LXR linux/arch/unicore32/include/asm/processor.h

   1/*
   2 * linux/arch/unicore32/include/asm/processor.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#ifndef __UNICORE_PROCESSOR_H__
  14#define __UNICORE_PROCESSOR_H__
  15
  16/*
  17 * Default implementation of macro that returns current
  18 * instruction pointer ("program counter").
  19 */
  20#define current_text_addr() ({ __label__ _l; _l: &&_l; })
  21
  22#ifdef __KERNEL__
  23
  24#include <asm/ptrace.h>
  25#include <asm/types.h>
  26
  27#ifdef __KERNEL__
  28#define STACK_TOP       TASK_SIZE
  29#define STACK_TOP_MAX   TASK_SIZE
  30#endif
  31
  32struct debug_entry {
  33        u32                     address;
  34        u32                     insn;
  35};
  36
  37struct debug_info {
  38        int                     nsaved;
  39        struct debug_entry      bp[2];
  40};
  41
  42struct thread_struct {
  43                                                        /* fault info     */
  44        unsigned long           address;
  45        unsigned long           trap_no;
  46        unsigned long           error_code;
  47                                                        /* debugging      */
  48        struct debug_info       debug;
  49};
  50
  51#define INIT_THREAD  {  }
  52
  53#define start_thread(regs, pc, sp)                                      \
  54({                                                                      \
  55        unsigned long *stack = (unsigned long *)sp;                     \
  56        memset(regs->uregs, 0, sizeof(regs->uregs));                    \
  57        regs->UCreg_asr = USER_MODE;                                    \
  58        regs->UCreg_pc = pc & ~1;       /* pc */                        \
  59        regs->UCreg_sp = sp;            /* sp */                        \
  60        regs->UCreg_02 = stack[2];      /* r2 (envp) */                 \
  61        regs->UCreg_01 = stack[1];      /* r1 (argv) */                 \
  62        regs->UCreg_00 = stack[0];      /* r0 (argc) */                 \
  63})
  64
  65/* Forward declaration, a strange C thing */
  66struct task_struct;
  67
  68/* Free all resources held by a thread. */
  69extern void release_thread(struct task_struct *);
  70
  71unsigned long get_wchan(struct task_struct *p);
  72
  73#define cpu_relax()                     barrier()
  74#define cpu_relax_lowlatency()                cpu_relax()
  75
  76#define task_pt_regs(p) \
  77        ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
  78
  79#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->UCreg_pc)
  80#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->UCreg_sp)
  81
  82#endif
  83
  84#endif /* __UNICORE_PROCESSOR_H__ */
  85