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processor.h

/*
 * 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
#define STACK_TOP TASK_SIZE

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE    ((TASK_SIZE / 3) & ~(PAGE_SIZE))
#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
#define STACK_TOP \
      (test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE                                  \
      (test_thread_flag(TIF_32BIT_ADDR) ?                   \
            PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
#define TASK_SIZE_OF(tsk)                                   \
      (test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
#endif

#ifdef __KERNEL__
#define STACK_TOP_MAX   TASK_SIZE
#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 NUM_DSP_REGS   6

typedef __u32 dspreg_t;

struct mips_dsp_state {
      dspreg_t        dspr[NUM_DSP_REGS];
      unsigned int    dspcontrol;
};

#define INIT_CPUMASK { \
      {0,} \
}

struct mips3264_watch_reg_state {
      /* The width of watchlo is 32 in a 32 bit kernel and 64 in a
         64 bit kernel.  We use unsigned long as it has the same
         property. */
      unsigned long watchlo[NUM_WATCH_REGS];
      /* Only the mask and IRW bits from watchhi. */
      u16 watchhi[NUM_WATCH_REGS];
};

union mips_watch_reg_state {
      struct mips3264_watch_reg_state mips3264;
};

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;

      /* Saved watch register state, if available. */
      union mips_watch_reg_state watch;

      /* 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;
      unsigned long irix_trampoline;  /* Wheee... */
      unsigned long irix_oldctx;
      struct mips_abi *abi;
};

#ifdef CONFIG_MIPS_MT_FPAFF
#define FPAFF_INIT                                    \
      .emulated_fp                  = 0,              \
      .user_cpus_allowed            = INIT_CPUMASK,
#else
#define FPAFF_INIT
#endif /* CONFIG_MIPS_MT_FPAFF */

#define INIT_THREAD  {                                \
        /*                                      \
         * Saved main processor registers             \
         */                                     \
      .reg16                  = 0,                    \
      .reg17                  = 0,                    \
      .reg18                  = 0,                    \
      .reg19                  = 0,                    \
      .reg20                  = 0,                    \
      .reg21                  = 0,                    \
      .reg22                  = 0,                    \
      .reg23                  = 0,                    \
      .reg29                  = 0,                    \
      .reg30                  = 0,                    \
      .reg31                  = 0,                    \
      /*                                        \
       * Saved cp0 stuff                              \
       */                                       \
      .cp0_status       = 0,                    \
      /*                                        \
       * Saved FPU/FPU emulator stuff                       \
       */                                       \
      .fpu              = {                     \
            .fpr        = {0,},                       \
            .fcr31            = 0,                    \
      },                                        \
      /*                                        \
       * FPU affinity state (null if not FPAFF)       \
       */                                       \
      FPAFF_INIT                                \
      /*                                        \
       * Saved DSP stuff                              \
       */                                       \
      .dsp              = {                     \
            .dspr       = {0, },                \
            .dspcontrol = 0,                    \
      },                                        \
      /*                                        \
       * saved watch register stuff                   \
       */                                       \
      .watch = {{{0,},},},                            \
      /*                                        \
       * Other stuff associated with the process            \
       */                                       \
      .cp0_badvaddr           = 0,                    \
      .cp0_baduaddr           = 0,                    \
      .error_code       = 0,                    \
      .trap_no          = 0,                    \
      .irix_trampoline  = 0,                    \
      .irix_oldctx            = 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

static inline void prefetch(const void *addr)
{
      __asm__ __volatile__(
      "     .set  mips4       \n"
      "     pref  %0, (%1)    \n"
      "     .set  mips0       \n"
      :
      : "i" (Pref_Load), "r" (addr));
}

#endif

#endif /* _ASM_PROCESSOR_H */

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