | |
| 118 | .byte .Lcopy_page_end - copy_page | |
| 119 | .byte 2b - 1b | |
| 7bcd3f34 | 120 | .previous |