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[linux-2.6.git] / 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 #define current_text_addr() ((void *) 0)
20
21 #define cpu_relax()   barrier()
22
23 #define STACK_PAGE_COUNT        (4096/PAGE_SIZE)
24
25 struct thread_struct {
26         int forking;
27         unsigned long kernel_stack;
28         int nsyscalls;
29         struct pt_regs regs;
30         unsigned long cr2;
31         int err;
32         unsigned long trap_no;
33         void *fault_addr;
34         void *fault_catcher;
35         struct task_struct *prev_sched;
36         unsigned long temp_stack;
37         void *exec_buf;
38         struct arch_thread arch;
39         union {
40 #ifdef CONFIG_MODE_TT
41                 struct {
42                         int extern_pid;
43                         int tracing;
44                         int switch_pipe[2];
45                         int singlestep_syscall;
46                         int vm_seq;
47                 } tt;
48 #endif
49 #ifdef CONFIG_MODE_SKAS
50                 struct {
51                         void *switch_buf;
52                         void *fork_buf;
53                         int mm_count;
54                 } skas;
55 #endif
56         } mode;
57         struct {
58                 int op;
59                 union {
60                         struct {
61                                 int pid;
62                         } fork, exec;
63                         struct {
64                                 int (*proc)(void *);
65                                 void *arg;
66                         } thread;
67                         struct {
68                                 void (*proc)(void *);
69                                 void *arg;
70                         } cb;
71                 } u;
72         } request;
73 };
74
75 #define INIT_THREAD \
76 { \
77         .forking                = 0, \
78         .kernel_stack           = 0, \
79         .nsyscalls              = 0, \
80         .regs                   = EMPTY_REGS, \
81         .cr2                    = 0, \
82         .err                    = 0, \
83         .fault_addr             = NULL, \
84         .prev_sched             = NULL, \
85         .temp_stack             = 0, \
86         .exec_buf               = NULL, \
87         .arch                   = INIT_ARCH_THREAD, \
88         .request                = { 0 } \
89 }
90
91 typedef struct {
92         unsigned long seg;
93 } mm_segment_t;
94
95 extern struct task_struct *alloc_task_struct(void);
96
97 extern void release_thread(struct task_struct *);
98 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
99 extern void dump_thread(struct pt_regs *regs, struct user *u);
100 extern void prepare_to_copy(struct task_struct *tsk);
101
102 extern unsigned long thread_saved_pc(struct task_struct *t);
103
104 static inline void mm_copy_segments(struct mm_struct *from_mm, 
105                                     struct mm_struct *new_mm)
106 {
107 }
108
109 #define init_stack      (init_thread_union.stack)
110
111 /*
112  * User space process size: 3GB (default).
113  */
114 extern unsigned long task_size;
115
116 #undef TASK_SIZE
117 #define TASK_SIZE       (task_size)
118
119 /* This decides where the kernel will search for a free chunk of vm
120  * space during mmap's.
121  */
122 #define TASK_UNMAPPED_BASE      (0x40000000)
123
124 extern void start_thread(struct pt_regs *regs, unsigned long entry, 
125                          unsigned long stack);
126
127 struct cpuinfo_um {
128         unsigned long loops_per_jiffy;
129         int ipi_pipe[2];
130 };
131
132 extern struct cpuinfo_um boot_cpu_data;
133
134 #define my_cpu_data             cpu_data[smp_processor_id()]
135
136 #ifdef CONFIG_SMP
137 extern struct cpuinfo_um cpu_data[];
138 #define current_cpu_data cpu_data[smp_processor_id()]
139 #else
140 #define cpu_data (&boot_cpu_data)
141 #define current_cpu_data boot_cpu_data
142 #endif
143
144 #define KSTK_EIP(tsk) (PT_REGS_IP(&tsk->thread.regs))
145 #define KSTK_ESP(tsk) (PT_REGS_SP(&tsk->thread.regs))
146 #define get_wchan(p) (0)
147
148 #endif
149
150 /*
151  * Overrides for Emacs so that we follow Linus's tabbing style.
152  * Emacs will notice this stuff at the end of the file and automatically
153  * adjust the settings for this buffer only.  This must remain at the end
154  * of the file.
155  * ---------------------------------------------------------------------------
156  * Local variables:
157  * c-file-style: "linux"
158  * End:
159  */