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 "linux/config.h"
  14 #include "asm/ptrace.h"
  15 #include "choose-mode.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         int forking;
  25         int nsyscalls;
  26         struct pt_regs regs;
  27         int singlestep_syscall;
  28         void *fault_addr;
  29         void *fault_catcher;
  30         struct task_struct *prev_sched;
  31         unsigned long temp_stack;
  32         void *exec_buf;
  33         struct arch_thread arch;
  34         union {
  35 #ifdef CONFIG_MODE_TT
  36                 struct {
  37                         int extern_pid;
  38                         int tracing;
  39                         int switch_pipe[2];
  40                         int vm_seq;
  41                 } tt;
  42 #endif
  43 #ifdef CONFIG_MODE_SKAS
  44                 struct {
  45                         void *switch_buf;
  46                         void *fork_buf;
  47                         int mm_count;
  48                 } skas;
  49 #endif
  50         } mode;
  51         struct {
  52                 int op;
  53                 union {
  54                         struct {
  55                                 int pid;
  56                         } fork, exec;
  57                         struct {
  58                                 int (*proc)(void *);
  59                                 void *arg;
  60                         } thread;
  61                         struct {
  62                                 void (*proc)(void *);
  63                                 void *arg;
  64                         } cb;
  65                 } u;
  66         } request;
  67 };
  68
  69 #define INIT_THREAD \
  70 { \
  71         .forking                = 0, \
  72         .nsyscalls              = 0, \
  73         .regs                   = EMPTY_REGS, \
  74         .fault_addr             = NULL, \
  75         .prev_sched             = NULL, \
  76         .temp_stack             = 0, \
  77         .exec_buf               = NULL, \
  78         .arch                   = INIT_ARCH_THREAD, \
  79         .request                = { 0 } \
  80 }
  81
  82 typedef struct {
  83         unsigned long seg;
  84 } mm_segment_t;
  85
  86 extern struct task_struct *alloc_task_struct(void);
  87
  88 extern void release_thread(struct task_struct *);
  89 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  90 extern void dump_thread(struct pt_regs *regs, struct user *u);
  91
  92 static inline void prepare_to_copy(struct task_struct *tsk)
  93 {
  94 }
  95
  96
  97 extern unsigned long thread_saved_pc(struct task_struct *t);
  98
  99 static inline void mm_copy_segments(struct mm_struct *from_mm,
 100                                     struct mm_struct *new_mm)
 101 {
 102 }
 103
 104 #define init_stack      (init_thread_union.stack)
 105
 106 /*
 107  * User space process size: 3GB (default).
 108  */
 109 extern unsigned long task_size;
 110
 111 #define TASK_SIZE       (task_size)
 112
 113 /* This decides where the kernel will search for a free chunk of vm
 114  * space during mmap's.
 115  */
 116 #define TASK_UNMAPPED_BASE      (0x40000000)
 117
 118 extern void start_thread(struct pt_regs *regs, unsigned long entry,
 119                          unsigned long stack);
 120
 121 struct cpuinfo_um {
 122         unsigned long loops_per_jiffy;
 123         int ipi_pipe[2];
 124 };
 125
 126 extern struct cpuinfo_um boot_cpu_data;
 127
 128 #define my_cpu_data             cpu_data[smp_processor_id()]
 129
 130 #ifdef CONFIG_SMP
 131 extern struct cpuinfo_um cpu_data[];
 132 #define current_cpu_data cpu_data[smp_processor_id()]
 133 #else
 134 #define cpu_data (&boot_cpu_data)
 135 #define current_cpu_data boot_cpu_data
 136 #endif
 137
 138 #define KSTK_EIP(tsk) (PT_REGS_IP(&tsk->thread.regs))
 139 #define KSTK_ESP(tsk) (PT_REGS_SP(&tsk->thread.regs))
 140 #define get_wchan(p) (0)
 141
 142 #endif
 143
 144 /*
 145  * Overrides for Emacs so that we follow Linus's tabbing style.
 146  * Emacs will notice this stuff at the end of the file and automatically
 147  * adjust the settings for this buffer only.  This must remain at the end
 148  * of the file.
 149  * ---------------------------------------------------------------------------
 150  * Local variables:
 151  * c-file-style: "linux"
 152  * End:
 153  */