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