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1816 decky 1
/*
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 * Copyright (c) 2006 Martin Decky
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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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1952 jermar 29
/** @addtogroup ia32xen
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 * @{
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 */
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/**
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 * @file
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 * @brief ia32xen console driver.
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 */
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#include <arch/drivers/xconsole.h>
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#include <putchar.h>
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#include <console/chardev.h>
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#include <console/console.h>
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#include <arch/hypercall.h>
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#define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1))
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static void xen_putchar(chardev_t *d, const char ch);
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chardev_t xen_console;
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static chardev_operations_t xen_ops = {
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    .write = xen_putchar
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};
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void xen_console_init(void)
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{
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    chardev_initialize("xen_out", &xen_console, &xen_ops);
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    stdout = &xen_console;
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}
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void xen_putchar(chardev_t *d, const char ch)
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{
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    if (start_info.console.domU.evtchn != 0) {
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        uint32_t cons = console_page.out_cons;
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        uint32_t prod = console_page.out_prod;
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        memory_barrier();
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        if ((prod - cons) > sizeof(console_page.out))
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            return;
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        if (ch == '\n')
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            console_page.out[MASK_INDEX(prod++, console_page.out)] = '\r';
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        console_page.out[MASK_INDEX(prod++, console_page.out)] = ch;
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        write_barrier();
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        console_page.out_prod = prod;
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        xen_notify_remote(start_info.console.domU.evtchn);
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    } else
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        xen_console_io(CONSOLE_IO_WRITE, 1, &ch);
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}
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/** @}
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 */