aboutsummaryrefslogtreecommitdiff
path: root/hw/char/debugcon.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/char/debugcon.c')
-rw-r--r--hw/char/debugcon.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/hw/char/debugcon.c b/hw/char/debugcon.c
new file mode 100644
index 0000000000..0588eebb77
--- /dev/null
+++ b/hw/char/debugcon.c
@@ -0,0 +1,134 @@
+/*
+ * QEMU Bochs-style debug console ("port E9") emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * Copyright (c) 2008 Citrix Systems, Inc.
+ * Copyright (c) Intel Corporation; author: H. Peter Anvin
+ *
+ * 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 "hw/hw.h"
+#include "char/char.h"
+#include "hw/isa/isa.h"
+#include "hw/i386/pc.h"
+
+#define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon"
+#define ISA_DEBUGCON_DEVICE(obj) \
+ OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE)
+
+//#define DEBUG_DEBUGCON
+
+typedef struct DebugconState {
+ MemoryRegion io;
+ CharDriverState *chr;
+ uint32_t readback;
+} DebugconState;
+
+typedef struct ISADebugconState {
+ ISADevice parent_obj;
+
+ uint32_t iobase;
+ DebugconState state;
+} ISADebugconState;
+
+static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val,
+ unsigned width)
+{
+ DebugconState *s = opaque;
+ unsigned char ch = val;
+
+#ifdef DEBUG_DEBUGCON
+ printf("debugcon: write addr=0x%04x val=0x%02x\n", addr, val);
+#endif
+
+ qemu_chr_fe_write(s->chr, &ch, 1);
+}
+
+
+static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width)
+{
+ DebugconState *s = opaque;
+
+#ifdef DEBUG_DEBUGCON
+ printf("debugcon: read addr=0x%04x\n", addr);
+#endif
+
+ return s->readback;
+}
+
+static const MemoryRegionOps debugcon_ops = {
+ .read = debugcon_ioport_read,
+ .write = debugcon_ioport_write,
+ .valid.min_access_size = 1,
+ .valid.max_access_size = 1,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void debugcon_init_core(DebugconState *s)
+{
+ if (!s->chr) {
+ fprintf(stderr, "Can't create debugcon device, empty char device\n");
+ exit(1);
+ }
+
+ qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s);
+}
+
+static int debugcon_isa_initfn(ISADevice *dev)
+{
+ ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev);
+ DebugconState *s = &isa->state;
+
+ debugcon_init_core(s);
+ memory_region_init_io(&s->io, &debugcon_ops, s,
+ TYPE_ISA_DEBUGCON_DEVICE, 1);
+ memory_region_add_subregion(isa_address_space_io(dev),
+ isa->iobase, &s->io);
+ return 0;
+}
+
+static Property debugcon_isa_properties[] = {
+ DEFINE_PROP_HEX32("iobase", ISADebugconState, iobase, 0xe9),
+ DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr),
+ DEFINE_PROP_HEX32("readback", ISADebugconState, state.readback, 0xe9),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void debugcon_isa_class_initfn(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
+ ic->init = debugcon_isa_initfn;
+ dc->props = debugcon_isa_properties;
+}
+
+static const TypeInfo debugcon_isa_info = {
+ .name = TYPE_ISA_DEBUGCON_DEVICE,
+ .parent = TYPE_ISA_DEVICE,
+ .instance_size = sizeof(ISADebugconState),
+ .class_init = debugcon_isa_class_initfn,
+};
+
+static void debugcon_register_types(void)
+{
+ type_register_static(&debugcon_isa_info);
+}
+
+type_init(debugcon_register_types)