/*
   * 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.
   *
   * Copyright (C) 1994 Waldorf GMBH
   * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
   * Copyright (C) 1996 Paul M. Antoine
   * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   */
  #ifndef _ASM_PROCESSOR_H
  #define _ASM_PROCESSOR_H

  #include <linux/cpumask.h>

  #include <linux/threads.h>
  
  #include <asm/cachectl.h>
  #include <asm/cpu.h>
  #include <asm/cpu-info.h>
  #include <asm/mipsregs.h>
  #include <asm/prefetch.h>
  #include <asm/system.h>
  
  /*
   * Return current * instruction pointer ("program counter").
   */
  #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  
  /*
   * System setup and hardware flags..
   */
  extern void (*cpu_wait)(void);
  
  extern unsigned int vced_count, vcei_count;

  #ifdef CONFIG_32BIT

  /*
   * User space process size: 2GB. This is hardcoded into a few places,
   * so don't change it unless you know what you are doing.
   */
  #define TASK_SIZE	0x7fff8000UL
  
  /*
   * This decides where the kernel will search for a free chunk of vm
   * space during mmap's.
   */
  #define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 3))
  #endif

  #ifdef CONFIG_64BIT

  /*
   * User space process size: 1TB. This is hardcoded into a few places,
   * so don't change it unless you know what you are doing.  TASK_SIZE
   * is limited to 1TB by the R4000 architecture; R10000 and better can
   * support 16TB; the architectural reserve for future expansion is
   * 8192EB ...
   */
  #define TASK_SIZE32	0x7fff8000UL
  #define TASK_SIZE	0x10000000000UL
  
  /*
   * This decides where the kernel will search for a free chunk of vm
   * space during mmap's.
   */
  #define TASK_UNMAPPED_BASE	((current->thread.mflags & MF_32BIT_ADDR) ? \
  	PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
  #endif
  
  #define NUM_FPU_REGS	32
  
  typedef __u64 fpureg_t;

  /*
   * It would be nice to add some more fields for emulator statistics, but there
   * are a number of fixed offsets in offset.h and elsewhere that would have to
   * be recalculated by hand.  So the additional information will be private to
   * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
   */

  struct mips_fpu_struct {

  	fpureg_t	fpr[NUM_FPU_REGS];
  	unsigned int	fcr31;
  };

  #define INIT_FPU { \

  	{0,} \

  }

  #define NUM_DSP_REGS   6
  
  typedef __u32 dspreg_t;
  
  struct mips_dsp_state {
  	dspreg_t        dspr[NUM_DSP_REGS];
  	unsigned int    dspcontrol;

  };
  
  #define INIT_DSP {{0,},}

  #define INIT_CPUMASK { \
  	{0,} \
  }

  typedef struct {
  	unsigned long seg;
  } mm_segment_t;
  
  #define ARCH_MIN_TASKALIGN	8

  struct mips_abi;

  /*
   * If you change thread_struct remember to change the #defines below too!
   */
  struct thread_struct {
  	/* Saved main processor registers. */
  	unsigned long reg16;
  	unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
  	unsigned long reg29, reg30, reg31;
  
  	/* Saved cp0 stuff. */
  	unsigned long cp0_status;
  
  	/* Saved fpu/fpu emulator stuff. */

  	struct mips_fpu_struct fpu;

  #ifdef CONFIG_MIPS_MT_FPAFF
  	/* Emulated instruction count */
  	unsigned long emulated_fp;
  	/* Saved per-thread scheduler affinity mask */
  	cpumask_t user_cpus_allowed;
  #endif /* CONFIG_MIPS_MT_FPAFF */

  	/* Saved state of the DSP ASE, if available. */
  	struct mips_dsp_state dsp;

  	/* Other stuff associated with the thread. */
  	unsigned long cp0_badvaddr;	/* Last user fault */
  	unsigned long cp0_baduaddr;	/* Last kernel fault accessing USEG */
  	unsigned long error_code;
  	unsigned long trap_no;
  #define MF_FIXADE	1		/* Fix address errors in software */
  #define MF_LOGADE	2		/* Log address errors to syslog */
  #define MF_32BIT_REGS	4		/* also implies 16/32 fprs */
  #define MF_32BIT_ADDR	8		/* 32-bit address space (o32/n32) */

  #define MF_FPUBOUND	0x10		/* thread bound to FPU-full CPU set */

  	unsigned long mflags;
  	unsigned long irix_trampoline;  /* Wheee... */
  	unsigned long irix_oldctx;

  	struct mips_abi *abi;

  };
  
  #define MF_ABI_MASK	(MF_32BIT_REGS | MF_32BIT_ADDR)
  #define MF_O32		(MF_32BIT_REGS | MF_32BIT_ADDR)
  #define MF_N32		MF_32BIT_ADDR
  #define MF_N64		0

  #ifdef CONFIG_MIPS_MT_FPAFF
  #define FPAFF_INIT 0, INIT_CPUMASK,
  #else
  #define FPAFF_INIT
  #endif /* CONFIG_MIPS_MT_FPAFF */

  #define INIT_THREAD  { \
          /* \
           * saved main processor registers \
           */ \
  	0, 0, 0, 0, 0, 0, 0, 0, \
  	               0, 0, 0, \
  	/* \
  	 * saved cp0 stuff \
  	 */ \
  	0, \
  	/* \
  	 * saved fpu/fpu emulator stuff \
  	 */ \
  	INIT_FPU, \
  	/* \

  	 * fpu affinity state (null if not FPAFF) \
  	 */ \
  	FPAFF_INIT \
  	/* \

  	 * saved dsp/dsp emulator stuff \
  	 */ \
  	INIT_DSP, \
  	/* \

  	 * Other stuff associated with the process \
  	 */ \
  	0, 0, 0, 0, \
  	/* \
  	 * For now the default is to fix address errors \
  	 */ \
  	MF_FIXADE, 0, 0 \
  }
  
  struct task_struct;
  
  /* Free all resources held by a thread. */
  #define release_thread(thread) do { } while(0)
  
  /* Prepare to copy thread state - unlazy all lazy status */
  #define prepare_to_copy(tsk)	do { } while (0)
  
  extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  
  extern unsigned long thread_saved_pc(struct task_struct *tsk);
  
  /*
   * Do necessary setup to start up a newly executed thread.
   */
  extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
  
  unsigned long get_wchan(struct task_struct *p);

  #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32)

  #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1)
  #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc)
  #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29])
  #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status)

  
  #define cpu_relax()	barrier()
  
  /*
   * Return_address is a replacement for __builtin_return_address(count)
   * which on certain architectures cannot reasonably be implemented in GCC
   * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
   * Note that __builtin_return_address(x>=1) is forbidden because GCC
   * aborts compilation on some CPUs.  It's simply not possible to unwind
   * some CPU's stackframes.
   *
   * __builtin_return_address works only for non-leaf functions.  We avoid the
   * overhead of a function call by forcing the compiler to save the return
   * address register on the stack.
   */
  #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
  
  #ifdef CONFIG_CPU_HAS_PREFETCH
  
  #define ARCH_HAS_PREFETCH
  
  extern inline void prefetch(const void *addr)
  {
  	__asm__ __volatile__(
  	"	.set	mips4		
  "
  	"	pref	%0, (%1)	
  "
  	"	.set	mips0		
  "
  	:
  	: "i" (Pref_Load), "r" (addr));
  }
  
  #endif
  
  #endif /* _ASM_PROCESSOR_H */