/* processor.h: FRV processor definitions
*
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/

#ifndef _ASM_PROCESSOR_H
#define _ASM_PROCESSOR_H

#include <asm/mem-layout.h>

#ifndef __ASSEMBLY__
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})

#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/sections.h>
#include <asm/segment.h>
#include <asm/fpu.h>
#include <asm/registers.h>
#include <asm/ptrace.h>
#include <asm/current.h>
#include <asm/cache.h>

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

/*
* CPU type and hardware bug flags. Kept separately for each CPU.
*/
struct cpuinfo_frv {
#ifdef CONFIG_MMU
unsigned long *pgd_quick;
unsigned long *pte_quick;
unsigned long pgtable_cache_sz;
#endif
} __cacheline_aligned;

extern struct cpuinfo_frv __nongprelbss boot_cpu_data;

#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data

/*
* Bus types
*/
#define EISA_bus 0

struct thread_struct {
struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
struct task_struct *curr; /* [GR29] current pointer for this thread */
unsigned long sp; /* [GR1 ] kernel stack pointer */
unsigned long fp; /* [GR2 ] kernel frame pointer */
unsigned long lr; /* link register */
unsigned long pc; /* program counter */
unsigned long gr[12]; /* [GR16-GR27] */
unsigned long sched_lr; /* LR from schedule() */

union {
struct pt_regs *frame0; /* top (user) stack frame */
struct user_context *user; /* userspace context */
};
} __attribute__((aligned(8)));

extern struct pt_regs *__kernel_frame0_ptr;
extern struct task_struct *__kernel_current_task;

#endif

#ifndef __ASSEMBLY__
#define INIT_THREAD_FRAME0 \
((struct pt_regs *) \
(sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))

#define INIT_THREAD { \
NULL, \
(struct task_struct *) init_stack, \
0, 0, 0, 0, \
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
0, \
{ INIT_THREAD_FRAME0 }, \
}

/*
* do necessary setup to start up a newly executed thread.
*/
#define start_thread(_regs, _pc, _usp) \
do { \
_regs->pc = (_pc); \
_regs->psr &= ~PSR_S; \
_regs->sp = (_usp); \
} while(0)

/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}

extern asmlinkage void save_user_regs(struct user_context *target);
extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);

#define copy_segments(tsk, mm) do { } while (0)
#define release_segments(mm) do { } while (0)
#define forget_segments() do { } while (0)

/*
* Free current thread data structures etc..
*/
static inline void exit_thread(void)
{
}

/*
* 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 KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
#define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)

#define cpu_relax() barrier()

/* data cache prefetch */
#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *x)
{
asm volatile("dcpl %0,gr0,#0" : : "r"(x));
}

#endif /* __ASSEMBLY__ */
#endif /* _ASM_PROCESSOR_H */