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/qdev-properties.h" 13 #include "qemu/module.h" 14 15 #define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit" 16 #define ISA_DEBUG_EXIT_DEVICE(obj) \ 17 OBJECT_CHECK(ISADebugExitState, (obj), TYPE_ISA_DEBUG_EXIT_DEVICE) 18 19 typedef struct ISADebugExitState { 20 ISADevice parent_obj; 21 22 uint32_t iobase; 23 uint32_t iosize; 24 MemoryRegion io; 25 } ISADebugExitState; 26 27 static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size) 28 { 29 return 0; 30 } 31 32 static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val, 33 unsigned width) 34 { 35 exit((val << 1) | 1); 36 } 37 38 static const MemoryRegionOps debug_exit_ops = { 39 .read = debug_exit_read, 40 .write = debug_exit_write, 41 .valid.min_access_size = 1, 42 .valid.max_access_size = 4, 43 .endianness = DEVICE_LITTLE_ENDIAN, 44 }; 45 46 static void debug_exit_realizefn(DeviceState *d, Error **errp) 47 { 48 ISADevice *dev = ISA_DEVICE(d); 49 ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d); 50 51 memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa, 52 TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize); 53 memory_region_add_subregion(isa_address_space_io(dev), 54 isa->iobase, &isa->io); 55 } 56 57 static Property debug_exit_properties[] = { 58 DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501), 59 DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02), 60 DEFINE_PROP_END_OF_LIST(), 61 }; 62 63 static void debug_exit_class_initfn(ObjectClass *klass, void *data) 64 { 65 DeviceClass *dc = DEVICE_CLASS(klass); 66 67 dc->realize = debug_exit_realizefn; 68 device_class_set_props(dc, debug_exit_properties); 69 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 70 } 71 72 static const TypeInfo debug_exit_info = { 73 .name = TYPE_ISA_DEBUG_EXIT_DEVICE, 74 .parent = TYPE_ISA_DEVICE, 75 .instance_size = sizeof(ISADebugExitState), 76 .class_init = debug_exit_class_initfn, 77 }; 78 79 static void debug_exit_register_types(void) 80 { 81 type_register_static(&debug_exit_info); 82 } 83 84 type_init(debug_exit_register_types) 85