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 #include "registers.h"
  17
  18 struct mm_struct;
  19
  20 struct thread_struct {
  21         /* This flag is set to 1 before calling do_fork (and analyzed in
  22          * copy_thread) to mark that we are begin called from userspace (fork /
  23          * vfork / clone), and reset to 0 after. It is left to 0 when called
  24          * from kernelspace (i.e. kernel_thread() or fork_idle(), as of 2.6.11). */
  25         struct task_struct *saved_task;
  26         int forking;
  27         int nsyscalls;
  28         struct pt_regs regs;
  29         int singlestep_syscall;
  30         void *fault_addr;
  31         void *fault_catcher;
  32         struct task_struct *prev_sched;
  33         unsigned long temp_stack;
  34         void *exec_buf;
  35         struct arch_thread arch;
  36         union {
  37 #ifdef CONFIG_MODE_TT
  38                 struct {
  39                         int extern_pid;
  40                         int tracing;
  41                         int switch_pipe[2];
  42                         int vm_seq;
  43                 } tt;
  44 #endif
  45 #ifdef CONFIG_MODE_SKAS
  46                 struct {
  47                         void *switch_buf;
  48                         void *fork_buf;
  49                         int mm_count;
  50                 } skas;
  51 #endif
  52         } mode;
  53         struct {
  54                 int op;
  55                 union {
  56                         struct {
  57                                 int pid;
  58                         } fork, exec;
  59                         struct {
  60                                 int (*proc)(void *);
  61                                 void *arg;
  62                         } thread;
  63                         struct {
  64                                 void (*proc)(void *);
  65                                 void *arg;
  66                         } cb;
  67                 } u;
  68         } request;
  69 };
  70
  71 #define INIT_THREAD \
  72 { \
  73         .forking                = 0, \
  74         .nsyscalls              = 0, \
  75         .regs                   = EMPTY_REGS, \
  76         .fault_addr             = NULL, \
  77         .prev_sched             = NULL, \
  78         .temp_stack             = 0, \
  79         .exec_buf               = NULL, \
  80         .arch                   = INIT_ARCH_THREAD, \
  81         .request                = { 0 } \
  82 }
  83
  84 typedef struct {
  85         unsigned long seg;
  86 } mm_segment_t;
  87
  88 extern struct task_struct *alloc_task_struct(void);
  89
  90 extern void release_thread(struct task_struct *);
  91 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  92
  93 static inline void prepare_to_copy(struct task_struct *tsk)
  94 {
  95 }
  96
  97
  98 extern unsigned long thread_saved_pc(struct task_struct *t);
  99
 100 static inline void mm_copy_segments(struct mm_struct *from_mm,
 101                                     struct mm_struct *new_mm)
 102 {
 103 }
 104
 105 #define init_stack      (init_thread_union.stack)
 106
 107 /*
 108  * User space process size: 3GB (default).
 109  */
 110 extern unsigned long task_size;
 111
 112 #define TASK_SIZE       (task_size)
 113
 114 /* This decides where the kernel will search for a free chunk of vm
 115  * space during mmap's.
 116  */
 117 #define TASK_UNMAPPED_BASE      (0x40000000)
 118
 119 extern void start_thread(struct pt_regs *regs, unsigned long entry,
 120                          unsigned long stack);
 121
 122 struct cpuinfo_um {
 123         unsigned long loops_per_jiffy;
 124         int ipi_pipe[2];
 125 };
 126
 127 extern struct cpuinfo_um boot_cpu_data;
 128
 129 #define my_cpu_data             cpu_data[smp_processor_id()]
 130
 131 #ifdef CONFIG_SMP
 132 extern struct cpuinfo_um cpu_data[];
 133 #define current_cpu_data cpu_data[smp_processor_id()]
 134 #else
 135 #define cpu_data (&boot_cpu_data)
 136 #define current_cpu_data boot_cpu_data
 137 #endif
 138
 139
 140 #ifdef CONFIG_MODE_SKAS
 141 #define KSTK_REG(tsk, reg) \
 142         ({ union uml_pt_regs regs; \
 143            get_thread_regs(&regs, tsk->thread.mode.skas.switch_buf); \
 144            UPT_REG(&regs, reg); })
 145 #else
 146 #define KSTK_REG(tsk, reg) (0xbadbabe)
 147 #endif
 148 #define get_wchan(p) (0)
 149
 150 #endif