1 files changed, 210 insertions, 0 deletions

diff --git a/include/asm-parisc/system.h b/include/asm-parisc/system.h
new file mode 100644
index 000000000000..81c543339036
--- /dev/null
+++ b/include/asm-parisc/system.h
@@ -0,0 +1,210 @@
+#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;
+};
+
+#ifdef __LP64__
+#define pa_psw(task) ((struct pa_psw *) ((char *) (task) + TASK_PT_PSW + 4))
+#else
+#define pa_psw(task) ((struct pa_psw *) ((char *) (task) + TASK_PT_PSW))
+#endif
+
+struct task_struct;
+
+extern struct task_struct *_switch_to(struct task_struct *, struct task_struct *);
+
+#define switch_to(prev, next, last) do {                        \
+        (last) = _switch_to(prev, next);                        \
+} while(0)
+
+
+
+/* interrupt control */
+#define local_save_flags(x)     __asm__ __volatile__("ssm 0, %0" : "=r" (x) : : "memory")
+#define local_irq_disable()     __asm__ __volatile__("rsm %0,%%r0\n" : : "i" (PSW_I) : "memory" )
+#define local_irq_enable()      __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 irqs_disabled()                 \
+({                                      \
+        unsigned long flags;            \
+        local_save_flags(flags);        \
+        (flags & PSW_I) == 0;           \
+})
+
+#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) : "memory")
+
+/* 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) : "memory")
+
+
+/*
+** 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.
+**
+** PA-RISC architecture allows for weakly ordered memory accesses although
+** none of the processors use it. There is a strong ordered bit that is
+** set in the O-bit of the page directory entry. Operating systems that
+** can not tolerate out of order accesses should set this bit when mapping
+** pages. The O-bit of the PSW should also be set to 1 (I don't believe any
+** of the processor implemented the PSW O-bit). The PCX-W ERS states that
+** the TLB O-bit is not implemented so the page directory does not need to
+** have the O-bit set when mapping pages (section 3.1). This section also
+** states that the PSW Y, Z, G, and O bits are not implemented.
+** So it looks like nothing needs to be done for parisc-linux (yet).
+** (thanks to chada for the above comment -ggg)
+**
+** The __asm__ op below simple prevents gcc/ld from reordering
+** instructions across the mb() "call".
+*/
+#define mb()            __asm__ __volatile__("":::"memory")     /* barrier() */
+#define rmb()           mb()
+#define wmb()           mb()
+#define smp_mb()        mb()
+#define smp_rmb()       mb()
+#define smp_wmb()       mb()
+#define smp_read_barrier_depends()      do { } while(0)
+#define read_barrier_depends()          do { } while(0)
+
+#define set_mb(var, value)              do { var = value; mb(); } while (0)
+#define set_wmb(var, value)             do { var = value; wmb(); } while (0)
+
+
+/* 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; \
+})
+
+/* Because kmalloc only guarantees 8-byte alignment for kmalloc'd data,
+   and GCC only guarantees 8-byte alignment for stack locals, we can't
+   be assured of 16-byte alignment for atomic lock data even if we
+   specify "__attribute ((aligned(16)))" in the type declaration.  So,
+   we use a struct containing an array of four ints for the atomic lock
+   type and dynamically select the 16-byte aligned int from the array
+   for the semaphore.  */
+#define __PA_LDCW_ALIGNMENT 16
+#define __ldcw_align(a) ({ \
+  unsigned long __ret = (unsigned long) &(a)->lock[0];                  \
+  __ret = (__ret + __PA_LDCW_ALIGNMENT - 1) & ~(__PA_LDCW_ALIGNMENT - 1); \
+  (volatile unsigned int *) __ret;                                      \
+})
+
+#ifdef CONFIG_SMP
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+typedef struct {
+        volatile unsigned int lock[4];
+#ifdef CONFIG_DEBUG_SPINLOCK
+        unsigned long magic;
+        volatile unsigned int babble;
+        const char *module;
+        char *bfile;
+        int bline;
+        int oncpu;
+        void *previous;
+        struct task_struct * task;
+#endif
+#ifdef CONFIG_PREEMPT
+        unsigned int break_lock;
+#endif
+} spinlock_t;
+
+#define __lock_aligned __attribute__((__section__(".data.lock_aligned")))
+
+#endif
+
+#define KERNEL_START (0x10100000 - 0x1000)
+
+/* This is for the serialisation of PxTLB broadcasts.  At least on the
+ * N class systems, only one PxTLB inter processor broadcast can be
+ * active at any one time on the Merced bus.  This tlb purge
+ * synchronisation is fairly lightweight and harmless so we activate
+ * it on all SMP systems not just the N class. */
+#ifdef CONFIG_SMP
+extern spinlock_t pa_tlb_lock;
+
+#define purge_tlb_start(x) spin_lock(&pa_tlb_lock)
+#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock)
+
+#else
+
+#define purge_tlb_start(x) do { } while(0)
+#define purge_tlb_end(x) do { } while (0)
+
+#endif
+
+#define arch_align_stack(x) (x)
+
+#endif