/*
 * include/asm-sh/processor.h
 *
 * Copyright (C) 1999, 2000  Niibe Yutaka
 * Copyright (C) 2002, 2003  Paul Mundt
 */

#ifndef __ASM_SH_PROCESSOR_32_H
#define __ASM_SH_PROCESSOR_32_H
#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/ptrace.h>

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ void *pc; __asm__("mova  1f, %0\n.align 2\n1:":"=z" (pc)); pc; })

/* Core Processor Version Register */
#define CCN_PVR         0xff000030
#define CCN_CVR         0xff000040
#define CCN_PRR         0xff000044

asmlinkage void __init sh_cpu_init(void);

/*
 * User space process size: 2GB.
 *
 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
 */
#define TASK_SIZE       0x7c000000UL

#define STACK_TOP       TASK_SIZE
#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      (TASK_SIZE / 3)

/*
 * Bit of SR register
 *
 * FD-bit:
 *     When it's set, it means the processor doesn't have right to use FPU,
 *     and it results exception when the floating operation is executed.
 *
 * IMASK-bit:
 *     Interrupt level mask
 */
#define SR_DSP          0x00001000
#define SR_IMASK        0x000000f0
#define SR_FD           0x00008000

/*
 * DSP structure and data
 */
struct sh_dsp_struct {
        unsigned long dsp_regs[14];
        long status;
};

/*
 * FPU structure and data
 */

struct sh_fpu_hard_struct {
        unsigned long fp_regs[16];
        unsigned long xfp_regs[16];
        unsigned long fpscr;
        unsigned long fpul;

        long status; /* software status information */
};

/* Dummy fpu emulator  */
struct sh_fpu_soft_struct {
        unsigned long fp_regs[16];
        unsigned long xfp_regs[16];
        unsigned long fpscr;
        unsigned long fpul;

        unsigned char lookahead;
        unsigned long entry_pc;
};

union sh_fpu_union {
        struct sh_fpu_hard_struct hard;
        struct sh_fpu_soft_struct soft;
};

struct thread_struct {
        /* Saved registers when thread is descheduled */
        unsigned long sp;
        unsigned long pc;

        /* Hardware debugging registers */
        unsigned long ubc_pc;

        /* floating point info */
        union sh_fpu_union fpu;

#ifdef CONFIG_SH_DSP
        /* Dsp status information */
        struct sh_dsp_struct dsp_status;
#endif
};

/* Count of active tasks with UBC settings */
extern int ubc_usercnt;

#define INIT_THREAD  {                                          \
        .sp = sizeof(init_stack) + (long) &init_stack,          \
}

/*
 * Do necessary setup to start up a newly executed thread.
 */
#define start_thread(_regs, new_pc, new_sp)      \
        set_fs(USER_DS);                         \
        _regs->pr = 0;                           \
        _regs->sr = SR_FD;      /* User mode. */ \
        _regs->pc = new_pc;                      \
        _regs->regs[15] = new_sp

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

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

/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk)    do { } while (0)

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

/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm)    do { } while(0)
#define release_segments(mm)    do { } while(0)

/*
 * FPU lazy state save handling.
 */

static __inline__ void disable_fpu(void)
{
        unsigned long __dummy;

        /* Set FD flag in SR */
        __asm__ __volatile__("stc       sr, %0\n\t"
                             "or        %1, %0\n\t"
                             "ldc       %0, sr"
                             : "=&r" (__dummy)
                             : "r" (SR_FD));
}

static __inline__ void enable_fpu(void)
{
        unsigned long __dummy;

        /* Clear out FD flag in SR */
        __asm__ __volatile__("stc       sr, %0\n\t"
                             "and       %1, %0\n\t"
                             "ldc       %0, sr"
                             : "=&r" (__dummy)
                             : "r" (~SR_FD));
}

/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
#define FPSCR_INIT  0x00080000

#define FPSCR_CAUSE_MASK        0x0001f000      /* Cause bits */
#define FPSCR_FLAG_MASK         0x0000007c      /* Flag bits */

/*
 * Return saved PC of a blocked thread.
 */
#define thread_saved_pc(tsk)    (tsk->thread.pc)

void show_trace(struct task_struct *tsk, unsigned long *sp,
                struct pt_regs *regs);

#ifdef CONFIG_DUMP_CODE
void show_code(struct pt_regs *regs);
#else
static inline void show_code(struct pt_regs *regs)
{
}
#endif

extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk)  (task_pt_regs(tsk)->regs[15])

#define user_stack_pointer(_regs)       ((_regs)->regs[15])

#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH4)
#define PREFETCH_STRIDE         L1_CACHE_BYTES
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
static inline void prefetch(void *x)
{
        __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
}

#define prefetchw(x)    prefetch(x)
#endif

#endif /* __KERNEL__ */
#endif /* __ASM_SH_PROCESSOR_32_H */