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processor_32.h

/*
 * 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 <asm/page.h>
#include <asm/types.h>
#include <asm/cache.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

struct sh_cpuinfo {
      unsigned int type;
      int cut_major, cut_minor;
      unsigned long loops_per_jiffy;
      unsigned long asid_cache;

      struct cache_info icache;     /* Primary I-cache */
      struct cache_info dcache;     /* Primary D-cache */
      struct cache_info scache;     /* Secondary cache */

      unsigned long flags;
} __attribute__ ((aligned(L1_CACHE_BYTES)));

extern struct sh_cpuinfo cpu_data[];
#define boot_cpu_data cpu_data[0]
#define current_cpu_data cpu_data[smp_processor_id()]
#define raw_current_cpu_data cpu_data[raw_smp_processor_id()]

/*
 * 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

/*
 * 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;
};

/* 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);
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 cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
#define cpu_relax()     barrier()

#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
    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 */

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