| 1 | /*
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| 2 | * Copyright (c) 2006 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup ia32xen
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | * @brief ia32xen console driver.
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| 35 | */
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| 36 |
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| 37 | #include <arch/drivers/xconsole.h>
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| 38 | #include <putchar.h>
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| 39 | #include <console/chardev.h>
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| 40 | #include <console/console.h>
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| 41 | #include <arch/hypercall.h>
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| 42 |
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| 43 | #define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1))
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| 44 |
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| 45 | static void xen_putchar(chardev_t *d, const char ch);
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| 46 |
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| 47 | chardev_t xen_console;
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| 48 | static chardev_operations_t xen_ops = {
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| 49 | .write = xen_putchar
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| 50 | };
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| 51 |
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| 52 | void xen_console_init(void)
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| 53 | {
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| 54 | chardev_initialize("xen_out", &xen_console, &xen_ops);
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| 55 | stdout = &xen_console;
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| 56 | }
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| 57 |
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| 58 | void xen_putchar(chardev_t *d, const char ch)
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| 59 | {
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| 60 | if (start_info.console.domU.evtchn != 0) {
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| 61 | uint32_t cons = console_page.out_cons;
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| 62 | uint32_t prod = console_page.out_prod;
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| 63 |
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| 64 | memory_barrier();
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| 65 |
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| 66 | if ((prod - cons) > sizeof(console_page.out))
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| 67 | return;
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| 68 |
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| 69 | if (ch == '\n')
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| 70 | console_page.out[MASK_INDEX(prod++, console_page.out)] = '\r';
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| 71 | console_page.out[MASK_INDEX(prod++, console_page.out)] = ch;
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| 72 |
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| 73 | write_barrier();
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| 74 |
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| 75 | console_page.out_prod = prod;
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| 76 |
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| 77 | xen_notify_remote(start_info.console.domU.evtchn);
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| 78 | } else
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| 79 | xen_console_io(CONSOLE_IO_WRITE, 1, &ch);
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| 80 | }
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| 81 |
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| 82 | /** @}
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| 83 | */
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