From 86297c41a26f18d924e64fc93321c59cbc4c48dd Mon Sep 17 00:00:00 2001
From: Thomas Bushnell <thomas@gnu.org>
Date: Mon, 26 Apr 1999 05:58:44 +0000
Subject: 1998-11-30  OKUJI Yoshinori  <okuji@kuicr.kyoto-u.ac.jp>

	Clean up linux emulation code to make it architecture-independent
	as much as possible.

	* linux: Renamed from linuxdev.
	* Makefile.in (objfiles): Add linux.o instead of linuxdev.o.
	(MAKE): New variable. Used for the linux.o target.
	* configure.in: Add AC_CHECK_TOOL(MAKE, make).
	* i386/i386/spl.h: Include <i386/ipl.h>, for compatibility with
	OSF Mach 3.0. Suggested by Elgin Lee <ehl@funghi.com>.
	* linux/src: Renamed from linux/linux.
	* linux/dev: Renamed from linux/mach.
	* linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h,
	instead of mach/include/linux/autoconf.h.
	* Makefile.in (all): Target ../linux.o instead of ../linuxdev.o.
	* linux/dev/drivers/block/genhd.c: Include <machine/spl.h> instead
	of <i386/ipl.h>.
	* linux/dev/drivers/net/auto_irq.c: Remove unneeded header files,
	<i386/ipl.h> and <i386/pic.h>.
	* linux/dev/init/main.c: Many i386-dependent codes moved to ...
	* linux/dev/arch/i386/irq.c: ... here.
	* linux/dev/arch/i386/setup.c: New file.
	* linux/dev/arch/i386/linux_emul.h: Likewise.
	* linux/dev/arch/i386/glue/timer.c: Merged into sched.c.
	* linux/dev/arch/i386/glue/sched.c: Include <machine/spl.h> instead
	of <i386/ipl.h>, and moved to ...
	* linux/dev/kernel/sched.c: ... here.
	* linux/dev/arch/i386/glue/block.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/blocl.c: ... here.
	* linux/dev/arch/i386/glue/net.c: Include <machine/spl.h> and
	<linux_emul.h>, instead of i386-dependent header files, and
	moved to ...
	* linux/dev/glue/net.c: ... here.
	* linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ...
	* linux/dev/glue/misc.c: ... here.
	* linux/dev/arch/i386/glue/kmem.c: Moved to ...
	* linux/dev/glue/kmem.c: ... here.
---
 linux/dev/include/asm-i386/string.h | 631 ++++++++++++++++++++++++++++++++++++
 1 file changed, 631 insertions(+)
 create mode 100644 linux/dev/include/asm-i386/string.h

(limited to 'linux/dev/include/asm-i386/string.h')

diff --git a/linux/dev/include/asm-i386/string.h b/linux/dev/include/asm-i386/string.h
new file mode 100644
index 00000000..144e86e4
--- /dev/null
+++ b/linux/dev/include/asm-i386/string.h
@@ -0,0 +1,631 @@
+#ifndef _I386_STRING_H_
+#define _I386_STRING_H_
+
+/*
+ * On a 486 or Pentium, we are better off not using the
+ * byte string operations. But on a 386 or a PPro the
+ * byte string ops are faster than doing it by hand
+ * (MUCH faster on a Pentium).
+ *
+ * Also, the byte strings actually work correctly. Forget
+ * the i486 routines for now as they may be broken..
+ */
+#if FIXED_486_STRING && (CPU == 486 || CPU == 586)
+#include <asm/string-486.h>
+#else
+
+/*
+ * This string-include defines all string functions as inline
+ * functions. Use gcc. It also assumes ds=es=data space, this should be
+ * normal. Most of the string-functions are rather heavily hand-optimized,
+ * see especially strtok,strstr,str[c]spn. They should work, but are not
+ * very easy to understand. Everything is done entirely within the register
+ * set, making the functions fast and clean. String instructions have been
+ * used through-out, making for "slightly" unclear code :-)
+ *
+ *		Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+#define __HAVE_ARCH_STRCPY
+extern inline char * strcpy(char * dest,const char *src)
+{
+__asm__ __volatile__(
+	"cld\n"
+	"1:\tlodsb\n\t"
+	"stosb\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b"
+	: /* no output */
+	:"S" (src),"D" (dest):"si","di","ax","memory");
+return dest;
+}
+
+#define __HAVE_ARCH_STRNCPY
+extern inline char * strncpy(char * dest,const char *src,size_t count)
+{
+__asm__ __volatile__(
+	"cld\n"
+	"1:\tdecl %2\n\t"
+	"js 2f\n\t"
+	"lodsb\n\t"
+	"stosb\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b\n\t"
+	"rep\n\t"
+	"stosb\n"
+	"2:"
+	: /* no output */
+	:"S" (src),"D" (dest),"c" (count):"si","di","ax","cx","memory");
+return dest;
+}
+
+#define __HAVE_ARCH_STRCAT
+extern inline char * strcat(char * dest,const char * src)
+{
+__asm__ __volatile__(
+	"cld\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"decl %1\n"
+	"1:\tlodsb\n\t"
+	"stosb\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b"
+	: /* no output */
+	:"S" (src),"D" (dest),"a" (0),"c" (0xffffffff):"si","di","ax","cx");
+return dest;
+}
+
+#define __HAVE_ARCH_STRNCAT
+extern inline char * strncat(char * dest,const char * src,size_t count)
+{
+__asm__ __volatile__(
+	"cld\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"decl %1\n\t"
+	"movl %4,%3\n"
+	"1:\tdecl %3\n\t"
+	"js 2f\n\t"
+	"lodsb\n\t"
+	"stosb\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b\n"
+	"2:\txorl %2,%2\n\t"
+	"stosb"
+	: /* no output */
+	:"S" (src),"D" (dest),"a" (0),"c" (0xffffffff),"g" (count)
+	:"si","di","ax","cx","memory");
+return dest;
+}
+
+#define __HAVE_ARCH_STRCMP
+extern inline int strcmp(const char * cs,const char * ct)
+{
+register int __res;
+__asm__ __volatile__(
+	"cld\n"
+	"1:\tlodsb\n\t"
+	"scasb\n\t"
+	"jne 2f\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b\n\t"
+	"xorl %%eax,%%eax\n\t"
+	"jmp 3f\n"
+	"2:\tsbbl %%eax,%%eax\n\t"
+	"orb $1,%%eax\n"
+	"3:"
+	:"=a" (__res):"S" (cs),"D" (ct):"si","di");
+return __res;
+}
+
+#define __HAVE_ARCH_STRNCMP
+extern inline int strncmp(const char * cs,const char * ct,size_t count)
+{
+register int __res;
+__asm__ __volatile__(
+	"cld\n"
+	"1:\tdecl %3\n\t"
+	"js 2f\n\t"
+	"lodsb\n\t"
+	"scasb\n\t"
+	"jne 3f\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b\n"
+	"2:\txorl %%eax,%%eax\n\t"
+	"jmp 4f\n"
+	"3:\tsbbl %%eax,%%eax\n\t"
+	"orb $1,%%al\n"
+	"4:"
+	:"=a" (__res):"S" (cs),"D" (ct),"c" (count):"si","di","cx");
+return __res;
+}
+
+#define __HAVE_ARCH_STRCHR
+extern inline char * strchr(const char * s, int c)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movb %%al,%%ah\n"
+	"1:\tlodsb\n\t"
+	"cmpb %%ah,%%al\n\t"
+	"je 2f\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b\n\t"
+	"movl $1,%1\n"
+	"2:\tmovl %1,%0\n\t"
+	"decl %0"
+	:"=a" (__res):"S" (s),"0" (c):"si");
+return __res;
+}
+
+#define __HAVE_ARCH_STRRCHR
+extern inline char * strrchr(const char * s, int c)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movb %%al,%%ah\n"
+	"1:\tlodsb\n\t"
+	"cmpb %%ah,%%al\n\t"
+	"jne 2f\n\t"
+	"leal -1(%%esi),%0\n"
+	"2:\ttestb %%al,%%al\n\t"
+	"jne 1b"
+	:"=d" (__res):"0" (0),"S" (s),"a" (c):"ax","si");
+return __res;
+}
+
+#define __HAVE_ARCH_STRSPN
+extern inline size_t strspn(const char * cs, const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"movl %%ecx,%%edx\n"
+	"1:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 2f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"je 1b\n"
+	"2:\tdecl %0"
+	:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
+	:"ax","cx","dx","di");
+return __res-cs;
+}
+
+#define __HAVE_ARCH_STRCSPN
+extern inline size_t strcspn(const char * cs, const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"movl %%ecx,%%edx\n"
+	"1:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 2f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"jne 1b\n"
+	"2:\tdecl %0"
+	:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
+	:"ax","cx","dx","di");
+return __res-cs;
+}
+
+#define __HAVE_ARCH_STRPBRK
+extern inline char * strpbrk(const char * cs,const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"movl %%ecx,%%edx\n"
+	"1:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 2f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"jne 1b\n\t"
+	"decl %0\n\t"
+	"jmp 3f\n"
+	"2:\txorl %0,%0\n"
+	"3:"
+	:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
+	:"ax","cx","dx","di");
+return __res;
+}
+
+#define __HAVE_ARCH_STRSTR
+extern inline char * strstr(const char * cs,const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"cld\n\t" \
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"	/* NOTE! This also sets Z if searchstring='' */
+	"movl %%ecx,%%edx\n"
+	"1:\tmovl %4,%%edi\n\t"
+	"movl %%esi,%%eax\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repe\n\t"
+	"cmpsb\n\t"
+	"je 2f\n\t"		/* also works for empty string, see above */
+	"xchgl %%eax,%%esi\n\t"
+	"incl %%esi\n\t"
+	"cmpb $0,-1(%%eax)\n\t"
+	"jne 1b\n\t"
+	"xorl %%eax,%%eax\n\t"
+	"2:"
+	:"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"D" (ct),
+	"g" (*cs), "g" (*ct)
+	:"cx","dx","di","si");
+return __res;
+}
+
+#define __HAVE_ARCH_STRLEN
+extern inline size_t strlen(const char * s)
+{
+register int __res;
+__asm__ __volatile__(
+	"cld\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %0\n\t"
+	"decl %0"
+	:"=c" (__res):"D" (s),"a" (0),"0" (0xffffffff):"di");
+return __res;
+}
+
+#define __HAVE_ARCH_STRTOK
+extern inline char * strtok(char * s,const char * ct)
+{
+register char * __res;
+__asm__ __volatile__(
+	"testl %1,%1\n\t"
+	"jne 1f\n\t"
+	"testl %0,%0\n\t"
+	"je 8f\n\t"
+	"movl %0,%1\n"
+	"1:\txorl %0,%0\n\t"
+	"movl $-1,%%ecx\n\t"
+	"xorl %%eax,%%eax\n\t"
+	"cld\n\t"
+	"movl %4,%%edi\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"notl %%ecx\n\t"
+	"decl %%ecx\n\t"
+	"je 7f\n\t"			/* empty delimiter-string */
+	"movl %%ecx,%%edx\n"
+	"2:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 7f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"je 2b\n\t"
+	"decl %1\n\t"
+	"cmpb $0,(%1)\n\t"
+	"je 7f\n\t"
+	"movl %1,%0\n"
+	"3:\tlodsb\n\t"
+	"testb %%al,%%al\n\t"
+	"je 5f\n\t"
+	"movl %4,%%edi\n\t"
+	"movl %%edx,%%ecx\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"jne 3b\n\t"
+	"decl %1\n\t"
+	"cmpb $0,(%1)\n\t"
+	"je 5f\n\t"
+	"movb $0,(%1)\n\t"
+	"incl %1\n\t"
+	"jmp 6f\n"
+	"5:\txorl %1,%1\n"
+	"6:\tcmpb $0,(%0)\n\t"
+	"jne 7f\n\t"
+	"xorl %0,%0\n"
+	"7:\ttestl %0,%0\n\t"
+	"jne 8f\n\t"
+	"movl %0,%1\n"
+	"8:"
+	:"=b" (__res),"=S" (___strtok)
+	:"0" (___strtok),"1" (s),"g" (ct)
+	:"ax","cx","dx","di","memory");
+return __res;
+}
+
+extern inline void * __memcpy(void * to, const void * from, size_t n)
+{
+__asm__ __volatile__(
+	"cld\n\t"
+	"rep ; movsl\n\t"
+	"testb $2,%b1\n\t"
+	"je 1f\n\t"
+	"movsw\n"
+	"1:\ttestb $1,%b1\n\t"
+	"je 2f\n\t"
+	"movsb\n"
+	"2:"
+	: /* no output */
+	:"c" (n/4), "q" (n),"D" ((long) to),"S" ((long) from)
+	: "cx","di","si","memory");
+return (to);
+}
+
+/*
+ * This looks horribly ugly, but the compiler can optimize it totally,
+ * as the count is constant.
+ */
+extern inline void * __constant_memcpy(void * to, const void * from, size_t n)
+{
+	switch (n) {
+		case 0:
+			return to;
+		case 1:
+			*(unsigned char *)to = *(const unsigned char *)from;
+			return to;
+		case 2:
+			*(unsigned short *)to = *(const unsigned short *)from;
+			return to;
+		case 3:
+			*(unsigned short *)to = *(const unsigned short *)from;
+			*(2+(unsigned char *)to) = *(2+(const unsigned char *)from);
+			return to;
+		case 4:
+			*(unsigned long *)to = *(const unsigned long *)from;
+			return to;
+		case 8:
+			*(unsigned long *)to = *(const unsigned long *)from;
+			*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
+			return to;
+		case 12:
+			*(unsigned long *)to = *(const unsigned long *)from;
+			*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
+			*(2+(unsigned long *)to) = *(2+(const unsigned long *)from);
+			return to;
+		case 16:
+			*(unsigned long *)to = *(const unsigned long *)from;
+			*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
+			*(2+(unsigned long *)to) = *(2+(const unsigned long *)from);
+			*(3+(unsigned long *)to) = *(3+(const unsigned long *)from);
+			return to;
+		case 20:
+			*(unsigned long *)to = *(const unsigned long *)from;
+			*(1+(unsigned long *)to) = *(1+(const unsigned long *)from);
+			*(2+(unsigned long *)to) = *(2+(const unsigned long *)from);
+			*(3+(unsigned long *)to) = *(3+(const unsigned long *)from);
+			*(4+(unsigned long *)to) = *(4+(const unsigned long *)from);
+			return to;
+	}
+#define COMMON(x) \
+__asm__("cld\n\t" \
+	"rep ; movsl" \
+	x \
+	: /* no outputs */ \
+	: "c" (n/4),"D" ((long) to),"S" ((long) from) \
+	: "cx","di","si","memory");
+
+	switch (n % 4) {
+		case 0: COMMON(""); return to;
+		case 1: COMMON("\n\tmovsb"); return to;
+		case 2: COMMON("\n\tmovsw"); return to;
+		default: COMMON("\n\tmovsw\n\tmovsb"); return to;
+	}
+#undef COMMON
+}
+
+#define __HAVE_ARCH_MEMCPY
+#define memcpy(t, f, n) \
+(__builtin_constant_p(n) ? \
+ __constant_memcpy((t),(f),(n)) : \
+ __memcpy((t),(f),(n)))
+
+#define __HAVE_ARCH_MEMMOVE
+extern inline void * memmove(void * dest,const void * src, size_t n)
+{
+if (dest<src)
+__asm__ __volatile__(
+	"cld\n\t"
+	"rep\n\t"
+	"movsb"
+	: /* no output */
+	:"c" (n),"S" (src),"D" (dest)
+	:"cx","si","di");
+else
+__asm__ __volatile__(
+	"std\n\t"
+	"rep\n\t"
+	"movsb\n\t"
+	"cld"
+	: /* no output */
+	:"c" (n),
+	 "S" (n-1+(const char *)src),
+	 "D" (n-1+(char *)dest)
+	:"cx","si","di","memory");
+return dest;
+}
+
+#define memcmp __builtin_memcmp
+
+#define __HAVE_ARCH_MEMCHR
+extern inline void * memchr(const void * cs,int c,size_t count)
+{
+register void * __res;
+if (!count)
+	return NULL;
+__asm__ __volatile__(
+	"cld\n\t"
+	"repne\n\t"
+	"scasb\n\t"
+	"je 1f\n\t"
+	"movl $1,%0\n"
+	"1:\tdecl %0"
+	:"=D" (__res):"a" (c),"D" (cs),"c" (count)
+	:"cx");
+return __res;
+}
+
+extern inline void * __memset_generic(void * s, char c,size_t count)
+{
+__asm__ __volatile__(
+	"cld\n\t"
+	"rep\n\t"
+	"stosb"
+	: /* no output */
+	:"a" (c),"D" (s),"c" (count)
+	:"cx","di","memory");
+return s;
+}
+
+/* we might want to write optimized versions of these later */
+#define __constant_count_memset(s,c,count) __memset_generic((s),(c),(count))
+
+/*
+ * memset(x,0,y) is a reasonably common thing to do, so we want to fill
+ * things 32 bits at a time even when we don't know the size of the
+ * area at compile-time..
+ */
+extern inline void * __constant_c_memset(void * s, unsigned long c, size_t count)
+{
+__asm__ __volatile__(
+	"cld\n\t"
+	"rep ; stosl\n\t"
+	"testb $2,%b1\n\t"
+	"je 1f\n\t"
+	"stosw\n"
+	"1:\ttestb $1,%b1\n\t"
+	"je 2f\n\t"
+	"stosb\n"
+	"2:"
+	: /* no output */
+	:"a" (c), "q" (count), "c" (count/4), "D" ((long) s)
+	:"cx","di","memory");
+return (s);	
+}
+
+/* Added by Gertjan van Wingerde to make minix and sysv module work */
+#define __HAVE_ARCH_STRNLEN
+extern inline size_t strnlen(const char * s, size_t count)
+{
+register int __res;
+__asm__ __volatile__(
+	"movl %1,%0\n\t"
+	"jmp 2f\n"
+	"1:\tcmpb $0,(%0)\n\t"
+	"je 3f\n\t"
+	"incl %0\n"
+	"2:\tdecl %2\n\t"
+	"cmpl $-1,%2\n\t"
+	"jne 1b\n"
+	"3:\tsubl %1,%0"
+	:"=a" (__res)
+	:"c" (s),"d" (count)
+	:"dx");
+return __res;
+}
+/* end of additional stuff */
+
+/*
+ * This looks horribly ugly, but the compiler can optimize it totally,
+ * as we by now know that both pattern and count is constant..
+ */
+extern inline void * __constant_c_and_count_memset(void * s, unsigned long pattern, size_t count)
+{
+	switch (count) {
+		case 0:
+			return s;
+		case 1:
+			*(unsigned char *)s = pattern;
+			return s;
+		case 2:
+			*(unsigned short *)s = pattern;
+			return s;
+		case 3:
+			*(unsigned short *)s = pattern;
+			*(2+(unsigned char *)s) = pattern;
+			return s;
+		case 4:
+			*(unsigned long *)s = pattern;
+			return s;
+	}
+#define COMMON(x) \
+__asm__("cld\n\t" \
+	"rep ; stosl" \
+	x \
+	: /* no outputs */ \
+	: "a" (pattern),"c" (count/4),"D" ((long) s) \
+	: "cx","di","memory")
+
+	switch (count % 4) {
+		case 0: COMMON(""); return s;
+		case 1: COMMON("\n\tstosb"); return s;
+		case 2: COMMON("\n\tstosw"); return s;
+		default: COMMON("\n\tstosw\n\tstosb"); return s;
+	}
+#undef COMMON
+}
+
+#define __constant_c_x_memset(s, c, count) \
+(__builtin_constant_p(count) ? \
+ __constant_c_and_count_memset((s),(c),(count)) : \
+ __constant_c_memset((s),(c),(count)))
+
+#define __memset(s, c, count) \
+(__builtin_constant_p(count) ? \
+ __constant_count_memset((s),(c),(count)) : \
+ __memset_generic((s),(c),(count)))
+
+#define __HAVE_ARCH_MEMSET
+#define memset(s, c, count) \
+(__builtin_constant_p(c) ? \
+ __constant_c_x_memset((s),(0x01010101UL*(unsigned char)c),(count)) : \
+ __memset((s),(c),(count)))
+
+/*
+ * find the first occurrence of byte 'c', or 1 past the area if none
+ */
+#define __HAVE_ARCH_MEMSCAN
+extern inline void * memscan(void * addr, int c, size_t size)
+{
+	if (!size)
+		return addr;
+	__asm__("cld
+		repnz; scasb
+		jnz 1f
+		dec %%edi
+1:		"
+		: "=D" (addr), "=c" (size)
+		: "0" (addr), "1" (size), "a" (c));
+	return addr;
+}
+
+#endif
+#endif
-- 
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