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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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1831 | decky | 42 | #include <mm/frame.h> |
1816 | decky | 43 | |
1831 | decky | 44 | #define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1)) |
45 | |||
46 | typedef struct { |
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47 | char in[1024]; |
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48 | char out[2048]; |
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49 | uint32_t in_cons; |
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50 | uint32_t in_prod; |
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51 | uint32_t out_cons; |
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52 | uint32_t out_prod; |
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53 | } xencons_t; |
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54 | |||
55 | static bool asynchronous = false; |
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1816 | decky | 56 | static void xen_putchar(chardev_t *d, const char ch); |
57 | |||
58 | chardev_t xen_console; |
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59 | static chardev_operations_t xen_ops = { |
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60 | .write = xen_putchar |
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61 | }; |
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62 | |||
63 | void xen_console_init(void) |
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64 | { |
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65 | chardev_initialize("xen_out", &xen_console, &xen_ops); |
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66 | stdout = &xen_console; |
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1831 | decky | 67 | if (!(start_info.flags & SIF_INITDOMAIN)) |
68 | asynchronous = true; |
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1816 | decky | 69 | } |
70 | |||
71 | void xen_putchar(chardev_t *d, const char ch) |
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72 | { |
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1831 | decky | 73 | if (asynchronous) { |
74 | xencons_t *console = (xencons_t *) PA2KA(MA2PA(PFN2ADDR(start_info.console_mfn))); |
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75 | uint32_t cons = console->out_cons; |
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76 | uint32_t prod = console->out_prod; |
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77 | |||
78 | memory_barrier(); |
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79 | |||
80 | if ((prod - cons) > sizeof(console->out)) |
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81 | return; |
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82 | |||
83 | if (ch == '\n') |
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84 | console->out[MASK_INDEX(prod++, console->out)] = '\r'; |
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85 | console->out[MASK_INDEX(prod++, console->out)] = ch; |
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86 | |||
87 | write_barrier(); |
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88 | |||
89 | console->out_prod = prod; |
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90 | |||
91 | xen_notify_remote(start_info.console_evtchn); |
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92 | } else |
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93 | xen_console_io(CONSOLE_IO_WRITE, 1, &ch); |
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1816 | decky | 94 | } |
95 | |||
96 | /** @} |
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97 | */ |