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3674 svoboda 1
/*
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 * Copyright (c) 2008 Pavel Rimsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup sparc64
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_sparc64_SGCN_H_
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#define KERN_sparc64_SGCN_H_
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#include <arch/types.h>
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/* number of bytes in the TOC magic, including the terminating '\0' */
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#define TOC_MAGIC_BYTES     8
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/* number of bytes in the TOC key, including the terminating '\0' */
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#define TOC_KEY_SIZE        8
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/* maximum number of entries in the SRAM table of contents */
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#define MAX_TOC_ENTRIES     32
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/* number of bytes in the SGCN buffer magic, including the terminating '\0' */
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#define SGCN_MAGIC_BYTES    4
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/**
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 * Entry in the SRAM table of contents. Describes one segment of the SRAM
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 * which serves a particular purpose (e.g. OBP serial console, Solaris serial
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 * console, Solaris mailbox,...).
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 */
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typedef struct {
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    /** key (e.g. "OBPCONS", "SOLCONS", "SOLMBOX",...) */
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    char key[TOC_KEY_SIZE];
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    /** size of the segment in bytes */
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    uint32_t size;
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    /** offset of the segment within SRAM */
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    uint32_t offset;
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} __attribute ((packed)) toc_entry_t;
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/**
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 * SRAM table of contents. Describes all segments within the SRAM.
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 */
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typedef struct {
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    /** hard-wired to "TOCSRAM" */
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    char magic[TOC_MAGIC_BYTES];
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    /** we don't need this */
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    char unused[8];
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    /** TOC entries */
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    toc_entry_t keys[MAX_TOC_ENTRIES];
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} __attribute__ ((packed)) iosram_toc_t;
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/**
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 * SGCN buffer header. It is placed at the very beginning of the SGCN
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 * buffer.
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 */
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typedef struct {
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    /** hard-wired to "CON" */
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    char magic[SGCN_MAGIC_BYTES];
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    /** we don't need this */
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    char unused[8];
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    /** offset within the SGCN buffer of the input buffer start */
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    uint32_t in_begin;
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    /** offset within the SGCN buffer of the input buffer end */
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    uint32_t in_end;
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    /** offset within the SGCN buffer of the input buffer read pointer */
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    uint32_t in_rdptr;
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    /** offset within the SGCN buffer of the input buffer write pointer */
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    uint32_t in_wrptr;
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    /** offset within the SGCN buffer of the output buffer start */
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    uint32_t out_begin;
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    /** offset within the SGCN buffer of the output buffer end */
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    uint32_t out_end;
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    /** offset within the SGCN buffer of the output buffer read pointer */
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    uint32_t out_rdptr;
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    /** offset within the SGCN buffer of the output buffer write pointer */
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    uint32_t out_wrptr;
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} __attribute__ ((packed)) sgcn_buffer_header_t;
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void sgcn_grab(void);
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void sgcn_release(void);
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void sgcn_poll(void);
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void sgcn_init(void);
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#endif
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/** @}
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 */