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Annotation of sys/arch/alpha/include/tc_machdep.h, Revision 1.1

1.1     ! nbrk        1: /* $OpenBSD: tc_machdep.h,v 1.3 2002/05/02 22:56:06 miod Exp $ */
        !             2: /* $NetBSD: tc_machdep.h,v 1.4 2000/06/01 00:04:50 cgd Exp $ */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Author: Chris G. Demetriou
        !             9:  *
        !            10:  * Permission to use, copy, modify and distribute this software and
        !            11:  * its documentation is hereby granted, provided that both the copyright
        !            12:  * notice and this permission notice appear in all copies of the
        !            13:  * software, derivative works or modified versions, and any portions
        !            14:  * thereof, and that both notices appear in supporting documentation.
        !            15:  *
        !            16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
        !            18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  *
        !            20:  * Carnegie Mellon requests users of this software to return to
        !            21:  *
        !            22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
        !            23:  *  School of Computer Science
        !            24:  *  Carnegie Mellon University
        !            25:  *  Pittsburgh PA 15213-3890
        !            26:  *
        !            27:  * any improvements or extensions that they make and grant Carnegie the
        !            28:  * rights to redistribute these changes.
        !            29:  */
        !            30:
        !            31: /*
        !            32:  * Machine-specific definitions for TurboChannel support.
        !            33:  *
        !            34:  * This file must typedef the following types:
        !            35:  *
        !            36:  *     tc_addr_t       TurboChannel bus address
        !            37:  *     tc_offset_t     TurboChannel bus address difference (offset)
        !            38:  *
        !            39:  * This file must prototype or define the following functions
        !            40:  * or macros (one or more of which may be no-ops):
        !            41:  *
        !            42:  *     tc_mb()         read/write memory barrier (any CPU<->memory
        !            43:  *                     reads/writes before must complete before any
        !            44:  *                     CPU<->memory reads/writes after).
        !            45:  *     tc_wmb()        write memory barrier (any CPU<->memory writes
        !            46:  *                     before must complete before any CPU<->memory
        !            47:  *                     writes after).
        !            48:  *     tc_syncbus()    sync TC bus; make sure CPU writes are
        !            49:  *                     propagated across the TurboChannel bus.
        !            50:  *     tc_badaddr()    return non-zero if the given address is invalid.
        !            51:  *     TC_DENSE_TO_SPARSE()
        !            52:  *                     convert the given physical address in
        !            53:  *                     TurboChannel dense space to the corresponding
        !            54:  *                     address in TurboChannel sparse space.
        !            55:  *     TC_PHYS_TO_UNCACHED()
        !            56:  *                     convert the given system memory physical address
        !            57:  *                     to the physical address of the corresponding
        !            58:  *                     region that is not cached.
        !            59:  */
        !            60:
        !            61: typedef u_int64_t      tc_addr_t;
        !            62: typedef int32_t                tc_offset_t;
        !            63:
        !            64: #define        tc_mb()         alpha_mb()
        !            65: #define        tc_wmb()        alpha_wmb()
        !            66:
        !            67: /*
        !            68:  * A junk address to read from, to make sure writes are complete.  See
        !            69:  * System Programmer's Manual, section 9.3 (p. 9-4), and sacrifice a
        !            70:  * chicken.
        !            71:  */
        !            72: #define        tc_syncbus()                                                    \
        !            73:     do {                                                               \
        !            74:        volatile u_int32_t no_optimize;                                 \
        !            75:        no_optimize =                                                   \
        !            76:            *(volatile u_int32_t *)ALPHA_PHYS_TO_K0SEG(0x00000001f0080220); \
        !            77:     } while (0)
        !            78:
        !            79: #define        tc_badaddr(tcaddr)                                              \
        !            80:     badaddr((void *)(tcaddr), sizeof (u_int32_t))
        !            81:
        !            82: #define        TC_SPACE_IND            0xffffffffe0000003
        !            83: #define        TC_SPACE_DENSE          0x0000000000000000
        !            84: #define TC_SPACE_DENSE_OFFSET  0x0000000007fffffc
        !            85: #define        TC_SPACE_SPARSE         0x0000000010000000
        !            86: #define        TC_SPACE_SPARSE_OFFSET  0x000000000ffffff8
        !            87:
        !            88: #define        TC_DENSE_TO_SPARSE(addr)                                        \
        !            89:     (((addr) & TC_SPACE_IND) | TC_SPACE_SPARSE |                       \
        !            90:        (((addr) & TC_SPACE_DENSE_OFFSET) << 1))
        !            91:
        !            92: #define        TC_PHYS_TO_UNCACHED(addr)                                       \
        !            93:     (addr)
        !            94:
        !            95: /*
        !            96:  * These functions are private, and may not be called by
        !            97:  * machine-independent code.
        !            98:  */
        !            99: bus_space_tag_t tc_bus_mem_init(void *memv);
        !           100: void tc_dma_init(void);
        !           101:
        !           102: /*
        !           103:  * Address of scatter/gather SRAM on the 3000/500-series.
        !           104:  *
        !           105:  * There is room for 32K entries, yielding 256M of sgva space.
        !           106:  * The page table is readable in both dense and sparse space.
        !           107:  * The page table is writable only in sparse space.
        !           108:  *
        !           109:  * In sparse space, the 32-bit PTEs are followed by 32-bits
        !           110:  * of pad.
        !           111:  */
        !           112: #define        TC_SGSRAM_DENSE         0x0000001c2800000UL
        !           113: #define        TC_SGSRAM_SPARSE        0x0000001d5000000UL