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 extern struct task_struct *alloc_task_struct_node(int node);
72
release_thread(struct task_struct * task)73 static inline void release_thread(struct task_struct *task)
74 {
75 }
76
77 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
78
prepare_to_copy(struct task_struct * tsk)79 static inline void prepare_to_copy(struct task_struct *tsk)
80 {
81 }
82
83
84 extern unsigned long thread_saved_pc(struct task_struct *t);
85
mm_copy_segments(struct mm_struct * from_mm,struct mm_struct * new_mm)86 static inline void mm_copy_segments(struct mm_struct *from_mm,
87 struct mm_struct *new_mm)
88 {
89 }
90
91 #define init_stack (init_thread_union.stack)
92
93 /*
94 * User space process size: 3GB (default).
95 */
96 extern unsigned long task_size;
97
98 #define TASK_SIZE (task_size)
99
100 #undef STACK_TOP
101 #undef STACK_TOP_MAX
102
103 extern unsigned long stacksizelim;
104
105 #define STACK_ROOM (stacksizelim)
106 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
107 #define STACK_TOP_MAX STACK_TOP
108
109 /* This decides where the kernel will search for a free chunk of vm
110 * space during mmap's.
111 */
112 #define TASK_UNMAPPED_BASE (0x40000000)
113
114 extern void start_thread(struct pt_regs *regs, unsigned long entry,
115 unsigned long stack);
116
117 struct cpuinfo_um {
118 unsigned long loops_per_jiffy;
119 int ipi_pipe[2];
120 };
121
122 extern struct cpuinfo_um boot_cpu_data;
123
124 #define my_cpu_data cpu_data[smp_processor_id()]
125
126 #ifdef CONFIG_SMP
127 extern struct cpuinfo_um cpu_data[];
128 #define current_cpu_data cpu_data[smp_processor_id()]
129 #else
130 #define cpu_data (&boot_cpu_data)
131 #define current_cpu_data boot_cpu_data
132 #endif
133
134
135 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
136 extern unsigned long get_wchan(struct task_struct *p);
137
138 #endif
139