WebSVN – HelenOS – Diff – //branches/tracing/kernel/generic/src/console/console.c

 /** @file
  */
 #include <console/console.h>
 #include <console/chardev.h>
+#include <sysinfo/sysinfo.h>
 #include <synch/waitq.h>
 #include <synch/spinlock.h>
 #include <arch/types.h>
+#include <ddi/device.h>
+#include <ddi/irq.h>
+#include <ddi/ddi.h>
+#include <ipc/irq.h>
 #include <arch.h>
 #include <func.h>
 #include <print.h>
 #include <atomic.h>
+#define KLOG_SIZE PAGE_SIZE
-#define BUFLEN 2048
+#define KLOG_LATENCY 8
+/**< Kernel log cyclic buffer */
+static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
+/**< Kernel log initialized */
-static char debug_buffer[BUFLEN];
+static bool klog_inited = false;
+/**< First kernel log characters */
+static index_t klog_start = 0;
+/**< Number of valid kernel log characters */
-static size_t offset = 0;
+static size_t klog_len = 0;
+/**< Number of stored (not printed) kernel log characters */
+static size_t klog_stored = 0;
-/** Initialize stdout to something that does not print, but does not fail
+/**< Number of stored kernel log characters for uspace */
+static size_t klog_uspace = 0;
- *
- * Save data in some buffer so that it could be retrieved in the debugger
+/**< Kernel log spinlock */
+SPINLOCK_INITIALIZE(klog_lock);
- */
-static void null_putchar(chardev_t *d, const char ch)
+/** Physical memory area used for klog buffer */
+static parea_t klog_parea;
-{
+/*
-    if (offset >= BUFLEN)
+ * For now, we use 0 as INR.
+ * However, it is therefore desirable to have architecture specific
+ * definition of KLOG_VIRT_INR in the future.
-        offset = 0;
+ */
-    debug_buffer[offset++] = ch;
+#define KLOG_VIRT_INR   0
-}
+static irq_t klog_irq;
 static chardev_operations_t null_stdout_ops = {
+    .suspend = NULL,
+    .resume = NULL,
-    .write = null_putchar
+    .write = NULL,
+    .read = NULL
 };
 chardev_t null_stdout = {
     .name = "null",
     .op = &null_stdout_ops
 };
+/** Allways refuse IRQ ownership.
+ *
+ * This is not a real IRQ, so we always decline.
+ *
+ * @return Always returns IRQ_DECLINE.
+ */
+static irq_ownership_t klog_claim(void)
+{
+    return IRQ_DECLINE;
+}
-/** Standard input character device. */
+/** Standard input character device */
 chardev_t *stdin = NULL;
 chardev_t *stdout = &null_stdout;
+/** Initialize kernel logging facility
+ *
+ * The shared area contains kernel cyclic buffer. Userspace application may
+ * be notified on new data with indication of position and size
+ * of the data within the circular buffer.
+ */
+void klog_init(void)
+{
+    void *faddr = (void *) KA2PA(klog);
+    ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
+    ASSERT(KLOG_SIZE % FRAME_SIZE == 0);
+    devno_t devno = device_assign_devno();
+    klog_parea.pbase = (uintptr_t) faddr;
+    klog_parea.vbase = (uintptr_t) klog;
+    klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
+    klog_parea.cacheable = true;
+    ddi_parea_register(&klog_parea);
+    sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
+    sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
+    sysinfo_set_item_val("klog.devno", NULL, devno);
+    sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
+    irq_initialize(&klog_irq);
+    klog_irq.devno = devno;
+    klog_irq.inr = KLOG_VIRT_INR;
+    klog_irq.claim = klog_claim;
+    irq_register(&klog_irq);
+    spinlock_lock(&klog_lock);
+    klog_inited = true;
+    spinlock_unlock(&klog_lock);
+}
 /** Get character from character device. Do not echo character.
+ *
  * @param chardev Character device.
+ *
  * @return Character read.
          */
         if (chardev->op->read)
             return chardev->op->read(chardev);
         /* no other way of interacting with user, halt */
         if (CPU)
-            printf("cpu%d: ", CPU->id);
+            printf("cpu%u: ", CPU->id);
         else
             printf("cpu: ");
         printf("halted - no kconsole\n");
         cpu_halt();
+    }
     ch = _getc(chardev);
     putchar(ch);
     return ch;
+}
+void klog_update(void)
+{
+    spinlock_lock(&klog_lock);
+    if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
+        ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
+        klog_uspace = 0;
+    }
+    spinlock_unlock(&klog_lock);
+}
 void putchar(char c)
+{
+    spinlock_lock(&klog_lock);
+    if ((klog_stored > 0) && (stdout->op->write)) {
+        /* Print charaters stored in kernel log */
+        index_t i;
+        for (i = klog_len - klog_stored; i < klog_len; i++)
+            stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]);
+        klog_stored = 0;
+    }
+    /* Store character in the cyclic kernel log */
+    klog[(klog_start + klog_len) % KLOG_SIZE] = c;
+    if (klog_len < KLOG_SIZE)
+        klog_len++;
+    else
+        klog_start = (klog_start + 1) % KLOG_SIZE;
     if (stdout->op->write)
         stdout->op->write(stdout, c);
+    else {
+        /* The character is just in the kernel log */
+        if (klog_stored < klog_len)
+            klog_stored++;
+    }
+    /* The character is stored for uspace */
+    if (klog_uspace < klog_len)
+        klog_uspace++;
+    /* Check notify uspace to update */
+    bool update;
+    if ((klog_uspace > KLOG_LATENCY) || (c == '\n'))
+        update = true;
+    else
+        update = false;
+    spinlock_unlock(&klog_lock);
+    if (update)
+        klog_update();
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)//branches/tracing/kernel/generic/src/console/console.c – Rev 2787 → 3424