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 /*
63  * User space process size: 3GB (default).
64  */
65 extern unsigned long task_size;
66 
67 #define TASK_SIZE (task_size)
68 
69 #undef STACK_TOP
70 #undef STACK_TOP_MAX
71 
72 extern unsigned long stacksizelim;
73 
74 #define STACK_ROOM	(stacksizelim)
75 #define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
76 #define STACK_TOP_MAX	STACK_TOP
77 
78 /* This decides where the kernel will search for a free chunk of vm
79  * space during mmap's.
80  */
81 #define TASK_UNMAPPED_BASE	(0x40000000)
82 
83 extern void start_thread(struct pt_regs *regs, unsigned long entry,
84 			 unsigned long stack);
85 
86 struct cpuinfo_um {
87 	unsigned long loops_per_jiffy;
88 	int ipi_pipe[2];
89 	int cache_alignment;
90 	union {
91 		__u32		x86_capability[NCAPINTS + NBUGINTS];
92 		unsigned long	x86_capability_alignment;
93 	};
94 };
95 
96 extern struct cpuinfo_um boot_cpu_data;
97 
98 #define cpu_data (&boot_cpu_data)
99 #define current_cpu_data boot_cpu_data
100 #define cache_line_size()	(boot_cpu_data.cache_alignment)
101 
102 extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
103 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
104 extern unsigned long __get_wchan(struct task_struct *p);
105 
106 #endif
107