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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/* This decides where the kernel will search for a free chunk of vm
64 * space during mmap's.
65 */
66#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
67
68typedef struct {
69 unsigned long seg;
70} mm_segment_t;
71
72#define MAX_TRAPS 10
73
74struct debug_trap {
75 int nr_trap;
76 unsigned long addr[MAX_TRAPS];
77 unsigned long insn[MAX_TRAPS];
78};
79
80struct thread_struct {
81 unsigned long address;
82 unsigned long trap_no; /* Trap number */
83 unsigned long error_code; /* Error code of trap */
84 unsigned long lr; /* saved pc */
85 unsigned long sp; /* user stack pointer */
86 struct debug_trap debug_trap;
87};
88
89#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
90
91#define INIT_THREAD { \
92 .sp = INIT_SP, \
93}
94
95/*
96 * Do necessary setup to start up a newly executed thread.
97 */
98
99/* User process Backup PSW */
100#define USERPS_BPSW (M32R_PSW_BSM|M32R_PSW_BIE|M32R_PSW_BPM)
101
102#define start_thread(regs, new_pc, new_spu) \
103 do { \
104 set_fs(USER_DS); \
105 regs->psw = (regs->psw | USERPS_BPSW) & 0x0000FFFFUL; \
106 regs->bpc = new_pc; \
107 regs->spu = new_spu; \
108 } while (0)
109
110/* Forward declaration, a strange C thing */
111struct task_struct;
112struct mm_struct;
113
114/* Free all resources held by a thread. */
115extern void release_thread(struct task_struct *);
116
117#define prepare_to_copy(tsk) do { } while (0)
118
119/*
120 * create a kernel thread without removing it from tasklists
121 */
122extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
123
124/* Copy and release all segment info associated with a VM */
125extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
126extern void release_segments(struct mm_struct * mm);
127
128extern unsigned long thread_saved_pc(struct task_struct *);
129
130/* Copy and release all segment info associated with a VM */
131#define copy_segments(p, mm) do { } while (0)
132#define release_segments(mm) do { } while (0)
133
134unsigned long get_wchan(struct task_struct *p);
135#define KSTK_EIP(tsk) ((tsk)->thread.lr)
136#define KSTK_ESP(tsk) ((tsk)->thread.sp)
137
138#define THREAD_SIZE (2*PAGE_SIZE)
139
140#define cpu_relax() barrier()
141
142#endif /* _ASM_M32R_PROCESSOR_H */