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Annotation of XNU/osfmk/i386/AT386/himem.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_FREE_COPYRIGHT@
        !            24:  */
        !            25: /*
        !            26:  * HISTORY
        !            27:  * 
        !            28:  * Revision 1.1.1.1  1998/09/22 21:05:38  wsanchez
        !            29:  * Import of Mac OS X kernel (~semeria)
        !            30:  *
        !            31:  * Revision 1.1.1.1  1998/03/07 02:25:39  wsanchez
        !            32:  * Import of OSF Mach kernel (~mburg)
        !            33:  *
        !            34:  * Revision 1.3.11.4  1995/12/15  10:49:49  bernadat
        !            35:  *     cbus includes moved to busses/cbus
        !            36:  *     [95/12/15            bernadat]
        !            37:  *
        !            38:  * Revision 1.3.11.3  1995/08/21  20:33:23  devrcs
        !            39:  *     ri-osc CR1547:  Fix himem buffer translation to cope with non
        !            40:  *     page-aligned addresses.
        !            41:  *     [1995/08/08  16:52:06  bolinger]
        !            42:  * 
        !            43:  * Revision 1.3.11.2  1995/01/26  22:14:56  ezf
        !            44:  *     removed extraneous CMU CR
        !            45:  *     [1995/01/26  20:24:48  ezf]
        !            46:  * 
        !            47:  * Revision 1.3.9.2  1994/06/08  21:14:27  dswartz
        !            48:  *     Preemption merge.
        !            49:  *     [1994/06/08  21:12:31  dswartz]
        !            50:  * 
        !            51:  * Revision 1.3.9.1  1994/05/19  20:30:30  dwm
        !            52:  *     mk6 CR 80.  Add himem_init prototype.
        !            53:  *     [1994/05/19  20:30:10  dwm]
        !            54:  * 
        !            55:  * Revision 1.3.2.3  1993/08/09  19:37:21  dswartz
        !            56:  *     Add ANSI prototypes - CR#9523
        !            57:  *     [1993/08/06  17:50:06  dswartz]
        !            58:  * 
        !            59:  * Revision 1.3.2.2  1993/06/09  02:25:24  gm
        !            60:  *     CR9176 - ANSI C violations: trailing tokens on CPP
        !            61:  *     directives, extra semicolons after decl_ ..., asm keywords
        !            62:  *     [1993/06/07  18:58:40  jeffc]
        !            63:  * 
        !            64:  *     Added to OSF/1 R1.3 from NMK15.0.
        !            65:  *     [1993/06/02  21:01:57  jeffc]
        !            66:  * 
        !            67:  * Revision 1.3  1993/04/19  16:09:54  devrcs
        !            68:  *     Use free copyright
        !            69:  *     [1993/03/03  12:12:12  bernadat]
        !            70:  * 
        !            71:  * Revision 1.2  1992/11/25  01:07:16  robert
        !            72:  *     integrate changes below for norma_14
        !            73:  *     [1992/11/13  19:28:57  robert]
        !            74:  * 
        !            75:  * $EndLog$
        !            76:  */
        !            77: 
        !            78: #ifndef _I386AT_HIMEM_H_
        !            79: #define _I386AT_HIMEM_H_
        !            80: 
        !            81: /*
        !            82:  * support of memory above 16 Megs for DMA limited to memory
        !            83:  * below 16 Megs.
        !            84:  */
        !            85: 
        !            86: #include <platforms.h>
        !            87: 
        !            88: #define HIMEM_STATS 0
        !            89: 
        !            90: #if    HIMEM_STATS
        !            91: extern int himem_request;
        !            92: extern int himem_used;
        !            93: #endif /* HIMEM_STATS */
        !            94: 
        !            95: struct himem_link {
        !            96:        struct himem_link *next;
        !            97:        vm_offset_t     high_addr;      /* physical address */
        !            98:        vm_offset_t     low_page;       /* physical page */
        !            99:        vm_offset_t offset;             /* offset on page */
        !           100:        vm_size_t       length;
        !           101: };
        !           102:  
        !           103: typedef struct himem_link *hil_t;      
        !           104: 
        !           105: 
        !           106: #define HIGH_MEM               ((vm_offset_t) 0xf00000)
        !           107: 
        !           108: #define _high_mem_page(x)      ((vm_offset_t)(x) >= HIGH_MEM)
        !           109: 
        !           110: 
        !           111: #if    HIMEM_STATS
        !           112: #define high_mem_page(x) \
        !           113:        (++himem_request && _high_mem_page(x) && ++himem_used)
        !           114: 
        !           115: #else  /* HIMEM_STATS */
        !           116: #define high_mem_page(x)       _high_mem_page(x)
        !           117: #endif /* HIMEM_STATS */
        !           118: 
        !           119: extern void            himem_init(void);
        !           120: extern void            himem_reserve(
        !           121:                                int             npages);
        !           122: extern vm_offset_t     himem_convert(
        !           123:                                vm_offset_t     paddr,
        !           124:                                vm_size_t       len,
        !           125:                                int             op,
        !           126:                                hil_t           * hil);
        !           127: extern void            himem_revert(
        !           128:                                hil_t           hil);
        !           129: 
        !           130: #endif /* _I386AT_HIMEM_H_ */

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