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