Subversion Repositories HelenOS

/*

 * Copyright (c) 2007 Pavel Jancik, Michal Kebrt

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - 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.

 * - 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.

 */

/** @addtogroup arm32  

 * @{

 */

/** @file

 */

#ifndef KERN_arm32_TYPES_H_

#define KERN_arm32_TYPES_H_

#define NULL 0

#define false 0

#define true 1

typedef signed char int8_t;

typedef signed short int16_t;

typedef signed long int32_t;

typedef signed long long int64_t;

typedef unsigned char uint8_t;

typedef unsigned short uint16_t;

typedef unsigned long uint32_t;

typedef unsigned long long uint64_t;

typedef uint32_t size_t;

typedef uint32_t count_t;

typedef uint32_t index_t;

typedef uint32_t uintptr_t;

typedef uint32_t pfn_t;

typedef uint32_t ipl_t;

typedef uint32_t unative_t;

typedef int32_t native_t;

typedef uint8_t bool;

typedef uint64_t task_id_t;

typedef uint32_t context_id_t;

typedef int32_t inr_t;

typedef int32_t devno_t;

/** Page table entry.

 *  

 *  We have different structs for level 0 and level 1 page table entries.

 * */

typedef struct {

  unsigned dummy : 32;

} pte_t;

/** Level 0 page table entry. */

typedef struct {

    /* 01b for coarse tables, see below for details */

    unsigned descriptor_type     : 2;

    unsigned impl_specific       : 3;

    unsigned domain              : 4;

    unsigned should_be_zero      : 1;

    /* Pointer to the coarse 2nd level page table (holding entries for small (4KB)

     * or large (64KB) pages. ARM also supports fine 2nd level page tables that

     * may hold even tiny pages (1KB) but they are bigger (4KB per table in comparison

     * with 1KB per the coarse table)

    */

    unsigned coarse_table_addr   : 22;

} __attribute__ ((packed)) pte_level0_t;

/** Level 1 page table entry (small (4KB) pages used) */

typedef struct {

    /* 0b10 for small pages */

    unsigned descriptor_type     : 2;

    unsigned bufferable          : 1;

    unsigned cacheable           : 1;

    /* access permissions for each of 4 subparts of a page

     * (for each 1KB when small pages used */

    unsigned access_permission_0 : 2;

    unsigned access_permission_1 : 2;

    unsigned access_permission_2 : 2;

    unsigned access_permission_3 : 2;

    unsigned frame_base_addr     : 20;

} __attribute__ ((packed)) pte_level1_t;

/* Level 1 page tables access permissions */

/** User mode: no access, privileged mode: no access */

#define PTE_AP_USER_NO_KERNEL_NO 0

/** User mode: no access, privileged mode: read/write */

#define PTE_AP_USER_NO_KERNEL_RW 1

/** User mode: read only, privileged mode: read/write */

#define PTE_AP_USER_RO_KERNEL_RW 2

/// User mode: read/write, privileged mode: read/write

#define PTE_AP_USER_RW_KERNEL_RW 3

/* pte_level0_t and pte_level1_t descriptor_type flags */

/** pte_level0_t and pte_level1_t "not present" flag (used in descriptor_type) */

#define PTE_DESCRIPTOR_NOT_PRESENT  0 

/** pte_level0_t coarse page table flag (used in descriptor_type) */

#define PTE_DESCRIPTOR_COARSE_TABLE 1

/** pte_level1_t small page table flag (used in descriptor type) */

#define PTE_DESCRIPTOR_SMALL_PAGE   2

#endif

/** @}

 */