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 "asm/ptrace.h"
  14 #include "choose-mode.h"
  15 #include "registers.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         struct task_struct *saved_task;
  25         int forking;
  26         int nsyscalls;
  27         struct pt_regs regs;
  28         int singlestep_syscall;
  29         void *fault_addr;
  30         void *fault_catcher;
  31         struct task_struct *prev_sched;
  32         unsigned long temp_stack;
  33         void *exec_buf;
  34         struct arch_thread arch;
  35         union {
  36 #ifdef CONFIG_MODE_TT
  37                 struct {
  38                         int extern_pid;
  39                         int tracing;
  40                         int switch_pipe[2];
  41                         int vm_seq;
  42                 } tt;
  43 #endif
  44 #ifdef CONFIG_MODE_SKAS
  45                 struct {
  46                         void *switch_buf;
  47                         void *fork_buf;
  48                         int mm_count;
  49                 } skas;
  50 #endif
  51         } mode;
  52         struct {
  53                 int op;
  54                 union {
  55                         struct {
  56                                 int pid;
  57                         } fork, exec;
  58                         struct {
  59                                 int (*proc)(void *);
  60                                 void *arg;
  61                         } thread;
  62                         struct {
  63                                 void (*proc)(void *);
  64                                 void *arg;
  65                         } cb;
  66                 } u;
  67         } request;
  68 };
  69
  70 #define INIT_THREAD \
  71 { \
  72         .forking                = 0, \
  73         .nsyscalls              = 0, \
  74         .regs                   = EMPTY_REGS, \
  75         .fault_addr             = NULL, \
  76         .prev_sched             = NULL, \
  77         .temp_stack             = 0, \
  78         .exec_buf               = NULL, \
  79         .arch                   = INIT_ARCH_THREAD, \
  80         .request                = { 0 } \
  81 }
  82
  83 typedef struct {
  84         unsigned long seg;
  85 } mm_segment_t;
  86
  87 extern struct task_struct *alloc_task_struct(void);
  88
  89 extern void release_thread(struct task_struct *);
  90 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  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
 139 #ifdef CONFIG_MODE_SKAS
 140 #define KSTK_REG(tsk, reg) \
 141         ({ union uml_pt_regs regs; \
 142            get_thread_regs(&regs, tsk->thread.mode.skas.switch_buf); \
 143            UPT_REG(&regs, reg); })
 144 #else
 145 #define KSTK_REG(tsk, reg) (0xbadbabe)
 146 #endif
 147 #define get_wchan(p) (0)
 148
 149 #endif