Linux kernel mirror (for testing)
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1/* MN10300 Processor specifics
2 *
3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public Licence
9 * as published by the Free Software Foundation; either version
10 * 2 of the Licence, or (at your option) any later version.
11 */
12
13#ifndef _ASM_PROCESSOR_H
14#define _ASM_PROCESSOR_H
15
16#include <linux/threads.h>
17#include <linux/thread_info.h>
18#include <asm/page.h>
19#include <asm/ptrace.h>
20#include <asm/cpu-regs.h>
21#include <asm/current.h>
22
23/* Forward declaration, a strange C thing */
24struct task_struct;
25struct mm_struct;
26
27/*
28 * Default implementation of macro that returns current
29 * instruction pointer ("program counter").
30 */
31#define current_text_addr() \
32({ \
33 void *__pc; \
34 asm("mov pc,%0" : "=a"(__pc)); \
35 __pc; \
36})
37
38extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
39
40extern void show_registers(struct pt_regs *regs);
41
42/*
43 * CPU type and hardware bug flags. Kept separately for each CPU.
44 * Members of this structure are referenced in head.S, so think twice
45 * before touching them. [mj]
46 */
47
48struct mn10300_cpuinfo {
49 int type;
50 unsigned long loops_per_jiffy;
51 char hard_math;
52};
53
54extern struct mn10300_cpuinfo boot_cpu_data;
55
56#ifdef CONFIG_SMP
57#if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
58# error Sorry, NR_CPUS should be 2 to 8
59#endif
60extern struct mn10300_cpuinfo cpu_data[];
61#define current_cpu_data cpu_data[smp_processor_id()]
62#else /* CONFIG_SMP */
63#define cpu_data &boot_cpu_data
64#define current_cpu_data boot_cpu_data
65#endif /* CONFIG_SMP */
66
67extern void identify_cpu(struct mn10300_cpuinfo *);
68extern void print_cpu_info(struct mn10300_cpuinfo *);
69extern void dodgy_tsc(void);
70
71#define cpu_relax() barrier()
72
73/*
74 * User space process size: 1.75GB (default).
75 */
76#define TASK_SIZE 0x70000000
77
78/*
79 * Where to put the userspace stack by default
80 */
81#define STACK_TOP 0x70000000
82#define STACK_TOP_MAX STACK_TOP
83
84/* This decides where the kernel will search for a free chunk of vm
85 * space during mmap's.
86 */
87#define TASK_UNMAPPED_BASE 0x30000000
88
89struct fpu_state_struct {
90 unsigned long fs[32]; /* fpu registers */
91 unsigned long fpcr; /* fpu control register */
92};
93
94struct thread_struct {
95 struct pt_regs *uregs; /* userspace register frame */
96 unsigned long pc; /* kernel PC */
97 unsigned long sp; /* kernel SP */
98 unsigned long a3; /* kernel FP */
99 unsigned long wchan;
100 unsigned long usp;
101 unsigned long fpu_flags;
102#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
103#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
104 struct fpu_state_struct fpu_state;
105};
106
107#define INIT_THREAD \
108{ \
109 .uregs = init_uregs, \
110 .pc = 0, \
111 .sp = 0, \
112 .a3 = 0, \
113 .wchan = 0, \
114}
115
116#define INIT_MMAP \
117{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
118 NULL, NULL }
119
120/*
121 * do necessary setup to start up a newly executed thread
122 */
123static inline void start_thread(struct pt_regs *regs,
124 unsigned long new_pc, unsigned long new_sp)
125{
126 regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
127 regs->pc = new_pc;
128 regs->sp = new_sp;
129}
130
131
132/* Free all resources held by a thread. */
133extern void release_thread(struct task_struct *);
134
135unsigned long get_wchan(struct task_struct *p);
136
137#define task_pt_regs(task) ((task)->thread.uregs)
138#define KSTK_EIP(task) (task_pt_regs(task)->pc)
139#define KSTK_ESP(task) (task_pt_regs(task)->sp)
140
141#define KSTK_TOP(info) \
142({ \
143 (unsigned long)(info) + THREAD_SIZE; \
144})
145
146#define ARCH_HAS_PREFETCH
147#define ARCH_HAS_PREFETCHW
148
149static inline void prefetch(const void *x)
150{
151#ifdef CONFIG_MN10300_CACHE_ENABLED
152#ifdef CONFIG_MN10300_PROC_MN103E010
153 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
154#else
155 asm volatile ("dcpf (%0)" : : "r"(x));
156#endif
157#endif
158}
159
160static inline void prefetchw(const void *x)
161{
162#ifdef CONFIG_MN10300_CACHE_ENABLED
163#ifdef CONFIG_MN10300_PROC_MN103E010
164 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
165#else
166 asm volatile ("dcpf (%0)" : : "r"(x));
167#endif
168#endif
169}
170
171#endif /* _ASM_PROCESSOR_H */