From: Arun Thomas <arun@minix3.org>
Date: Fri, 10 Aug 2012 12:47:56 +0000 (+0200)
Subject: Restore and use C version of oneC_sum
X-Git-Tag: v3.2.1~393
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zpipe.c?a=commitdiff_plain;h=ad95bad8f7210c78627ee90523388b2d51f997fb;p=minix.git

Restore and use C version of oneC_sum
---

diff --git a/lib/libminlib/Makefile b/lib/libminlib/Makefile
index 6a28afa31..4d850e211 100644
--- a/lib/libminlib/Makefile
+++ b/lib/libminlib/Makefile
@@ -1,5 +1,5 @@
 .include <bsd.own.mk>
-.PATH: 	${.CURDIR} ${.CURDIR}/${MACHINE}
+.PATH: 	${.CURDIR} ${.CURDIR}/${MACHINE_ARCH}
 INCSDIR= /usr/include
 LIB=	minlib
 
@@ -31,9 +31,12 @@ SRCS+= paramvalue.c
 SRCS+= 	getngid.c getnpid.c getnprocnr.c getnucred.c getnuid.c getprocnr.c \
 	mapdriver.c vm_memctl.c vm_set_priv.c vm_query_exit.c vm_update.c
 
+
+SRCS+= oneC_sum.c
+
 INCS+= tools.h
 
-.include "${MACHINE}/Makefile.inc"
+.include "${MACHINE_ARCH}/Makefile.inc"
 
 .include <bsd.own.mk>
 SUBDIR+= pkgconfig
diff --git a/lib/libminlib/i386/Makefile.inc b/lib/libminlib/i386/Makefile.inc
index a603b4019..9c252f948 100644
--- a/lib/libminlib/i386/Makefile.inc
+++ b/lib/libminlib/i386/Makefile.inc
@@ -1,2 +1,2 @@
 SRCS+= 	_cpufeature.c _cpuid.S get_bp.S getprocessor.S \
-	oneC_sum.S read_tsc.S read_tsc_64.c
+	read_tsc.S read_tsc_64.c
diff --git a/lib/libminlib/i386/oneC_sum.S b/lib/libminlib/i386/oneC_sum.S
deleted file mode 100644
index 518fa0088..000000000
--- a/lib/libminlib/i386/oneC_sum.S
+++ /dev/null
@@ -1,88 +0,0 @@
-/*	oneC_sum() - One complement`s checksum		Author: Kees J. Bot */
-/*								9 May 1995 */
-/* See RFC 1071, "Computing the Internet checksum" */
-/* See also the C version of this code. */
-#include <machine/asm.h>
-
-ENTRY(oneC_sum)
-	push	%ebp
-	movl	%esp, %ebp
-	push	%esi
-	push	%edi
-	movzwl	8(%ebp), %eax	/* Checksum of previous block */
-	movl	12(%ebp), %esi	/* Data to compute checksum over */
-	movl	16(%ebp), %edi	/* Number of bytes */
-
-	xorl	%edx, %edx
-	xorb	%cl, %cl
-align:
-	testl	$3, %esi	/* Is the data aligned? */
-	je	aligned
-	testl	%edi, %edi
-	je	0f
-	movb	(%esi), %dl	/* Rotate the first unaligned bytes */
-	decl	%edi	/* into the edx register */
-0:
-	incl	%esi
-	rorl	$8, %edx
-	rorl	$8, %eax	/* Rotate the checksum likewise */
-	addb	$8, %cl	/* Number of bits rotated */
-	jmp	align
-aligned:
-	addl	%edx, %eax	/* Summate the unaligned bytes */
-	adcl	$0, %eax	/* Add carry back in for one`s complement */
-
-	jmp	add6test
-_ALIGN_TEXT
-add6:
-	addl	(%esi), %eax	/* Six times unrolled loop, see below */
-	adcl	4(%esi), %eax
-	adcl	8(%esi), %eax
-	adcl	12(%esi), %eax
-	adcl	16(%esi), %eax
-	adcl	20(%esi), %eax
-	adcl	$0, %eax
-	addl	$24, %esi
-add6test:
-	subl	$24, %edi
-	jae	add6
-	addl	$24, %edi
-
-	jmp	add1test
-_ALIGN_TEXT
-add1:
-	addl	(%esi), %eax	/* while ((edi -= 4) >= 0) */
-	adcl	$0, %eax	/*	eax += *esi++; */
-	addl	$4, %esi	/* edi += 4; */
-add1test:
-	subl	$4, %edi
-	jae	add1
-	addl	$4, %edi
-
-	je	done	/* Are there extra bytes? */
-	movl	(%esi), %edx	/* Load extra bytes in a full dword */
-	andl	mask-4(,%edi,4), %edx	/* Mask off excess */
-	addl	%edx, %eax	/* Add in the last bits */
-	adcl	$0, %eax
-done:
-	roll	%cl, %eax	/* Undo the rotation at the beginning */
-	movl	%eax, %edx
-	shrl	$16, %eax
-	addw	%dx, %ax	/* Add the two words in eax to form */
-	adcw	$0, %ax	/* a 16 bit sum */
-	pop	%edi
-	pop	%esi
-	pop	%ebp
-	ret
-
-#ifdef __ACK__
-.rom
-#else
-.data
-#endif
-.balign 4
-mask:
-.long	0x000000FF, 0x0000FFFF, 0x00FFFFFF
-
-/* */
-/* $PchId: oneC_sum.ack.s,v 1.2 1996/03/12 19:33:51 philip Exp $ */
diff --git a/lib/libminlib/oneC_sum.c b/lib/libminlib/oneC_sum.c
new file mode 100644
index 000000000..702b9d35b
--- /dev/null
+++ b/lib/libminlib/oneC_sum.c
@@ -0,0 +1,61 @@
+/*	oneC_sum() - One complement's checksum		Author: Kees J. Bot
+ *								8 May 1995
+ * See RFC 1071, "Computing the Internet checksum"
+ */
+
+#include <sys/types.h>
+#include <net/gen/oneCsum.h>
+
+u16_t oneC_sum(u16_t prev, void *data, size_t size)
+{
+	u8_t *dptr;
+	size_t n;
+	u16_t word;
+	u32_t sum;
+	int swap= 0;
+
+	sum= prev;
+	dptr= data;
+	n= size;
+
+	swap= ((size_t) dptr & 1);
+	if (swap) {
+		sum= ((sum & 0xFF) << 8) | ((sum & 0xFF00) >> 8);
+		if (n > 0) {
+			((u8_t *) &word)[0]= 0;
+			((u8_t *) &word)[1]= dptr[0];
+			sum+= (u32_t) word;
+			dptr+= 1;
+			n-= 1;
+		}
+	}
+
+	while (n >= 8) {
+		sum+= (u32_t) ((u16_t *) dptr)[0]
+		    + (u32_t) ((u16_t *) dptr)[1]
+		    + (u32_t) ((u16_t *) dptr)[2]
+		    + (u32_t) ((u16_t *) dptr)[3];
+		dptr+= 8;
+		n-= 8;
+	}
+
+	while (n >= 2) {
+		sum+= (u32_t) ((u16_t *) dptr)[0];
+		dptr+= 2;
+		n-= 2;
+	}
+
+	if (n > 0) {
+		((u8_t *) &word)[0]= dptr[0];
+		((u8_t *) &word)[1]= 0;
+		sum+= (u32_t) word;
+	}
+
+	sum= (sum & 0xFFFF) + (sum >> 16);
+	if (sum > 0xFFFF) sum++;
+
+	if (swap) {
+		sum= ((sum & 0xFF) << 8) | ((sum & 0xFF00) >> 8);
+	}
+	return sum;
+}