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processor.h

#ifndef _ASM_CRIS_ARCH_PROCESSOR_H
#define _ASM_CRIS_ARCH_PROCESSOR_H


/* Return current instruction pointer. */
#define current_text_addr() \
      ({void *pc; __asm__ __volatile__ ("lapcq .,%0" : "=rm" (pc)); pc;})

/*
 * Since CRIS doesn't do hardware task-switching this hasn't really anything to
 * do with the proccessor itself, it's just here for legacy reasons. This is
 * used when task-switching using _resume defined in entry.S. The offsets here
 * are hardcoded into _resume, so if this struct is changed, entry.S needs to be
 * changed as well.
 */
struct thread_struct {
      unsigned long ksp;      /* Kernel stack pointer. */
      unsigned long usp;      /* User stack pointer. */
      unsigned long ccs;      /* Saved flags register. */
};

/*
 * User-space process size. This is hardcoded into a few places, so don't
 * changed it unless everything's clear!
 */
#ifndef CONFIG_ETRAX_VCS_SIM
#define TASK_SIZE (0xB0000000UL)
#else
#define TASK_SIZE (0xA0000000UL)
#endif

/* CCS I=1, enable interrupts. */
#define INIT_THREAD { 0, 0, (1 << I_CCS_BITNR) }

#define KSTK_EIP(tsk)         \
({                      \
      unsigned long eip = 0;  \
      unsigned long regs = (unsigned long)task_pt_regs(tsk); \
      if (regs > PAGE_SIZE && virt_addr_valid(regs))      \
            eip = ((struct pt_regs *)regs)->erp;          \
      eip; \
})

/*
 * Give the thread a program location, set user-mode and switch user
 * stackpointer.
 */
#define start_thread(regs, ip, usp) \
do { \
      set_fs(USER_DS); \
      regs->erp = ip; \
      regs->ccs |= 1 << (U_CCS_BITNR + CCS_SHIFT); \
      wrusp(usp); \
} while(0)

/* Nothing special to do for v32 when handling a kernel bus fault fixup. */
#define arch_fixup(regs) {};

#endif /* _ASM_CRIS_ARCH_PROCESSOR_H */

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