processor-generic.h

 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 *segv_regs;
24	struct task_struct *prev_sched;
25	struct arch_thread arch;
26	jmp_buf switch_buf;
27	struct {
28		struct {
29			int (*proc)(void *);
30			void *arg;
31		} thread;
32	} request;
33
34	void *segv_continue;
35
36	/* Contains variable sized FP registers */
37	struct pt_regs regs;
38};
39
40#define INIT_THREAD \
41{ \
42	.regs		   	= EMPTY_REGS,	\
43	.prev_sched		= NULL, \
44	.arch			= INIT_ARCH_THREAD, \
45	.request		= { } \
46}
47
48/*
49 * User space process size: 3GB (default).
50 */
51extern unsigned long task_size;
52
53#define TASK_SIZE (task_size)
54
55#undef STACK_TOP
56#undef STACK_TOP_MAX
57
58extern unsigned long stacksizelim;
59
60#define STACK_ROOM	(stacksizelim)
61#define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
62#define STACK_TOP_MAX	STACK_TOP
63
64/* This decides where the kernel will search for a free chunk of vm
65 * space during mmap's.
66 */
67#define TASK_UNMAPPED_BASE	(0x40000000)
68
69extern void start_thread(struct pt_regs *regs, unsigned long entry, 
70			 unsigned long stack);
71
72struct cpuinfo_um {
73	unsigned long loops_per_jiffy;
74	int cache_alignment;
75	union {
76		__u32		x86_capability[NCAPINTS + NBUGINTS];
77		unsigned long	x86_capability_alignment;
78	};
79};
80
81extern struct cpuinfo_um boot_cpu_data;
82
83#define cache_line_size()	(boot_cpu_data.cache_alignment)
84
85#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
86extern unsigned long __get_wchan(struct task_struct *p);
87
88#endif