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