X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;ds=sidebyside;f=kernel%2Farch%2Fx86%2Flib%2Fcsum-copy_64.S;fp=kernel%2Farch%2Fx86%2Flib%2Fcsum-copy_64.S;h=9734182966f3be925a38c0762aa71e3148156148;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/arch/x86/lib/csum-copy_64.S b/kernel/arch/x86/lib/csum-copy_64.S
new file mode 100644
index 000000000..973418296
--- /dev/null
+++ b/kernel/arch/x86/lib/csum-copy_64.S
@@ -0,0 +1,241 @@
+/*
+ * Copyright 2002, 2003 Andi Kleen, SuSE Labs.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details. No warranty for anything given at all.
+ */
+#include <linux/linkage.h>
+#include <asm/dwarf2.h>
+#include <asm/errno.h>
+#include <asm/asm.h>
+
+/*
+ * Checksum copy with exception handling.
+ * On exceptions src_err_ptr or dst_err_ptr is set to -EFAULT and the
+ * destination is zeroed.
+ *
+ * Input
+ * rdi  source
+ * rsi  destination
+ * edx  len (32bit)
+ * ecx  sum (32bit)
+ * r8   src_err_ptr (int)
+ * r9   dst_err_ptr (int)
+ *
+ * Output
+ * eax  64bit sum. undefined in case of exception.
+ *
+ * Wrappers need to take care of valid exception sum and zeroing.
+ * They also should align source or destination to 8 bytes.
+ */
+
+	.macro source
+10:
+	_ASM_EXTABLE(10b, .Lbad_source)
+	.endm
+
+	.macro dest
+20:
+	_ASM_EXTABLE(20b, .Lbad_dest)
+	.endm
+
+	.macro ignore L=.Lignore
+30:
+	_ASM_EXTABLE(30b, \L)
+	.endm
+
+
+ENTRY(csum_partial_copy_generic)
+	CFI_STARTPROC
+	cmpl	$3*64, %edx
+	jle	.Lignore
+
+.Lignore:
+	subq  $7*8, %rsp
+	CFI_ADJUST_CFA_OFFSET 7*8
+	movq  %rbx, 2*8(%rsp)
+	CFI_REL_OFFSET rbx, 2*8
+	movq  %r12, 3*8(%rsp)
+	CFI_REL_OFFSET r12, 3*8
+	movq  %r14, 4*8(%rsp)
+	CFI_REL_OFFSET r14, 4*8
+	movq  %r13, 5*8(%rsp)
+	CFI_REL_OFFSET r13, 5*8
+	movq  %rbp, 6*8(%rsp)
+	CFI_REL_OFFSET rbp, 6*8
+
+	movq  %r8, (%rsp)
+	movq  %r9, 1*8(%rsp)
+
+	movl  %ecx, %eax
+	movl  %edx, %ecx
+
+	xorl  %r9d, %r9d
+	movq  %rcx, %r12
+
+	shrq  $6, %r12
+	jz	.Lhandle_tail       /* < 64 */
+
+	clc
+
+	/* main loop. clear in 64 byte blocks */
+	/* r9: zero, r8: temp2, rbx: temp1, rax: sum, rcx: saved length */
+	/* r11:	temp3, rdx: temp4, r12 loopcnt */
+	/* r10:	temp5, rbp: temp6, r14 temp7, r13 temp8 */
+	.p2align 4
+.Lloop:
+	source
+	movq  (%rdi), %rbx
+	source
+	movq  8(%rdi), %r8
+	source
+	movq  16(%rdi), %r11
+	source
+	movq  24(%rdi), %rdx
+
+	source
+	movq  32(%rdi), %r10
+	source
+	movq  40(%rdi), %rbp
+	source
+	movq  48(%rdi), %r14
+	source
+	movq  56(%rdi), %r13
+
+	ignore 2f
+	prefetcht0 5*64(%rdi)
+2:
+	adcq  %rbx, %rax
+	adcq  %r8, %rax
+	adcq  %r11, %rax
+	adcq  %rdx, %rax
+	adcq  %r10, %rax
+	adcq  %rbp, %rax
+	adcq  %r14, %rax
+	adcq  %r13, %rax
+
+	decl %r12d
+
+	dest
+	movq %rbx, (%rsi)
+	dest
+	movq %r8, 8(%rsi)
+	dest
+	movq %r11, 16(%rsi)
+	dest
+	movq %rdx, 24(%rsi)
+
+	dest
+	movq %r10, 32(%rsi)
+	dest
+	movq %rbp, 40(%rsi)
+	dest
+	movq %r14, 48(%rsi)
+	dest
+	movq %r13, 56(%rsi)
+
+3:
+
+	leaq 64(%rdi), %rdi
+	leaq 64(%rsi), %rsi
+
+	jnz	.Lloop
+
+	adcq  %r9, %rax
+
+	/* do last up to 56 bytes */
+.Lhandle_tail:
+	/* ecx:	count */
+	movl %ecx, %r10d
+	andl $63, %ecx
+	shrl $3, %ecx
+	jz	.Lfold
+	clc
+	.p2align 4
+.Lloop_8:
+	source
+	movq (%rdi), %rbx
+	adcq %rbx, %rax
+	decl %ecx
+	dest
+	movq %rbx, (%rsi)
+	leaq 8(%rsi), %rsi /* preserve carry */
+	leaq 8(%rdi), %rdi
+	jnz	.Lloop_8
+	adcq %r9, %rax	/* add in carry */
+
+.Lfold:
+	/* reduce checksum to 32bits */
+	movl %eax, %ebx
+	shrq $32, %rax
+	addl %ebx, %eax
+	adcl %r9d, %eax
+
+	/* do last up to 6 bytes */
+.Lhandle_7:
+	movl %r10d, %ecx
+	andl $7, %ecx
+	shrl $1, %ecx
+	jz   .Lhandle_1
+	movl $2, %edx
+	xorl %ebx, %ebx
+	clc
+	.p2align 4
+.Lloop_1:
+	source
+	movw (%rdi), %bx
+	adcl %ebx, %eax
+	decl %ecx
+	dest
+	movw %bx, (%rsi)
+	leaq 2(%rdi), %rdi
+	leaq 2(%rsi), %rsi
+	jnz .Lloop_1
+	adcl %r9d, %eax	/* add in carry */
+
+	/* handle last odd byte */
+.Lhandle_1:
+	testb $1, %r10b
+	jz    .Lende
+	xorl  %ebx, %ebx
+	source
+	movb (%rdi), %bl
+	dest
+	movb %bl, (%rsi)
+	addl %ebx, %eax
+	adcl %r9d, %eax		/* carry */
+
+	CFI_REMEMBER_STATE
+.Lende:
+	movq 2*8(%rsp), %rbx
+	CFI_RESTORE rbx
+	movq 3*8(%rsp), %r12
+	CFI_RESTORE r12
+	movq 4*8(%rsp), %r14
+	CFI_RESTORE r14
+	movq 5*8(%rsp), %r13
+	CFI_RESTORE r13
+	movq 6*8(%rsp), %rbp
+	CFI_RESTORE rbp
+	addq $7*8, %rsp
+	CFI_ADJUST_CFA_OFFSET -7*8
+	ret
+	CFI_RESTORE_STATE
+
+	/* Exception handlers. Very simple, zeroing is done in the wrappers */
+.Lbad_source:
+	movq (%rsp), %rax
+	testq %rax, %rax
+	jz   .Lende
+	movl $-EFAULT, (%rax)
+	jmp  .Lende
+
+.Lbad_dest:
+	movq 8(%rsp), %rax
+	testq %rax, %rax
+	jz   .Lende
+	movl $-EFAULT, (%rax)
+	jmp .Lende
+	CFI_ENDPROC
+ENDPROC(csum_partial_copy_generic)