| 1 | /*
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| 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 |
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| 29 | /** @addtogroup genericklog KLog
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| 30 | * @brief Kernel logging facility
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| 31 | * @ingroup kernel
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| 32 | * @{
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| 33 | */
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| 34 | /** @file
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| 35 | */
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| 36 |
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| 37 | #include <mm/frame.h>
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| 38 | #include <sysinfo/sysinfo.h>
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| 39 | #include <console/klog.h>
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| 40 | #include <print.h>
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| 41 | #include <ipc/irq.h>
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| 42 |
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| 43 | /* Order of frame to be allocated for klog communication */
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| 44 | #define KLOG_ORDER 0
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| 45 |
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| 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 |
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| 50 | SPINLOCK_INITIALIZE(klog_lock);
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| 51 |
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| 52 | /** Initialize kernel logging facility
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| 53 | *
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| 54 | * Allocate pages that are to be shared with uspace for console data.
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| 55 | * The shared area is a circular buffer. Userspace application may
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| 56 | * be notified on new data with indication of position and size
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| 57 | * of the data within the circular buffer.
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| 58 | */
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| 59 | void klog_init(void)
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| 60 | {
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| 61 | void *faddr;
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| 62 |
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| 63 | faddr = (void *)PFN2ADDR(frame_alloc(KLOG_ORDER, FRAME_ATOMIC));
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| 64 | if (!faddr)
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| 65 | panic("Cannot allocate page for klog");
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| 66 | klog = (char *)PA2KA(faddr);
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| 67 |
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| 68 | sysinfo_set_item_val("klog.faddr", NULL, (__native)faddr);
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| 69 | sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
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| 70 |
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| 71 | klogsize = PAGE_SIZE << KLOG_ORDER;
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| 72 | klogpos = 0;
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| 73 | }
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| 74 |
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| 75 | static void klog_vprintf(const char *fmt, va_list args)
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| 76 | {
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| 77 | int ret;
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| 78 | va_list atst;
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| 79 |
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| 80 | va_copy(atst, args);
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| 81 | spinlock_lock(&klog_lock);
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| 82 |
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| 83 | ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
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| 84 | if (ret >= klogsize-klogpos) {
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| 85 | klogpos = 0;
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| 86 | if (ret >= klogsize)
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| 87 | goto out;
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| 88 | }
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| 89 | ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret, 0);
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| 90 | klogpos += ret;
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| 91 | if (klogpos >= klogsize)
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| 92 | klogpos = 0;
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| 93 | out:
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| 94 | spinlock_unlock(&klog_lock);
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| 95 | va_end(atst);
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| 96 | }
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| 97 |
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| 98 | /** Printf a message to kernel-uspace log */
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| 99 | void klog_printf(const char *fmt, ...)
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| 100 | {
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| 101 | va_list args;
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| 102 |
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| 103 | va_start(args, fmt);
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| 104 |
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| 105 | klog_vprintf(fmt, args);
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| 106 |
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| 107 | va_end(args);
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| 108 | }
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| 109 |
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| 110 | /** @}
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| 111 | */
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| 112 |
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