Initial revision

2005-04-21 14:53:53 +00:00
commit 9865aeaa79
2264 changed files with 411685 additions and 0 deletions
--- a/lib/i86/string/memset.s
+++ b/lib/i86/string/memset.s
@@ -0,0 +1,31 @@
+!	memset()					Author: Kees J. Bot
+!								27 Jan 1994
+.sect .text; .sect .rom; .sect .data; .sect .bss
+
+! void *memset(void *s, int c, size_t n)
+!	Set a chunk of memory to the same byte value.
+!
+.sect .text
+.define _memset
+_memset:
+	push	bp
+	mov	bp, sp
+	push	di
+	mov	di, 4(bp)	! The string
+	movb	al, 6(bp)	! The fill byte
+	mov	cx, 8(bp)	! Length
+	cld
+	cmp	cx, #16
+	jb	sbyte		! Don't bother being smart with short arrays
+	test	di, #1
+	jnz	sbyte		! Bit 0 set, use byte store
+sword:	movb	ah, al		! One byte to two bytes
+	sar	cx, #1
+    rep	stos			! Store words
+    	adc	cx, cx		! One more byte?
+sbyte:
+    rep	stosb			! Store bytes
+done:	mov	ax, 4(bp)	! Return some value you have no need for
+	pop	di
+	pop	bp
+	ret