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