Blame - arch/x86/lib/copy_page_64.S - kernel/msm-4.9

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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 */
Dave Jones	038b0a6	2006-10-04 03:38:54 -0400	[diff] [blame]	2
Jan Beulich	8d379da	2006-09-26 10:52:32 +0200	[diff] [blame]	3	#include <linux/linkage.h>
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	4	#include <asm/cpufeature.h>
Andy Lutomirski	59e97e4	2011-07-13 09:24:10 -0400	[diff] [blame]	5	#include <asm/alternative-asm.h>
Jan Beulich	8d379da	2006-09-26 10:52:32 +0200	[diff] [blame]	6
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	7	/*
				8	* Some CPUs run faster using the string copy instructions (sane microcode).
				9	* It is also a lot simpler. Use this when possible. But, don't use streaming
				10	* copy unless the CPU indicates X86_FEATURE_REP_GOOD. Could vary the
				11	* prefetch distance based on SMP/UP.
				12	*/
Jan Beulich	8d379da	2006-09-26 10:52:32 +0200	[diff] [blame]	13	ALIGN
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	14	ENTRY(copy_page)
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	15	ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	16	movl $4096/8, %ecx
				17	rep movsq
Jan Beulich	8d379da	2006-09-26 10:52:32 +0200	[diff] [blame]	18	ret
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	19	ENDPROC(copy_page)
Jan Beulich	8d379da	2006-09-26 10:52:32 +0200	[diff] [blame]	20
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	21	ENTRY(copy_page_regs)
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	22	subq $2*8, %rsp
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	23	movq %rbx, (%rsp)
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	24	movq %r12, 1*8(%rsp)
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	25
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	26	movl $(4096/64)-5, %ecx
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	27	.p2align 4
				28	.Loop64:
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	29	dec %rcx
				30	movq 0x8*0(%rsi), %rax
				31	movq 0x8*1(%rsi), %rbx
				32	movq 0x8*2(%rsi), %rdx
				33	movq 0x8*3(%rsi), %r8
				34	movq 0x8*4(%rsi), %r9
				35	movq 0x8*5(%rsi), %r10
				36	movq 0x8*6(%rsi), %r11
				37	movq 0x8*7(%rsi), %r12
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	38
				39	prefetcht0 5*64(%rsi)
				40
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	41	movq %rax, 0x8*0(%rdi)
				42	movq %rbx, 0x8*1(%rdi)
				43	movq %rdx, 0x8*2(%rdi)
				44	movq %r8, 0x8*3(%rdi)
				45	movq %r9, 0x8*4(%rdi)
				46	movq %r10, 0x8*5(%rdi)
				47	movq %r11, 0x8*6(%rdi)
				48	movq %r12, 0x8*7(%rdi)
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	49
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	50	leaq 64 (%rsi), %rsi
				51	leaq 64 (%rdi), %rdi
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	52
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	53	jnz .Loop64
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	54
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	55	movl $5, %ecx
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	56	.p2align 4
				57	.Loop2:
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	58	decl %ecx
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	59
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	60	movq 0x8*0(%rsi), %rax
				61	movq 0x8*1(%rsi), %rbx
				62	movq 0x8*2(%rsi), %rdx
				63	movq 0x8*3(%rsi), %r8
				64	movq 0x8*4(%rsi), %r9
				65	movq 0x8*5(%rsi), %r10
				66	movq 0x8*6(%rsi), %r11
				67	movq 0x8*7(%rsi), %r12
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	68
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	69	movq %rax, 0x8*0(%rdi)
				70	movq %rbx, 0x8*1(%rdi)
				71	movq %rdx, 0x8*2(%rdi)
				72	movq %r8, 0x8*3(%rdi)
				73	movq %r9, 0x8*4(%rdi)
				74	movq %r10, 0x8*5(%rdi)
				75	movq %r11, 0x8*6(%rdi)
				76	movq %r12, 0x8*7(%rdi)
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	77
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	78	leaq 64(%rdi), %rdi
				79	leaq 64(%rsi), %rsi
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	80	jnz .Loop2
				81
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	82	movq (%rsp), %rbx
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	83	movq 1*8(%rsp), %r12
Ma Ling	269833b	2012-10-18 03:52:45 +0800	[diff] [blame]	84	addq $2*8, %rsp
Andi Kleen	7bcd3f3	2006-02-03 21:51:02 +0100	[diff] [blame]	85	ret
Borislav Petkov	090a3f6	2015-01-12 18:19:40 +0100	[diff] [blame]	86	ENDPROC(copy_page_regs)