WebSVN – HelenOS – Diff – /branches/rcu/kernel/generic/src/ipc/irq.c

 /*
  * Copyright (C) 2006 Ondrej Palkovsky
+ * Copyright (C) 2006 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * when interrupt is detected. The application may provide a simple 'top-half'
  * handler as part of its registration, which can perform simple operations
  * (read/write port/memory, add information to notification ipc message).
+ *
  * The structure of a notification message is as follows:
- * - METHOD: interrupt number
+ * - METHOD: method as registered by the SYS_IPC_REGISTER_IRQ syscall
  * - ARG1: payload modified by a 'top-half' handler
- * - ARG2: payload
+ * - ARG2: payload modified by a 'top-half' handler
- * - ARG3: payload
+ * - ARG3: payload modified by a 'top-half' handler
  * - in_phone_hash: interrupt counter (may be needed to assure correct order
  *         in multithreaded drivers)
  */
 #include <arch.h>
 #include <mm/slab.h>
 #include <errno.h>
+#include <ddi/irq.h>
 #include <ipc/ipc.h>
 #include <ipc/irq.h>
-#include <atomic.h>
 #include <syscall/copy.h>
 #include <console/console.h>
 #include <print.h>
-typedef struct {
-    SPINLOCK_DECLARE(lock);
-    answerbox_t *box;
-    irq_code_t *code;
-    atomic_t counter;
+/** Execute code associated with IRQ notification.
-} ipc_irq_t;
+ *
-static ipc_irq_t *irq_conns = NULL;
+ * @param call Notification call.
-static int irq_conns_size;
+ * @param code Top-half pseudocode.
+ */
-/* Execute code associated with IRQ notification */
 static void code_execute(call_t *call, irq_code_t *code)
+{
     int i;
     unative_t dstval = 0;
+    }
     return code;
+}
-/** Unregister task from irq */
+/** Unregister task from IRQ notification.
+ *
+ * @param box Answerbox associated with the notification.
+ * @param inr IRQ numbe.
+ * @param devno Device number.
+ */
-void ipc_irq_unregister(answerbox_t *box, int irq)
+void ipc_irq_unregister(answerbox_t *box, inr_t inr, devno_t devno)
+{
     ipl_t ipl;
-    int mq = irq + IPC_IRQ_RESERVED_VIRTUAL;
+    irq_t *irq;
     ipl = interrupts_disable();
-    spinlock_lock(&irq_conns[mq].lock);
+    irq = irq_find_and_lock(inr, devno);
+    if (irq) {
-    if (irq_conns[mq].box == box) {
+        if (irq->notif_cfg.answerbox == box) {
+            code_free(irq->notif_cfg.code);
-        irq_conns[mq].box = NULL;
+            irq->notif_cfg.code = NULL;
+            irq->notif_cfg.answerbox = NULL;
-        code_free(irq_conns[mq].code);
+            irq->notif_cfg.method = 0;
-        irq_conns[mq].code = NULL;
+            irq->notif_cfg.counter = 0;
+            spinlock_unlock(&irq->lock);
+        }
+    }
-    spinlock_unlock(&irq_conns[mq].lock);
     interrupts_restore(ipl);
+}
-/** Register an answerbox as a receiving end of interrupts notifications */
+/** Register an answerbox as a receiving end for IRQ notifications.
+ *
+ * @param box Receiving answerbox.
+ * @param inr IRQ number.
+ * @param devno Device number.
+ * @param method Method to be associated with the notification.
+ * @param ucode Uspace pointer to top-half pseudocode.
+ *
+ * @return EBADMEM, ENOENT or EEXISTS on failure or 0 on success.
+ */
+int
-int ipc_irq_register(answerbox_t *box, int irq, irq_code_t *ucode)
+ipc_irq_register(answerbox_t *box, inr_t inr, devno_t devno, unative_t method, irq_code_t *ucode)
+{
     ipl_t ipl;
     irq_code_t *code;
-    int mq = irq + IPC_IRQ_RESERVED_VIRTUAL;
-    ASSERT(irq_conns);
+    irq_t *irq;
     if (ucode) {
         code = code_from_uspace(ucode);
         if (!code)
             return EBADMEM;
     } else
         code = NULL;
     ipl = interrupts_disable();
-    spinlock_lock(&irq_conns[mq].lock);
+    irq = irq_find_and_lock(inr, devno);
+    if (!irq) {
+        interrupts_restore(ipl);
+        code_free(code);
+        return ENOENT;
+    }
-    if (irq_conns[mq].box) {
+    if (irq->notif_cfg.answerbox) {
-        spinlock_unlock(&irq_conns[mq].lock);
+        spinlock_unlock(&irq->lock);
         interrupts_restore(ipl);
         code_free(code);
         return EEXISTS;
+    }
-    irq_conns[mq].box = box;
+    irq->notif_cfg.answerbox = box;
+    irq->notif_cfg.method = method;
-    irq_conns[mq].code = code;
+    irq->notif_cfg.code = code;
-    atomic_set(&irq_conns[mq].counter, 0);
+    irq->notif_cfg.counter = 0;
-    spinlock_unlock(&irq_conns[mq].lock);
+    spinlock_unlock(&irq->lock);
     interrupts_restore(ipl);
     return 0;
+}
-/** Add call to proper answerbox queue
+/** Add call to proper answerbox queue.
+ *
+ * Assume irq->lock is locked.
+ *
- * Assume irq_conns[mq].lock is locked */
+ */
-static void send_call(int mq, call_t *call)
+static void send_call(irq_t *irq, call_t *call)
+{
-    spinlock_lock(&irq_conns[mq].box->irq_lock);
+    spinlock_lock(&irq->notif_cfg.answerbox->irq_lock);
-    list_append(&call->link, &irq_conns[mq].box->irq_notifs);
+    list_append(&call->link, &irq->notif_cfg.answerbox->irq_notifs);
-    spinlock_unlock(&irq_conns[mq].box->irq_lock);
+    spinlock_unlock(&irq->notif_cfg.answerbox->irq_lock);
-    waitq_wakeup(&irq_conns[mq].box->wq, 0);
+    waitq_wakeup(&irq->notif_cfg.answerbox->wq, WAKEUP_FIRST);
+}
 /** Send notification message
+ *
  */
-void ipc_irq_send_msg(int irq, unative_t a1, unative_t a2, unative_t a3)
+void ipc_irq_send_msg(irq_t *irq, unative_t a1, unative_t a2, unative_t a3)
+{
     call_t *call;
-    int mq = irq + IPC_IRQ_RESERVED_VIRTUAL;
-    spinlock_lock(&irq_conns[mq].lock);
+    spinlock_lock(&irq->lock);
-    if (irq_conns[mq].box) {
+    if (irq->notif_cfg.answerbox) {
         call = ipc_call_alloc(FRAME_ATOMIC);
         if (!call) {
-            spinlock_unlock(&irq_conns[mq].lock);
+            spinlock_unlock(&irq->lock);
             return;
+        }
         call->flags |= IPC_CALL_NOTIF;
-        IPC_SET_METHOD(call->data, irq);
+        IPC_SET_METHOD(call->data, irq->notif_cfg.method);
         IPC_SET_ARG1(call->data, a1);
         IPC_SET_ARG2(call->data, a2);
         IPC_SET_ARG3(call->data, a3);
         /* Put a counter to the message */
-        call->private = atomic_preinc(&irq_conns[mq].counter);
+        call->private = ++irq->notif_cfg.counter;
-        send_call(mq, call);
+        send_call(irq, call);
+    }
-    spinlock_unlock(&irq_conns[mq].lock);
+    spinlock_unlock(&irq->lock);
+}
 /** Notify task that an irq had occurred.
+ *
- * We expect interrupts to be disabled
+ * We expect interrupts to be disabled and the irq->lock already held.
  */
-void ipc_irq_send_notif(int irq)
+void ipc_irq_send_notif(irq_t *irq)
+{
     call_t *call;
-    int mq = irq + IPC_IRQ_RESERVED_VIRTUAL;
-    ASSERT(irq_conns);
+    ASSERT(irq);
-    spinlock_lock(&irq_conns[mq].lock);
-    if (irq_conns[mq].box) {
+    if (irq->notif_cfg.answerbox) {
         call = ipc_call_alloc(FRAME_ATOMIC);
         if (!call) {
-            spinlock_unlock(&irq_conns[mq].lock);
             return;
+        }
         call->flags |= IPC_CALL_NOTIF;
         /* Put a counter to the message */
-        call->private = atomic_preinc(&irq_conns[mq].counter);
+        call->private = ++irq->notif_cfg.counter;
         /* Set up args */
-        IPC_SET_METHOD(call->data, irq);
+        IPC_SET_METHOD(call->data, irq->notif_cfg.method);
         /* Execute code to handle irq */
-        code_execute(call, irq_conns[mq].code);
+        code_execute(call, irq->notif_cfg.code);
-        send_call(mq, call);
+        send_call(irq, call);
+    }
-    spinlock_unlock(&irq_conns[mq].lock);
+}
-/** Initialize table of interrupt handlers
+/** Disconnect all IRQ notifications from an answerbox.
+ *
- * @param irqcount Count of required hardware IRQs to be supported
- */
-void ipc_irq_make_table(int irqcount)
-{
-    int i;
-    irqcount +=  IPC_IRQ_RESERVED_VIRTUAL;
-    irq_conns_size = irqcount;
-    irq_conns = malloc(irqcount * (sizeof(*irq_conns)), 0);
-    for (i=0; i < irqcount; i++) {
-        spinlock_initialize(&irq_conns[i].lock, "irq_ipc_lock");
-        irq_conns[i].box = NULL;
-        irq_conns[i].code = NULL;
-    }
-}
-/** Disconnect all irq's notifications
- *
- * @todo It may be better to do some linked list, so that
- *       we wouldn't need to go through whole array every cleanup
+ * @param box Answerbox for which we want to carry out the cleanup.
  */
 void ipc_irq_cleanup(answerbox_t *box)
+{
-    int i;
-    ipl_t ipl;
+    /* TODO */
-    for (i=0; i < irq_conns_size; i++) {
-        ipl = interrupts_disable();
-        spinlock_lock(&irq_conns[i].lock);
-        if (irq_conns[i].box == box)
-            irq_conns[i].box = NULL;
-        spinlock_unlock(&irq_conns[i].lock);
-        interrupts_restore(ipl);
-    }
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)/branches/rcu/kernel/generic/src/ipc/irq.c @ 2308 – Rev 1875 → 1923