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/** @file
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/** @file
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 */
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 */
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#include <console/console.h>
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#include <console/console.h>
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#include <console/chardev.h>
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#include <console/chardev.h>
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#include <sysinfo/sysinfo.h>
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#include <synch/waitq.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#include <synch/spinlock.h>
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#include <arch/types.h>
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#include <arch/types.h>
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#include <ddi/device.h>
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#include <ddi/irq.h>
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#include <ddi/ddi.h>
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#include <ipc/irq.h>
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#include <arch.h>
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#include <arch.h>
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#include <func.h>
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#include <func.h>
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#include <print.h>
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#include <print.h>
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#include <atomic.h>
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#include <atomic.h>
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#define KLOG_SIZE 4096
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#define KLOG_SIZE PAGE_SIZE
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/**< Kernel log cyclic buffer */
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/**< Kernel log cyclic buffer */
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static char klog[KLOG_SIZE];
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static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
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/**< Kernel log initialized */
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static bool klog_inited = false;
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/**< First kernel log characters */
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/**< First kernel log characters */
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static index_t klog_start = 0;
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static index_t klog_start = 0;
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/**< Number of valid kernel log characters */
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/**< Number of valid kernel log characters */
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static size_t klog_len = 0;
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static size_t klog_len = 0;
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/**< Number of stored (not printed) kernel log characters */
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/**< Number of stored (not printed) kernel log characters */
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static size_t klog_stored = 0;
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static size_t klog_stored = 0;
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/**< Number of stored kernel log characters for uspace */
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static size_t klog_uspace = 0;
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/**< Kernel log spinlock */
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SPINLOCK_INITIALIZE(klog_lock);
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/** Physical memory area used for klog buffer */
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static parea_t klog_parea;
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/*
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 * For now, we use 0 as INR.
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 * However, it is therefore desirable to have architecture specific
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 * definition of KLOG_VIRT_INR in the future.
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 */
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#define KLOG_VIRT_INR   0
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static irq_t klog_irq;
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static chardev_operations_t null_stdout_ops = {
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static chardev_operations_t null_stdout_ops = {
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    .suspend = NULL,
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    .suspend = NULL,
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    .resume = NULL,
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    .resume = NULL,
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    .write = NULL,
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    .write = NULL,
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chardev_t null_stdout = {
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chardev_t null_stdout = {
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    .name = "null",
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    .name = "null",
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    .op = &null_stdout_ops
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    .op = &null_stdout_ops
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};
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};
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/** 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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static 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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/** Standard input character device. */
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/** Standard input character device */
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chardev_t *stdin = NULL;
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chardev_t *stdin = NULL;
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chardev_t *stdout = &null_stdout;
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chardev_t *stdout = &null_stdout;
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/** Initialize kernel logging facility
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 *
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 * The shared area contains kernel cyclic 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.
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 */
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void klog_init(void)
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{
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    void *faddr = (void *) KA2PA(klog);
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    ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
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    ASSERT(KLOG_SIZE % FRAME_SIZE == 0);
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    devno_t devno = device_assign_devno();
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    klog_parea.pbase = (uintptr_t) faddr;
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    klog_parea.vbase = (uintptr_t) klog;
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    klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
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    klog_parea.cacheable = true;
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    ddi_parea_register(&klog_parea);
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    sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
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    sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
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    sysinfo_set_item_val("klog.devno", NULL, devno);
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    sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
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    irq_initialize(&klog_irq);
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    klog_irq.devno = devno;
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    klog_irq.inr = KLOG_VIRT_INR;
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    klog_irq.claim = klog_claim;
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    irq_register(&klog_irq);
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    spinlock_lock(&klog_lock);
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    klog_inited = true;
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    spinlock_unlock(&klog_lock);
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}
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/** Get character from character device. Do not echo character.
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/** Get character from character device. Do not echo character.
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 *
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 *
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 * @param chardev Character device.
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 * @param chardev Character device.
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 *
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 *
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 * @return Character read.
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 * @return Character read.
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    ch = _getc(chardev);
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    ch = _getc(chardev);
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    putchar(ch);
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    putchar(ch);
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    return ch;
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    return ch;
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}
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}
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void klog_update(void)
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{
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    spinlock_lock(&klog_lock);
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    if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
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        ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
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        klog_uspace = 0;
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    }
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    spinlock_unlock(&klog_lock);
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}
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void putchar(char c)
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void putchar(char c)
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{
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{
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    spinlock_lock(&klog_lock);
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    if ((klog_stored > 0) && (stdout->op->write)) {
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    if ((klog_stored > 0) && (stdout->op->write)) {
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        /* Print charaters stored in kernel log */
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        /* Print charaters stored in kernel log */
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        index_t i;
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        index_t i;
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        for (i = klog_len - klog_stored; i < klog_len; i++)
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        for (i = klog_len - klog_stored; i < klog_len; i++)
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            stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]);
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            stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]);
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    else {
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    else {
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        /* The character is just in the kernel log */
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        /* The character is just in the kernel log */
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        if (klog_stored < klog_len)
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        if (klog_stored < klog_len)
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            klog_stored++;
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            klog_stored++;
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    }
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    }
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 274 
    /* The character is stored for uspace */
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 275 
    if (klog_uspace < klog_len)
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 276 
        klog_uspace++;
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 278 
    spinlock_unlock(&klog_lock);
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 279 
   
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 280 
    klog_update();
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}
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}
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/** @}
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/** @}
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 */
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 */