| /* |
| * 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 "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "hw/hw.h" |
| #include "chardev/char-fe.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; |
| CharBackend 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%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val); |
| #endif |
| |
| /* XXX this blocks entire thread. Rewrite to use |
| * qemu_chr_fe_write and background I/O callbacks */ |
| qemu_chr_fe_write_all(&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%04" HWADDR_PRIx "\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_realize_core(DebugconState *s, Error **errp) |
| { |
| if (!qemu_chr_fe_backend_connected(&s->chr)) { |
| error_setg(errp, "Can't create debugcon device, empty char device"); |
| return; |
| } |
| |
| qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, s, NULL, true); |
| } |
| |
| static void debugcon_isa_realizefn(DeviceState *dev, Error **errp) |
| { |
| ISADevice *d = ISA_DEVICE(dev); |
| ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev); |
| DebugconState *s = &isa->state; |
| Error *err = NULL; |
| |
| debugcon_realize_core(s, &err); |
| if (err != NULL) { |
| error_propagate(errp, err); |
| return; |
| } |
| memory_region_init_io(&s->io, OBJECT(dev), &debugcon_ops, s, |
| TYPE_ISA_DEBUGCON_DEVICE, 1); |
| memory_region_add_subregion(isa_address_space_io(d), |
| isa->iobase, &s->io); |
| } |
| |
| static Property debugcon_isa_properties[] = { |
| DEFINE_PROP_UINT32("iobase", ISADebugconState, iobase, 0xe9), |
| DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr), |
| DEFINE_PROP_UINT32("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); |
| |
| dc->realize = debugcon_isa_realizefn; |
| dc->props = debugcon_isa_properties; |
| set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| } |
| |
| 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) |