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processor_64.h

#ifndef __ASM_SH_PROCESSOR_64_H
#define __ASM_SH_PROCESSOR_64_H

/*
 * include/asm-sh/processor_64.h
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003  Paul Mundt
 * Copyright (C) 2004  Richard Curnow
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#ifndef __ASSEMBLY__

#include <linux/compiler.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/cache.h>
#include <asm/ptrace.h>
#include <cpu/registers.h>

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ \
void *pc; \
unsigned long long __dummy = 0; \
__asm__("gettr    tr0, %1\n\t" \
      "pta  4, tr0\n\t" \
      "gettr      tr0, %0\n\t" \
      "ptabs      %1, tr0\n\t"      \
      :"=r" (pc), "=r" (__dummy) \
      : "1" (__dummy)); \
pc; })

/*
 * TLB information structure
 *
 * Defined for both I and D tlb, per-processor.
 */
struct tlb_info {
      unsigned long long next;
      unsigned long long first;
      unsigned long long last;

      unsigned int entries;
      unsigned int step;

      unsigned long flags;
};

struct sh_cpuinfo {
      enum cpu_type type;
      unsigned long loops_per_jiffy;
      unsigned long asid_cache;

      unsigned int cpu_clock, master_clock, bus_clock, module_clock;

      /* Cache info */
      struct cache_info icache;
      struct cache_info dcache;
      struct cache_info scache;

      /* TLB info */
      struct tlb_info itlb;
      struct tlb_info dtlb;

      unsigned long flags;
};

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()]

#endif

/*
 * User space process size: 2GB - 4k.
 */
#define TASK_SIZE 0x7ffff000UL

#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
 *
 * STEP-bit:
 *     Single step bit
 *
 */
#if defined(CONFIG_SH64_SR_WATCH)
#define SR_MMU   0x84000000
#else
#define SR_MMU   0x80000000
#endif

#define SR_IMASK 0x000000f0
#define SR_FD    0x00008000
#define SR_SSTEP 0x08000000

#ifndef __ASSEMBLY__

/*
 * FPU structure and data : require 8-byte alignment as we need to access it
   with fld.p, fst.p
 */

struct sh_fpu_hard_struct {
      unsigned long fp_regs[64];
      unsigned int fpscr;
      /* long status; * software status information */
};

#if 0
/* Dummy fpu emulator  */
struct sh_fpu_soft_struct {
      unsigned long long fp_regs[32];
      unsigned int fpscr;
      unsigned char lookahead;
      unsigned long entry_pc;
};
#endif

union sh_fpu_union {
      struct sh_fpu_hard_struct hard;
      /* 'hard' itself only produces 32 bit alignment, yet we need
         to access it using 64 bit load/store as well. */
      unsigned long long alignment_dummy;
};

struct thread_struct {
      unsigned long sp;
      unsigned long pc;
      /* This stores the address of the pt_regs built during a context
         switch, or of the register save area built for a kernel mode
         exception.  It is used for backtracing the stack of a sleeping task
         or one that traps in kernel mode. */
        struct pt_regs *kregs;
      /* This stores the address of the pt_regs constructed on entry from
         user mode.  It is a fixed value over the lifetime of a process, or
         NULL for a kernel thread. */
      struct pt_regs *uregs;

      unsigned long trap_no, error_code;
      unsigned long address;
      /* Hardware debugging registers may come here */

      /* floating point info */
      union sh_fpu_union fpu;
};

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

extern  struct pt_regs fake_swapper_regs;

#define INIT_THREAD  {                    \
      .sp         = sizeof(init_stack) +  \
                    (long) &init_stack,   \
      .pc         = 0,              \
        .kregs          = &fake_swapper_regs,   \
      .uregs              = NULL,               \
      .trap_no    = 0,              \
      .error_code = 0,              \
      .address    = 0,              \
      .fpu        = { { { 0, } }, } \
}

/*
 * Do necessary setup to start up a newly executed thread.
 */
#define SR_USER (SR_MMU | SR_FD)

#define start_thread(regs, new_pc, new_sp)                  \
      set_fs(USER_DS);                          \
      regs->sr = SR_USER;     /* User mode. */        \
      regs->pc = new_pc - 4;  /* Compensate syscall exit */ \
      regs->pc |= 1;          /* Set SHmedia ! */           \
      regs->regs[18] = 0;                             \
      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 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)
#define forget_segments()     do { } while (0)
#define prepare_to_copy(tsk)  do { } while (0)
/*
 * FPU lazy state save handling.
 */

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

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

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

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

/* Round to nearest, no exceptions on inexact, overflow, underflow,
   zero-divide, invalid.  Configure option for whether to flush denorms to
   zero, or except if a denorm is encountered.  */
#if defined(CONFIG_SH64_FPU_DENORM_FLUSH)
#define FPSCR_INIT  0x00040000
#else
#define FPSCR_INIT  0x00000000
#endif

#ifdef CONFIG_SH_FPU
/* Initialise the FP state of a task */
void fpinit(struct sh_fpu_hard_struct *fpregs);
#else
#define fpinit(fpregs)  do { } while (0)
#endif

extern struct task_struct *last_task_used_math;

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

#endif      /* __ASSEMBLY__ */
#endif /* __ASM_SH_PROCESSOR_64_H */

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