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
9 struct pt_regs;
10
11 struct 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
20 struct mm_struct;
21
22 struct 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 */
60 extern unsigned long task_size;
61
62 #define TASK_SIZE (task_size)
63
64 #undef STACK_TOP
65 #undef STACK_TOP_MAX
66
67 extern 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
78 extern void start_thread(struct pt_regs *regs, unsigned long entry,
79 unsigned long stack);
80
81 struct 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
91 extern 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
97 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
98 extern unsigned long __get_wchan(struct task_struct *p);
99
100 #endif
101
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