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Annotation of 43BSDTahoe/sys/tahoevba/vbaparam.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)vbaparam.h  7.2 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * Parameters related to the VERSAbus i/o configuration.
        !            22:  */
        !            23: 
        !            24: /*
        !            25:  * VERSAbus i/o devices use either memory mapped interfaces
        !            26:  * or mapped i/o register banks, or some of both.  Page tables
        !            27:  * are allocated at boot time by each device driver, as needed.
        !            28:  * VMEMmap is used to map a fixed size portion of the VERSAbus
        !            29:  * i/o space, while VMEMmap1 maps dynamically defined portions
        !            30:  * for devices which utilize shared i/o memory.  VBmap is used
        !            31:  * for mapping kernel intermediate buffers for DMA devices which
        !            32:  * are incapable of utilizing user virtual addresses or which
        !            33:  * require page aligned i/o buffers.  The size of the VMEMmap1
        !            34:  * VBmap tables must be large enough for the needs of all devices
        !            35:  * in the system.
        !            36:  */
        !            37: extern struct pte VMEMmap[], VMEMmap1[];
        !            38: extern caddr_t vmem1, vmemend;
        !            39: extern struct pte VBmap[];
        !            40: extern caddr_t vbbase, vbend; 
        !            41: 
        !            42: /*
        !            43:  * The following macros relate to the segmentation of the VERSAbus
        !            44:  * i/o space.
        !            45:  *
        !            46:  * The VERSAbus adapter segments the i/o space (as seen by the cpu)
        !            47:  * into three regions.  Cpu accesses to the upper 64Kb of the i/o space
        !            48:  * generate VERSAbus cycles with a 16-bit address and a non-privileged
        !            49:  * short i/o space address modifier.  Accesses to the next 1Mb - 64Kb
        !            50:  * generate 24-bit addresses and a non-privileged standard address
        !            51:  * modifier.  Accesses to the remainder of the 1Gb i/o space generate
        !            52:  * 32-bit addresses with a non-privileged extended address modifier.
        !            53:  * Beware that 32-bit addresses generated from this region always have
        !            54:  * zero in the upper 2 bits; e.g. a reference to physical address fe000000
        !            55:  * results in a VERSAbus address of 3e000000.
        !            56:  */
        !            57: #define        VBIO16BIT(a)    ((unsigned)0xfffe0000 <= ((unsigned)(a)))
        !            58: #define        VBIO24BIT(a)    ((unsigned)0xff000000 <= ((unsigned)(a)) && \
        !            59:                         ((unsigned)(a)) < (unsigned)0xfffe0000)
        !            60: #define        VBIO32BIT(a)    (((unsigned)(a)) < (unsigned)0xff000000)
        !            61: 
        !            62: /* 
        !            63:  * The following constants define the fixed size map of the
        !            64:  * VERSAbus i/o space.  The values should reflect the range
        !            65:  * of i/o addresses used by all the controllers unprepared
        !            66:  * to allocate and initialize their own page maps.
        !            67:  */
        !            68: #define VBIOBASE       0xfff00000      /* base of VERSAbus address space */
        !            69: #define VBIOEND                0xffffee45      /* last address in mapped space */
        !            70: /* number of entries in the system page table for i/o space */
        !            71: #define VBIOSIZE       btoc(VBIOEND-VBIOBASE)
        !            72: /* is device in mapped region */
        !            73: #define        VBIOMAPPED(a)   ((unsigned)VBIOBASE <= ((unsigned)(a)) && \
        !            74:                         ((unsigned)(a)) <= (unsigned)VBIOEND) 
        !            75: #define        vboff(addr)     ((int)(((caddr_t)(addr)) - VBIOBASE))

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