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authorbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2005-06-05 15:21:57 +0000
committerbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2005-06-05 15:21:57 +0000
commite68b9b2b10ee8874b80595d8c2d08819999543d8 (patch)
treeca87079ccad258c6897d3beca5554965e8671610 /hw/heathrow_pic.c
parentc0e564d53b8de4ec390ad632e9a6b9d401fe9ad8 (diff)
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added Heathrow PIC
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1452 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/heathrow_pic.c')
-rw-r--r--hw/heathrow_pic.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/hw/heathrow_pic.c b/hw/heathrow_pic.c
new file mode 100644
index 0000000..d65da9a
--- /dev/null
+++ b/hw/heathrow_pic.c
@@ -0,0 +1,168 @@
+/*
+ * Heathrow PIC support (standard PowerMac PIC)
+ *
+ * Copyright (c) 2005 Fabrice Bellard
+ *
+ * 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 "vl.h"
+
+//#define DEBUG
+
+typedef struct HeathrowPIC {
+ uint32_t events;
+ uint32_t mask;
+ uint32_t levels;
+ uint32_t level_triggered;
+} HeathrowPIC;
+
+struct HeathrowPICS {
+ HeathrowPIC pics[2];
+};
+
+static inline int check_irq(HeathrowPIC *pic)
+{
+ return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
+}
+
+/* update the CPU irq state */
+static void heathrow_pic_update(HeathrowPICS *s)
+{
+ if (check_irq(&s->pics[0]) || check_irq(&s->pics[1])) {
+ cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
+ } else {
+ cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
+ }
+}
+
+static void pic_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
+{
+ HeathrowPICS *s = opaque;
+ HeathrowPIC *pic;
+ unsigned int n;
+
+ value = bswap32(value);
+#ifdef DEBUG
+ printf("pic_writel: %08x: %08x\n",
+ addr, value);
+#endif
+ n = ((addr & 0xfff) - 0x10) >> 4;
+ if (n >= 2)
+ return;
+ pic = &s->pics[n];
+ switch(addr & 0xf) {
+ case 0x04:
+ pic->mask = value;
+ heathrow_pic_update(s);
+ break;
+ case 0x08:
+ /* do not reset level triggered IRQs */
+ value &= ~pic->level_triggered;
+ pic->events &= ~value;
+ heathrow_pic_update(s);
+ break;
+ default:
+ break;
+ }
+}
+
+static uint32_t pic_readl (void *opaque, target_phys_addr_t addr)
+{
+ HeathrowPICS *s = opaque;
+ HeathrowPIC *pic;
+ unsigned int n;
+ uint32_t value;
+
+ n = ((addr & 0xfff) - 0x10) >> 4;
+ if (n >= 2) {
+ value = 0;
+ } else {
+ pic = &s->pics[n];
+ switch(addr & 0xf) {
+ case 0x0:
+ value = pic->events;
+ break;
+ case 0x4:
+ value = pic->mask;
+ break;
+ case 0xc:
+ value = pic->levels;
+ break;
+ default:
+ value = 0;
+ break;
+ }
+ }
+#ifdef DEBUG
+ printf("pic_readl: %08x: %08x\n",
+ addr, value);
+#endif
+ value = bswap32(value);
+ return value;
+}
+
+static CPUWriteMemoryFunc *pic_write[] = {
+ &pic_writel,
+ &pic_writel,
+ &pic_writel,
+};
+
+static CPUReadMemoryFunc *pic_read[] = {
+ &pic_readl,
+ &pic_readl,
+ &pic_readl,
+};
+
+
+void heathrow_pic_set_irq(void *opaque, int num, int level)
+{
+ HeathrowPICS *s = opaque;
+ HeathrowPIC *pic;
+ unsigned int irq_bit;
+
+#if defined(DEBUG)
+ {
+ static int last_level[64];
+ if (last_level[num] != level) {
+ printf("set_irq: num=0x%02x level=%d\n", num, level);
+ last_level[num] = level;
+ }
+ }
+#endif
+ pic = &s->pics[1 - (num >> 5)];
+ irq_bit = 1 << (num & 0x1f);
+ if (level) {
+ pic->events |= irq_bit & ~pic->level_triggered;
+ pic->levels |= irq_bit;
+ } else {
+ pic->levels &= ~irq_bit;
+ }
+ heathrow_pic_update(s);
+}
+
+HeathrowPICS *heathrow_pic_init(int *pmem_index)
+{
+ HeathrowPICS *s;
+
+ s = qemu_mallocz(sizeof(HeathrowPICS));
+ s->pics[0].level_triggered = 0;
+ s->pics[1].level_triggered = 0x1ff00000;
+ *pmem_index = cpu_register_io_memory(0, pic_read, pic_write, s);
+ return s;
+}