patch-2.4.0-test12 linux/include/asm-parisc/system.h

• Lines: 149
• Date: Wed Dec 6 11:46:39 2000
• Orig file: v2.4.0-test11/linux/include/asm-parisc/system.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/include/asm-parisc/system.h linux/include/asm-parisc/system.h
@@ -0,0 +1,148 @@
+#ifndef __PARISC_SYSTEM_H
+#define __PARISC_SYSTEM_H
+
+#include <linux/config.h>
+#include <asm/psw.h>
+
+/* The program status word as bitfields.  */
+struct pa_psw {
+	unsigned int y:1;
+	unsigned int z:1;
+	unsigned int rv:2;
+	unsigned int w:1;
+	unsigned int e:1;
+	unsigned int s:1;
+	unsigned int t:1;
+
+	unsigned int h:1;
+	unsigned int l:1;
+	unsigned int n:1;
+	unsigned int x:1;
+	unsigned int b:1;
+	unsigned int c:1;
+	unsigned int v:1;
+	unsigned int m:1;
+
+	unsigned int cb:8;
+
+	unsigned int o:1;
+	unsigned int g:1;
+	unsigned int f:1;
+	unsigned int r:1;
+	unsigned int q:1;
+	unsigned int p:1;
+	unsigned int d:1;
+	unsigned int i:1;
+};
+
+#define pa_psw(task) ((struct pa_psw *) ((char *) (task) + TASK_PT_PSW))
+
+struct task_struct;
+
+extern struct task_struct *_switch_to(struct task_struct *, struct task_struct *);
+
+#define prepare_to_switch()	do { } while(0)
+#define switch_to(prev, next, last) do {			\
+	(last) = _switch_to(prev, next);			\
+} while(0)
+
+/* borrowed this from sparc64 -- probably the SMP case is hosed for us */
+#ifdef CONFIG_SMP
+#define smp_mb()	mb()
+#define smp_rmb()	rmb()
+#define smp_wmb()	wmb()
+#else
+/* This is simply the barrier() macro from linux/kernel.h but when serial.c
+ * uses tqueue.h uses smp_mb() defined using barrier(), linux/kernel.h
+ * hasn't yet been included yet so it fails, thus repeating the macro here.
+ */
+#define smp_mb()	__asm__ __volatile__("":::"memory");
+#define smp_rmb()	__asm__ __volatile__("":::"memory");
+#define smp_wmb()	__asm__ __volatile__("":::"memory");
+#endif
+
+/* interrupt control */
+#define __save_flags(x)	__asm__ __volatile__("ssm 0, %0" : "=r" (x) : : "memory")
+#define __restore_flags(x) __asm__ __volatile__("mtsm %0" : : "r" (x) : "memory")
+#define __cli()	__asm__ __volatile__("rsm %0,%%r0\n" : : "i" (PSW_I) : "memory" )
+#define __sti()	__asm__ __volatile__("ssm %0,%%r0\n" : : "i" (PSW_I) : "memory" )
+
+#define local_irq_save(x) \
+	__asm__ __volatile__("rsm %1,%0" : "=r" (x) :"i" (PSW_I) : "memory" )
+#define local_irq_restore(x) \
+	__asm__ __volatile__("mtsm %0" : : "r" (x) : "memory" )
+#define local_irq_disable() __cli()
+#define local_irq_enable()  __sti()
+
+#ifdef CONFIG_SMP
+#else
+#define cli() __cli()
+#define sti() __sti()
+#define save_flags(x) __save_flags(x)
+#define restore_flags(x) __restore_flags(x)
+#endif
+
+
+#define mfctl(reg)	({		\
+	unsigned long cr;		\
+	__asm__ __volatile__(		\
+		"mfctl " #reg ",%0" :	\
+		 "=r" (cr)		\
+	);				\
+	cr;				\
+})
+
+#define mtctl(gr, cr) \
+	__asm__ __volatile__("mtctl %0,%1" \
+		: /* no outputs */ \
+		: "r" (gr), "i" (cr))
+
+/* these are here to de-mystefy the calling code, and to provide hooks */
+/* which I needed for debugging EIEM problems -PB */
+#define get_eiem() mfctl(15)
+static inline void set_eiem(unsigned long val)
+{
+	mtctl(val, 15);
+}
+
+#define mfsp(reg)	({		\
+	unsigned long cr;		\
+	__asm__ __volatile__(		\
+		"mfsp " #reg ",%0" :	\
+		 "=r" (cr)		\
+	);				\
+	cr;				\
+})
+
+#define mtsp(gr, cr) \
+	__asm__ __volatile__("mtsp %0,%1" \
+		: /* no outputs */ \
+		: "r" (gr), "i" (cr))
+
+
+#define mb()  __asm__ __volatile__ ("sync" : : :"memory")
+#define wmb() mb()
+
+extern unsigned long __xchg(unsigned long, unsigned long *, int);
+
+#define xchg(ptr,x) \
+ (__typeof__(*(ptr)))__xchg((unsigned long)(x),(unsigned long*)(ptr),sizeof(*(ptr)))
+
+/* LDCW, the only atomic read-write operation PA-RISC has.  Sigh. */
+#define __ldcw(a) ({ \
+	unsigned __ret; \
+	__asm__ __volatile__("ldcw 0(%1),%0" : "=r" (__ret) : "r" (a)); \
+	__ret; \
+})
+
+#ifdef CONFIG_SMP
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+typedef struct {
+	volatile unsigned int __attribute__((aligned(16))) lock;
+} spinlock_t;
+#endif
+
+#endif