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 <registers.h>
15 #include <sysdep/archsetjmp.h>
16
17 #include <linux/prefetch.h>
18
19 #include <asm/cpufeatures.h>
20
21 struct mm_struct;
22
23 struct thread_struct {
24 struct pt_regs regs;
25 struct pt_regs *segv_regs;
26 int singlestep_syscall;
27 void *fault_addr;
28 jmp_buf *fault_catcher;
29 struct task_struct *prev_sched;
30 struct arch_thread arch;
31 jmp_buf switch_buf;
32 struct {
33 int op;
34 union {
35 struct {
36 int pid;
37 } fork, exec;
38 struct {
39 int (*proc)(void *);
40 void *arg;
41 } thread;
42 struct {
43 void (*proc)(void *);
44 void *arg;
45 } cb;
46 } u;
47 } request;
48 };
49
50 #define INIT_THREAD \
51 { \
52 .regs = EMPTY_REGS, \
53 .fault_addr = NULL, \
54 .prev_sched = NULL, \
55 .arch = INIT_ARCH_THREAD, \
56 .request = { 0 } \
57 }
58
release_thread(struct task_struct * task)59 static inline void release_thread(struct task_struct *task)
60 {
61 }
62
mm_copy_segments(struct mm_struct * from_mm,struct mm_struct * new_mm)63 static inline void mm_copy_segments(struct mm_struct *from_mm,
64 struct mm_struct *new_mm)
65 {
66 }
67
68 /*
69 * User space process size: 3GB (default).
70 */
71 extern unsigned long task_size;
72
73 #define TASK_SIZE (task_size)
74
75 #undef STACK_TOP
76 #undef STACK_TOP_MAX
77
78 extern unsigned long stacksizelim;
79
80 #define STACK_ROOM (stacksizelim)
81 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
82 #define STACK_TOP_MAX STACK_TOP
83
84 /* This decides where the kernel will search for a free chunk of vm
85 * space during mmap's.
86 */
87 #define TASK_UNMAPPED_BASE (0x40000000)
88
89 extern void start_thread(struct pt_regs *regs, unsigned long entry,
90 unsigned long stack);
91
92 struct cpuinfo_um {
93 unsigned long loops_per_jiffy;
94 int ipi_pipe[2];
95 int cache_alignment;
96 union {
97 __u32 x86_capability[NCAPINTS + NBUGINTS];
98 unsigned long x86_capability_alignment;
99 };
100 };
101
102 extern struct cpuinfo_um boot_cpu_data;
103
104 #define cpu_data (&boot_cpu_data)
105 #define current_cpu_data boot_cpu_data
106 #define cache_line_size() (boot_cpu_data.cache_alignment)
107
108 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
109 extern unsigned long __get_wchan(struct task_struct *p);
110
111 #endif
112