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