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3549 rimsky 1 
/*
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 * Copyright (c) 2006 Ondrej Palkovsky
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 * Copyright (c) 2008 Martin Decky
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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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/** @defgroup sgcnfb SGCN
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 * @brief   userland driver of the Serengeti console output
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 * @{
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 */
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/** @file
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 */
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#include <async.h>
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#include <sysinfo.h>
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#include <as.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ddi.h>
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#include "serial_console.h"
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#include "sgcn.h"
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#define WIDTH 80
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#define HEIGHT 24
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/**
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 * Virtual address mapped to SRAM.
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 */
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static uintptr_t sram_virt_addr;
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/**
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 * SGCN buffer offset within SGCN.
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 */
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static uintptr_t sram_buffer_offset;
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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[4];
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    /** we don't need this */
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    char unused[24];
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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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/*
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 * Returns a pointer to the object of a given type which is placed at the given
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 * offset from the console buffer beginning.
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 */
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#define SGCN_BUFFER(type, offset) \
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        ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
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/** Returns a pointer to the console buffer header. */
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#define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))
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/**
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 * Pushes the character to the SGCN serial.
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 * @param c character to be pushed
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 */
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static void sgcn_putc(char c)
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{
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    uint32_t begin = SGCN_BUFFER_HEADER->out_begin;
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    uint32_t end = SGCN_BUFFER_HEADER->out_end;
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    uint32_t size = end - begin;
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    /* we need pointers to volatile variables */
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    volatile char *buf_ptr = (volatile char *)
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        SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr);
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    volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr);
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    volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr);
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    uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin;
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    while (*out_rdptr_ptr == new_wrptr)
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        ;
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    *buf_ptr = c;
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    *out_wrptr_ptr = new_wrptr;
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}
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/**
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 * Initializes the SGCN serial driver.
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 */
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int sgcn_init(void)
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{
3908 decky 124 
    sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
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    if (physmem_map((void *) sysinfo_value("sram.address.physical"),
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        (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
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        AS_AREA_READ | AS_AREA_WRITE) != 0)
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        return -1;
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    serial_console_init(sgcn_putc, WIDTH, HEIGHT);
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    sram_buffer_offset = sysinfo_value("sram.buffer.offset");
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3716 svoboda 135 
    async_set_client_connection(serial_client_connection);
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    return 0;
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}
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/**
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 * @}
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 */
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