Syborg (Symbian Virtual Platform) board

A virtual reference platform for SymbianOS development/debugging.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 227 insertions, 0 deletions

diff --git a/hw/syborg_interrupt.c b/hw/syborg_interrupt.c
new file mode 100644
index 000000000..e3fbbf7bf
--- /dev/null
+++ b/hw/syborg_interrupt.c
@@ -0,0 +1,227 @@
+/*
+ * Syborg interrupt controller.
+ *
+ * Copyright (c) 2008 CodeSourcery
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "sysbus.h"
+#include "syborg.h"
+
+//#define DEBUG_SYBORG_INT
+
+#ifdef DEBUG_SYBORG_INT
+#define DPRINTF(fmt, ...) \
+do { printf("syborg_int: " fmt , ## __VA_ARGS__); } while (0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__); \
+    exit(1);} while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while(0)
+#define BADF(fmt, ...) \
+do { fprintf(stderr, "syborg_int: error: " fmt , ## __VA_ARGS__);} while (0)
+#endif
+enum {
+    INT_ID            = 0,
+    INT_STATUS        = 1, /* number of pending interrupts */
+    INT_CURRENT       = 2, /* next interrupt to be serviced */
+    INT_DISABLE_ALL   = 3,
+    INT_DISABLE       = 4,
+    INT_ENABLE        = 5,
+    INT_TOTAL         = 6
+};
+
+typedef struct {
+    unsigned level:1;
+    unsigned enabled:1;
+} syborg_int_flags;
+
+typedef struct {
+    SysBusDevice busdev;
+    int pending_count;
+    int num_irqs;
+    syborg_int_flags *flags;
+    qemu_irq parent_irq;
+} SyborgIntState;
+
+static void syborg_int_update(SyborgIntState *s)
+{
+    DPRINTF("pending %d\n", s->pending_count);
+    qemu_set_irq(s->parent_irq, s->pending_count > 0);
+}
+
+static void syborg_int_set_irq(void *opaque, int irq, int level)
+{
+    SyborgIntState *s = (SyborgIntState *)opaque;
+
+    if (s->flags[irq].level == level)
+        return;
+
+    s->flags[irq].level = level;
+    if (s->flags[irq].enabled) {
+        if (level)
+            s->pending_count++;
+        else
+            s->pending_count--;
+        syborg_int_update(s);
+    }
+}
+
+static uint32_t syborg_int_read(void *opaque, target_phys_addr_t offset)
+{
+    SyborgIntState *s = (SyborgIntState *)opaque;
+    int i;
+
+    offset &= 0xfff;
+    switch (offset >> 2) {
+    case INT_ID:
+        return SYBORG_ID_INT;
+    case INT_STATUS:
+        DPRINTF("read status=%d\n", s->pending_count);
+        return s->pending_count;
+
+    case INT_CURRENT:
+        for (i = 0; i < s->num_irqs; i++) {
+            if (s->flags[i].level & s->flags[i].enabled) {
+                DPRINTF("read current=%d\n", i);
+                return i;
+            }
+        }
+        DPRINTF("read current=none\n");
+        return 0xffffffffu;
+
+    default:
+        cpu_abort(cpu_single_env, "syborg_int_read: Bad offset %x\n",
+                  (int)offset);
+        return 0;
+    }
+}
+
+static void syborg_int_write(void *opaque, target_phys_addr_t offset, uint32_t value)
+{
+    SyborgIntState *s = (SyborgIntState *)opaque;
+    int i;
+    offset &= 0xfff;
+
+    DPRINTF("syborg_int_write offset=%d val=%d\n", (int)offset, (int)value);
+    switch (offset >> 2) {
+    case INT_DISABLE_ALL:
+        s->pending_count = 0;
+        for (i = 0; i < s->num_irqs; i++)
+            s->flags[i].enabled = 0;
+        break;
+
+    case INT_DISABLE:
+        if (value >= s->num_irqs)
+            break;
+        if (s->flags[value].enabled) {
+            if (s->flags[value].enabled)
+                s->pending_count--;
+            s->flags[value].enabled = 0;
+        }
+        break;
+
+    case INT_ENABLE:
+      if (value >= s->num_irqs)
+          break;
+      if (!(s->flags[value].enabled)) {
+          if(s->flags[value].level)
+              s->pending_count++;
+          s->flags[value].enabled = 1;
+      }
+      break;
+
+    default:
+        cpu_abort(cpu_single_env, "syborg_int_write: Bad offset %x\n",
+                  (int)offset);
+        return;
+    }
+    syborg_int_update(s);
+}
+
+static CPUReadMemoryFunc *syborg_int_readfn[] = {
+    syborg_int_read,
+    syborg_int_read,
+    syborg_int_read
+};
+
+static CPUWriteMemoryFunc *syborg_int_writefn[] = {
+    syborg_int_write,
+    syborg_int_write,
+    syborg_int_write
+};
+
+static void syborg_int_save(QEMUFile *f, void *opaque)
+{
+    SyborgIntState *s = (SyborgIntState *)opaque;
+    int i;
+
+    qemu_put_be32(f, s->num_irqs);
+    qemu_put_be32(f, s->pending_count);
+    for (i = 0; i < s->num_irqs; i++) {
+        qemu_put_be32(f, s->flags[i].enabled
+                         | ((unsigned)s->flags[i].level << 1));
+    }
+}
+
+static int syborg_int_load(QEMUFile *f, void *opaque, int version_id)
+{
+    SyborgIntState *s = (SyborgIntState *)opaque;
+    uint32_t val;
+    int i;
+
+    if (version_id != 1)
+        return -EINVAL;
+
+    val = qemu_get_be32(f);
+    if (val != s->num_irqs)
+        return -EINVAL;
+    s->pending_count = qemu_get_be32(f);
+    for (i = 0; i < s->num_irqs; i++) {
+        val = qemu_get_be32(f);
+        s->flags[i].enabled = val & 1;
+        s->flags[i].level = (val >> 1) & 1;
+    }
+    return 0;
+}
+
+static void syborg_int_init(SysBusDevice *dev)
+{
+    SyborgIntState *s = FROM_SYSBUS(SyborgIntState, dev);
+    int iomemtype;
+
+    sysbus_init_irq(dev, &s->parent_irq);
+    s->num_irqs = qdev_get_prop_int(&dev->qdev, "num-interrupts", 64);
+    qdev_init_irq_sink(&dev->qdev, syborg_int_set_irq, s->num_irqs);
+    iomemtype = cpu_register_io_memory(0, syborg_int_readfn,
+                                       syborg_int_writefn, s);
+    sysbus_init_mmio(dev, 0x1000, iomemtype);
+    s->flags = qemu_mallocz(s->num_irqs * sizeof(syborg_int_flags));
+
+    register_savevm("syborg_int", -1, 1, syborg_int_save, syborg_int_load, s);
+}
+
+static void syborg_interrupt_register_devices(void)
+{
+    sysbus_register_dev("syborg,interrupt", sizeof(SyborgIntState),
+                        syborg_int_init);
+}
+
+device_init(syborg_interrupt_register_devices)