patch-2.3.16 linux/include/asm-sh/system.h

• Lines: 186
• Date: Mon Aug 30 18:12:59 1999
• Orig file: v2.3.15/linux/include/asm-sh/system.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/asm-sh/system.h linux/include/asm-sh/system.h
@@ -0,0 +1,185 @@
+#ifndef __ASM_SH_SYSTEM_H
+#define __ASM_SH_SYSTEM_H
+
+/*
+ * Copyright (C) 1999  Niibe Yutaka
+ */
+
+/*
+ *	switch_to() should switch tasks to task nr n, first
+ */
+
+typedef struct {
+	unsigned long seg;
+} mm_segment_t;
+
+#ifdef __SMP__
+#error no SMP SuperH
+#else
+#define prepare_to_switch()	do { } while(0)
+#define switch_to(prev,next,last) do { \
+ register struct task_struct *__last; \
+ register unsigned long *__ts1 __asm__ ("r1") = &prev->thread.sp; \
+ register unsigned long *__ts2 __asm__ ("r2") = &prev->thread.pc; \
+ register unsigned long *__ts4 __asm__ ("r4") = (unsigned long *)prev; \
+ register unsigned long *__ts5 __asm__ ("r5") = (unsigned long *)next; \
+ register unsigned long *__ts6 __asm__ ("r6") = &next->thread.sp; \
+ register unsigned long __ts7 __asm__ ("r7") = next->thread.pc; \
+ __asm__ __volatile__ (".balign 4\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		! save SP\n\t" \
+		       "mov.l	@r6,r15		! change to new stack\n\t" \
+		       "mov.l	%0,@-r15	! push R0 onto new stack\n\t" \
+		       "mova	1f,%0\n\t" \
+		       "mov.l	%0,@r2		! save PC\n\t" \
+		       "mov.l	2f,%0\n\t" \
+		       "jmp	@%0		! call __switch_to\n\t" \
+		       " lds	r7,pr		!  with return to new PC\n" \
+		       "2:\n" \
+		       ".long	" "_" "__switch_to\n\t" \
+		       ".balign	4\n"	\
+		       "1:\n" \
+		       "mov.l	@r15+,%0	! pop R0 from new stack\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" \
+		       :"=&z" (__last) \
+		       :"0" (prev), \
+			"r" (__ts1), "r" (__ts2), \
+			"r" (__ts4), "r" (__ts5), "r" (__ts6), "r" (__ts7) \
+		       :"r3"); \
+  last = __last; \
+} while (0)
+#endif
+
+#define nop() __asm__ __volatile__ ("nop")
+
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+static __inline__ unsigned long tas(volatile int *m)
+{ /* #define tas(ptr) (xchg((ptr),1)) */
+	unsigned long retval;
+
+	__asm__ __volatile__ ("tas.b	@%1\n\t"
+			      "movt	%0"
+			      : "=r" (retval): "r" (m): "t", "memory");
+	return retval;
+}
+
+extern void __xchg_called_with_bad_pointer(void);
+
+#define mb()	__asm__ __volatile__ ("": : :"memory")
+#define rmb()	mb()
+#define wmb()	__asm__ __volatile__ ("": : :"memory")
+
+/* Interrupt Control */
+extern __inline__ void __sti(void)
+{
+	unsigned long __dummy;
+
+	__asm__ __volatile__("stc	sr,%0\n\t"
+			     "and	%1,%0\n\t"
+			     "ldc	%0,sr"
+			     : "=&z" (__dummy)
+			     : "r" (0xefffffff)
+			     : "memory");
+}
+
+extern __inline__ void __cli(void)
+{
+	unsigned long __dummy;
+	__asm__ __volatile__("stc	sr,%0\n\t"
+			     "or	%1,%0\n\t"
+			     "ldc	%0,sr"
+			     : "=&z" (__dummy)
+			     : "r" (0x10000000)
+			     : "memory");
+}
+
+#define __save_flags(x) \
+__asm__ __volatile__("stc	sr,%0\n\tnop\n\tnop\n\tnop\n\tnop\n\tnop":"=r" (x): /* no inputs */ :"memory")
+
+#define __save_and_cli(x)               \
+({	unsigned long __dummy;		\
+__asm__ __volatile__(                   \
+	"stc	sr,%0\n\t" \
+	"mov	%0,%1\n\t" \
+	"or	%2,%1\n\t" \
+	"ldc	%1,sr"     \
+	: "=&r" (x), "=&z" (__dummy) \
+	: "r" (0x10000000) \
+	: "memory"); })
+
+#define __restore_flags(x) \
+__asm__ __volatile__("ldc	%0,sr": /* no output */: "r" (x):"memory")
+
+/* For spinlocks etc */
+#define local_irq_save(x)	__save_and_cli(x)
+#define local_irq_restore(x)	__restore_flags(x)
+#define local_irq_disable()	__cli()
+#define local_irq_enable()	__sti()
+
+#ifdef __SMP__
+
+extern void __global_cli(void);
+extern void __global_sti(void);
+extern unsigned long __global_save_flags(void);
+extern void __global_restore_flags(unsigned long);
+#define cli() __global_cli()
+#define sti() __global_sti()
+#define save_flags(x) ((x)=__global_save_flags())
+#define restore_flags(x) __global_restore_flags(x)
+
+#else
+
+#define cli() __cli()
+#define sti() __sti()
+#define save_flags(x) __save_flags(x)
+#define save_and_cli(x) __save_and_cli(x)
+#define restore_flags(x) __restore_flags(x)
+
+#endif
+
+extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
+{
+	unsigned long flags, retval;
+
+	save_and_cli(flags);
+	retval = *m;
+	*m = val;
+	restore_flags(flags);
+	return retval;
+}
+
+static __inline__ unsigned long __xchg(unsigned long x, void * ptr, int size)
+{
+	switch (size) {
+	case 4:
+		return xchg_u32(ptr, x);
+		break;
+	}
+	__xchg_called_with_bad_pointer();
+	return x;
+}
+
+/* XXX
+ * disable hlt during certain critical i/o operations
+ */
+#define HAVE_DISABLE_HLT
+void disable_hlt(void);
+void enable_hlt(void);
+
+#endif