1 files changed, 339 insertions, 0 deletions
diff --git a/linux/src/include/asm-i386/segment.h b/linux/src/include/asm-i386/segment.h
new file mode 100644
index 0000000..6052ad4
--- /dev/null
+++ b/linux/src/include/asm-i386/segment.h
@@ -0,0 +1,339 @@
+#ifndef _ASM_SEGMENT_H
+#define _ASM_SEGMENT_H
+
+#define KERNEL_CS	0x10
+#define KERNEL_DS	0x18
+
+#define USER_CS		0x23
+#define USER_DS		0x2B
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Uh, these should become the main single-value transfer routines..
+ * They automatically use the right size if we just have the right
+ * pointer type..
+ */
+#define put_user(x,ptr) __put_user((unsigned long)(x),(ptr),sizeof(*(ptr)))
+#define get_user(ptr) ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr))))
+
+/*
+ * This is a silly but good way to make sure that
+ * the __put_user function is indeed always optimized,
+ * and that we use the correct sizes..
+ */
+extern int bad_user_access_length(void);
+
+/*
+ * dummy pointer type structure.. gcc won't try to do something strange
+ * this way..
+ */
+struct __segment_dummy { unsigned long a[100]; };
+#define __sd(x) ((struct __segment_dummy *) (x))
+#define __const_sd(x) ((const struct __segment_dummy *) (x))
+
+static inline void __put_user(unsigned long x, void * y, int size)
+{
+	switch (size) {
+		case 1:
+			__asm__ ("movb %b1,%%fs:%0"
+				:"=m" (*__sd(y))
+				:"iq" ((unsigned char) x), "m" (*__sd(y)));
+			break;
+		case 2:
+			__asm__ ("movw %w1,%%fs:%0"
+				:"=m" (*__sd(y))
+				:"ir" ((unsigned short) x), "m" (*__sd(y)));
+			break;
+		case 4:
+			__asm__ ("movl %1,%%fs:%0"
+				:"=m" (*__sd(y))
+				:"ir" (x), "m" (*__sd(y)));
+			break;
+		default:
+			bad_user_access_length();
+	}
+}
+
+static inline unsigned long __get_user(const void * y, int size)
+{
+	unsigned long result;
+
+	switch (size) {
+		case 1:
+			__asm__ ("movb %%fs:%1,%b0"
+				:"=q" (result)
+				:"m" (*__const_sd(y)));
+			return (unsigned char) result;
+		case 2:
+			__asm__ ("movw %%fs:%1,%w0"
+				:"=r" (result)
+				:"m" (*__const_sd(y)));
+			return (unsigned short) result;
+		case 4:
+			__asm__ ("movl %%fs:%1,%0"
+				:"=r" (result)
+				:"m" (*__const_sd(y)));
+			return result;
+		default:
+			return bad_user_access_length();
+	}
+}
+
+static inline void __generic_memcpy_tofs(void * to, const void * from, unsigned long n)
+{
+    __asm__ volatile
+	("	cld
+		push %%es
+		push %%fs
+		cmpl $3,%0
+		pop %%es
+		jbe 1f
+		movl %%edi,%%ecx
+		negl %%ecx
+		andl $3,%%ecx
+		subl %%ecx,%0
+		rep; movsb
+		movl %0,%%ecx
+		shrl $2,%%ecx
+		rep; movsl
+		andl $3,%0
+	1:	movl %0,%%ecx
+		rep; movsb
+		pop %%es"
+	:"=abd" (n)
+	:"0" (n),"D" ((long) to),"S" ((long) from)
+	:"cx","di","si");
+}
+
+static inline void __constant_memcpy_tofs(void * to, const void * from, unsigned long n)
+{
+	switch (n) {
+		case 0:
+			return;
+		case 1:
+			__put_user(*(const char *) from, (char *) to, 1);
+			return;
+		case 2:
+			__put_user(*(const short *) from, (short *) to, 2);
+			return;
+		case 3:
+			__put_user(*(const short *) from, (short *) to, 2);
+			__put_user(*(2+(const char *) from), 2+(char *) to, 1);
+			return;
+		case 4:
+			__put_user(*(const int *) from, (int *) to, 4);
+			return;
+		case 8:
+			__put_user(*(const int *) from, (int *) to, 4);
+			__put_user(*(1+(const int *) from), 1+(int *) to, 4);
+			return;
+		case 12:
+			__put_user(*(const int *) from, (int *) to, 4);
+			__put_user(*(1+(const int *) from), 1+(int *) to, 4);
+			__put_user(*(2+(const int *) from), 2+(int *) to, 4);
+			return;
+		case 16:
+			__put_user(*(const int *) from, (int *) to, 4);
+			__put_user(*(1+(const int *) from), 1+(int *) to, 4);
+			__put_user(*(2+(const int *) from), 2+(int *) to, 4);
+			__put_user(*(3+(const int *) from), 3+(int *) to, 4);
+			return;
+	}
+#define COMMON(x) \
+__asm__("cld\n\t" \
+	"push %%es\n\t" \
+	"push %%fs\n\t" \
+	"pop %%es\n\t" \
+	"rep ; movsl\n\t" \
+	x \
+	"pop %%es" \
+	: /* no outputs */ \
+	:"c" (n/4),"D" ((long) to),"S" ((long) from) \
+	:"cx","di","si")
+
+	switch (n % 4) {
+		case 0:
+			COMMON("");
+			return;
+		case 1:
+			COMMON("movsb\n\t");
+			return;
+		case 2:
+			COMMON("movsw\n\t");
+			return;
+		case 3:
+			COMMON("movsw\n\tmovsb\n\t");
+			return;
+	}
+#undef COMMON
+}
+
+static inline void __generic_memcpy_fromfs(void * to, const void * from, unsigned long n)
+{
+    __asm__ volatile
+	("	cld
+		cmpl $3,%0
+		jbe 1f
+		movl %%edi,%%ecx
+		negl %%ecx
+		andl $3,%%ecx
+		subl %%ecx,%0
+		fs; rep; movsb
+		movl %0,%%ecx
+		shrl $2,%%ecx
+		fs; rep; movsl
+		andl $3,%0
+	1:	movl %0,%%ecx
+		fs; rep; movsb"
+	:"=abd" (n)
+	:"0" (n),"D" ((long) to),"S" ((long) from)
+	:"cx","di","si", "memory");
+}
+
+static inline void __constant_memcpy_fromfs(void * to, const void * from, unsigned long n)
+{
+	switch (n) {
+		case 0:
+			return;
+		case 1:
+			*(char *)to = __get_user((const char *) from, 1);
+			return;
+		case 2:
+			*(short *)to = __get_user((const short *) from, 2);
+			return;
+		case 3:
+			*(short *) to = __get_user((const short *) from, 2);
+			*((char *) to + 2) = __get_user(2+(const char *) from, 1);
+			return;
+		case 4:
+			*(int *) to = __get_user((const int *) from, 4);
+			return;
+		case 8:
+			*(int *) to = __get_user((const int *) from, 4);
+			*(1+(int *) to) = __get_user(1+(const int *) from, 4);
+			return;
+		case 12:
+			*(int *) to = __get_user((const int *) from, 4);
+			*(1+(int *) to) = __get_user(1+(const int *) from, 4);
+			*(2+(int *) to) = __get_user(2+(const int *) from, 4);
+			return;
+		case 16:
+			*(int *) to = __get_user((const int *) from, 4);
+			*(1+(int *) to) = __get_user(1+(const int *) from, 4);
+			*(2+(int *) to) = __get_user(2+(const int *) from, 4);
+			*(3+(int *) to) = __get_user(3+(const int *) from, 4);
+			return;
+	}
+#define COMMON(x) \
+__asm__("cld\n\t" \
+	"rep ; fs ; movsl\n\t" \
+	x \
+	: /* no outputs */ \
+	:"c" (n/4),"D" ((long) to),"S" ((long) from) \
+	:"cx","di","si","memory")
+
+	switch (n % 4) {
+		case 0:
+			COMMON("");
+			return;
+		case 1:
+			COMMON("fs ; movsb");
+			return;
+		case 2:
+			COMMON("fs ; movsw");
+			return;
+		case 3:
+			COMMON("fs ; movsw\n\tfs ; movsb");
+			return;
+	}
+#undef COMMON
+}
+
+#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)))
+
+/*
+ * These are deprecated..
+ *
+ * Use "put_user()" and "get_user()" with the proper pointer types instead.
+ */
+
+#define get_fs_byte(addr) __get_user((const unsigned char *)(addr),1)
+#define get_fs_word(addr) __get_user((const unsigned short *)(addr),2)
+#define get_fs_long(addr) __get_user((const unsigned int *)(addr),4)
+
+#define put_fs_byte(x,addr) __put_user((x),(unsigned char *)(addr),1)
+#define put_fs_word(x,addr) __put_user((x),(unsigned short *)(addr),2)
+#define put_fs_long(x,addr) __put_user((x),(unsigned int *)(addr),4)
+
+#ifdef WE_REALLY_WANT_TO_USE_A_BROKEN_INTERFACE
+
+static inline unsigned short get_user_word(const short *addr)
+{
+	return __get_user(addr, 2);
+}
+
+static inline unsigned char get_user_byte(const char * addr)
+{
+	return __get_user(addr,1);
+}
+
+static inline unsigned long get_user_long(const int *addr)
+{
+	return __get_user(addr, 4);
+}
+
+static inline void put_user_byte(char val,char *addr)
+{
+	__put_user(val, addr, 1);
+}
+
+static inline void put_user_word(short val,short * addr)
+{
+	__put_user(val, addr, 2);
+}
+
+static inline void put_user_long(unsigned long val,int * addr)
+{
+	__put_user(val, addr, 4);
+}
+
+#endif
+
+/*
+ * Someone who knows GNU asm better than I should double check the following.
+ * It seems to work, but I don't know if I'm doing something subtly wrong.
+ * --- TYT, 11/24/91
+ * [ nothing wrong here, Linus: I just changed the ax to be any reg ]
+ */
+
+static inline unsigned long get_fs(void)
+{
+	unsigned long _v;
+	__asm__("mov %%fs,%w0":"=r" (_v):"0" (0));
+	return _v;
+}
+
+static inline unsigned long get_ds(void)
+{
+	unsigned long _v;
+	__asm__("mov %%ds,%w0":"=r" (_v):"0" (0));
+	return _v;
+}
+
+static inline void set_fs(unsigned long val)
+{
+	__asm__ __volatile__("mov %w0,%%fs": /* no output */ :"r" (val));
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_SEGMENT_H */