arch/powerpc/boot/reg.h

   1 #ifndef _PPC_BOOT_REG_H
   2 #define _PPC_BOOT_REG_H
   3 /*
   4  * Copyright 2007 Davud Gibson, IBM Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 static inline u32 mfpvr(void)
  13 {
  14         u32 pvr;
  15         asm volatile ("mfpvr    %0" : "=r"(pvr));
  16         return pvr;
  17 }
  18
  19 #define __stringify_1(x)        #x
  20 #define __stringify(x)          __stringify_1(x)
  21
  22 #define mfspr(rn)       ({unsigned long rval; \
  23                         asm volatile("mfspr %0," __stringify(rn) \
  24                                 : "=r" (rval)); rval; })
  25 #define mtspr(rn, v)    asm volatile("mtspr " __stringify(rn) ",%0" : : "r" (v))
  26
  27 register void *__stack_pointer asm("r1");
  28 #define get_sp()        (__stack_pointer)
  29
  30 #endif  /* _PPC_BOOT_REG_H */