1/*
2 * include/asm-v850/processor.h
3 *
4 *  Copyright (C) 2001,02,03  NEC Electronics Corporation
5 *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License.  See the file COPYING in the main directory of this
9 * archive for more details.
10 *
11 * Written by Miles Bader <miles@gnu.org>
12 */
13
14#ifndef __V850_PROCESSOR_H__
15#define __V850_PROCESSOR_H__
16
17#ifndef __ASSEMBLY__     /* <linux/thread_info.h> is not asm-safe.  */
18#include <linux/thread_info.h>
19#endif
20
21#include <linux/compiler.h>
22#include <asm/ptrace.h>
23#include <asm/entry.h>
24
25/* Some code expects `segment' stuff to be defined here.  */
26#include <asm/segment.h>
27
28
29/*
30 * The only places this is used seem to be horrible bletcherous kludges,
31 * so we just define it to be as large as possible.
32 */
33#define TASK_SIZE	(0xFFFFFFFF)
34
35/*
36 * This decides where the kernel will search for a free chunk of vm
37 * space during mmap's.  We won't be using it.
38 */
39#define TASK_UNMAPPED_BASE	0
40
41
42#ifndef __ASSEMBLY__
43
44
45/*
46 * Default implementation of macro that returns current
47 * instruction pointer ("program counter").
48 */
49#define current_text_addr()	({ __label__ _l; _l: &&_l;})
50
51/* If you change this, you must change the associated assembly-languages
52   constants defined below, THREAD_*.  */
53struct thread_struct {
54	/* kernel stack pointer (must be first field in structure) */
55	unsigned long  ksp;
56};
57
58#define INIT_THREAD { sizeof init_stack + (unsigned long)init_stack }
59
60
61/* Do necessary setup to start up a newly executed thread.  */
62static inline void start_thread (struct pt_regs *regs,
63				 unsigned long pc, unsigned long usp)
64{
65	regs->pc = pc;
66	regs->gpr[GPR_SP] = usp;
67	regs->kernel_mode = 0;
68}
69
70/* Free all resources held by a thread. */
71static inline void release_thread (struct task_struct *dead_task)
72{
73}
74
75/* Prepare to copy thread state - unlazy all lazy status */
76#define prepare_to_copy(tsk)	do { } while (0)
77
78extern int kernel_thread (int (*fn)(void *), void * arg, unsigned long flags);
79
80/* Free current thread data structures etc.  */
81static inline void exit_thread (void)
82{
83}
84
85
86/* Return the registers saved during context-switch by the currently
87   not-running thread T.  Note that this only includes some registers!
88   See entry.S for details.  */
89#define thread_saved_regs(t) \
90   ((struct pt_regs*)((t)->thread.ksp + STATE_SAVE_PT_OFFSET))
91/* Return saved (kernel) PC of a blocked thread.  Actually, we return the
92   LP register, because the thread is actually blocked in switch_thread,
93   and we're interested in the PC it will _return_ to.  */
94#define thread_saved_pc(t)   (thread_saved_regs(t)->gpr[GPR_LP])
95
96
97unsigned long get_wchan (struct task_struct *p);
98
99
100/* Return some info about the user process TASK.  */
101#define task_tos(task)	((unsigned long)task_stack_page(task) + THREAD_SIZE)
102#define task_pt_regs(task) ((struct pt_regs *)task_tos (task) - 1)
103#define task_sp(task)	(task_pt_regs (task)->gpr[GPR_SP])
104#define task_pc(task)	(task_pt_regs (task)->pc)
105/* Grotty old names for some.  */
106#define KSTK_EIP(task)	task_pc (task)
107#define KSTK_ESP(task)	task_sp (task)
108
109
110#define cpu_relax()    barrier()
111
112
113#else /* __ASSEMBLY__ */
114
115#define THREAD_KSP	0
116
117#endif /* !__ASSEMBLY__ */
118
119
120#endif /* __V850_PROCESSOR_H__ */
121