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

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