linux/arch/powerpc/mm/icswx.h
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   1#ifndef _ARCH_POWERPC_MM_ICSWX_H_
   2#define _ARCH_POWERPC_MM_ICSWX_H_
   3
   4/*
   5 *  ICSWX and ACOP Management
   6 *
   7 *  Copyright (C) 2011 Anton Blanchard, IBM Corp. <anton@samba.org>
   8 *
   9 *  This program is free software; you can redistribute it and/or
  10 *  modify it under the terms of the GNU General Public License
  11 *  as published by the Free Software Foundation; either version
  12 *  2 of the License, or (at your option) any later version.
  13 *
  14 */
  15
  16#include <asm/mmu_context.h>
  17
  18/* also used to denote that PIDs are not used */
  19#define COP_PID_NONE 0
  20
  21static inline void sync_cop(void *arg)
  22{
  23        struct mm_struct *mm = arg;
  24
  25        if (mm == current->active_mm)
  26                switch_cop(current->active_mm);
  27}
  28
  29#ifdef CONFIG_PPC_ICSWX_PID
  30extern int get_cop_pid(struct mm_struct *mm);
  31extern int disable_cop_pid(struct mm_struct *mm);
  32extern void free_cop_pid(int free_pid);
  33#else
  34#define get_cop_pid(m) (COP_PID_NONE)
  35#define disable_cop_pid(m) (COP_PID_NONE)
  36#define free_cop_pid(p)
  37#endif
  38
  39/*
  40 * These are implementation bits for architected registers.  If this
  41 * ever becomes architecture the should be moved to reg.h et. al.
  42 */
  43/* UCT is the same bit for Server and Embedded */
  44#define ICSWX_DSI_UCT           0x00004000  /* Unavailable Coprocessor Type */
  45
  46#ifdef CONFIG_PPC_BOOK3E
  47/* Embedded implementation gives us no hints as to what the CT is */
  48#define ICSWX_GET_CT_HINT(x) (-1)
  49#else
  50/* Server implementation contains the CT value in the DSISR */
  51#define ICSWX_DSISR_CTMASK      0x00003f00
  52#define ICSWX_GET_CT_HINT(x)    (((x) & ICSWX_DSISR_CTMASK) >> 8)
  53#endif
  54
  55#define ICSWX_RC_STARTED        0x8     /* The request has been started */
  56#define ICSWX_RC_NOT_IDLE       0x4     /* No coprocessor found idle */
  57#define ICSWX_RC_NOT_FOUND      0x2     /* No coprocessor found */
  58#define ICSWX_RC_UNDEFINED      0x1     /* Reserved */
  59
  60extern int acop_handle_fault(struct pt_regs *regs, unsigned long address,
  61                             unsigned long error_code);
  62#endif /* !_ARCH_POWERPC_MM_ICSWX_H_ */
  63