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system_64.h

#ifndef __SPARC64_SYSTEM_H
#define __SPARC64_SYSTEM_H

#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/visasm.h>

#ifndef __ASSEMBLY__

#include <linux/irqflags.h>
#include <asm-generic/cmpxchg-local.h>

/*
 * 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

extern char reboot_command[];

/* These are here in an effort to more fully work around Spitfire Errata
 * #51.  Essentially, if a memory barrier occurs soon after a mispredicted
 * branch, the chip can stop executing instructions until a trap occurs.
 * Therefore, if interrupts are disabled, the chip can hang forever.
 *
 * It used to be believed that the memory barrier had to be right in the
 * delay slot, but a case has been traced recently wherein the memory barrier
 * was one instruction after the branch delay slot and the chip still hung.
 * The offending sequence was the following in sym_wakeup_done() of the
 * sym53c8xx_2 driver:
 *
 *    call  sym_ccb_from_dsa, 0
 *     movge      %icc, 0, %l0
 *    brz,pn      %o0, .LL1303
 *     mov  %o0, %l2
 *    membar      #LoadLoad
 *
 * The branch has to be mispredicted for the bug to occur.  Therefore, we put
 * the memory barrier explicitly into a "branch always, predicted taken"
 * delay slot to avoid the problem case.
 */
#define membar_safe(type) \
do {  __asm__ __volatile__("ba,pt   %%xcc, 1f\n\t" \
                       " membar     " type "\n" \
                       "1:\n" \
                       : : : "memory"); \
} while (0)

#define mb()      \
      membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
#define rmb()     \
      membar_safe("#LoadLoad")
#define wmb()     \
      membar_safe("#StoreStore")
#define membar_storeload() \
      membar_safe("#StoreLoad")
#define membar_storeload_storestore() \
      membar_safe("#StoreLoad | #StoreStore")
#define membar_storeload_loadload() \
      membar_safe("#StoreLoad | #LoadLoad")
#define membar_storestore_loadstore() \
      membar_safe("#StoreStore | #LoadStore")

#endif

#define nop()           __asm__ __volatile__ ("nop")

#define read_barrier_depends()            do { } while(0)
#define set_mb(__var, __value) \
      do { __var = __value; membar_storeload_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 stop_a_enabled;

extern void fault_in_user_windows(void);
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

/* Don't hold the runqueue lock over context switch */
#define __ARCH_WANT_UNLOCKED_CTXSW
#define prepare_arch_switch(next)         \
do {                                \
      flushw_all();                       \
} while (0)

      /* 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
       */
#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(task_thread_info(next))[TI_FLAG_BYTE_CURRENT_DS]));\
      trap_block[current_thread_info()->cpu].thread =             \
            task_thread_info(next);                         \
      __asm__ __volatile__(                                 \
      "mov  %%g4, %%g7\n\t"                                 \
      "stx  %%i6, [%%sp + 2047 + 0x70]\n\t"                       \
      "stx  %%i7, [%%sp + 2047 + 0x78]\n\t"                       \
      "rdpr %%wstate, %%o5\n\t"                             \
      "stx  %%o6, [%%g6 + %6]\n\t"                          \
      "stb  %%o5, [%%g6 + %5]\n\t"                          \
      "rdpr %%cwp, %%o5\n\t"                          \
      "stb  %%o5, [%%g6 + %8]\n\t"                          \
      "mov  %4, %%g6\n\t"                                   \
      "ldub [%4 + %8], %%g1\n\t"                            \
      "wrpr %%g1, %%cwp\n\t"                          \
      "ldx  [%%g6 + %6], %%o6\n\t"                          \
      "ldub [%%g6 + %5], %%o5\n\t"                          \
      "ldub [%%g6 + %7], %%o7\n\t"                          \
      "wrpr %%o5, 0x0, %%wstate\n\t"                        \
      "ldx  [%%sp + 2047 + 0x70], %%i6\n\t"                       \
      "ldx  [%%sp + 2047 + 0x78], %%i7\n\t"                       \
      "ldx  [%%g6 + %9], %%g4\n\t"                          \
      "brz,pt %%o7, switch_to_pc\n\t"                             \
      " mov %%g7, %0\n\t"                                   \
      "sethi      %%hi(ret_from_syscall), %%g1\n\t"               \
      "jmpl %%g1 + %%lo(ret_from_syscall), %%g0\n\t"        \
      " nop\n\t"                                      \
      ".globl switch_to_pc\n\t"                             \
      "switch_to_pc:\n\t"                                   \
      : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg),   \
        "=r" (__local_per_cpu_offset)                             \
      : "0" (task_thread_info(next)),                             \
        "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD),            \
        "i" (TI_CWP), "i" (TI_TASK)                         \
      : "cc",                                               \
              "g1", "g2", "g3",                   "g7",           \
              "l1", "l2", "l3", "l4", "l5", "l6", "l7",           \
        "i0", "i1", "i2", "i3", "i4", "i5",                       \
        "o0", "o1", "o2", "o3", "o4", "o5",       "o7");          \
      /* 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))))

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))); \
  })

/*
 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 * them available.
 */

static inline unsigned long __cmpxchg_local(volatile void *ptr,
                              unsigned long old,
                              unsigned long new, int size)
{
      switch (size) {
      case 4:
      case 8:     return __cmpxchg(ptr, old, new, size);
      default:
            return __cmpxchg_local_generic(ptr, old, new, size);
      }

      return old;
}

#define cmpxchg_local(ptr, o, n)                            \
      ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o),   \
                  (unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n)                          \
  ({                                                  \
      BUILD_BUG_ON(sizeof(*(ptr)) != 8);                    \
      cmpxchg_local((ptr), (o), (n));                             \
  })

#endif /* !(__ASSEMBLY__) */

#define arch_align_stack(x) (x)

#endif /* !(__SPARC64_SYSTEM_H) */

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