1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#ifndef __UM_PROCESSOR_GENERIC_H
7#define __UM_PROCESSOR_GENERIC_H
8
9struct pt_regs;
10
11struct task_struct;
12
13#include "asm/ptrace.h"
14#include "choose-mode.h"
15#include "registers.h"
16#include "sysdep/archsetjmp.h"
17
18struct mm_struct;
19
20struct thread_struct {
21	/* This flag is set to 1 before calling do_fork (and analyzed in
22	 * copy_thread) to mark that we are begin called from userspace (fork /
23	 * vfork / clone), and reset to 0 after. It is left to 0 when called
24	 * from kernelspace (i.e. kernel_thread() or fork_idle(), as of 2.6.11). */
25	struct task_struct *saved_task;
26	int forking;
27	int nsyscalls;
28	struct pt_regs regs;
29	int singlestep_syscall;
30	void *fault_addr;
31	void *fault_catcher;
32	struct task_struct *prev_sched;
33	unsigned long temp_stack;
34	void *exec_buf;
35	struct arch_thread arch;
36	union {
37#ifdef CONFIG_MODE_TT
38		struct {
39			int extern_pid;
40			int tracing;
41			int switch_pipe[2];
42			int vm_seq;
43		} tt;
44#endif
45#ifdef CONFIG_MODE_SKAS
46		struct {
47			jmp_buf switch_buf;
48			int mm_count;
49		} skas;
50#endif
51	} mode;
52	struct {
53		int op;
54		union {
55			struct {
56				int pid;
57			} fork, exec;
58			struct {
59				int (*proc)(void *);
60				void *arg;
61			} thread;
62			struct {
63				void (*proc)(void *);
64				void *arg;
65			} cb;
66		} u;
67	} request;
68};
69
70#define INIT_THREAD \
71{ \
72	.forking		= 0, \
73	.nsyscalls		= 0, \
74        .regs		   	= EMPTY_REGS, \
75	.fault_addr		= NULL, \
76	.prev_sched		= NULL, \
77	.temp_stack		= 0, \
78	.exec_buf		= NULL, \
79	.arch			= INIT_ARCH_THREAD, \
80	.request		= { 0 } \
81}
82
83typedef struct {
84	unsigned long seg;
85} mm_segment_t;
86
87extern struct task_struct *alloc_task_struct(void);
88
89extern void release_thread(struct task_struct *);
90extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
91
92static inline void prepare_to_copy(struct task_struct *tsk)
93{
94}
95
96
97extern unsigned long thread_saved_pc(struct task_struct *t);
98
99static inline void mm_copy_segments(struct mm_struct *from_mm,
100				    struct mm_struct *new_mm)
101{
102}
103
104#define init_stack	(init_thread_union.stack)
105
106/*
107 * User space process size: 3GB (default).
108 */
109extern unsigned long task_size;
110
111#define TASK_SIZE	(task_size)
112
113/* This decides where the kernel will search for a free chunk of vm
114 * space during mmap's.
115 */
116#define TASK_UNMAPPED_BASE	(0x40000000)
117
118extern void start_thread(struct pt_regs *regs, unsigned long entry,
119			 unsigned long stack);
120
121struct cpuinfo_um {
122	unsigned long loops_per_jiffy;
123	int ipi_pipe[2];
124};
125
126extern struct cpuinfo_um boot_cpu_data;
127
128#define my_cpu_data		cpu_data[smp_processor_id()]
129
130#ifdef CONFIG_SMP
131extern struct cpuinfo_um cpu_data[];
132#define current_cpu_data cpu_data[smp_processor_id()]
133#else
134#define cpu_data (&boot_cpu_data)
135#define current_cpu_data boot_cpu_data
136#endif
137
138
139#ifdef CONFIG_MODE_SKAS
140#define KSTK_REG(tsk, reg) \
141	get_thread_reg(reg, &tsk->thread.mode.skas.switch_buf)
142#else
143#define KSTK_REG(tsk, reg) (0xbadbabe)
144#endif
145#define get_wchan(p) (0)
146
147#endif
148