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Annotation of 43BSDReno/sys/tahoevba/vbaparam.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution is only permitted until one year after the first shipment
                      6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
                      7:  * binary forms are permitted provided that: (1) source distributions retain
                      8:  * this entire copyright notice and comment, and (2) distributions including
                      9:  * binaries display the following acknowledgement:  This product includes
                     10:  * software developed by the University of California, Berkeley and its
                     11:  * contributors'' in the documentation or other materials provided with the
                     12:  * distribution and in all advertising materials mentioning features or use
                     13:  * of this software.  Neither the name of the University nor the names of
                     14:  * its contributors may be used to endorse or promote products derived from
                     15:  * this software without specific prior written permission.
                     16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     19:  *
                     20:  *     @(#)vbaparam.h  7.3 (Berkeley) 6/28/90
                     21:  */
                     22: 
                     23: /*
                     24:  * Parameters related to the VERSAbus i/o configuration.
                     25:  */
                     26: 
                     27: /*
                     28:  * VERSAbus i/o devices use either memory mapped interfaces
                     29:  * or mapped i/o register banks, or some of both.  Page tables
                     30:  * are allocated at boot time by each device driver, as needed.
                     31:  * VMEMmap is used to map a fixed size portion of the VERSAbus
                     32:  * i/o space, while VMEMmap1 maps dynamically defined portions
                     33:  * for devices which utilize shared i/o memory.  VBmap is used
                     34:  * for mapping kernel intermediate buffers for DMA devices which
                     35:  * are incapable of utilizing user virtual addresses or which
                     36:  * require page aligned i/o buffers.  The size of the VMEMmap1
                     37:  * VBmap tables must be large enough for the needs of all devices
                     38:  * in the system.
                     39:  */
                     40: extern struct pte VMEMmap[], VMEMmap1[];
                     41: extern caddr_t vmem1, vmemend;
                     42: extern struct pte VBmap[];
                     43: extern caddr_t vbbase, vbend; 
                     44: 
                     45: /*
                     46:  * The following macros relate to the segmentation of the VERSAbus
                     47:  * i/o space.
                     48:  *
                     49:  * The VERSAbus adapter segments the i/o space (as seen by the cpu)
                     50:  * into three regions.  Cpu accesses to the upper 64Kb of the i/o space
                     51:  * generate VERSAbus cycles with a 16-bit address and a non-privileged
                     52:  * short i/o space address modifier.  Accesses to the next 1Mb - 64Kb
                     53:  * generate 24-bit addresses and a non-privileged standard address
                     54:  * modifier.  Accesses to the remainder of the 1Gb i/o space generate
                     55:  * 32-bit addresses with a non-privileged extended address modifier.
                     56:  * Beware that 32-bit addresses generated from this region always have
                     57:  * zero in the upper 2 bits; e.g. a reference to physical address fe000000
                     58:  * results in a VERSAbus address of 3e000000.
                     59:  */
                     60: #define        VBIO16BIT(a)    ((unsigned)0xfffe0000 <= ((unsigned)(a)))
                     61: #define        VBIO24BIT(a)    ((unsigned)0xff000000 <= ((unsigned)(a)) && \
                     62:                         ((unsigned)(a)) < (unsigned)0xfffe0000)
                     63: #define        VBIO32BIT(a)    (((unsigned)(a)) < (unsigned)0xff000000)
                     64: 
                     65: /* 
                     66:  * The following constants define the fixed size map of the
                     67:  * VERSAbus i/o space.  The values should reflect the range
                     68:  * of i/o addresses used by all the controllers unprepared
                     69:  * to allocate and initialize their own page maps.
                     70:  */
                     71: #define VBIOBASE       0xfff00000      /* base of VERSAbus address space */
                     72: #define VBIOEND                0xffffee45      /* last address in mapped space */
                     73: /* number of entries in the system page table for i/o space */
                     74: #define VBIOSIZE       btoc(VBIOEND-VBIOBASE)
                     75: /* is device in mapped region */
                     76: #define        VBIOMAPPED(a)   ((unsigned)VBIOBASE <= ((unsigned)(a)) && \
                     77:                         ((unsigned)(a)) <= (unsigned)VBIOEND) 
                     78: #define        vboff(addr)     ((int)(((caddr_t)(addr)) - VBIOBASE))

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