include/asm-um/processor-generic.h

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.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 "registers.h"
  15 #include "sysdep/archsetjmp.h"
  16
  17 struct mm_struct;
  18
  19 struct thread_struct {
  20         /* This flag is set to 1 before calling do_fork (and analyzed in
  21          * copy_thread) to mark that we are begin called from userspace (fork /
  22          * vfork / clone), and reset to 0 after. It is left to 0 when called
  23          * from kernelspace (i.e. kernel_thread() or fork_idle(), as of 2.6.11). */
  24         struct task_struct *saved_task;
  25         int forking;
  26         int nsyscalls;
  27         struct pt_regs regs;
  28         int singlestep_syscall;
  29         void *fault_addr;
  30         void *fault_catcher;
  31         struct task_struct *prev_sched;
  32         unsigned long temp_stack;
  33         void *exec_buf;
  34         struct arch_thread arch;
  35         jmp_buf switch_buf;
  36         int mm_count;
  37         struct {
  38                 int op;
  39                 union {
  40                         struct {
  41                                 int pid;
  42                         } fork, exec;
  43                         struct {
  44                                 int (*proc)(void *);
  45                                 void *arg;
  46                         } thread;
  47                         struct {
  48                                 void (*proc)(void *);
  49                                 void *arg;
  50                         } cb;
  51                 } u;
  52         } request;
  53 };
  54
  55 #define INIT_THREAD \
  56 { \
  57         .forking                = 0, \
  58         .nsyscalls              = 0, \
  59         .regs                   = EMPTY_REGS, \
  60         .fault_addr             = NULL, \
  61         .prev_sched             = NULL, \
  62         .temp_stack             = 0, \
  63         .exec_buf               = NULL, \
  64         .arch                   = INIT_ARCH_THREAD, \
  65         .request                = { 0 } \
  66 }
  67
  68 typedef struct {
  69         unsigned long seg;
  70 } mm_segment_t;
  71
  72 extern struct task_struct *alloc_task_struct(void);
  73
  74 static inline void release_thread(struct task_struct *task)
  75 {
  76 }
  77
  78 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  79
  80 static inline void prepare_to_copy(struct task_struct *tsk)
  81 {
  82 }
  83
  84
  85 extern unsigned long thread_saved_pc(struct task_struct *t);
  86
  87 static inline void mm_copy_segments(struct mm_struct *from_mm,
  88                                     struct mm_struct *new_mm)
  89 {
  90 }
  91
  92 #define init_stack      (init_thread_union.stack)
  93
  94 /*
  95  * User space process size: 3GB (default).
  96  */
  97 extern unsigned long task_size;
  98
  99 #define TASK_SIZE       (task_size)
 100
 101 /* This decides where the kernel will search for a free chunk of vm
 102  * space during mmap's.
 103  */
 104 #define TASK_UNMAPPED_BASE      (0x40000000)
 105
 106 extern void start_thread(struct pt_regs *regs, unsigned long entry,
 107                          unsigned long stack);
 108
 109 struct cpuinfo_um {
 110         unsigned long loops_per_jiffy;
 111         int ipi_pipe[2];
 112 };
 113
 114 extern struct cpuinfo_um boot_cpu_data;
 115
 116 #define my_cpu_data             cpu_data[smp_processor_id()]
 117
 118 #ifdef CONFIG_SMP
 119 extern struct cpuinfo_um cpu_data[];
 120 #define current_cpu_data cpu_data[smp_processor_id()]
 121 #else
 122 #define cpu_data (&boot_cpu_data)
 123 #define current_cpu_data boot_cpu_data
 124 #endif
 125
 126
 127 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 128 #define get_wchan(p) (0)
 129
 130 #endif