---

yaml
---
r: 19768
b: refs/heads/master
c: 7bcd3f3
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6bca52b544489b626c7d0db801df6b4aa3d5adb5
+refs/heads/master: 7bcd3f34e262bbebffa954d80eab3a84f053da31

trunk/arch/x86_64/kernel/setup.c

@@ -877,6 +877,7 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
 static int __init init_amd(struct cpuinfo_x86 *c)
 {
 	int r;
+	unsigned level;
 
 #ifdef CONFIG_SMP
 	unsigned long value;
@@ -899,6 +900,11 @@ static int __init init_amd(struct cpuinfo_x86 *c)
 	   3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
 	clear_bit(0*32+31, &c->x86_capability);
 
+	/* On C+ stepping K8 rep microcode works well for copy/memset */
+	level = cpuid_eax(1);
+	if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58))
+		set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
+
 	r = get_model_name(c);
 	if (!r) { 
 		switch (c->x86) { 

trunk/arch/x86_64/lib/clear_page.S

@@ -5,8 +5,46 @@
 	.globl clear_page
 	.p2align 4
 clear_page:
+	xorl   %eax,%eax
+	movl   $4096/64,%ecx
+	.p2align 4
+.Lloop:
+	decl	%ecx
+#define PUT(x) movq %rax,x*8(%rdi)
+	movq %rax,(%rdi)
+	PUT(1)
+	PUT(2)
+	PUT(3)
+	PUT(4)
+	PUT(5)
+	PUT(6)
+	PUT(7)
+	leaq	64(%rdi),%rdi
+	jnz	.Lloop
+	nop
+	ret
+clear_page_end:
+
+	/* Some CPUs run faster using the string instructions.
+	   It is also a lot simpler. Use this when possible */
+
+#include <asm/cpufeature.h>
+
+	.section .altinstructions,"a"
+	.align 8
+	.quad  clear_page
+	.quad  clear_page_c
+	.byte  X86_FEATURE_REP_GOOD
+	.byte  clear_page_end-clear_page
+	.byte  clear_page_c_end-clear_page_c
+	.previous
+
+	.section .altinstr_replacement,"ax"
+clear_page_c:
 	movl $4096/8,%ecx
 	xorl %eax,%eax
 	rep 
 	stosq
 	ret
+clear_page_c_end:
+	.previous

trunk/arch/x86_64/lib/copy_page.S

@@ -8,7 +8,94 @@
 	.globl copy_page
 	.p2align 4
 copy_page:
+	subq	$3*8,%rsp
+	movq	%rbx,(%rsp)
+	movq	%r12,1*8(%rsp)
+	movq	%r13,2*8(%rsp)
+
+	movl	$(4096/64)-5,%ecx
+	.p2align 4
+.Loop64:
+  	dec     %rcx
+
+	movq        (%rsi), %rax
+	movq      8 (%rsi), %rbx
+	movq     16 (%rsi), %rdx
+	movq     24 (%rsi), %r8
+	movq     32 (%rsi), %r9
+	movq     40 (%rsi), %r10
+	movq     48 (%rsi), %r11
+	movq     56 (%rsi), %r12
+
+	prefetcht0 5*64(%rsi)
+
+	movq     %rax,    (%rdi)
+	movq     %rbx,  8 (%rdi)
+	movq     %rdx, 16 (%rdi)
+	movq     %r8,  24 (%rdi)
+	movq     %r9,  32 (%rdi)
+	movq     %r10, 40 (%rdi)
+	movq     %r11, 48 (%rdi)
+	movq     %r12, 56 (%rdi)
+
+	leaq    64 (%rsi), %rsi
+	leaq    64 (%rdi), %rdi
+
+	jnz     .Loop64
+
+	movl	$5,%ecx
+	.p2align 4
+.Loop2:
+	decl   %ecx
+
+	movq        (%rsi), %rax
+	movq      8 (%rsi), %rbx
+	movq     16 (%rsi), %rdx
+	movq     24 (%rsi), %r8
+	movq     32 (%rsi), %r9
+	movq     40 (%rsi), %r10
+	movq     48 (%rsi), %r11
+	movq     56 (%rsi), %r12
+
+	movq     %rax,    (%rdi)
+	movq     %rbx,  8 (%rdi)
+	movq     %rdx, 16 (%rdi)
+	movq     %r8,  24 (%rdi)
+	movq     %r9,  32 (%rdi)
+	movq     %r10, 40 (%rdi)
+	movq     %r11, 48 (%rdi)
+	movq     %r12, 56 (%rdi)
+
+	leaq	64(%rdi),%rdi
+	leaq	64(%rsi),%rsi
+
+	jnz	.Loop2
+
+	movq	(%rsp),%rbx
+	movq	1*8(%rsp),%r12
+	movq	2*8(%rsp),%r13
+	addq	$3*8,%rsp
+	ret
+
+	/* Some CPUs run faster using the string copy instructions.
+	   It is also a lot simpler. Use this when possible */
+
+#include <asm/cpufeature.h>
+
+	.section .altinstructions,"a"
+	.align 8
+	.quad  copy_page
+	.quad  copy_page_c
+	.byte  X86_FEATURE_REP_GOOD
+	.byte  copy_page_c_end-copy_page_c
+	.byte  copy_page_c_end-copy_page_c
+	.previous
+
+	.section .altinstr_replacement,"ax"
+copy_page_c:
 	movl $4096/8,%ecx
 	rep 
 	movsq 
 	ret
+copy_page_c_end:
+	.previous