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