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1595 palkovsky 1 
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1888 jermar 29 
/** @addtogroup genericklog
1702 cejka 30 
 * @{
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 */
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/** @file
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 */
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1595 palkovsky 35 
#include <mm/frame.h>
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#include <sysinfo/sysinfo.h>
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#include <console/klog.h>
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#include <print.h>
1923 jermar 39 
#include <ddi/device.h>
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#include <ddi/irq.h>
1595 palkovsky 41 
#include <ipc/irq.h>
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1924 jermar 43 
/*
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 * For now, we use 0 as INR.
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 * However, on some architectures 0 is the clock interrupt (e.g. amd64 and ia32).
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 * It is therefore desirable to have architecture specific definition of KLOG_VIRT_INR
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 * in the future.
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 */
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#define KLOG_VIRT_INR   0
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1595 palkovsky 51 
/* Order of frame to be allocated for klog communication */
1923 jermar 52 
#define KLOG_ORDER  0
1595 palkovsky 53 
 
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static char *klog;
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static int klogsize;
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static int klogpos;
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SPINLOCK_INITIALIZE(klog_lock);
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1923 jermar 60 
static irq_t klog_irq;
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static irq_ownership_t klog_claim(void);
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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.
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 * The shared area is a circular buffer. Userspace application may
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 * be notified on new data with indication of position and size
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 * of the data within the circular buffer.
1595 palkovsky 70 
 */
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void klog_init(void)
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{
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    void *faddr;
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1760 palkovsky 75 
    faddr = frame_alloc(KLOG_ORDER, FRAME_ATOMIC);
1595 palkovsky 76 
    if (!faddr)
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        panic("Cannot allocate page for klog");
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    klog = (char *)PA2KA(faddr);
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1923 jermar 80 
    devno_t devno = device_assign_devno();
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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);
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    klog_irq.devno = devno;
1924 jermar 89 
    klog_irq.inr = KLOG_VIRT_INR;
1923 jermar 90 
    klog_irq.claim = klog_claim;
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    irq_register(&klog_irq);
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1595 palkovsky 93 
    klogsize = PAGE_SIZE << KLOG_ORDER;
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    klogpos = 0;
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}
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1923 jermar 97 
/** Allways refuse IRQ ownership.
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 *
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 * This is not a real IRQ, so we always decline.
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 *
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 * @return Always returns IRQ_DECLINE.
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 */
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irq_ownership_t klog_claim(void)
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{
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    return IRQ_DECLINE;
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}
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1595 palkovsky 108 
static void klog_vprintf(const char *fmt, va_list args)
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{
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    int ret;
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    va_list atst;
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    va_copy(atst, args);
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    spinlock_lock(&klog_lock);
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    ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
1613 palkovsky 117 
    if (ret >= klogsize-klogpos) {
1595 palkovsky 118 
        klogpos = 0;
1613 palkovsky 119 
        if (ret >= klogsize)
1595 palkovsky 120 
            goto out;
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    }
1923 jermar 122 
    ipc_irq_send_msg(&klog_irq, klogpos, ret, 0);
1595 palkovsky 123 
    klogpos += ret;
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    if (klogpos >= klogsize)
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        klogpos = 0;
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out:
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    spinlock_unlock(&klog_lock);
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    va_end(atst);
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}
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/** Printf a message to kernel-uspace log */
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void klog_printf(const char *fmt, ...)
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{
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    va_list args;
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    va_start(args, fmt);
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    klog_vprintf(fmt, args);
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    va_end(args);
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}
1702 cejka 142 
 
1888 jermar 143 
/** @}
1702 cejka 144 
 */