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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 | |||
| 29 | #include <mm/frame.h> |
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| 30 | #include <sysinfo/sysinfo.h> |
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| 31 | #include <console/klog.h> |
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| 32 | #include <print.h> |
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| 33 | #include <ipc/irq.h> |
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| 34 | |||
| 35 | /* Order of frame to be allocated for klog communication */ |
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| 36 | #define KLOG_ORDER 0 |
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| 37 | |||
| 38 | static char *klog; |
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| 39 | static int klogsize; |
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| 40 | static int klogpos; |
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| 41 | |||
| 42 | SPINLOCK_INITIALIZE(klog_lock); |
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| 43 | |||
| 44 | /** Initialize kernel loggin facility |
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| 45 | * |
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| 46 | * Allocate pages that are to be shared if uspace for console data |
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| 47 | */ |
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| 48 | void klog_init(void) |
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| 49 | { |
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| 50 | void *faddr; |
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| 51 | |||
| 52 | faddr = (void *)PFN2ADDR(frame_alloc(KLOG_ORDER, FRAME_ATOMIC)); |
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| 53 | if (!faddr) |
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| 54 | panic("Cannot allocate page for klog"); |
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| 55 | klog = (char *)PA2KA(faddr); |
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| 56 | |||
| 57 | sysinfo_set_item_val("klog.faddr", NULL, (__native)faddr); |
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| 58 | sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER); |
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| 59 | |||
| 60 | klogsize = PAGE_SIZE << KLOG_ORDER; |
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| 61 | klogpos = 0; |
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| 62 | } |
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| 63 | |||
| 64 | static void klog_vprintf(const char *fmt, va_list args) |
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| 65 | { |
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| 66 | int ret; |
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| 67 | va_list atst; |
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| 68 | |||
| 69 | va_copy(atst, args); |
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| 70 | spinlock_lock(&klog_lock); |
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| 71 | |||
| 72 | ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst); |
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| 73 | // Workaround around bad return value from vsnprintf |
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| 74 | if (ret+klogpos < klogsize) |
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| 75 | ret = 100; |
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| 76 | if (ret == klogsize-klogpos) { |
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| 77 | klogpos = 0; |
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| 78 | ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, args); |
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| 79 | ret = 100; |
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| 80 | if (ret == klogsize) |
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| 81 | goto out; |
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| 82 | } |
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| 83 | ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret); |
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| 84 | klogpos += ret; |
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| 85 | if (klogpos >= klogsize) |
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| 86 | klogpos = 0; |
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| 87 | out: |
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| 88 | spinlock_unlock(&klog_lock); |
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| 89 | va_end(atst); |
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| 90 | } |
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| 91 | |||
| 92 | /** Printf a message to kernel-uspace log */ |
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| 93 | void klog_printf(const char *fmt, ...) |
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| 94 | { |
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| 95 | va_list args; |
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| 96 | |||
| 97 | va_start(args, fmt); |
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| 98 | |||
| 99 | klog_vprintf(fmt, args); |
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| 100 | |||
| 101 | va_end(args); |
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| 102 | } |