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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 | |||
1888 | jermar | 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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1923 | jermar | 39 | #include <ddi/device.h> |
40 | #include <ddi/irq.h> |
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1595 | palkovsky | 41 | #include <ipc/irq.h> |
42 | |||
43 | /* Order of frame to be allocated for klog communication */ |
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1923 | jermar | 44 | #define KLOG_ORDER 0 |
1595 | palkovsky | 45 | |
46 | static char *klog; |
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47 | static int klogsize; |
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48 | static int klogpos; |
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49 | |||
50 | SPINLOCK_INITIALIZE(klog_lock); |
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51 | |||
1923 | jermar | 52 | static irq_t klog_irq; |
53 | |||
54 | static irq_ownership_t klog_claim(void); |
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55 | |||
1643 | palkovsky | 56 | /** Initialize kernel logging facility |
1595 | palkovsky | 57 | * |
1643 | palkovsky | 58 | * Allocate pages that are to be shared with uspace for console data. |
59 | * The shared area is a circular buffer. Userspace application may |
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60 | * be notified on new data with indication of position and size |
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61 | * of the data within the circular buffer. |
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1595 | palkovsky | 62 | */ |
63 | void klog_init(void) |
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64 | { |
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65 | void *faddr; |
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66 | |||
1760 | palkovsky | 67 | faddr = frame_alloc(KLOG_ORDER, FRAME_ATOMIC); |
1595 | palkovsky | 68 | if (!faddr) |
69 | panic("Cannot allocate page for klog"); |
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70 | klog = (char *)PA2KA(faddr); |
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71 | |||
1923 | jermar | 72 | devno_t devno = device_assign_devno(); |
73 | |||
1780 | jermar | 74 | sysinfo_set_item_val("klog.faddr", NULL, (unative_t)faddr); |
1595 | palkovsky | 75 | sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER); |
1923 | jermar | 76 | sysinfo_set_item_val("klog.devno", NULL, devno); |
77 | sysinfo_set_item_val("klog.inr", NULL, VIRT_INR_KLOG); |
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1595 | palkovsky | 78 | |
1923 | jermar | 79 | irq_initialize(&klog_irq); |
80 | klog_irq.devno = devno; |
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81 | klog_irq.inr = VIRT_INR_KLOG; |
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82 | klog_irq.claim = klog_claim; |
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83 | irq_register(&klog_irq); |
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84 | |||
1595 | palkovsky | 85 | klogsize = PAGE_SIZE << KLOG_ORDER; |
86 | klogpos = 0; |
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87 | } |
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88 | |||
1923 | jermar | 89 | /** Allways refuse IRQ ownership. |
90 | * |
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91 | * This is not a real IRQ, so we always decline. |
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92 | * |
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93 | * @return Always returns IRQ_DECLINE. |
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94 | */ |
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95 | irq_ownership_t klog_claim(void) |
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96 | { |
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97 | return IRQ_DECLINE; |
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98 | } |
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99 | |||
1595 | palkovsky | 100 | static void klog_vprintf(const char *fmt, va_list args) |
101 | { |
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102 | int ret; |
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103 | va_list atst; |
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104 | |||
105 | va_copy(atst, args); |
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106 | spinlock_lock(&klog_lock); |
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107 | |||
108 | ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst); |
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1613 | palkovsky | 109 | if (ret >= klogsize-klogpos) { |
1595 | palkovsky | 110 | klogpos = 0; |
1613 | palkovsky | 111 | if (ret >= klogsize) |
1595 | palkovsky | 112 | goto out; |
113 | } |
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1923 | jermar | 114 | ipc_irq_send_msg(&klog_irq, klogpos, ret, 0); |
1595 | palkovsky | 115 | klogpos += ret; |
116 | if (klogpos >= klogsize) |
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117 | klogpos = 0; |
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118 | out: |
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119 | spinlock_unlock(&klog_lock); |
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120 | va_end(atst); |
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121 | } |
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122 | |||
123 | /** Printf a message to kernel-uspace log */ |
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124 | void klog_printf(const char *fmt, ...) |
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125 | { |
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126 | va_list args; |
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127 | |||
128 | va_start(args, fmt); |
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129 | |||
130 | klog_vprintf(fmt, args); |
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131 | |||
132 | va_end(args); |
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133 | } |
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1702 | cejka | 134 | |
1888 | jermar | 135 | /** @} |
1702 | cejka | 136 | */ |