/***************************************************************************
 *
 * Copyright (C) 2001 International Business Machines
 * All rights reserved.
 *
 * This file is part of the GPFS mmfslinux kernel module.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer. 
 *  2. Redistributions in binary form must reproduce the above copyright 
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 *  3. The name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written
 *     permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *************************************************************************** */
/* @(#)87       1.26  src/avs/fs/mmfs/ts/kernext/gpl-linux/arch-gpl.h, mmfs, avs_rgpfs24, rgpfs240610b 5/10/05 16:55:12 */
#ifndef _h_arch_gpl
#define _h_arch_gpl

#define LEVEL_1 // uncomment to get privilege level 1 where the storage is
                // NOT accessible by all users ???

#if defined(GPFS_ARCH_IA64) || defined(GPFS_ARCH_PPC64) \
      || defined(GPFS_ARCH_X86_64)
#define PGD_OFFSET(mm, page) pgd_offset_k(page)
#else
#define PGD_OFFSET(mm, page) pgd_offset(mm, page)
#endif

#ifdef GPFS_ARCH_IA64
/* In the kernel's mapped region we have a full 43 bit space available and
   completely ignore the region number (since we know its in region number 5).*/
#ifdef LEVEL_1
#define PRIVILEGE_FLAGS _PAGE_PL_1           // privilege level 1
#else
#define PRIVILEGE_FLAGS _PAGE_PL_3           // privilege level 3(user)
#endif
#else   //GPFS_ARCH_I386
#define PRIVILEGE_FLAGS _PAGE_USER
#endif

int kxSaveThreadInfo(int pid, void* reg);
#ifdef GPFS_ARCH_IA64
int set_privilege_level(unsigned long progLevel);
int get_privilege_level();
#else
#define set_privilege_level(_a) 0
#define get_privilege_level(_a) 0
#endif

#if LINUX_KERNEL_VERSION >= 2050000
#include <asm/tlbflush.h>
#endif

/* General macros for flushing tlb entries */
#if defined(GPFS_ARCH_POWER) || defined(GPFS_ARCH_PPC64) \
      || defined(GPFS_ARCH_X86_64)
#define FLUSH_TLB_PAGE(V,A)            NOOP //???
#define FLUSH_TLB_RANGE(M,S,E)         NOOP //???
#endif
#ifdef GPFS_ARCH_I386
#define FLUSH_TLB_PAGE(V,A)            flush_tlb_page(V,A)
/* Temporary workaround for running i386 Linux distros on EM64T or x86-64
   architecture; we need to flush the tlb on all cpus in this case
   in a rather convoluted manner (vfree) after changing the protection bits.
   This will go away with the use of pointer swizzling on ia32
   in the near future. */
#define FLUSH_TLB_RANGE(M,S,E) \
        {   void *_tptr; \
            _tptr = vmalloc(PAGE_SIZE); \
            vfree(_tptr); \
        }
#define FLUSH_TLB_ALL()
#endif /* GPFS_ARCH_I386 */

#if defined(GPFS_ARCH_IA64)
#define FLUSH_TLB_PAGE(V,A)            flush_tlb_page(V,A)
#if LINUX_KERNEL_VERSION >= 2060500
/* flush_tlb_range now uses vma struct instead of mm struct. */
#define FLUSH_TLB_RANGE(M,S,E) \
        { struct vm_area_struct vma; \
          vma.vm_mm = M; \
          flush_tlb_range(&vma,S,E); \
        }
#else
#define FLUSH_TLB_RANGE(M,S,E)         flush_tlb_range(M,S,E)
#endif /* LINUX_KERNEL_VERSION >= 2060500 */
#define FLUSH_TLB_ALL()                flush_tlb_all()
#endif /* GPFS_ARCH_IA64 */

#endif /* _h_arch_gpl */