1 files changed, 97 insertions, 0 deletions
diff --git a/include/asm-sh/system_32.h b/include/asm-sh/system_32.h
new file mode 100644
index 000000000000..ad37e8d5f31e
--- /dev/null
+++ b/include/asm-sh/system_32.h
@@ -0,0 +1,97 @@
+#ifndef __ASM_SH_SYSTEM_32_H
+#define __ASM_SH_SYSTEM_32_H
+
+#include <linux/types.h>
+
+struct task_struct *__switch_to(struct task_struct *prev,
+				struct task_struct *next);
+
+/*
+ *	switch_to() should switch tasks to task nr n, first
+ */
+#define switch_to(prev, next, last)				\
+do {								\
+	register u32 *__ts1 __asm__ ("r1") = &prev->thread.sp;	\
+	register u32 *__ts2 __asm__ ("r2") = &prev->thread.pc;	\
+	register u32 *__ts4 __asm__ ("r4") = (u32 *)prev;	\
+	register u32 *__ts5 __asm__ ("r5") = (u32 *)next;	\
+	register u32 *__ts6 __asm__ ("r6") = &next->thread.sp;	\
+	register u32 __ts7 __asm__ ("r7") = next->thread.pc;	\
+	struct task_struct *__last;				\
+								\
+	__asm__ __volatile__ (					\
+		".balign 4\n\t"					\
+		"stc.l	gbr, @-r15\n\t"				\
+		"sts.l	pr, @-r15\n\t"				\
+		"mov.l	r8, @-r15\n\t"				\
+		"mov.l	r9, @-r15\n\t"				\
+		"mov.l	r10, @-r15\n\t"				\
+		"mov.l	r11, @-r15\n\t"				\
+		"mov.l	r12, @-r15\n\t"				\
+		"mov.l	r13, @-r15\n\t"				\
+		"mov.l	r14, @-r15\n\t"				\
+		"mov.l	r15, @r1\t! save SP\n\t"		\
+		"mov.l	@r6, r15\t! change to new stack\n\t"	\
+		"mova	1f, %0\n\t"				\
+		"mov.l	%0, @r2\t! save PC\n\t"			\
+		"mov.l	2f, %0\n\t"				\
+		"jmp	@%0\t! call __switch_to\n\t"		\
+		" lds	r7, pr\t!  with return to new PC\n\t"	\
+		".balign	4\n"				\
+		"2:\n\t"					\
+		".long	__switch_to\n"				\
+		"1:\n\t"					\
+		"mov.l	@r15+, r14\n\t"				\
+		"mov.l	@r15+, r13\n\t"				\
+		"mov.l	@r15+, r12\n\t"				\
+		"mov.l	@r15+, r11\n\t"				\
+		"mov.l	@r15+, r10\n\t"				\
+		"mov.l	@r15+, r9\n\t"				\
+		"mov.l	@r15+, r8\n\t"				\
+		"lds.l	@r15+, pr\n\t"				\
+		"ldc.l	@r15+, gbr\n\t"				\
+		: "=z" (__last)					\
+		: "r" (__ts1), "r" (__ts2), "r" (__ts4),	\
+		  "r" (__ts5), "r" (__ts6), "r" (__ts7)		\
+		: "r3", "t");					\
+								\
+	last = __last;						\
+} while (0)
+
+/*
+ * Jump to P2 area.
+ * When handling TLB or caches, we need to do it from P2 area.
+ */
+#define jump_to_P2()			\
+do {					\
+	unsigned long __dummy;		\
+	__asm__ __volatile__(		\
+		"mov.l	1f, %0\n\t"	\
+		"or	%1, %0\n\t"	\
+		"jmp	@%0\n\t"	\
+		" nop\n\t"		\
+		".balign 4\n"		\
+		"1:	.long 2f\n"	\
+		"2:"			\
+		: "=&r" (__dummy)	\
+		: "r" (0x20000000));	\
+} while (0)
+
+/*
+ * Back to P1 area.
+ */
+#define back_to_P1()					\
+do {							\
+	unsigned long __dummy;				\
+	ctrl_barrier();					\
+	__asm__ __volatile__(				\
+		"mov.l	1f, %0\n\t"			\
+		"jmp	@%0\n\t"			\
+		" nop\n\t"				\
+		".balign 4\n"				\
+		"1:	.long 2f\n"			\
+		"2:"					\
+		: "=&r" (__dummy));			\
+} while (0)
+
+#endif /* __ASM_SH_SYSTEM_32_H */