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/uaccess.h>
22#include <asm/current.h>
23
24/* Forward declaration, a strange C thing */
25struct task_struct;
26struct mm_struct;
27
28/*
29 * Default implementation of macro that returns current
30 * instruction pointer ("program counter").
31 */
32#define current_text_addr() \
33({ \
34 void *__pc; \
35 asm("mov pc,%0" : "=a"(__pc)); \
36 __pc; \
37})
38
39extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
40
41extern void show_registers(struct pt_regs *regs);
42
43/*
44 * CPU type and hardware bug flags. Kept separately for each CPU.
45 * Members of this structure are referenced in head.S, so think twice
46 * before touching them. [mj]
47 */
48
49struct mn10300_cpuinfo {
50 int type;
51 unsigned long loops_per_jiffy;
52 char hard_math;
53};
54
55extern struct mn10300_cpuinfo boot_cpu_data;
56
57#ifdef CONFIG_SMP
58#if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
59# error Sorry, NR_CPUS should be 2 to 8
60#endif
61extern struct mn10300_cpuinfo cpu_data[];
62#define current_cpu_data cpu_data[smp_processor_id()]
63#else /* CONFIG_SMP */
64#define cpu_data &boot_cpu_data
65#define current_cpu_data boot_cpu_data
66#endif /* CONFIG_SMP */
67
68extern void identify_cpu(struct mn10300_cpuinfo *);
69extern void print_cpu_info(struct mn10300_cpuinfo *);
70extern void dodgy_tsc(void);
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 * - need to discard the frame stacked by the kernel thread invoking the execve
123 * syscall (see RESTORE_ALL macro)
124 */
125static inline void start_thread(struct pt_regs *regs,
126 unsigned long new_pc, unsigned long new_sp)
127{
128 struct thread_info *ti = current_thread_info();
129 struct pt_regs *frame0;
130
131 frame0 = thread_info_to_uregs(ti);
132 frame0->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
133 frame0->pc = new_pc;
134 frame0->sp = new_sp;
135 ti->frame = frame0;
136}
137
138
139/* Free all resources held by a thread. */
140extern void release_thread(struct task_struct *);
141
142/* Prepare to copy thread state - unlazy all lazy status */
143extern void prepare_to_copy(struct task_struct *tsk);
144
145/*
146 * create a kernel thread without removing it from tasklists
147 */
148extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
149
150/*
151 * Return saved PC of a blocked thread.
152 */
153extern unsigned long thread_saved_pc(struct task_struct *tsk);
154
155unsigned long get_wchan(struct task_struct *p);
156
157#define task_pt_regs(task) ((task)->thread.uregs)
158#define KSTK_EIP(task) (task_pt_regs(task)->pc)
159#define KSTK_ESP(task) (task_pt_regs(task)->sp)
160
161#define KSTK_TOP(info) \
162({ \
163 (unsigned long)(info) + THREAD_SIZE; \
164})
165
166#define ARCH_HAS_PREFETCH
167#define ARCH_HAS_PREFETCHW
168
169static inline void prefetch(const void *x)
170{
171#ifdef CONFIG_MN10300_CACHE_ENABLED
172#ifdef CONFIG_MN10300_PROC_MN103E010
173 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
174#else
175 asm volatile ("dcpf (%0)" : : "r"(x));
176#endif
177#endif
178}
179
180static inline void prefetchw(const void *x)
181{
182#ifdef CONFIG_MN10300_CACHE_ENABLED
183#ifdef CONFIG_MN10300_PROC_MN103E010
184 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
185#else
186 asm volatile ("dcpf (%0)" : : "r"(x));
187#endif
188#endif
189}
190
191#endif /* _ASM_PROCESSOR_H */