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 #include "qom/object.h" 15 16 #define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit" 17 typedef struct ISADebugExitState ISADebugExitState; 18 DECLARE_INSTANCE_CHECKER(ISADebugExitState, ISA_DEBUG_EXIT_DEVICE, 19 TYPE_ISA_DEBUG_EXIT_DEVICE) 20 21 struct ISADebugExitState { 22 ISADevice parent_obj; 23 24 uint32_t iobase; 25 uint32_t iosize; 26 MemoryRegion io; 27 }; 28 29 static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size) 30 { 31 return 0; 32 } 33 34 static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val, 35 unsigned width) 36 { 37 exit((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 Property debug_exit_properties[] = { 60 DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501), 61 DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02), 62 DEFINE_PROP_END_OF_LIST(), 63 }; 64 65 static void debug_exit_class_initfn(ObjectClass *klass, void *data) 66 { 67 DeviceClass *dc = DEVICE_CLASS(klass); 68 69 dc->realize = debug_exit_realizefn; 70 device_class_set_props(dc, debug_exit_properties); 71 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 72 } 73 74 static const TypeInfo debug_exit_info = { 75 .name = TYPE_ISA_DEBUG_EXIT_DEVICE, 76 .parent = TYPE_ISA_DEVICE, 77 .instance_size = sizeof(ISADebugExitState), 78 .class_init = debug_exit_class_initfn, 79 }; 80 81 static void debug_exit_register_types(void) 82 { 83 type_register_static(&debug_exit_info); 84 } 85 86 type_init(debug_exit_register_types) 87