1 files changed, 350 insertions, 0 deletions

diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h
new file mode 100644
index 000000000000..fd12ca386f48
--- /dev/null
+++ b/include/asm-sparc64/system.h
@@ -0,0 +1,350 @@
+/* $Id: system.h,v 1.69 2002/02/09 19:49:31 davem Exp $ */
+#ifndef __SPARC64_SYSTEM_H
+#define __SPARC64_SYSTEM_H
+
+#include <linux/config.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/visasm.h>
+
+#ifndef __ASSEMBLY__
+/*
+ * Sparc (general) CPU types
+ */
+enum sparc_cpu {
+  sun4        = 0x00,
+  sun4c       = 0x01,
+  sun4m       = 0x02,
+  sun4d       = 0x03,
+  sun4e       = 0x04,
+  sun4u       = 0x05, /* V8 ploos ploos */
+  sun_unknown = 0x06,
+  ap1000      = 0x07, /* almost a sun4m */
+};
+                  
+#define sparc_cpu_model sun4u
+
+/* This cannot ever be a sun4c nor sun4 :) That's just history. */
+#define ARCH_SUN4C_SUN4 0
+#define ARCH_SUN4 0
+
+#endif
+
+#define setipl(__new_ipl) \
+        __asm__ __volatile__("wrpr      %0, %%pil"  : : "r" (__new_ipl) : "memory")
+
+#define local_irq_disable() \
+        __asm__ __volatile__("wrpr      15, %%pil" : : : "memory")
+
+#define local_irq_enable() \
+        __asm__ __volatile__("wrpr      0, %%pil" : : : "memory")
+
+#define getipl() \
+({ unsigned long retval; __asm__ __volatile__("rdpr     %%pil, %0" : "=r" (retval)); retval; })
+
+#define swap_pil(__new_pil) \
+({      unsigned long retval; \
+        __asm__ __volatile__("rdpr      %%pil, %0\n\t" \
+                             "wrpr      %1, %%pil" \
+                             : "=&r" (retval) \
+                             : "r" (__new_pil) \
+                             : "memory"); \
+        retval; \
+})
+
+#define read_pil_and_cli() \
+({      unsigned long retval; \
+        __asm__ __volatile__("rdpr      %%pil, %0\n\t" \
+                             "wrpr      15, %%pil" \
+                             : "=r" (retval) \
+                             : : "memory"); \
+        retval; \
+})
+
+#define local_save_flags(flags)         ((flags) = getipl())
+#define local_irq_save(flags)           ((flags) = read_pil_and_cli())
+#define local_irq_restore(flags)                setipl((flags))
+
+/* On sparc64 IRQ flags are the PIL register.  A value of zero
+ * means all interrupt levels are enabled, any other value means
+ * only IRQ levels greater than that value will be received.
+ * Consequently this means that the lowest IRQ level is one.
+ */
+#define irqs_disabled()         \
+({      unsigned long flags;    \
+        local_save_flags(flags);\
+        (flags > 0);            \
+})
+
+#define nop()           __asm__ __volatile__ ("nop")
+
+#define membar(type)    __asm__ __volatile__ ("membar " type : : : "memory")
+#define mb()            \
+        membar("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
+#define rmb()           membar("#LoadLoad")
+#define wmb()           membar("#StoreStore")
+#define read_barrier_depends()          do { } while(0)
+#define set_mb(__var, __value) \
+        do { __var = __value; membar("#StoreLoad | #StoreStore"); } while(0)
+#define set_wmb(__var, __value) \
+        do { __var = __value; membar("#StoreStore"); } while(0)
+
+#ifdef CONFIG_SMP
+#define smp_mb()        mb()
+#define smp_rmb()       rmb()
+#define smp_wmb()       wmb()
+#define smp_read_barrier_depends()      read_barrier_depends()
+#else
+#define smp_mb()        __asm__ __volatile__("":::"memory")
+#define smp_rmb()       __asm__ __volatile__("":::"memory")
+#define smp_wmb()       __asm__ __volatile__("":::"memory")
+#define smp_read_barrier_depends()      do { } while(0)
+#endif
+
+#define flushi(addr)    __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory")
+
+#define flushw_all()    __asm__ __volatile__("flushw")
+
+/* Performance counter register access. */
+#define read_pcr(__p)  __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p))
+#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p))
+#define read_pic(__p)  __asm__ __volatile__("rd %%pic, %0" : "=r" (__p))
+
+/* Blackbird errata workaround.  See commentary in
+ * arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
+ * for more information.
+ */
+#define reset_pic()                                             \
+        __asm__ __volatile__("ba,pt     %xcc, 99f\n\t"          \
+                             ".align    64\n"                   \
+                          "99:wr        %g0, 0x0, %pic\n\t"     \
+                             "rd        %pic, %g0")
+
+#ifndef __ASSEMBLY__
+
+extern void sun_do_break(void);
+extern int serial_console;
+extern int stop_a_enabled;
+
+static __inline__ int con_is_present(void)
+{
+        return serial_console ? 0 : 1;
+}
+
+extern void synchronize_user_stack(void);
+
+extern void __flushw_user(void);
+#define flushw_user() __flushw_user()
+
+#define flush_user_windows flushw_user
+#define flush_register_windows flushw_all
+
+#define prepare_arch_switch(rq, next)           \
+do {    spin_lock(&(next)->switch_lock);        \
+        spin_unlock(&(rq)->lock);               \
+        flushw_all();                           \
+} while (0)
+
+#define finish_arch_switch(rq, prev)            \
+do {    spin_unlock_irq(&(prev)->switch_lock);  \
+} while (0)
+
+#define task_running(rq, p) \
+        ((rq)->curr == (p) || spin_is_locked(&(p)->switch_lock))
+
+        /* See what happens when you design the chip correctly?
+         *
+         * We tell gcc we clobber all non-fixed-usage registers except
+         * for l0/l1.  It will use one for 'next' and the other to hold
+         * the output value of 'last'.  'next' is not referenced again
+         * past the invocation of switch_to in the scheduler, so we need
+         * not preserve it's value.  Hairy, but it lets us remove 2 loads
+         * and 2 stores in this critical code path.  -DaveM
+         */
+#if __GNUC__ >= 3
+#define EXTRA_CLOBBER ,"%l1"
+#else
+#define EXTRA_CLOBBER
+#endif
+#define switch_to(prev, next, last)                                     \
+do {    if (test_thread_flag(TIF_PERFCTR)) {                            \
+                unsigned long __tmp;                                    \
+                read_pcr(__tmp);                                        \
+                current_thread_info()->pcr_reg = __tmp;                 \
+                read_pic(__tmp);                                        \
+                current_thread_info()->kernel_cntd0 += (unsigned int)(__tmp);\
+                current_thread_info()->kernel_cntd1 += ((__tmp) >> 32); \
+        }                                                               \
+        flush_tlb_pending();                                            \
+        save_and_clear_fpu();                                           \
+        /* If you are tempted to conditionalize the following */        \
+        /* so that ASI is only written if it changes, think again. */   \
+        __asm__ __volatile__("wr %%g0, %0, %%asi"                       \
+        : : "r" (__thread_flag_byte_ptr(next->thread_info)[TI_FLAG_BYTE_CURRENT_DS]));\
+        __asm__ __volatile__(                                           \
+        "mov    %%g4, %%g7\n\t"                                         \
+        "wrpr   %%g0, 0x95, %%pstate\n\t"                               \
+        "stx    %%i6, [%%sp + 2047 + 0x70]\n\t"                         \
+        "stx    %%i7, [%%sp + 2047 + 0x78]\n\t"                         \
+        "rdpr   %%wstate, %%o5\n\t"                                     \
+        "stx    %%o6, [%%g6 + %3]\n\t"                                  \
+        "stb    %%o5, [%%g6 + %2]\n\t"                                  \
+        "rdpr   %%cwp, %%o5\n\t"                                        \
+        "stb    %%o5, [%%g6 + %5]\n\t"                                  \
+        "mov    %1, %%g6\n\t"                                           \
+        "ldub   [%1 + %5], %%g1\n\t"                                    \
+        "wrpr   %%g1, %%cwp\n\t"                                        \
+        "ldx    [%%g6 + %3], %%o6\n\t"                                  \
+        "ldub   [%%g6 + %2], %%o5\n\t"                                  \
+        "ldx    [%%g6 + %4], %%o7\n\t"                                  \
+        "mov    %%g6, %%l2\n\t"                                         \
+        "wrpr   %%o5, 0x0, %%wstate\n\t"                                \
+        "ldx    [%%sp + 2047 + 0x70], %%i6\n\t"                         \
+        "ldx    [%%sp + 2047 + 0x78], %%i7\n\t"                         \
+        "wrpr   %%g0, 0x94, %%pstate\n\t"                               \
+        "mov    %%l2, %%g6\n\t"                                         \
+        "ldx    [%%g6 + %7], %%g4\n\t"                                  \
+        "wrpr   %%g0, 0x96, %%pstate\n\t"                               \
+        "andcc  %%o7, %6, %%g0\n\t"                                     \
+        "beq,pt %%icc, 1f\n\t"                                          \
+        " mov   %%g7, %0\n\t"                                           \
+        "b,a ret_from_syscall\n\t"                                      \
+        "1:\n\t"                                                        \
+        : "=&r" (last)                                                  \
+        : "0" (next->thread_info),                                      \
+          "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_FLAGS), "i" (TI_CWP),  \
+          "i" (_TIF_NEWCHILD), "i" (TI_TASK)                            \
+        : "cc",                                                         \
+                "g1", "g2", "g3",                   "g7",               \
+                      "l2", "l3", "l4", "l5", "l6", "l7",               \
+          "i0", "i1", "i2", "i3", "i4", "i5",                           \
+          "o0", "o1", "o2", "o3", "o4", "o5",       "o7" EXTRA_CLOBBER);\
+        /* If you fuck with this, update ret_from_syscall code too. */  \
+        if (test_thread_flag(TIF_PERFCTR)) {                            \
+                write_pcr(current_thread_info()->pcr_reg);              \
+                reset_pic();                                            \
+        }                                                               \
+} while(0)
+
+static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val)
+{
+        unsigned long tmp1, tmp2;
+
+        __asm__ __volatile__(
+"       membar          #StoreLoad | #LoadLoad\n"
+"       mov             %0, %1\n"
+"1:     lduw            [%4], %2\n"
+"       cas             [%4], %2, %0\n"
+"       cmp             %2, %0\n"
+"       bne,a,pn        %%icc, 1b\n"
+"        mov            %1, %0\n"
+"       membar          #StoreLoad | #StoreStore\n"
+        : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
+        : "0" (val), "r" (m)
+        : "cc", "memory");
+        return val;
+}
+
+static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long val)
+{
+        unsigned long tmp1, tmp2;
+
+        __asm__ __volatile__(
+"       membar          #StoreLoad | #LoadLoad\n"
+"       mov             %0, %1\n"
+"1:     ldx             [%4], %2\n"
+"       casx            [%4], %2, %0\n"
+"       cmp             %2, %0\n"
+"       bne,a,pn        %%xcc, 1b\n"
+"        mov            %1, %0\n"
+"       membar          #StoreLoad | #StoreStore\n"
+        : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
+        : "0" (val), "r" (m)
+        : "cc", "memory");
+        return val;
+}
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+#define tas(ptr) (xchg((ptr),1))
+
+extern void __xchg_called_with_bad_pointer(void);
+
+static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr,
+                                       int size)
+{
+        switch (size) {
+        case 4:
+                return xchg32(ptr, x);
+        case 8:
+                return xchg64(ptr, x);
+        };
+        __xchg_called_with_bad_pointer();
+        return x;
+}
+
+extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
+
+/* 
+ * Atomic compare and exchange.  Compare OLD with MEM, if identical,
+ * store NEW in MEM.  Return the initial value in MEM.  Success is
+ * indicated by comparing RETURN with OLD.
+ */
+
+#define __HAVE_ARCH_CMPXCHG 1
+
+static __inline__ unsigned long
+__cmpxchg_u32(volatile int *m, int old, int new)
+{
+        __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
+                             "cas [%2], %3, %0\n\t"
+                             "membar #StoreLoad | #StoreStore"
+                             : "=&r" (new)
+                             : "0" (new), "r" (m), "r" (old)
+                             : "memory");
+
+        return new;
+}
+
+static __inline__ unsigned long
+__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
+{
+        __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
+                             "casx [%2], %3, %0\n\t"
+                             "membar #StoreLoad | #StoreStore"
+                             : "=&r" (new)
+                             : "0" (new), "r" (m), "r" (old)
+                             : "memory");
+
+        return new;
+}
+
+/* This function doesn't exist, so you'll get a linker error
+   if something tries to do an invalid cmpxchg().  */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
+static __inline__ unsigned long
+__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
+{
+        switch (size) {
+                case 4:
+                        return __cmpxchg_u32(ptr, old, new);
+                case 8:
+                        return __cmpxchg_u64(ptr, old, new);
+        }
+        __cmpxchg_called_with_bad_pointer();
+        return old;
+}
+
+#define cmpxchg(ptr,o,n)                                                 \
+  ({                                                                     \
+     __typeof__(*(ptr)) _o_ = (o);                                       \
+     __typeof__(*(ptr)) _n_ = (n);                                       \
+     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
+                                    (unsigned long)_n_, sizeof(*(ptr))); \
+  })
+
+#endif /* !(__ASSEMBLY__) */
+
+#define arch_align_stack(x) (x)
+
+#endif /* !(__SPARC64_SYSTEM_H) */