Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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 <sysdep/archsetjmp.h>
15
16#include <linux/prefetch.h>
17
18#include <asm/cpufeatures.h>
19
20struct mm_struct;
21
22struct thread_struct {
23 struct pt_regs regs;
24 struct pt_regs *segv_regs;
25 int singlestep_syscall;
26 void *fault_addr;
27 jmp_buf *fault_catcher;
28 struct task_struct *prev_sched;
29 struct arch_thread arch;
30 jmp_buf switch_buf;
31 struct {
32 int op;
33 union {
34 struct {
35 int pid;
36 } fork, exec;
37 struct {
38 int (*proc)(void *);
39 void *arg;
40 } thread;
41 struct {
42 void (*proc)(void *);
43 void *arg;
44 } cb;
45 } u;
46 } request;
47};
48
49#define INIT_THREAD \
50{ \
51 .regs = EMPTY_REGS, \
52 .fault_addr = NULL, \
53 .prev_sched = NULL, \
54 .arch = INIT_ARCH_THREAD, \
55 .request = { 0 } \
56}
57
58static inline void release_thread(struct task_struct *task)
59{
60}
61
62/*
63 * User space process size: 3GB (default).
64 */
65extern unsigned long task_size;
66
67#define TASK_SIZE (task_size)
68
69#undef STACK_TOP
70#undef STACK_TOP_MAX
71
72extern unsigned long stacksizelim;
73
74#define STACK_ROOM (stacksizelim)
75#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
76#define STACK_TOP_MAX STACK_TOP
77
78/* This decides where the kernel will search for a free chunk of vm
79 * space during mmap's.
80 */
81#define TASK_UNMAPPED_BASE (0x40000000)
82
83extern void start_thread(struct pt_regs *regs, unsigned long entry,
84 unsigned long stack);
85
86struct cpuinfo_um {
87 unsigned long loops_per_jiffy;
88 int ipi_pipe[2];
89 int cache_alignment;
90 union {
91 __u32 x86_capability[NCAPINTS + NBUGINTS];
92 unsigned long x86_capability_alignment;
93 };
94};
95
96extern struct cpuinfo_um boot_cpu_data;
97
98#define cpu_data (&boot_cpu_data)
99#define current_cpu_data boot_cpu_data
100#define cache_line_size() (boot_cpu_data.cache_alignment)
101
102extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
103#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
104extern unsigned long __get_wchan(struct task_struct *p);
105
106#endif