| 1 | /* |
| 2 | * debug exit port emulation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License as |
| 6 | * published by the Free Software Foundation; either version 2 or |
| 7 | * (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include "qemu/osdep.h" |
| 11 | #include "hw/isa/isa.h" |
| 12 | #include "hw/core/qdev-properties.h" |
| 13 | #include "qemu/module.h" |
| 14 | #include "qom/object.h" |
| 15 | #include "system/runstate.h" |
| 16 | |
| 17 | #define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit" |
| 18 | OBJECT_DECLARE_SIMPLE_TYPE(ISADebugExitState, ISA_DEBUG_EXIT_DEVICE) |
| 19 | |
| 20 | struct ISADebugExitState { |
| 21 | ISADevice parent_obj; |
| 22 | |
| 23 | uint32_t iobase; |
| 24 | uint32_t iosize; |
| 25 | MemoryRegion io; |
| 26 | }; |
| 27 | |
| 28 | static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size) |
| 29 | { |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val, |
| 34 | unsigned width) |
| 35 | { |
| 36 | qemu_system_shutdown_request_with_code(SHUTDOWN_CAUSE_GUEST_SHUTDOWN, |
| 37 | (val << 1) | 1); |
| 38 | } |
| 39 | |
| 40 | static const MemoryRegionOps debug_exit_ops = { |
| 41 | .read = debug_exit_read, |
| 42 | .write = debug_exit_write, |
| 43 | .valid.min_access_size = 1, |
| 44 | .valid.max_access_size = 4, |
| 45 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 46 | }; |
| 47 | |
| 48 | static void debug_exit_realizefn(DeviceState *d, Error **errp) |
| 49 | { |
| 50 | ISADevice *dev = ISA_DEVICE(d); |
| 51 | ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d); |
| 52 | |
| 53 | memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa, |
| 54 | TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize); |
| 55 | memory_region_add_subregion(isa_address_space_io(dev), |
| 56 | isa->iobase, &isa->io); |
| 57 | } |
| 58 | |
| 59 | static const Property debug_exit_properties[] = { |
| 60 | DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501), |
| 61 | DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02), |
| 62 | }; |
| 63 | |
| 64 | static void debug_exit_class_initfn(ObjectClass *klass, const void *data) |
| 65 | { |
| 66 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 67 | |
| 68 | dc->realize = debug_exit_realizefn; |
| 69 | device_class_set_props(dc, debug_exit_properties); |
| 70 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 71 | } |
| 72 | |
| 73 | static const TypeInfo debug_exit_info = { |
| 74 | .name = TYPE_ISA_DEBUG_EXIT_DEVICE, |
| 75 | .parent = TYPE_ISA_DEVICE, |
| 76 | .instance_size = sizeof(ISADebugExitState), |
| 77 | .class_init = debug_exit_class_initfn, |
| 78 | }; |
| 79 | |
| 80 | static void debug_exit_register_types(void) |
| 81 | { |
| 82 | type_register_static(&debug_exit_info); |
| 83 | } |
| 84 | |
| 85 | type_init(debug_exit_register_types) |