/arch/mn10300/include/asm/processor.h

  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
 72#define cpu_relax() barrier()
 73#define cpu_relax_lowlatency() cpu_relax()
 74
 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
 91struct 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;
103	unsigned long		fpu_flags;
104#define THREAD_USING_FPU	0x00000001	/* T if this task is using the FPU */
105#define THREAD_HAS_FPU		0x00000002	/* T if this task owns the FPU right now */
106	struct fpu_state_struct	fpu_state;
107};
108
109#define INIT_THREAD		\
110{				\
111	.uregs	= init_uregs,	\
112	.pc	= 0,		\
113	.sp	= 0,		\
114	.a3	= 0,		\
115	.wchan	= 0,		\
116}
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
124 */
125static inline void start_thread(struct pt_regs *regs,
126				unsigned long new_pc, unsigned long new_sp)
127{
128	regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
129	regs->pc = new_pc;
130	regs->sp = new_sp;
131}
132
133
134/* Free all resources held by a thread. */
135extern void release_thread(struct task_struct *);
136
137/*
138 * 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
144#define task_pt_regs(task) ((task)->thread.uregs)
145#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{
158#ifdef CONFIG_MN10300_CACHE_ENABLED
159#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{
169#ifdef CONFIG_MN10300_CACHE_ENABLED
170#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 */