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/*

 * include/asm-sh/processor.h

 *

 * Copyright (C) 1999, 2000  Niibe Yutaka

 */

#ifndef __ASM_SH_PROCESSOR_H

#define __ASM_SH_PROCESSOR_H

#include <asm/page.h>

#include <asm/types.h>

#include <linux/threads.h>

/*

 * Default implementation of macro that returns current

 * instruction pointer ("program counter").

 */

#define current_text_addr() ({ void *pc; __asm__("mova  1f, %0\n1:":"=z" (pc)); pc; })

/*

 *  CPU type and hardware bug flags. Kept separately for each CPU.

 */

enum cpu_type {

        CPU_SH7708,             /* Represents 7707, 7708, 7708S, 7708R, 7709 */

        CPU_SH7729,             /* Represents 7709A, 7729 */

        CPU_SH7750,             /* Represents 7750, 7751 */

        CPU_ST40,               /* Represents ST40STB1 and ST40GX1 */

        CPU_SH4202,

        CPU_SH_NONE

};

struct sh_cpuinfo {

        enum cpu_type type;

        char    hard_math;

        unsigned long loops_per_jiffy;

        unsigned int cpu_clock, master_clock, bus_clock, module_clock;

#ifdef CONFIG_CPU_SUBTYPE_ST40

        unsigned int memory_clock;

#endif

};

extern struct sh_cpuinfo boot_cpu_data;

#define cpu_data (&boot_cpu_data)

#define current_cpu_data boot_cpu_data

/*

 * User space process size: 2GB.

 *

 * Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff

 */

#define TASK_SIZE       0x7c000000UL

/* 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_FD    0x00008000

#define SR_DSP   0x00001000

#define SR_IMASK 0x000000f0

/*

 * 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 {

        unsigned long sp;

        unsigned long pc;

        unsigned long trap_no, error_code;

        unsigned long address;

        /* Hardware debugging registers */

        unsigned long ubc_pc1, ubc_pc2;

        /* floating point info */

        union sh_fpu_union fpu;

};

/* Count of active tasks with UBC settings */

extern int ubc_usercnt;

#define INIT_THREAD  {                                          \

        sizeof(init_stack) + (long) &init_stack, /* sp */       \

        0,                                        /* pc */       \

        0, 0,                                                     \

        0,                                                       \

        0, -1,                                                   \

        {{{0,}},}                                /* fpu state */ \

}

/*

 * 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 = 0;            /* 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 *);

/*

 * create a kernel thread without removing it from tasklists

 */

extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

/*

 * Bus types

 */

#define EISA_bus 0

#define EISA_bus__is_a_macro /* for versions in ksyms.c */

#define MCA_bus 0

#define MCA_bus__is_a_macro /* for versions in ksyms.c */

/* 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 release_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 grab_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));

}

extern void save_fpu(struct task_struct *__tsk);

#define unlazy_fpu(tsk) do {                    \

        if ((tsk)->flags & PF_USEDFPU) {        \

                save_fpu(tsk);                  \

        }                                       \

} while (0)

#define clear_fpu(tsk) do {                     \

        if ((tsk)->flags & PF_USEDFPU) {        \

                (tsk)->flags &= ~PF_USEDFPU;    \

                release_fpu();                  \

        }                                       \

} while (0)

/* 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.

 */

static __inline__ unsigned long thread_saved_pc(struct thread_struct *t)

{

        return t->pc;

}

extern unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  ((tsk)->thread.pc)

#define KSTK_ESP(tsk)  ((tsk)->thread.sp)

#define THREAD_SIZE (2*PAGE_SIZE)

extern struct task_struct * alloc_task_struct(void);

extern void free_task_struct(struct task_struct *);

#define get_task_struct(tsk)      atomic_inc(&virt_to_page(tsk)->count)

#define init_task       (init_task_union.task)

#define init_stack      (init_task_union.stack)

#define cpu_relax()     do { } while (0)

#endif /* __ASM_SH_PROCESSOR_H */