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David Howellsb920de12008-02-08 04:19:31 -08001/* 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
David Howells7c7fcf72010-10-27 17:29:01 +010016#include <linux/threads.h>
17#include <linux/thread_info.h>
David Howellsb920de12008-02-08 04:19:31 -080018#include <asm/page.h>
19#include <asm/ptrace.h>
20#include <asm/cpu-regs.h>
David Howells7c7fcf72010-10-27 17:29:01 +010021#include <asm/uaccess.h>
22#include <asm/current.h>
David Howellsb920de12008-02-08 04:19:31 -080023
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
Akira Takeuchi368dd5a2010-10-27 17:28:55 +010039extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
40
David Howellsb920de12008-02-08 04:19:31 -080041extern 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;
Akira Takeuchi368dd5a2010-10-27 17:28:55 +010051 unsigned long loops_per_jiffy;
David Howellsb920de12008-02-08 04:19:31 -080052 char hard_math;
David Howellsb920de12008-02-08 04:19:31 -080053};
54
55extern struct mn10300_cpuinfo boot_cpu_data;
56
Akira Takeuchi368dd5a2010-10-27 17:28:55 +010057#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 */
David Howellsb920de12008-02-08 04:19:31 -080064#define cpu_data &boot_cpu_data
65#define current_cpu_data boot_cpu_data
Akira Takeuchi368dd5a2010-10-27 17:28:55 +010066#endif /* CONFIG_SMP */
David Howellsb920de12008-02-08 04:19:31 -080067
68extern void identify_cpu(struct mn10300_cpuinfo *);
69extern void print_cpu_info(struct mn10300_cpuinfo *);
70extern void dodgy_tsc(void);
Davidlohr Bueso3a6bfbc2014-06-29 15:09:33 -070071
David Howells148c69b2008-05-07 15:31:54 +010072#define cpu_relax() barrier()
Davidlohr Bueso3a6bfbc2014-06-29 15:09:33 -070073#define cpu_relax_lowlatency() cpu_relax()
David Howellsb920de12008-02-08 04:19:31 -080074
75/*
76 * User space process size: 1.75GB (default).
77 */
78#define TASK_SIZE 0x70000000
79
80/*
81 * Where to put the userspace stack by default
82 */
83#define STACK_TOP 0x70000000
84#define STACK_TOP_MAX STACK_TOP
85
86/* This decides where the kernel will search for a free chunk of vm
87 * space during mmap's.
88 */
89#define TASK_UNMAPPED_BASE 0x30000000
90
David Howellsb920de12008-02-08 04:19:31 -080091struct fpu_state_struct {
92 unsigned long fs[32]; /* fpu registers */
93 unsigned long fpcr; /* fpu control register */
94};
95
96struct thread_struct {
97 struct pt_regs *uregs; /* userspace register frame */
98 unsigned long pc; /* kernel PC */
99 unsigned long sp; /* kernel SP */
100 unsigned long a3; /* kernel FP */
101 unsigned long wchan;
102 unsigned long usp;
David Howellsb920de12008-02-08 04:19:31 -0800103 unsigned long fpu_flags;
104#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
Akira Takeuchi278d91c2010-10-27 17:28:52 +0100105#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
David Howellsb920de12008-02-08 04:19:31 -0800106 struct fpu_state_struct fpu_state;
107};
108
Akira Takeuchi368dd5a2010-10-27 17:28:55 +0100109#define INIT_THREAD \
110{ \
111 .uregs = init_uregs, \
112 .pc = 0, \
113 .sp = 0, \
114 .a3 = 0, \
115 .wchan = 0, \
David Howellsb920de12008-02-08 04:19:31 -0800116}
117
118#define INIT_MMAP \
119{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
120 NULL, NULL }
121
122/*
123 * do necessary setup to start up a newly executed thread
David Howellsb920de12008-02-08 04:19:31 -0800124 */
David Howells7c7fcf72010-10-27 17:29:01 +0100125static inline void start_thread(struct pt_regs *regs,
126 unsigned long new_pc, unsigned long new_sp)
127{
Al Viro6e754212012-09-19 13:18:20 -0400128 regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
129 regs->pc = new_pc;
130 regs->sp = new_sp;
David Howells7c7fcf72010-10-27 17:29:01 +0100131}
132
David Howellsb920de12008-02-08 04:19:31 -0800133
134/* Free all resources held by a thread. */
135extern void release_thread(struct task_struct *);
136
David Howellsb920de12008-02-08 04:19:31 -0800137/*
David Howellsb920de12008-02-08 04:19:31 -0800138 * Return saved PC of a blocked thread.
139 */
140extern unsigned long thread_saved_pc(struct task_struct *tsk);
141
142unsigned long get_wchan(struct task_struct *p);
143
David Howells5d289962009-06-11 13:08:37 +0100144#define task_pt_regs(task) ((task)->thread.uregs)
David Howellsb920de12008-02-08 04:19:31 -0800145#define KSTK_EIP(task) (task_pt_regs(task)->pc)
146#define KSTK_ESP(task) (task_pt_regs(task)->sp)
147
148#define KSTK_TOP(info) \
149({ \
150 (unsigned long)(info) + THREAD_SIZE; \
151})
152
153#define ARCH_HAS_PREFETCH
154#define ARCH_HAS_PREFETCHW
155
156static inline void prefetch(const void *x)
157{
David Howells344af922010-10-27 17:28:42 +0100158#ifdef CONFIG_MN10300_CACHE_ENABLED
David Howellsb920de12008-02-08 04:19:31 -0800159#ifdef CONFIG_MN10300_PROC_MN103E010
160 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
161#else
162 asm volatile ("dcpf (%0)" : : "r"(x));
163#endif
164#endif
165}
166
167static inline void prefetchw(const void *x)
168{
David Howells344af922010-10-27 17:28:42 +0100169#ifdef CONFIG_MN10300_CACHE_ENABLED
David Howellsb920de12008-02-08 04:19:31 -0800170#ifdef CONFIG_MN10300_PROC_MN103E010
171 asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
172#else
173 asm volatile ("dcpf (%0)" : : "r"(x));
174#endif
175#endif
176}
177
178#endif /* _ASM_PROCESSOR_H */