linux/arch/cris/include/arch-v32/arch/processor.h
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   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 */
  16struct 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_ETRAX_VCS_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) \
  49do { \
  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 */
  60
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