projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */ |
| 038b0a6d | 2 | |
| 8d379dad JB |
3 | #include <linux/linkage.h> |
| 4 | #include <asm/dwarf2.h> | |
| 59e97e4d | 5 | #include <asm/alternative-asm.h> |
| 8d379dad JB |
6 | |
| 7 | ALIGN | |
| 269833bd | 8 | copy_page_rep: |
| 8d379dad | 9 | CFI_STARTPROC |
| 269833bd ML |
10 | movl $4096/8, %ecx |
| 11 | rep movsq | |
| 8d379dad JB |
12 | ret |
| 13 | CFI_ENDPROC | |
| 269833bd | 14 | ENDPROC(copy_page_rep) |
| 8d379dad | 15 | |
| 269833bd ML |
16 | /* |
| 17 | * Don't use streaming copy unless the CPU indicates X86_FEATURE_REP_GOOD. | |
| 18 | * Could vary the prefetch distance based on SMP/UP. | |
| 19 | */ | |
| 1da177e4 | 20 | |
| 8d379dad JB |
21 | ENTRY(copy_page) |
| 22 | CFI_STARTPROC | |
| 269833bd | 23 | subq $2*8, %rsp |
| 42693290 | 24 | CFI_ADJUST_CFA_OFFSET 2*8 |
| 269833bd | 25 | movq %rbx, (%rsp) |
| 8d379dad | 26 | CFI_REL_OFFSET rbx, 0 |
| 269833bd | 27 | movq %r12, 1*8(%rsp) |
| 8d379dad | 28 | CFI_REL_OFFSET r12, 1*8 |
| 7bcd3f34 | 29 | |
| 269833bd | 30 | movl $(4096/64)-5, %ecx |
| 7bcd3f34 AK |
31 | .p2align 4 |
| 32 | .Loop64: | |
| 269833bd ML |
33 | dec %rcx |
| 34 | movq 0x8*0(%rsi), %rax | |
| 35 | movq 0x8*1(%rsi), %rbx | |
| 36 | movq 0x8*2(%rsi), %rdx | |
| 37 | movq 0x8*3(%rsi), %r8 | |
| 38 | movq 0x8*4(%rsi), %r9 | |
| 39 | movq 0x8*5(%rsi), %r10 | |
| 40 | movq 0x8*6(%rsi), %r11 | |
| 41 | movq 0x8*7(%rsi), %r12 | |
| 7bcd3f34 AK |
42 | |
| 43 | prefetcht0 5*64(%rsi) | |
| 44 | ||
| 269833bd ML |
45 | movq %rax, 0x8*0(%rdi) |
| 46 | movq %rbx, 0x8*1(%rdi) | |
| 47 | movq %rdx, 0x8*2(%rdi) | |
| 48 | movq %r8, 0x8*3(%rdi) | |
| 49 | movq %r9, 0x8*4(%rdi) | |
| 50 | movq %r10, 0x8*5(%rdi) | |
| 51 | movq %r11, 0x8*6(%rdi) | |
| 52 | movq %r12, 0x8*7(%rdi) | |
| 7bcd3f34 | 53 | |
| 269833bd ML |
54 | leaq 64 (%rsi), %rsi |
| 55 | leaq 64 (%rdi), %rdi | |
| 7bcd3f34 | 56 | |
| 269833bd | 57 | jnz .Loop64 |
| 7bcd3f34 | 58 | |
| 269833bd | 59 | movl $5, %ecx |
| 7bcd3f34 AK |
60 | .p2align 4 |
| 61 | .Loop2: | |
| 269833bd ML |
62 | decl %ecx |
| 63 | ||
| 64 | movq 0x8*0(%rsi), %rax | |
| 65 | movq 0x8*1(%rsi), %rbx | |
| 66 | movq 0x8*2(%rsi), %rdx | |
| 67 | movq 0x8*3(%rsi), %r8 | |
| 68 | movq 0x8*4(%rsi), %r9 | |
| 69 | movq 0x8*5(%rsi), %r10 | |
| 70 | movq 0x8*6(%rsi), %r11 | |
| 71 | movq 0x8*7(%rsi), %r12 | |
| 72 | ||
| 73 | movq %rax, 0x8*0(%rdi) | |
| 74 | movq %rbx, 0x8*1(%rdi) | |
| 75 | movq %rdx, 0x8*2(%rdi) | |
| 76 | movq %r8, 0x8*3(%rdi) | |
| 77 | movq %r9, 0x8*4(%rdi) | |
| 78 | movq %r10, 0x8*5(%rdi) | |
| 79 | movq %r11, 0x8*6(%rdi) | |
| 80 | movq %r12, 0x8*7(%rdi) | |
| 81 | ||
| 82 | leaq 64(%rdi), %rdi | |
| 83 | leaq 64(%rsi), %rsi | |
| 7bcd3f34 AK |
84 | jnz .Loop2 |
| 85 | ||
| 269833bd | 86 | movq (%rsp), %rbx |
| 8d379dad | 87 | CFI_RESTORE rbx |
| 269833bd | 88 | movq 1*8(%rsp), %r12 |
| 8d379dad | 89 | CFI_RESTORE r12 |
| 269833bd | 90 | addq $2*8, %rsp |
| 42693290 | 91 | CFI_ADJUST_CFA_OFFSET -2*8 |
| 7bcd3f34 | 92 | ret |
| 8d379dad JB |
93 | .Lcopy_page_end: |
| 94 | CFI_ENDPROC | |
| 95 | ENDPROC(copy_page) | |
| 7bcd3f34 AK |
96 | |
| 97 | /* Some CPUs run faster using the string copy instructions. | |
| 98 | It is also a lot simpler. Use this when possible */ | |
| 99 | ||
| 100 | #include <asm/cpufeature.h> | |
| 101 | ||
| 8d379dad JB |
102 | .section .altinstr_replacement,"ax" |
| 103 | 1: .byte 0xeb /* jmp <disp8> */ | |
| 269833bd | 104 | .byte (copy_page_rep - copy_page) - (2f - 1b) /* offset */ |
| 8d379dad JB |
105 | 2: |
| 106 | .previous | |
| 7bcd3f34 | 107 | .section .altinstructions,"a" |
| 59e97e4d AL |
108 | altinstruction_entry copy_page, 1b, X86_FEATURE_REP_GOOD, \ |
| 109 | .Lcopy_page_end-copy_page, 2b-1b | |
| 7bcd3f34 | 110 | .previous |