LXR linux/arch/um/include/asm/processor-generic.h

   1/* 
   2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#ifndef __UM_PROCESSOR_GENERIC_H
   7#define __UM_PROCESSOR_GENERIC_H
   8
   9struct pt_regs;
  10
  11struct task_struct;
  12
  13#include "asm/ptrace.h"
  14#include "registers.h"
  15#include "sysdep/archsetjmp.h"
  16
  17struct mm_struct;
  18
  19struct thread_struct {
  20        struct task_struct *saved_task;
  21        /*
  22         * This flag is set to 1 before calling do_fork (and analyzed in
  23         * copy_thread) to mark that we are begin called from userspace (fork /
  24         * vfork / clone), and reset to 0 after. It is left to 0 when called
  25         * from kernelspace (i.e. kernel_thread() or fork_idle(),
  26         * as of 2.6.11).
  27         */
  28        int forking;
  29        struct pt_regs regs;
  30        int singlestep_syscall;
  31        void *fault_addr;
  32        jmp_buf *fault_catcher;
  33        struct task_struct *prev_sched;
  34        unsigned long temp_stack;
  35        jmp_buf *exec_buf;
  36        struct arch_thread arch;
  37        jmp_buf switch_buf;
  38        int mm_count;
  39        struct {
  40                int op;
  41                union {
  42                        struct {
  43                                int pid;
  44                        } fork, exec;
  45                        struct {
  46                                int (*proc)(void *);
  47                                void *arg;
  48                        } thread;
  49                        struct {
  50                                void (*proc)(void *);
  51                                void *arg;
  52                        } cb;
  53                } u;
  54        } request;
  55};
  56
  57#define INIT_THREAD \
  58{ \
  59        .forking                = 0, \
  60        .regs                   = EMPTY_REGS,   \
  61        .fault_addr             = NULL, \
  62        .prev_sched             = NULL, \
  63        .temp_stack             = 0, \
  64        .exec_buf               = NULL, \
  65        .arch                   = INIT_ARCH_THREAD, \
  66        .request                = { 0 } \
  67}
  68
  69extern struct task_struct *alloc_task_struct(void);
  70
  71static inline void release_thread(struct task_struct *task)
  72{
  73}
  74
  75extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  76
  77static inline void prepare_to_copy(struct task_struct *tsk)
  78{
  79}
  80
  81
  82extern unsigned long thread_saved_pc(struct task_struct *t);
  83
  84static inline void mm_copy_segments(struct mm_struct *from_mm,
  85                                    struct mm_struct *new_mm)
  86{
  87}
  88
  89#define init_stack      (init_thread_union.stack)
  90
  91/*
  92 * User space process size: 3GB (default).
  93 */
  94extern unsigned long task_size;
  95
  96#define TASK_SIZE (task_size)
  97
  98#undef STACK_TOP
  99#undef STACK_TOP_MAX
 100
 101extern unsigned long stacksizelim;
 102
 103#define STACK_ROOM      (stacksizelim)
 104#define STACK_TOP       (TASK_SIZE - 2 * PAGE_SIZE)
 105#define STACK_TOP_MAX   STACK_TOP
 106
 107/* This decides where the kernel will search for a free chunk of vm
 108 * space during mmap's.
 109 */
 110#define TASK_UNMAPPED_BASE      (0x40000000)
 111
 112extern void start_thread(struct pt_regs *regs, unsigned long entry, 
 113                         unsigned long stack);
 114
 115struct cpuinfo_um {
 116        unsigned long loops_per_jiffy;
 117        int ipi_pipe[2];
 118};
 119
 120extern struct cpuinfo_um boot_cpu_data;
 121
 122#define my_cpu_data             cpu_data[smp_processor_id()]
 123
 124#ifdef CONFIG_SMP
 125extern struct cpuinfo_um cpu_data[];
 126#define current_cpu_data cpu_data[smp_processor_id()]
 127#else
 128#define cpu_data (&boot_cpu_data)
 129#define current_cpu_data boot_cpu_data
 130#endif
 131
 132
 133#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 134extern unsigned long get_wchan(struct task_struct *p);
 135
 136#endif
 137