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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 | |||
1924 | jermar | 43 | /* |
44 | * For now, we use 0 as INR. |
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45 | * However, on some architectures 0 is the clock interrupt (e.g. amd64 and ia32). |
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46 | * It is therefore desirable to have architecture specific definition of KLOG_VIRT_INR |
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47 | * in the future. |
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48 | */ |
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49 | #define KLOG_VIRT_INR 0 |
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50 | |||
1595 | palkovsky | 51 | /* Order of frame to be allocated for klog communication */ |
1923 | jermar | 52 | #define KLOG_ORDER 0 |
1595 | palkovsky | 53 | |
54 | static char *klog; |
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55 | static int klogsize; |
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56 | static int klogpos; |
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57 | |||
58 | SPINLOCK_INITIALIZE(klog_lock); |
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59 | |||
1923 | jermar | 60 | static irq_t klog_irq; |
61 | |||
62 | static irq_ownership_t klog_claim(void); |
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63 | |||
1643 | palkovsky | 64 | /** Initialize kernel logging facility |
1595 | palkovsky | 65 | * |
1643 | palkovsky | 66 | * Allocate pages that are to be shared with uspace for console data. |
67 | * The shared area is a circular buffer. Userspace application may |
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68 | * be notified on new data with indication of position and size |
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69 | * of the data within the circular buffer. |
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1595 | palkovsky | 70 | */ |
71 | void klog_init(void) |
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72 | { |
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73 | void *faddr; |
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74 | |||
1760 | palkovsky | 75 | faddr = frame_alloc(KLOG_ORDER, FRAME_ATOMIC); |
1595 | palkovsky | 76 | if (!faddr) |
77 | panic("Cannot allocate page for klog"); |
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78 | klog = (char *)PA2KA(faddr); |
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79 | |||
1923 | jermar | 80 | devno_t devno = device_assign_devno(); |
81 | |||
1780 | jermar | 82 | sysinfo_set_item_val("klog.faddr", NULL, (unative_t)faddr); |
1595 | palkovsky | 83 | sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER); |
1923 | jermar | 84 | sysinfo_set_item_val("klog.devno", NULL, devno); |
1924 | jermar | 85 | sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR); |
1595 | palkovsky | 86 | |
1923 | jermar | 87 | irq_initialize(&klog_irq); |
88 | klog_irq.devno = devno; |
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1924 | jermar | 89 | klog_irq.inr = KLOG_VIRT_INR; |
1923 | jermar | 90 | klog_irq.claim = klog_claim; |
91 | irq_register(&klog_irq); |
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92 | |||
1595 | palkovsky | 93 | klogsize = PAGE_SIZE << KLOG_ORDER; |
94 | klogpos = 0; |
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95 | } |
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96 | |||
1923 | jermar | 97 | /** Allways refuse IRQ ownership. |
98 | * |
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99 | * This is not a real IRQ, so we always decline. |
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100 | * |
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101 | * @return Always returns IRQ_DECLINE. |
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102 | */ |
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103 | irq_ownership_t klog_claim(void) |
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104 | { |
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105 | return IRQ_DECLINE; |
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106 | } |
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107 | |||
1595 | palkovsky | 108 | static void klog_vprintf(const char *fmt, va_list args) |
109 | { |
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110 | int ret; |
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111 | va_list atst; |
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112 | |||
113 | va_copy(atst, args); |
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114 | spinlock_lock(&klog_lock); |
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115 | |||
116 | ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst); |
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1613 | palkovsky | 117 | if (ret >= klogsize-klogpos) { |
1595 | palkovsky | 118 | klogpos = 0; |
1613 | palkovsky | 119 | if (ret >= klogsize) |
1595 | palkovsky | 120 | goto out; |
121 | } |
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1923 | jermar | 122 | ipc_irq_send_msg(&klog_irq, klogpos, ret, 0); |
1595 | palkovsky | 123 | klogpos += ret; |
124 | if (klogpos >= klogsize) |
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125 | klogpos = 0; |
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126 | out: |
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127 | spinlock_unlock(&klog_lock); |
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128 | va_end(atst); |
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129 | } |
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130 | |||
131 | /** Printf a message to kernel-uspace log */ |
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132 | void klog_printf(const char *fmt, ...) |
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133 | { |
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134 | va_list args; |
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135 | |||
136 | va_start(args, fmt); |
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137 | |||
138 | klog_vprintf(fmt, args); |
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139 | |||
140 | va_end(args); |
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141 | } |
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1702 | cejka | 142 | |
1888 | jermar | 143 | /** @} |
1702 | cejka | 144 | */ |