[linux-2.6-block.git] / include / asm-mn10300 / processor.h

/* MN10300 Processor specifics
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H

#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/cpu-regs.h>
#include <linux/threads.h>

/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr()			\
({						\
	void *__pc;				\
	asm("mov pc,%0" : "=a"(__pc));		\
	__pc;					\
})

extern void show_registers(struct pt_regs *regs);

/*
 *  CPU type and hardware bug flags. Kept separately for each CPU.
 *  Members of this structure are referenced in head.S, so think twice
 *  before touching them. [mj]
 */

struct mn10300_cpuinfo {
	int		type;
	unsigned long	loops_per_sec;
	char		hard_math;
	unsigned long	*pgd_quick;
	unsigned long	*pte_quick;
	unsigned long	pgtable_cache_sz;
};

extern struct mn10300_cpuinfo boot_cpu_data;

#define cpu_data &boot_cpu_data
#define current_cpu_data boot_cpu_data

extern void identify_cpu(struct mn10300_cpuinfo *);
extern void print_cpu_info(struct mn10300_cpuinfo *);
extern void dodgy_tsc(void);
#define cpu_relax() barrier()

/*
 * User space process size: 1.75GB (default).
 */
#define TASK_SIZE		0x70000000

/*
 * Where to put the userspace stack by default
 */
#define STACK_TOP		0x70000000
#define STACK_TOP_MAX		STACK_TOP

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	0x30000000

typedef struct {
	unsigned long	seg;
} mm_segment_t;

struct fpu_state_struct {
	unsigned long	fs[32];		/* fpu registers */
	unsigned long	fpcr;		/* fpu control register */
};

struct thread_struct {
	struct pt_regs		*uregs;		/* userspace register frame */
	unsigned long		pc;		/* kernel PC */
	unsigned long		sp;		/* kernel SP */
	unsigned long		a3;		/* kernel FP */
	unsigned long		wchan;
	unsigned long		usp;
	struct pt_regs		*__frame;
	unsigned long		fpu_flags;
#define THREAD_USING_FPU	0x00000001	/* T if this task is using the FPU */
	struct fpu_state_struct	fpu_state;
};

#define INIT_THREAD				\
{						\
	.uregs		= init_uregs,		\
	.pc		= 0,			\
	.sp		= 0,			\
	.a3		= 0,			\
	.wchan		= 0,			\
	.__frame	= NULL,			\
}

#define INIT_MMAP \
{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
  NULL, NULL }

/*
 * do necessary setup to start up a newly executed thread
 * - need to discard the frame stacked by the kernel thread invoking the execve
 *   syscall (see RESTORE_ALL macro)
 */
#define start_thread(regs, new_pc, new_sp) do {		\
	set_fs(USER_DS);				\
	__frame = current->thread.uregs;		\
	__frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;	\
	__frame->pc = new_pc;				\
	__frame->sp = new_sp;				\
} while (0)

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct *tsk);

/*
 * create a kernel thread without removing it from tasklists
 */
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

/*
 * Return saved PC of a blocked thread.
 */
extern unsigned long thread_saved_pc(struct task_struct *tsk);

unsigned long get_wchan(struct task_struct *p);

#define task_pt_regs(task)						\
({									\
       struct pt_regs *__regs__;					\
       __regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
       __regs__ - 1;							\
})

#define KSTK_EIP(task) (task_pt_regs(task)->pc)
#define KSTK_ESP(task) (task_pt_regs(task)->sp)

#define KSTK_TOP(info)				\
({						\
	(unsigned long)(info) + THREAD_SIZE;	\
})

#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW

static inline void prefetch(const void *x)
{
#ifndef CONFIG_MN10300_CACHE_DISABLED
#ifdef CONFIG_MN10300_PROC_MN103E010
	asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
#else
	asm volatile ("dcpf (%0)" : : "r"(x));
#endif
#endif
}

static inline void prefetchw(const void *x)
{
#ifndef CONFIG_MN10300_CACHE_DISABLED
#ifdef CONFIG_MN10300_PROC_MN103E010
	asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
#else
	asm volatile ("dcpf (%0)" : : "r"(x));
#endif
#endif
}

#endif /* _ASM_PROCESSOR_H */
Commit	Line	Data
b920de1b DH	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 <asm/page.h>
	17	#include <asm/ptrace.h>
	18	#include <asm/cpu-regs.h>
	19	#include <linux/threads.h>
	20
	21	/* Forward declaration, a strange C thing */
	22	struct task_struct;
	23	struct mm_struct;
	24
	25	/*
	26	* Default implementation of macro that returns current
	27	* instruction pointer ("program counter").
	28	*/
	29	#define current_text_addr() \
	30	({ \
	31	void *__pc; \
	32	asm("mov pc,%0" : "=a"(__pc)); \
	33	__pc; \
	34	})
	35
	36	extern void show_registers(struct pt_regs *regs);
	37
	38	/*
	39	* CPU type and hardware bug flags. Kept separately for each CPU.
	40	* Members of this structure are referenced in head.S, so think twice
	41	* before touching them. [mj]
	42	*/
	43
	44	struct mn10300_cpuinfo {
	45	int type;
	46	unsigned long loops_per_sec;
	47	char hard_math;
	48	unsigned long *pgd_quick;
	49	unsigned long *pte_quick;
	50	unsigned long pgtable_cache_sz;
	51	};
	52
	53	extern struct mn10300_cpuinfo boot_cpu_data;
	54
	55	#define cpu_data &boot_cpu_data
	56	#define current_cpu_data boot_cpu_data
	57
	58	extern void identify_cpu(struct mn10300_cpuinfo *);
	59	extern void print_cpu_info(struct mn10300_cpuinfo *);
	60	extern void dodgy_tsc(void);
148c69b4	61	#define cpu_relax() barrier()
b920de1b DH	62
	63	/*
	64	* User space process size: 1.75GB (default).
	65	*/
	66	#define TASK_SIZE 0x70000000
	67
	68	/*
	69	* Where to put the userspace stack by default
	70	*/
	71	#define STACK_TOP 0x70000000
	72	#define STACK_TOP_MAX STACK_TOP
	73
	74	/* This decides where the kernel will search for a free chunk of vm
	75	* space during mmap's.
	76	*/
	77	#define TASK_UNMAPPED_BASE 0x30000000
	78
	79	typedef struct {
	80	unsigned long seg;
	81	} mm_segment_t;
	82
	83	struct fpu_state_struct {
	84	unsigned long fs[32]; /* fpu registers */
	85	unsigned long fpcr; /* fpu control register */
	86	};
	87
	88	struct thread_struct {
	89	struct pt_regs uregs; / userspace register frame */
	90	unsigned long pc; /* kernel PC */
	91	unsigned long sp; /* kernel SP */
	92	unsigned long a3; /* kernel FP */
	93	unsigned long wchan;
	94	unsigned long usp;
	95	struct pt_regs *__frame;
	96	unsigned long fpu_flags;
	97	#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
	98	struct fpu_state_struct fpu_state;
	99	};
	100
	101	#define INIT_THREAD \
	102	{ \
	103	.uregs = init_uregs, \
	104	.pc = 0, \
	105	.sp = 0, \
	106	.a3 = 0, \
	107	.wchan = 0, \
	108	.__frame = NULL, \
	109	}
	110
	111	#define INIT_MMAP \
	112	{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ \| VM_WRITE \| VM_EXEC, 1, \
	113	NULL, NULL }
	114
	115	/*
	116	* do necessary setup to start up a newly executed thread
	117	* - need to discard the frame stacked by the kernel thread invoking the execve
	118	* syscall (see RESTORE_ALL macro)
	119	*/
	120	#define start_thread(regs, new_pc, new_sp) do { \
	121	set_fs(USER_DS); \
	122	__frame = current->thread.uregs; \
	123	__frame->epsw = EPSW_nSL \| EPSW_IE \| EPSW_IM; \
	124	__frame->pc = new_pc; \
	125	__frame->sp = new_sp; \
126	} while (0)
127
128	/* Free all resources held by a thread. */
129	extern void release_thread(struct task_struct *);
130
131	/* Prepare to copy thread state - unlazy all lazy status */
132	extern void prepare_to_copy(struct task_struct *tsk);
133
134	/*
135	* create a kernel thread without removing it from tasklists
136	*/
137	extern int kernel_thread(int (fn)(void ), void *arg, unsigned long flags);
138
139	/*
140	* Return saved PC of a blocked thread.
141	*/
142	extern unsigned long thread_saved_pc(struct task_struct *tsk);
143
144	unsigned long get_wchan(struct task_struct *p);
145
146	#define task_pt_regs(task) \
147	({ \
148	struct pt_regs *__regs__; \
149	__regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
150	__regs__ - 1; \
151	})
152
153	#define KSTK_EIP(task) (task_pt_regs(task)->pc)
154	#define KSTK_ESP(task) (task_pt_regs(task)->sp)
155
156	#define KSTK_TOP(info) \
157	({ \
158	(unsigned long)(info) + THREAD_SIZE; \
159	})
160
161	#define ARCH_HAS_PREFETCH
162	#define ARCH_HAS_PREFETCHW
163
164	static inline void prefetch(const void *x)
165	{
166	#ifndef CONFIG_MN10300_CACHE_DISABLED
167	#ifdef CONFIG_MN10300_PROC_MN103E010
168	asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
169	#else
170	asm volatile ("dcpf (%0)" : : "r"(x));
171	#endif
172	#endif
173	}
174
175	static inline void prefetchw(const void *x)
176	{
177	#ifndef CONFIG_MN10300_CACHE_DISABLED
178	#ifdef CONFIG_MN10300_PROC_MN103E010
179	asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
180	#else
181	asm volatile ("dcpf (%0)" : : "r"(x));
182	#endif
183	#endif
184	}
185
186	#endif /* _ASM_PROCESSOR_H */