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
   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         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
  69 extern struct task_struct *alloc_task_struct(void);
  70
  71 static inline void release_thread(struct task_struct *task)
  72 {
  73 }
  74
  75 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  76
  77 static inline void prepare_to_copy(struct task_struct *tsk)
  78 {
  79 }
  80
  81
  82 extern unsigned long thread_saved_pc(struct task_struct *t);
  83
  84 static 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  */
  94 extern unsigned long task_size;
  95
  96 #define TASK_SIZE (task_size)
  97
  98 #undef STACK_TOP
  99 #undef STACK_TOP_MAX
 100
 101 extern 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
 112 extern void start_thread(struct pt_regs *regs, unsigned long entry,
 113                          unsigned long stack);
 114
 115 struct cpuinfo_um {
 116         unsigned long loops_per_jiffy;
 117         int ipi_pipe[2];
 118 };
 119
 120 extern struct cpuinfo_um boot_cpu_data;
 121
 122 #define my_cpu_data             cpu_data[smp_processor_id()]
 123
 124 #ifdef CONFIG_SMP
 125 extern 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)
 134 extern unsigned long get_wchan(struct task_struct *p);
 135
 136 #endif