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| Rev | Author | Line No. | Line |
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| 1816 | decky | 1 | /* |
| 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 | |||
| 29 | /** @addtogroup xen32 |
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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 Xen32 console driver. |
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| 35 | */ |
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| 36 | |||
| 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 | |||
| 1831 | decky | 43 | #define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1)) |
| 44 | |||
| 45 | static bool asynchronous = false; |
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| 1816 | decky | 46 | static void xen_putchar(chardev_t *d, const char ch); |
| 47 | |||
| 48 | chardev_t xen_console; |
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| 49 | static chardev_operations_t xen_ops = { |
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| 50 | .write = xen_putchar |
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| 51 | }; |
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| 52 | |||
| 53 | void xen_console_init(void) |
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| 54 | { |
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| 55 | chardev_initialize("xen_out", &xen_console, &xen_ops); |
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| 56 | stdout = &xen_console; |
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| 1831 | decky | 57 | if (!(start_info.flags & SIF_INITDOMAIN)) |
| 58 | asynchronous = true; |
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| 1816 | decky | 59 | } |
| 60 | |||
| 61 | void xen_putchar(chardev_t *d, const char ch) |
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| 62 | { |
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| 1831 | decky | 63 | if (asynchronous) { |
| 1832 | decky | 64 | uint32_t cons = console_page.out_cons; |
| 65 | uint32_t prod = console_page.out_prod; |
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| 1831 | decky | 66 | |
| 67 | memory_barrier(); |
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| 68 | |||
| 1832 | decky | 69 | if ((prod - cons) > sizeof(console_page.out)) |
| 1831 | decky | 70 | return; |
| 71 | |||
| 72 | if (ch == '\n') |
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| 1832 | decky | 73 | console_page.out[MASK_INDEX(prod++, console_page.out)] = '\r'; |
| 74 | console_page.out[MASK_INDEX(prod++, console_page.out)] = ch; |
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| 1831 | decky | 75 | |
| 76 | write_barrier(); |
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| 77 | |||
| 1832 | decky | 78 | console_page.out_prod = prod; |
| 1831 | decky | 79 | |
| 80 | xen_notify_remote(start_info.console_evtchn); |
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| 81 | } else |
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| 82 | xen_console_io(CONSOLE_IO_WRITE, 1, &ch); |
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| 1816 | decky | 83 | } |
| 84 | |||
| 85 | /** @} |
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| 86 | */ |