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