projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 8d379dad | 1 | #include <linux/linkage.h> |
| cd4d09ec | 2 | #include <asm/cpufeatures.h> |
| e365c9df | 3 | #include <asm/alternative-asm.h> |
| 784d5699 | 4 | #include <asm/export.h> |
| 8d379dad | 5 | |
| 1da177e4 | 6 | /* |
| 6620ef28 BP |
7 | * Most CPUs support enhanced REP MOVSB/STOSB instructions. It is |
| 8 | * recommended to use this when possible and we do use them by default. | |
| 9 | * If enhanced REP MOVSB/STOSB is not available, try to use fast string. | |
| 10 | * Otherwise, use original. | |
| 11 | */ | |
| 12 | ||
| 13 | /* | |
| 14 | * Zero a page. | |
| 15 | * %rdi - page | |
| 16 | */ | |
| f25d3847 | 17 | ENTRY(clear_page_rep) |
| 8d379dad JB |
18 | movl $4096/8,%ecx |
| 19 | xorl %eax,%eax | |
| 20 | rep stosq | |
| 21 | ret | |
| f25d3847 BP |
22 | ENDPROC(clear_page_rep) |
| 23 | EXPORT_SYMBOL_GPL(clear_page_rep) | |
| 8d379dad | 24 | |
| 6620ef28 | 25 | ENTRY(clear_page_orig) |
| 7bcd3f34 AK |
26 | xorl %eax,%eax |
| 27 | movl $4096/64,%ecx | |
| 28 | .p2align 4 | |
| 29 | .Lloop: | |
| 30 | decl %ecx | |
| 31 | #define PUT(x) movq %rax,x*8(%rdi) | |
| 32 | movq %rax,(%rdi) | |
| 33 | PUT(1) | |
| 34 | PUT(2) | |
| 35 | PUT(3) | |
| 36 | PUT(4) | |
| 37 | PUT(5) | |
| 38 | PUT(6) | |
| 39 | PUT(7) | |
| 40 | leaq 64(%rdi),%rdi | |
| 41 | jnz .Lloop | |
| 42 | nop | |
| 43 | ret | |
| 6620ef28 | 44 | ENDPROC(clear_page_orig) |
| f25d3847 | 45 | EXPORT_SYMBOL_GPL(clear_page_orig) |
| 7bcd3f34 | 46 | |
| f25d3847 | 47 | ENTRY(clear_page_erms) |
| 6620ef28 BP |
48 | movl $4096,%ecx |
| 49 | xorl %eax,%eax | |
| 50 | rep stosb | |
| 51 | ret | |
| f25d3847 BP |
52 | ENDPROC(clear_page_erms) |
| 53 | EXPORT_SYMBOL_GPL(clear_page_erms) |