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 
59 static inline void release_thread(struct task_struct *task)
60 {
61 }
62 
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