FreeBSD/Linux Kernel Cross Reference
sys/sparc64/include/iommuvar.h

     /*-
      * Copyright (c) 1999 Matthew R. Green
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     * 3. 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.
     *
     *      from: NetBSD: iommuvar.h,v 1.9 2001/07/20 00:07:13 eeh Exp
     *
     * $FreeBSD: releng/6.0/sys/sparc64/include/iommuvar.h 139825 2005-01-07 02:29:27Z imp $
     */
    
    #ifndef _MACHINE_IOMMUVAR_H_
    #define _MACHINE_IOMMUVAR_H_
    
    #define IO_PAGE_SIZE            PAGE_SIZE_8K
    #define IO_PAGE_MASK            PAGE_MASK_8K
    #define IO_PAGE_SHIFT           PAGE_SHIFT_8K
    #define round_io_page(x)        round_page(x)
    #define trunc_io_page(x)        trunc_page(x)
    
    /*
     * Per-IOMMU state. The parenthesized comments indicate the locking strategy:
     *      i - protected by iommu_mtx.
     *      r - read-only after initialization.
     *      * - comment refers to pointer target / target hardware registers
     *          (for bus_addr_t).
     * iommu_map_lruq is also locked by iommu_mtx. Elements of iommu_tsb may only
     * be accessed from functions operating on the map owning the corresponding
     * resource, so the locking the user is required to do to protect the map is
     * sufficient. As soon as the TSBs are divorced, these will be moved into struct
     * iommu_state, and each state struct will get its own lock.
     * iommu_dvma_rman needs to be moved there too, but has its own internal lock.
     */
    struct iommu_state {
            int                     is_tsbsize;     /* (r) 0 = 8K, ... */
            u_int64_t               is_dvmabase;    /* (r) */
            int64_t                 is_cr;          /* (r) Control reg value */
    
            vm_paddr_t              is_flushpa[2];  /* (r) */
            volatile int64_t        *is_flushva[2]; /* (r, *i) */
            /*
             * (i)
             * When a flush is completed, 64 bytes will be stored at the given
             * location, the first double word being 1, to indicate completion.
             * The lower 6 address bits are ignored, so the addresses need to be
             * suitably aligned; over-allocate a large enough margin to be able
             * to adjust it.
             * Two such buffers are needed.
             */
            volatile char           is_flush[STRBUF_FLUSHSYNC_NBYTES * 3 - 1];
    
            /* copies of our parents state, to allow us to be self contained */
            bus_space_tag_t         is_bustag;      /* (r) Our bus tag */
            bus_space_handle_t      is_bushandle;   /* (r) */
            bus_addr_t              is_iommu;       /* (r, *i) IOMMU registers */
            bus_addr_t              is_sb[2];       /* (r, *i) Streaming buffer */
            /* Tag diagnostics access */
            bus_addr_t              is_dtag;        /* (r, *r) */
            /* Data RAM diagnostic access */
            bus_addr_t              is_ddram;       /* (r, *r) */
            /* LRU queue diag. access */
            bus_addr_t              is_dqueue;      /* (r, *r) */
            /* Virtual address diagnostics register */
            bus_addr_t              is_dva;         /* (r, *r) */
            /* Tag compare diagnostics access */
            bus_addr_t              is_dtcmp;       /* (r, *r) */
    
            STAILQ_ENTRY(iommu_state)       is_link;        /* (r) */
    };
    
    /* interfaces for PCI/SBUS code */
    void iommu_init(char *, struct iommu_state *, int, u_int32_t, int);
    void iommu_reset(struct iommu_state *);
    void iommu_decode_fault(struct iommu_state *, vm_offset_t);
    
    extern struct bus_dma_methods iommu_dma_methods;
    
    #endif /* !_MACHINE_IOMMUVAR_H_ */

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