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1595 | palkovsky | 1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
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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 | |||
1705 | cejka | 29 | /** @addtogroup genericklog |
1702 | cejka | 30 | * @{ |
31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
1595 | palkovsky | 35 | #include <mm/frame.h> |
36 | #include <sysinfo/sysinfo.h> |
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37 | #include <console/klog.h> |
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38 | #include <print.h> |
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39 | #include <ipc/irq.h> |
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40 | |||
41 | /* Order of frame to be allocated for klog communication */ |
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42 | #define KLOG_ORDER 0 |
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43 | |||
44 | static char *klog; |
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45 | static int klogsize; |
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46 | static int klogpos; |
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47 | |||
48 | SPINLOCK_INITIALIZE(klog_lock); |
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49 | |||
1643 | palkovsky | 50 | /** Initialize kernel logging facility |
1595 | palkovsky | 51 | * |
1643 | palkovsky | 52 | * Allocate pages that are to be shared with uspace for console data. |
53 | * The shared area is a circular buffer. Userspace application may |
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54 | * be notified on new data with indication of position and size |
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55 | * of the data within the circular buffer. |
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1595 | palkovsky | 56 | */ |
57 | void klog_init(void) |
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58 | { |
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59 | void *faddr; |
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60 | |||
61 | faddr = (void *)PFN2ADDR(frame_alloc(KLOG_ORDER, FRAME_ATOMIC)); |
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62 | if (!faddr) |
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63 | panic("Cannot allocate page for klog"); |
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64 | klog = (char *)PA2KA(faddr); |
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65 | |||
66 | sysinfo_set_item_val("klog.faddr", NULL, (__native)faddr); |
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67 | sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER); |
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68 | |||
69 | klogsize = PAGE_SIZE << KLOG_ORDER; |
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70 | klogpos = 0; |
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71 | } |
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72 | |||
73 | static void klog_vprintf(const char *fmt, va_list args) |
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74 | { |
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75 | int ret; |
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76 | va_list atst; |
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77 | |||
78 | va_copy(atst, args); |
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79 | spinlock_lock(&klog_lock); |
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80 | |||
81 | ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst); |
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1613 | palkovsky | 82 | if (ret >= klogsize-klogpos) { |
1595 | palkovsky | 83 | klogpos = 0; |
1613 | palkovsky | 84 | if (ret >= klogsize) |
1595 | palkovsky | 85 | goto out; |
86 | } |
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1693 | palkovsky | 87 | ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret, 0); |
1595 | palkovsky | 88 | klogpos += ret; |
89 | if (klogpos >= klogsize) |
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90 | klogpos = 0; |
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91 | out: |
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92 | spinlock_unlock(&klog_lock); |
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93 | va_end(atst); |
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94 | } |
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95 | |||
96 | /** Printf a message to kernel-uspace log */ |
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97 | void klog_printf(const char *fmt, ...) |
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98 | { |
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99 | va_list args; |
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100 | |||
101 | va_start(args, fmt); |
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102 | |||
103 | klog_vprintf(fmt, args); |
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104 | |||
105 | va_end(args); |
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106 | } |
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1702 | cejka | 107 | |
108 | /** @} |
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109 | */ |
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110 |