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 *segv_regs;
24 	struct task_struct *prev_sched;
25 	struct arch_thread arch;
26 	jmp_buf switch_buf;
27 	struct {
28 		struct {
29 			int (*proc)(void *);
30 			void *arg;
31 		} thread;
32 	} request;
33 
34 	void *segv_continue;
35 
36 	/* Contains variable sized FP registers */
37 	struct pt_regs regs;
38 };
39 
40 #define INIT_THREAD \
41 { \
42 	.regs		   	= EMPTY_REGS,	\
43 	.prev_sched		= NULL, \
44 	.arch			= INIT_ARCH_THREAD, \
45 	.request		= { } \
46 }
47 
48 /*
49  * User space process size: 3GB (default).
50  */
51 extern unsigned long task_size;
52 
53 #define TASK_SIZE (task_size)
54 
55 #undef STACK_TOP
56 #undef STACK_TOP_MAX
57 
58 extern unsigned long stacksizelim;
59 
60 #define STACK_ROOM	(stacksizelim)
61 #define STACK_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
62 #define STACK_TOP_MAX	STACK_TOP
63 
64 /* This decides where the kernel will search for a free chunk of vm
65  * space during mmap's.
66  */
67 #define TASK_UNMAPPED_BASE	(0x40000000)
68 
69 extern void start_thread(struct pt_regs *regs, unsigned long entry,
70 			 unsigned long stack);
71 
72 struct cpuinfo_um {
73 	unsigned long loops_per_jiffy;
74 	int ipi_pipe[2];
75 	int cache_alignment;
76 	union {
77 		__u32		x86_capability[NCAPINTS + NBUGINTS];
78 		unsigned long	x86_capability_alignment;
79 	};
80 };
81 
82 extern struct cpuinfo_um boot_cpu_data;
83 
84 #define cpu_data(cpu)    boot_cpu_data
85 #define current_cpu_data boot_cpu_data
86 #define cache_line_size()	(boot_cpu_data.cache_alignment)
87 
88 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
89 extern unsigned long __get_wchan(struct task_struct *p);
90 
91 #endif
92