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 #include <linux/prefetch.h>
  18
  19 struct mm_struct;
  20
  21 struct thread_struct {
  22         struct task_struct *saved_task;
  23         struct pt_regs regs;
  24         int singlestep_syscall;
  25         void *fault_addr;
  26         jmp_buf *fault_catcher;
  27         struct task_struct *prev_sched;
  28         unsigned long temp_stack;
  29         jmp_buf *exec_buf;
  30         struct arch_thread arch;
  31         jmp_buf switch_buf;
  32         int mm_count;
  33         struct {
  34                 int op;
  35                 union {
  36                         struct {
  37                                 int pid;
  38                         } fork, exec;
  39                         struct {
  40                                 int (*proc)(void *);
  41                                 void *arg;
  42                         } thread;
  43                         struct {
  44                                 void (*proc)(void *);
  45                                 void *arg;
  46                         } cb;
  47                 } u;
  48         } request;
  49 };
  50
  51 #define INIT_THREAD \
  52 { \
  53         .regs                   = EMPTY_REGS,   \
  54         .fault_addr             = NULL, \
  55         .prev_sched             = NULL, \
  56         .temp_stack             = 0, \
  57         .exec_buf               = NULL, \
  58         .arch                   = INIT_ARCH_THREAD, \
  59         .request                = { 0 } \
  60 }
  61
  62 static inline void release_thread(struct task_struct *task)
  63 {
  64 }
  65
  66 extern unsigned long thread_saved_pc(struct task_struct *t);
  67
  68 static inline void mm_copy_segments(struct mm_struct *from_mm,
  69                                     struct mm_struct *new_mm)
  70 {
  71 }
  72
  73 #define init_stack      (init_thread_union.stack)
  74
  75 /*
  76  * User space process size: 3GB (default).
  77  */
  78 extern unsigned long task_size;
  79
  80 #define TASK_SIZE (task_size)
  81
  82 #undef STACK_TOP
  83 #undef STACK_TOP_MAX
  84
  85 extern unsigned long stacksizelim;
  86
  87 #define STACK_ROOM      (stacksizelim)
  88 #define STACK_TOP       (TASK_SIZE - 2 * PAGE_SIZE)
  89 #define STACK_TOP_MAX   STACK_TOP
  90
  91 /* This decides where the kernel will search for a free chunk of vm
  92  * space during mmap's.
  93  */
  94 #define TASK_UNMAPPED_BASE      (0x40000000)
  95
  96 extern void start_thread(struct pt_regs *regs, unsigned long entry,
  97                          unsigned long stack);
  98
  99 struct cpuinfo_um {
 100         unsigned long loops_per_jiffy;
 101         int ipi_pipe[2];
 102 };
 103
 104 extern struct cpuinfo_um boot_cpu_data;
 105
 106 #define my_cpu_data             cpu_data[smp_processor_id()]
 107
 108 #ifdef CONFIG_SMP
 109 extern struct cpuinfo_um cpu_data[];
 110 #define current_cpu_data cpu_data[smp_processor_id()]
 111 #else
 112 #define cpu_data (&boot_cpu_data)
 113 #define current_cpu_data boot_cpu_data
 114 #endif
 115
 116
 117 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 118 extern unsigned long get_wchan(struct task_struct *p);
 119
 120 #endif