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 pt_regs regs;
23 	struct pt_regs *segv_regs;
24 	int singlestep_syscall;
25 	void *fault_addr;
26 	jmp_buf *fault_catcher;
27 	struct task_struct *prev_sched;
28 	struct arch_thread arch;
29 	jmp_buf switch_buf;
30 	struct {
31 		int op;
32 		union {
33 			struct {
34 				int pid;
35 			} fork, exec;
36 			struct {
37 				int (*proc)(void *);
38 				void *arg;
39 			} thread;
40 			struct {
41 				void (*proc)(void *);
42 				void *arg;
43 			} cb;
44 		} u;
45 	} request;
46 };
47 
48 #define INIT_THREAD \
49 { \
50 	.regs		   	= EMPTY_REGS,	\
51 	.fault_addr		= NULL, \
52 	.prev_sched		= NULL, \
53 	.arch			= INIT_ARCH_THREAD, \
54 	.request		= { 0 } \
55 }
56 
57 static inline void release_thread(struct task_struct *task)
58 {
59 }
60 
61 static inline void mm_copy_segments(struct mm_struct *from_mm,
62 				    struct mm_struct *new_mm)
63 {
64 }
65 
66 #define init_stack	(init_thread_union.stack)
67 
68 /*
69  * User space process size: 3GB (default).
70  */
71 extern unsigned long task_size;
72 
73 #define TASK_SIZE (task_size)
74 
75 #undef STACK_TOP
76 #undef STACK_TOP_MAX
77 
78 extern unsigned long stacksizelim;
79 
80 #define STACK_ROOM	(stacksizelim)
81 #define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
82 #define STACK_TOP_MAX	STACK_TOP
83 
84 /* This decides where the kernel will search for a free chunk of vm
85  * space during mmap's.
86  */
87 #define TASK_UNMAPPED_BASE	(0x40000000)
88 
89 extern void start_thread(struct pt_regs *regs, unsigned long entry,
90 			 unsigned long stack);
91 
92 struct cpuinfo_um {
93 	unsigned long loops_per_jiffy;
94 	int ipi_pipe[2];
95 };
96 
97 extern struct cpuinfo_um boot_cpu_data;
98 
99 #define cpu_data (&boot_cpu_data)
100 #define current_cpu_data boot_cpu_data
101 
102 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
103 extern unsigned long get_wchan(struct task_struct *p);
104 
105 #endif
106