1#ifndef _ASM_M32R_PROCESSOR_H
2#define _ASM_M32R_PROCESSOR_H
3
4/*
5 * include/asm-m32r/processor.h
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License.  See the file "COPYING" in the main directory of this archive
9 * for more details.
10 *
11 * Copyright (C) 1994  Linus Torvalds
12 * Copyright (C) 2001  Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
13 * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
14 */
15
16#include <linux/kernel.h>
17#include <asm/cache.h>
18#include <asm/ptrace.h>  /* pt_regs */
19
20/*
21 * Default implementation of macro that returns current
22 * instruction pointer ("program counter").
23 */
24#define current_text_addr() ({ __label__ _l; _l: &&_l; })
25
26/*
27 *  CPU type and hardware bug flags. Kept separately for each CPU.
28 *  Members of this structure are referenced in head.S, so think twice
29 *  before touching them. [mj]
30 */
31
32struct cpuinfo_m32r {
33	unsigned long pgtable_cache_sz;
34	unsigned long cpu_clock;
35	unsigned long bus_clock;
36	unsigned long timer_divide;
37	unsigned long loops_per_jiffy;
38};
39
40/*
41 * capabilities of CPUs
42 */
43
44extern struct cpuinfo_m32r boot_cpu_data;
45
46#ifdef CONFIG_SMP
47extern struct cpuinfo_m32r cpu_data[];
48#define current_cpu_data cpu_data[smp_processor_id()]
49#else
50#define cpu_data (&boot_cpu_data)
51#define current_cpu_data boot_cpu_data
52#endif
53
54/*
55 * User space process size: 2GB (default).
56 */
57#ifdef CONFIG_MMU
58#define TASK_SIZE  (0x80000000UL)
59#else
60#define TASK_SIZE  (0x00400000UL)
61#endif
62
63#ifdef __KERNEL__
64#define STACK_TOP	TASK_SIZE
65#define STACK_TOP_MAX	STACK_TOP
66#endif
67
68/* This decides where the kernel will search for a free chunk of vm
69 * space during mmap's.
70 */
71#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE / 3)
72
73typedef struct {
74	unsigned long seg;
75} mm_segment_t;
76
77#define MAX_TRAPS 10
78
79struct debug_trap {
80	int nr_trap;
81	unsigned long	addr[MAX_TRAPS];
82	unsigned long	insn[MAX_TRAPS];
83};
84
85struct thread_struct {
86	unsigned long address;
87	unsigned long trap_no;		/* Trap number  */
88	unsigned long error_code;	/* Error code of trap */
89	unsigned long lr;		/* saved pc */
90	unsigned long sp;		/* user stack pointer */
91	struct debug_trap debug_trap;
92};
93
94#define INIT_SP	(sizeof(init_stack) + (unsigned long) &init_stack)
95
96#define INIT_THREAD	{	\
97	.sp = INIT_SP,		\
98}
99
100/*
101 * Do necessary setup to start up a newly executed thread.
102 */
103
104/* User process Backup PSW */
105#define USERPS_BPSW (M32R_PSW_BSM|M32R_PSW_BIE|M32R_PSW_BPM)
106
107#define start_thread(regs, new_pc, new_spu) 				\
108	do {								\
109		regs->psw = (regs->psw | USERPS_BPSW) & 0x0000FFFFUL;	\
110		regs->bpc = new_pc;					\
111		regs->spu = new_spu;					\
112	} while (0)
113
114/* Forward declaration, a strange C thing */
115struct task_struct;
116struct mm_struct;
117
118/* Free all resources held by a thread. */
119extern void release_thread(struct task_struct *);
120
121/* Copy and release all segment info associated with a VM */
122extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
123extern void release_segments(struct mm_struct * mm);
124
125extern unsigned long thread_saved_pc(struct task_struct *);
126
127/* Copy and release all segment info associated with a VM */
128#define copy_segments(p, mm)  do { } while (0)
129#define release_segments(mm)  do { } while (0)
130
131unsigned long get_wchan(struct task_struct *p);
132#define KSTK_EIP(tsk)  ((tsk)->thread.lr)
133#define KSTK_ESP(tsk)  ((tsk)->thread.sp)
134
135#define cpu_relax()	barrier()
136#define cpu_relax_lowlatency() cpu_relax()
137
138#endif /* _ASM_M32R_PROCESSOR_H */
139