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
58/*
59 * User space process size: 3GB (default).
60 */
61extern unsigned long task_size;
62
63#define TASK_SIZE (task_size)
64
65#undef STACK_TOP
66#undef STACK_TOP_MAX
67
68extern unsigned long stacksizelim;
69
70#define STACK_ROOM	(stacksizelim)
71#define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
72#define STACK_TOP_MAX	STACK_TOP
73
74/* This decides where the kernel will search for a free chunk of vm
75 * space during mmap's.
76 */
77#define TASK_UNMAPPED_BASE	(0x40000000)
78
79extern void start_thread(struct pt_regs *regs, unsigned long entry,
80			 unsigned long stack);
81
82struct cpuinfo_um {
83	unsigned long loops_per_jiffy;
84	int ipi_pipe[2];
85	int cache_alignment;
86	union {
87		__u32		x86_capability[NCAPINTS + NBUGINTS];
88		unsigned long	x86_capability_alignment;
89	};
90};
91
92extern struct cpuinfo_um boot_cpu_data;
93
94#define cpu_data(cpu)    boot_cpu_data
95#define current_cpu_data boot_cpu_data
96#define cache_line_size()	(boot_cpu_data.cache_alignment)
97
98extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
99#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
100extern unsigned long __get_wchan(struct task_struct *p);
101
102#endif
103