LXR linux/arch/cris/include/arch-v10/arch/processor.h

   1#ifndef __ASM_CRIS_ARCH_PROCESSOR_H
   2#define __ASM_CRIS_ARCH_PROCESSOR_H
   3
   4/*
   5 * Default implementation of macro that returns current
   6 * instruction pointer ("program counter").
   7 */
   8#define current_text_addr() ({void *pc; __asm__ ("move.d $pc,%0" : "=rm" (pc)); pc; })
   9
  10/* CRIS has no problems with write protection */
  11#define wp_works_ok 1
  12
  13/* CRIS thread_struct. this really has nothing to do with the processor itself, since
  14 * CRIS does not do any hardware task-switching, but it's here for legacy reasons.
  15 * The thread_struct here is used when task-switching using _resume defined in entry.S.
  16 * The offsets here are hardcoded into _resume - if you change this struct, you need to
  17 * change them as well!!!
  18*/
  19
  20struct thread_struct {
  21        unsigned long ksp;     /* kernel stack pointer */
  22        unsigned long usp;     /* user stack pointer */
  23        unsigned long dccr;    /* saved flag register */
  24};
  25
  26/*
  27 * User space process size. This is hardcoded into a few places,
  28 * so don't change it unless you know what you are doing.
  29 */
  30
  31#ifdef CONFIG_CRIS_LOW_MAP
  32#define TASK_SIZE       (0x50000000UL)   /* 1.25 GB */
  33#else
  34#define TASK_SIZE       (0xA0000000UL)   /* 2.56 GB */
  35#endif
  36
  37#define INIT_THREAD  { \
  38   0, 0, 0x20 }  /* ccr = int enable, nothing else */
  39
  40#define KSTK_EIP(tsk)   \
  41({                      \
  42        unsigned long eip = 0;   \
  43        unsigned long regs = (unsigned long)task_pt_regs(tsk); \
  44        if (regs > PAGE_SIZE && \
  45                virt_addr_valid(regs)) \
  46        eip = ((struct pt_regs *)regs)->irp; \
  47        eip; \
  48})
  49
  50/* give the thread a program location
  51 * set user-mode (The 'U' flag (User mode flag) is CCR/DCCR bit 8) 
  52 * switch user-stackpointer
  53 */
  54
  55#define start_thread(regs, ip, usp) do { \
  56        regs->irp = ip;       \
  57        regs->dccr |= 1 << U_DCCR_BITNR; \
  58        wrusp(usp);           \
  59} while(0)
  60
  61/* Called when handling a kernel bus fault fixup.
  62 *
  63 * After a fixup we do not want to return by restoring the CPU-state
  64 * anymore, so switch frame-types (see ptrace.h)
  65 */
  66#define arch_fixup(regs) \
  67   regs->frametype = CRIS_FRAME_NORMAL;
  68
  69#endif
  70