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         struct pt_regs *segv_regs;
  25         int singlestep_syscall;
  26         void *fault_addr;
  27         jmp_buf *fault_catcher;
  28         struct task_struct *prev_sched;
  29         unsigned long temp_stack;
  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         .arch                   = INIT_ARCH_THREAD, \
  58         .request                = { 0 } \
  59 }
  60
  61 static inline void release_thread(struct task_struct *task)
  62 {
  63 }
  64
  65 extern unsigned long thread_saved_pc(struct task_struct *t);
  66
  67 static inline void mm_copy_segments(struct mm_struct *from_mm,
  68                                     struct mm_struct *new_mm)
  69 {
  70 }
  71
  72 #define init_stack      (init_thread_union.stack)
  73
  74 /*
  75  * User space process size: 3GB (default).
  76  */
  77 extern unsigned long task_size;
  78
  79 #define TASK_SIZE (task_size)
  80
  81 #undef STACK_TOP
  82 #undef STACK_TOP_MAX
  83
  84 extern unsigned long stacksizelim;
  85
  86 #define STACK_ROOM      (stacksizelim)
  87 #define STACK_TOP       (TASK_SIZE - 2 * PAGE_SIZE)
  88 #define STACK_TOP_MAX   STACK_TOP
  89
  90 /* This decides where the kernel will search for a free chunk of vm
  91  * space during mmap's.
  92  */
  93 #define TASK_UNMAPPED_BASE      (0x40000000)
  94
  95 extern void start_thread(struct pt_regs *regs, unsigned long entry,
  96                          unsigned long stack);
  97
  98 struct cpuinfo_um {
  99         unsigned long loops_per_jiffy;
 100         int ipi_pipe[2];
 101 };
 102
 103 extern struct cpuinfo_um boot_cpu_data;
 104
 105 #define my_cpu_data             cpu_data[smp_processor_id()]
 106
 107 #ifdef CONFIG_SMP
 108 extern struct cpuinfo_um cpu_data[];
 109 #define current_cpu_data cpu_data[smp_processor_id()]
 110 #else
 111 #define cpu_data (&boot_cpu_data)
 112 #define current_cpu_data boot_cpu_data
 113 #endif
 114
 115
 116 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 117 extern unsigned long get_wchan(struct task_struct *p);
 118
 119 #endif