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 	struct task_struct *prev_sched;
26 	struct arch_thread arch;
27 	jmp_buf switch_buf;
28 	struct {
29 		struct {
30 			int (*proc)(void *);
31 			void *arg;
32 		} thread;
33 	} request;
34 };
35 
36 #define INIT_THREAD \
37 { \
38 	.regs		   	= EMPTY_REGS,	\
39 	.prev_sched		= NULL, \
40 	.arch			= INIT_ARCH_THREAD, \
41 	.request		= { } \
42 }
43 
44 /*
45  * User space process size: 3GB (default).
46  */
47 extern unsigned long task_size;
48 
49 #define TASK_SIZE (task_size)
50 
51 #undef STACK_TOP
52 #undef STACK_TOP_MAX
53 
54 extern unsigned long stacksizelim;
55 
56 #define STACK_ROOM	(stacksizelim)
57 #define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
58 #define STACK_TOP_MAX	STACK_TOP
59 
60 /* This decides where the kernel will search for a free chunk of vm
61  * space during mmap's.
62  */
63 #define TASK_UNMAPPED_BASE	(0x40000000)
64 
65 extern void start_thread(struct pt_regs *regs, unsigned long entry,
66 			 unsigned long stack);
67 
68 struct cpuinfo_um {
69 	unsigned long loops_per_jiffy;
70 	int ipi_pipe[2];
71 	int cache_alignment;
72 	union {
73 		__u32		x86_capability[NCAPINTS + NBUGINTS];
74 		unsigned long	x86_capability_alignment;
75 	};
76 };
77 
78 extern struct cpuinfo_um boot_cpu_data;
79 
80 #define cpu_data(cpu)    boot_cpu_data
81 #define current_cpu_data boot_cpu_data
82 #define cache_line_size()	(boot_cpu_data.cache_alignment)
83 
84 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
85 extern unsigned long __get_wchan(struct task_struct *p);
86 
87 #endif
88