Import of Linus's Linux 1.1.68

1 files changed, 217 insertions, 0 deletions

diff --git a/include/asm-mips/segment.h b/include/asm-mips/segment.h
new file mode 100644
index 000000000..8b29ad0b2
--- /dev/null
+++ b/include/asm-mips/segment.h
@@ -0,0 +1,217 @@
+/*
+ * include/asm-mips/segment.h
+ *
+ * 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.
+ *
+ * Copyright (C) 1994 by Ralf Baechle
+ *
+ */
+
+#ifndef _ASM_MIPS_SEGMENT_H_
+#define _ASM_MIPS_SEGMENT_H_
+
+static inline unsigned char get_user_byte(const char * addr)
+{
+	register unsigned char _v;
+
+	__asm__ ("lbu\t%0,%1":"=r" (_v):"r" (*addr));
+
+	return _v;
+}
+
+#define get_fs_byte(addr) get_user_byte((char *)(addr))
+
+static inline unsigned short get_user_word(const short *addr)
+{
+	unsigned short _v;
+
+	__asm__ ("lhu\t%0,%1":"=r" (_v):"r" (*addr));
+
+	return _v;
+}
+
+#define get_fs_word(addr) get_user_word((short *)(addr))
+
+static inline unsigned long get_user_long(const int *addr)
+{
+	unsigned long _v;
+
+	__asm__ ("lwu\t%0,%1":"=r" (_v):"r" (*addr)); \
+	return _v;
+}
+
+#define get_fs_long(addr) get_user_long((int *)(addr))
+
+static inline unsigned long get_user_dlong(const int *addr)
+{
+	unsigned long _v;
+
+	__asm__ ("ld\t%0,%1":"=r" (_v):"r" (*addr)); \
+	return _v;
+}
+
+#define get_fs_dlong(addr) get_user_dlong((int *)(addr))
+
+static inline void put_user_byte(char val,char *addr)
+{
+__asm__ ("sb\t%0,%1": /* no outputs */ :"r" (val),"r" (*addr));
+}
+
+#define put_fs_byte(x,addr) put_user_byte((x),(char *)(addr))
+
+static inline void put_user_word(short val,short * addr)
+{
+__asm__ ("sh\t%0,%1": /* no outputs */ :"r" (val),"r" (*addr));
+}
+
+#define put_fs_word(x,addr) put_user_word((x),(short *)(addr))
+
+static inline void put_user_long(unsigned long val,int * addr)
+{
+__asm__ ("sw\t%0,%1": /* no outputs */ :"r" (val),"r" (*addr));
+}
+
+#define put_fs_long(x,addr) put_user_long((x),(int *)(addr))
+
+static inline void put_user_dlong(unsigned long val,int * addr)
+{
+__asm__ ("sd\t%0,%1": /* no outputs */ :"r" (val),"r" (*addr));
+}
+
+#define put_fs_dlong(x,addr) put_user_dlong((x),(int *)(addr))
+
+/*
+ * These following two variables are defined in mips/head.S.
+ */
+extern unsigned long segment_fs;
+
+static inline void __generic_memcpy_tofs(void * to, const void * from, unsigned long n)
+{
+  __asm__(
+	".set\tnoreorder\n\t"
+	".set\tnoat\n"
+	"1:\tlbu\t$1,(%2)\n\t"
+	"addiu\t%2,%2,1\n\t"
+	"sb\t$1,(%1)\n\t"
+	"addiu\t%0,%0,-1\n\t"
+	"bne\t$0,%0,1b\n\t"
+	"addiu\t%1,%1,1\n\t"
+	".set\tat\n\t"
+	".set\treorder"
+	: /* no outputs */
+	:"d" (n),"d" (((long) to)| segment_fs),"d" ((long) from)
+	:"$1");
+}
+
+static inline void __constant_memcpy_tofs(void * to, const void * from, unsigned long n)
+{
+	/*
+	 * Use put_user_byte to avoid trouble with alignment.
+	 */
+	switch (n) {
+		case 0:
+			return;
+		case 1:
+			put_user_byte(*(const char *) from, (char *) to);
+			return;
+		case 2:
+			put_user_byte(*(const char *) from, (char *) to);
+			put_user_byte(*(1+(const char *) from), 1+(char *) to);
+			return;
+		case 3:
+			put_user_byte(*((const char *) from), (char *) to);
+			put_user_byte(*(1+(const char *) from), 1+(char *) to);
+			put_user_byte(*(2+(const char *) from), 2+(char *) to);
+			return;
+		case 4:
+			put_user_byte(*((const char *) from), (char *) to);
+			put_user_byte(*(1+(const char *) from), 1+(char *) to);
+			put_user_byte(*(2+(const char *) from), 2+(char *) to);
+			put_user_byte(*(3+(const char *) from), 3+(char *) to);
+			return;
+	}
+
+	__generic_memcpy_tofs(to, from, n);
+
+	return;
+}
+
+static inline void __generic_memcpy_fromfs(void * to, const void * from, unsigned long n)
+{
+  __asm__(
+	".set\tnoreorder\n\t"
+	".set\tnoat\n"
+	"1:\tlbu\t$1,(%2)\n\t"
+	"addiu\t%2,%2,1\n\t"
+	"sb\t$1,(%1)\n\t"
+	"addiu\t%0,%0,-1\n\t"
+	"bne\t$0,%0,1b\n\t"
+	"addiu\t%1,%1,1\n\t"
+	".set\tat\n\t"
+	".set\treorder"
+	: /* no outputs */
+	:"d" (n),"d" ((long) to),"d" (((long) from | segment_fs))
+	:"$1","memory");
+}
+
+static inline void __constant_memcpy_fromfs(void * to, const void * from, unsigned long n)
+{
+	/*
+	 * Use put_user_byte to avoid trouble with alignment.
+	 */
+	switch (n) {
+		case 0:
+			return;
+		case 1:
+			*(char *)to = get_user_byte((const char *) from);
+			return;
+		case 2:
+			*(char *) to = get_user_byte((const char *) from);
+			*(char *) to = get_user_byte(1+(const char *) from);
+			return;
+		case 3:
+			*(char *) to = get_user_byte((const char *) from);
+			*(char *) to = get_user_byte(1+(const char *) from);
+			*(char *) to = get_user_byte(2+(const char *) from);
+			return;
+		case 4:
+			*(char *) to = get_user_byte((const char *) from);
+			*(char *) to = get_user_byte(1+(const char *) from);
+			*(char *) to = get_user_byte(2+(const char *) from);
+			*(char *) to = get_user_byte(3+(const char *) from);
+			return;
+	}
+
+	
+	__generic_memcpy_fromfs(to, from, n);
+	return;
+}
+
+#define memcpy_fromfs(to, from, n) \
+(__builtin_constant_p(n) ? \
+ __constant_memcpy_fromfs((to),(from),(n)) : \
+ __generic_memcpy_fromfs((to),(from),(n)))
+
+#define memcpy_tofs(to, from, n) \
+(__builtin_constant_p(n) ? \
+ __constant_memcpy_tofs((to),(from),(n)) : \
+ __generic_memcpy_tofs((to),(from),(n)))
+
+static inline unsigned long get_fs(void)
+{
+	return segment_fs;
+}
+
+static inline unsigned long get_ds(void)
+{
+	return KERNEL_DS;
+}
+
+static inline void set_fs(unsigned long val)
+{
+	segment_fs = val;
+}
+
+#endif /* _ASM_MIPS_SEGMENT_H_ */