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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 <linux/config.h>
18#include <asm/cache.h>
19#include <asm/ptrace.h> /* pt_regs */
20
21/*
22 * Default implementation of macro that returns current
23 * instruction pointer ("program counter").
24 */
25#define current_text_addr() ({ __label__ _l; _l: &&_l; })
26
27/*
28 * CPU type and hardware bug flags. Kept separately for each CPU.
29 * Members of this structure are referenced in head.S, so think twice
30 * before touching them. [mj]
31 */
32
33struct cpuinfo_m32r {
34 unsigned long pgtable_cache_sz;
35 unsigned long cpu_clock;
36 unsigned long bus_clock;
37 unsigned long timer_divide;
38 unsigned long loops_per_jiffy;
39};
40
41/*
42 * capabilities of CPUs
43 */
44
45extern struct cpuinfo_m32r boot_cpu_data;
46
47#ifdef CONFIG_SMP
48extern struct cpuinfo_m32r cpu_data[];
49#define current_cpu_data cpu_data[smp_processor_id()]
50#else
51#define cpu_data (&boot_cpu_data)
52#define current_cpu_data boot_cpu_data
53#endif
54
55/*
56 * User space process size: 2GB (default).
57 */
58#ifdef CONFIG_MMU
59#define TASK_SIZE (0x80000000UL)
60#else
61#define TASK_SIZE (0x00400000UL)
62#endif
63
64/* This decides where the kernel will search for a free chunk of vm
65 * space during mmap's.
66 */
67#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
68
69typedef struct {
70 unsigned long seg;
71} mm_segment_t;
72
73#define MAX_TRAPS 10
74
75struct debug_trap {
76 int nr_trap;
77 unsigned long addr[MAX_TRAPS];
78 unsigned long insn[MAX_TRAPS];
79};
80
81struct thread_struct {
82 unsigned long address;
83 unsigned long trap_no; /* Trap number */
84 unsigned long error_code; /* Error code of trap */
85 unsigned long lr; /* saved pc */
86 unsigned long sp; /* user stack pointer */
87 struct debug_trap debug_trap;
88};
89
90#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
91
92#define INIT_THREAD { \
93 .sp = INIT_SP, \
94}
95
96/*
97 * Do necessary setup to start up a newly executed thread.
98 */
99
100/* User process Backup PSW */
101#define USERPS_BPSW (M32R_PSW_BSM|M32R_PSW_BIE|M32R_PSW_BPM)
102
103#define start_thread(regs, new_pc, new_spu) \
104 do { \
105 set_fs(USER_DS); \
106 regs->psw = (regs->psw | USERPS_BPSW) & 0x0000FFFFUL; \
107 regs->bpc = new_pc; \
108 regs->spu = new_spu; \
109 } while (0)
110
111/* Forward declaration, a strange C thing */
112struct task_struct;
113struct mm_struct;
114
115/* Free all resources held by a thread. */
116extern void release_thread(struct task_struct *);
117
118#define prepare_to_copy(tsk) do { } while (0)
119
120/*
121 * create a kernel thread without removing it from tasklists
122 */
123extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
124
125/* Copy and release all segment info associated with a VM */
126extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
127extern void release_segments(struct mm_struct * mm);
128
129extern unsigned long thread_saved_pc(struct task_struct *);
130
131/* Copy and release all segment info associated with a VM */
132#define copy_segments(p, mm) do { } while (0)
133#define release_segments(mm) do { } while (0)
134
135unsigned long get_wchan(struct task_struct *p);
136#define KSTK_EIP(tsk) ((tsk)->thread.lr)
137#define KSTK_ESP(tsk) ((tsk)->thread.sp)
138
139#define THREAD_SIZE (2*PAGE_SIZE)
140
141#define cpu_relax() barrier()
142
143#endif /* _ASM_M32R_PROCESSOR_H */