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gerrit-public.fairphone.software / kernel / msm-4.9 / 7355ba3445f2a741bfb9f03c7c8d5fc3e10bf63f / . / arch / x86 / lib / copy_page_64.S
blob: 6b34d04d096aaa40f4b1c1e3fea61ceaa9911075 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */
Dave Jones038b0a62006-10-04 03:38:54 -0400[diff] [blame]2
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]3#include <linux/linkage.h>
4#include <asm/dwarf2.h>
Andy Lutomirski59e97e42011-07-13 09:24:10 -0400[diff] [blame]5#include <asm/alternative-asm.h>
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]6
7 ALIGN
8copy_page_c:
9 CFI_STARTPROC
10 movl $4096/8,%ecx
11 rep movsq
12 ret
13 CFI_ENDPROC
14ENDPROC(copy_page_c)
15
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]21ENTRY(copy_page)
22 CFI_STARTPROC
Jan Beulich42693292012-01-05 16:12:25 +0000[diff] [blame]23 subq $2*8,%rsp
24 CFI_ADJUST_CFA_OFFSET 2*8
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]25 movq %rbx,(%rsp)
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]26 CFI_REL_OFFSET rbx, 0
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]27 movq %r12,1*8(%rsp)
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]28 CFI_REL_OFFSET r12, 1*8
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]29
30 movl $(4096/64)-5,%ecx
31 .p2align 4
32.Loop64:
33 dec %rcx
34
35 movq (%rsi), %rax
36 movq 8 (%rsi), %rbx
37 movq 16 (%rsi), %rdx
38 movq 24 (%rsi), %r8
39 movq 32 (%rsi), %r9
40 movq 40 (%rsi), %r10
41 movq 48 (%rsi), %r11
42 movq 56 (%rsi), %r12
43
44 prefetcht0 5*64(%rsi)
45
46 movq %rax, (%rdi)
47 movq %rbx, 8 (%rdi)
48 movq %rdx, 16 (%rdi)
49 movq %r8, 24 (%rdi)
50 movq %r9, 32 (%rdi)
51 movq %r10, 40 (%rdi)
52 movq %r11, 48 (%rdi)
53 movq %r12, 56 (%rdi)
54
55 leaq 64 (%rsi), %rsi
56 leaq 64 (%rdi), %rdi
57
58 jnz .Loop64
59
60 movl $5,%ecx
61 .p2align 4
62.Loop2:
63 decl %ecx
64
65 movq (%rsi), %rax
66 movq 8 (%rsi), %rbx
67 movq 16 (%rsi), %rdx
68 movq 24 (%rsi), %r8
69 movq 32 (%rsi), %r9
70 movq 40 (%rsi), %r10
71 movq 48 (%rsi), %r11
72 movq 56 (%rsi), %r12
73
74 movq %rax, (%rdi)
75 movq %rbx, 8 (%rdi)
76 movq %rdx, 16 (%rdi)
77 movq %r8, 24 (%rdi)
78 movq %r9, 32 (%rdi)
79 movq %r10, 40 (%rdi)
80 movq %r11, 48 (%rdi)
81 movq %r12, 56 (%rdi)
82
83 leaq 64(%rdi),%rdi
84 leaq 64(%rsi),%rsi
85
86 jnz .Loop2
87
88 movq (%rsp),%rbx
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]89 CFI_RESTORE rbx
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]90 movq 1*8(%rsp),%r12
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]91 CFI_RESTORE r12
Jan Beulich42693292012-01-05 16:12:25 +0000[diff] [blame]92 addq $2*8,%rsp
93 CFI_ADJUST_CFA_OFFSET -2*8
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]94 ret
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]95.Lcopy_page_end:
96 CFI_ENDPROC
97ENDPROC(copy_page)
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]98
99 /* Some CPUs run faster using the string copy instructions.
100 It is also a lot simpler. Use this when possible */
101
102#include <asm/cpufeature.h>
103
Jan Beulich8d379da2006-09-26 10:52:32 +0200[diff] [blame]104 .section .altinstr_replacement,"ax"
1051: .byte 0xeb /* jmp <disp8> */
106 .byte (copy_page_c - copy_page) - (2f - 1b) /* offset */
1072:
108 .previous
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]109 .section .altinstructions,"a"
Andy Lutomirski59e97e42011-07-13 09:24:10 -0400[diff] [blame]110 altinstruction_entry copy_page, 1b, X86_FEATURE_REP_GOOD, \
111 .Lcopy_page_end-copy_page, 2b-1b
Andi Kleen7bcd3f32006-02-03 21:51:02 +0100[diff] [blame]112 .previous