1/*
2 *  linux/include/asm-arm/proc-armo/processor.h
3 *
4 *  Copyright (C) 1996 Russell King.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 *  Changelog:
11 *   27-06-1996	RMK	Created
12 *   10-10-1996	RMK	Brought up to date with SA110
13 *   26-09-1996	RMK	Added 'EXTRA_THREAD_STRUCT*'
14 *   28-09-1996	RMK	Moved start_thread into the processor dependencies
15 *   11-01-1998	RMK	Added new uaccess_t
16 *   09-09-1998	PJB	Delete redundant `wp_works_ok'
17 *   30-05-1999	PJB	Save sl across context switches
18 */
19#ifndef __ASM_PROC_PROCESSOR_H
20#define __ASM_PROC_PROCESSOR_H
21
22#include <linux/string.h>
23
24#define KERNEL_STACK_SIZE 4096
25
26struct context_save_struct {
27	unsigned long r4;
28	unsigned long r5;
29	unsigned long r6;
30	unsigned long r7;
31	unsigned long r8;
32	unsigned long r9;
33	unsigned long sl;
34	unsigned long fp;
35	unsigned long pc;
36};
37
38#define INIT_CSS (struct context_save_struct){ 0, 0, 0, 0, 0, 0, 0, 0, SVC26_MODE }
39
40typedef struct {
41	void (*put_byte)(void);			/* Special calling convention */
42	void (*get_byte)(void);			/* Special calling convention */
43	void (*put_half)(void);			/* Special calling convention */
44	void (*get_half)(void);			/* Special calling convention */
45	void (*put_word)(void);			/* Special calling convention */
46	void (*get_word)(void);			/* Special calling convention */
47	unsigned long (*copy_from_user)(void *to, const void *from, unsigned long sz);
48	unsigned long (*copy_to_user)(void *to, const void *from, unsigned long sz);
49	unsigned long (*clear_user)(void *addr, unsigned long sz);
50	unsigned long (*strncpy_from_user)(char *to, const char *from, unsigned long sz);
51	unsigned long (*strnlen_user)(const char *s, long n);
52} uaccess_t;
53
54extern uaccess_t uaccess_user, uaccess_kernel;
55
56#define EXTRA_THREAD_STRUCT							\
57	uaccess_t	*uaccess;		/* User access functions*/
58
59#define EXTRA_THREAD_STRUCT_INIT		\
60	uaccess:	&uaccess_kernel,
61
62#define start_thread(regs,pc,sp)					\
63({									\
64	unsigned long *stack = (unsigned long *)sp;			\
65	set_fs(USER_DS);						\
66	memzero(regs->uregs, sizeof (regs->uregs));			\
67	regs->ARM_pc = pc;		/* pc */			\
68	regs->ARM_sp = sp;		/* sp */			\
69	regs->ARM_r2 = stack[2];	/* r2 (envp) */			\
70	regs->ARM_r1 = stack[1];	/* r1 (argv) */			\
71	regs->ARM_r0 = stack[0];	/* r0 (argc) */			\
72})
73
74#define KSTK_EIP(tsk)	(((unsigned long *)(4096+(unsigned long)(tsk)))[1022])
75#define KSTK_ESP(tsk)	(((unsigned long *)(4096+(unsigned long)(tsk)))[1020])
76
77/* Allocation and freeing of basic task resources. */
78/*
79 * NOTE! The task struct and the stack go together
80 */
81extern unsigned long get_page_8k(int priority);
82extern void free_page_8k(unsigned long page);
83
84#define ll_alloc_task_struct()	((struct task_struct *)get_page_8k(GFP_KERNEL))
85#define ll_free_task_struct(p)  free_page_8k((unsigned long)(p))
86
87#endif
88