Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 "linux/config.h"
14#include "asm/ptrace.h"
15#include "choose-mode.h"
16#include "registers.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 void *switch_buf;
48 void *fork_buf;
49 int mm_count;
50 } skas;
51#endif
52 } mode;
53 struct {
54 int op;
55 union {
56 struct {
57 int pid;
58 } fork, exec;
59 struct {
60 int (*proc)(void *);
61 void *arg;
62 } thread;
63 struct {
64 void (*proc)(void *);
65 void *arg;
66 } cb;
67 } u;
68 } request;
69};
70
71#define INIT_THREAD \
72{ \
73 .forking = 0, \
74 .nsyscalls = 0, \
75 .regs = EMPTY_REGS, \
76 .fault_addr = NULL, \
77 .prev_sched = NULL, \
78 .temp_stack = 0, \
79 .exec_buf = NULL, \
80 .arch = INIT_ARCH_THREAD, \
81 .request = { 0 } \
82}
83
84typedef struct {
85 unsigned long seg;
86} mm_segment_t;
87
88extern struct task_struct *alloc_task_struct(void);
89
90extern void release_thread(struct task_struct *);
91extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
92
93static inline void prepare_to_copy(struct task_struct *tsk)
94{
95}
96
97
98extern unsigned long thread_saved_pc(struct task_struct *t);
99
100static inline void mm_copy_segments(struct mm_struct *from_mm,
101 struct mm_struct *new_mm)
102{
103}
104
105#define init_stack (init_thread_union.stack)
106
107/*
108 * User space process size: 3GB (default).
109 */
110extern unsigned long task_size;
111
112#define TASK_SIZE (task_size)
113
114/* This decides where the kernel will search for a free chunk of vm
115 * space during mmap's.
116 */
117#define TASK_UNMAPPED_BASE (0x40000000)
118
119extern void start_thread(struct pt_regs *regs, unsigned long entry,
120 unsigned long stack);
121
122struct cpuinfo_um {
123 unsigned long loops_per_jiffy;
124 int ipi_pipe[2];
125};
126
127extern struct cpuinfo_um boot_cpu_data;
128
129#define my_cpu_data cpu_data[smp_processor_id()]
130
131#ifdef CONFIG_SMP
132extern struct cpuinfo_um cpu_data[];
133#define current_cpu_data cpu_data[smp_processor_id()]
134#else
135#define cpu_data (&boot_cpu_data)
136#define current_cpu_data boot_cpu_data
137#endif
138
139
140#ifdef CONFIG_MODE_SKAS
141#define KSTK_REG(tsk, reg) \
142 ({ union uml_pt_regs regs; \
143 get_thread_regs(®s, tsk->thread.mode.skas.switch_buf); \
144 UPT_REG(®s, reg); })
145#else
146#define KSTK_REG(tsk, reg) (0xbadbabe)
147#endif
148#define get_wchan(p) (0)
149
150#endif