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 struct mm_struct;
20
21 struct thread_struct {
22 struct pt_regs regs;
23 struct pt_regs *segv_regs;
24 int singlestep_syscall;
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
release_thread(struct task_struct * task)57 static inline void release_thread(struct task_struct *task)
58 {
59 }
60
mm_copy_segments(struct mm_struct * from_mm,struct mm_struct * new_mm)61 static inline void mm_copy_segments(struct mm_struct *from_mm,
62 struct mm_struct *new_mm)
63 {
64 }
65
66 /*
67 * User space process size: 3GB (default).
68 */
69 extern unsigned long task_size;
70
71 #define TASK_SIZE (task_size)
72
73 #undef STACK_TOP
74 #undef STACK_TOP_MAX
75
76 extern unsigned long stacksizelim;
77
78 #define STACK_ROOM (stacksizelim)
79 #define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
80 #define STACK_TOP_MAX STACK_TOP
81
82 /* This decides where the kernel will search for a free chunk of vm
83 * space during mmap's.
84 */
85 #define TASK_UNMAPPED_BASE (0x40000000)
86
87 extern void start_thread(struct pt_regs *regs, unsigned long entry,
88 unsigned long stack);
89
90 struct cpuinfo_um {
91 unsigned long loops_per_jiffy;
92 int ipi_pipe[2];
93 };
94
95 extern struct cpuinfo_um boot_cpu_data;
96
97 #define cpu_data (&boot_cpu_data)
98 #define current_cpu_data boot_cpu_data
99
100 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
101 extern unsigned long get_wchan(struct task_struct *p);
102
103 #endif
104