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/hw.h" 12 #include "hw/isa/isa.h" 13 14 #define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit" 15 #define ISA_DEBUG_EXIT_DEVICE(obj) \ 16 OBJECT_CHECK(ISADebugExitState, (obj), TYPE_ISA_DEBUG_EXIT_DEVICE) 17 18 typedef struct ISADebugExitState { 19 ISADevice parent_obj; 20 21 uint32_t iobase; 22 uint32_t iosize; 23 MemoryRegion io; 24 } ISADebugExitState; 25 26 static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size) 27 { 28 return 0; 29 } 30 31 static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val, 32 unsigned width) 33 { 34 exit((val << 1) | 1); 35 } 36 37 static const MemoryRegionOps debug_exit_ops = { 38 .read = debug_exit_read, 39 .write = debug_exit_write, 40 .valid.min_access_size = 1, 41 .valid.max_access_size = 4, 42 .endianness = DEVICE_LITTLE_ENDIAN, 43 }; 44 45 static void debug_exit_realizefn(DeviceState *d, Error **errp) 46 { 47 ISADevice *dev = ISA_DEVICE(d); 48 ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d); 49 50 memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa, 51 TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize); 52 memory_region_add_subregion(isa_address_space_io(dev), 53 isa->iobase, &isa->io); 54 } 55 56 static Property debug_exit_properties[] = { 57 DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501), 58 DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02), 59 DEFINE_PROP_END_OF_LIST(), 60 }; 61 62 static void debug_exit_class_initfn(ObjectClass *klass, void *data) 63 { 64 DeviceClass *dc = DEVICE_CLASS(klass); 65 66 dc->realize = debug_exit_realizefn; 67 dc->props = debug_exit_properties; 68 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 69 } 70 71 static const TypeInfo debug_exit_info = { 72 .name = TYPE_ISA_DEBUG_EXIT_DEVICE, 73 .parent = TYPE_ISA_DEVICE, 74 .instance_size = sizeof(ISADebugExitState), 75 .class_init = debug_exit_class_initfn, 76 }; 77 78 static void debug_exit_register_types(void) 79 { 80 type_register_static(&debug_exit_info); 81 } 82 83 type_init(debug_exit_register_types) 84