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 	struct pt_regs regs;
24 	int singlestep_syscall;
25 	void *fault_addr;
26 	jmp_buf *fault_catcher;
27 	struct task_struct *prev_sched;
28 	unsigned long temp_stack;
29 	struct arch_thread arch;
30 	jmp_buf switch_buf;
31 	int mm_count;
32 	struct {
33 		int op;
34 		union {
35 			struct {
36 				int pid;
37 			} fork, exec;
38 			struct {
39 				int (*proc)(void *);
40 				void *arg;
41 			} thread;
42 			struct {
43 				void (*proc)(void *);
44 				void *arg;
45 			} cb;
46 		} u;
47 	} request;
48 };
49 
50 #define INIT_THREAD \
51 { \
52 	.regs		   	= EMPTY_REGS,	\
53 	.fault_addr		= NULL, \
54 	.prev_sched		= NULL, \
55 	.temp_stack		= 0, \
56 	.arch			= INIT_ARCH_THREAD, \
57 	.request		= { 0 } \
58 }
59 
60 static inline void release_thread(struct task_struct *task)
61 {
62 }
63 
64 extern unsigned long thread_saved_pc(struct task_struct *t);
65 
66 static inline void mm_copy_segments(struct mm_struct *from_mm,
67 				    struct mm_struct *new_mm)
68 {
69 }
70 
71 #define init_stack	(init_thread_union.stack)
72 
73 /*
74  * User space process size: 3GB (default).
75  */
76 extern unsigned long task_size;
77 
78 #define TASK_SIZE (task_size)
79 
80 #undef STACK_TOP
81 #undef STACK_TOP_MAX
82 
83 extern unsigned long stacksizelim;
84 
85 #define STACK_ROOM	(stacksizelim)
86 #define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
87 #define STACK_TOP_MAX	STACK_TOP
88 
89 /* This decides where the kernel will search for a free chunk of vm
90  * space during mmap's.
91  */
92 #define TASK_UNMAPPED_BASE	(0x40000000)
93 
94 extern void start_thread(struct pt_regs *regs, unsigned long entry,
95 			 unsigned long stack);
96 
97 struct cpuinfo_um {
98 	unsigned long loops_per_jiffy;
99 	int ipi_pipe[2];
100 };
101 
102 extern struct cpuinfo_um boot_cpu_data;
103 
104 #define my_cpu_data		cpu_data[smp_processor_id()]
105 
106 #ifdef CONFIG_SMP
107 extern struct cpuinfo_um cpu_data[];
108 #define current_cpu_data cpu_data[smp_processor_id()]
109 #else
110 #define cpu_data (&boot_cpu_data)
111 #define current_cpu_data boot_cpu_data
112 #endif
113 
114 
115 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
116 extern unsigned long get_wchan(struct task_struct *p);
117 
118 #endif
119