include/asm-cris/arch-v32/processor.h

   1 #ifndef _ASM_CRIS_ARCH_PROCESSOR_H
   2 #define _ASM_CRIS_ARCH_PROCESSOR_H
   3
   4
   5 /* Return current instruction pointer. */
   6 #define current_text_addr() \
   7         ({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;})
   8
   9 /*
  10  * Since CRIS doesn't do hardware task-switching this hasn't really anything to
  11  * do with the proccessor itself, it's just here for legacy reasons. This is
  12  * used when task-switching using _resume defined in entry.S. The offsets here
  13  * are hardcoded into _resume, so if this struct is changed, entry.S needs to be
  14  * changed as well.
  15  */
  16 struct thread_struct {
  17         unsigned long ksp;      /* Kernel stack pointer. */
  18         unsigned long usp;      /* User stack pointer. */
  19         unsigned long ccs;      /* Saved flags register. */
  20 };
  21
  22 /*
  23  * User-space process size. This is hardcoded into a few places, so don't
  24  * changed it unless everything's clear!
  25  */
  26 #ifndef CONFIG_ETRAXFS_SIM
  27 #define TASK_SIZE       (0xB0000000UL)
  28 #else
  29 #define TASK_SIZE       (0xA0000000UL)
  30 #endif
  31
  32 /* CCS I=1, enable interrupts. */
  33 #define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) }
  34
  35 #define KSTK_EIP(tsk)           \
  36 ({                              \
  37         unsigned long eip = 0;  \
  38         unsigned long regs = (unsigned long)task_pt_regs(tsk); \
  39         if (regs > PAGE_SIZE && virt_addr_valid(regs))      \
  40                 eip = ((struct pt_regs *)regs)->erp;        \
  41         eip; \
  42 })
  43
  44 /*
  45  * Give the thread a program location, set user-mode and switch user
  46  * stackpointer.
  47  */
  48 #define start_thread(regs, ip, usp) \
  49 do { \
  50         set_fs(USER_DS); \
  51         regs->erp = ip; \
  52         regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \
  53         wrusp(usp); \
  54 } while(0)
  55
  56 /* Nothing special to do for v32 when handling a kernel bus fault fixup. */
  57 #define arch_fixup(regs) {};
  58
  59 #endif /* _ASM_CRIS_ARCH_PROCESSOR_H */