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