1 /* 2 * Arm M-profile RAS (Reliability, Availability and Serviceability) block 3 * 4 * Copyright (c) 2021 Linaro Limited 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 or 8 * (at your option) any later version. 9 */ 10 11 #include "qemu/osdep.h" 12 #include "hw/misc/armv7m_ras.h" 13 #include "qemu/log.h" 14 15 static MemTxResult ras_read(void *opaque, hwaddr addr, 16 uint64_t *data, unsigned size, 17 MemTxAttrs attrs) 18 { 19 if (attrs.user) { 20 return MEMTX_ERROR; 21 } 22 23 switch (addr) { 24 case 0xe10: /* ERRIIDR */ 25 /* architect field = Arm; product/variant/revision 0 */ 26 *data = 0x43b; 27 break; 28 case 0xfc8: /* ERRDEVID */ 29 /* Minimal RAS: we implement 0 error record indexes */ 30 *data = 0; 31 break; 32 default: 33 qemu_log_mask(LOG_UNIMP, "Read RAS register offset 0x%x\n", 34 (uint32_t)addr); 35 *data = 0; 36 break; 37 } 38 return MEMTX_OK; 39 } 40 41 static MemTxResult ras_write(void *opaque, hwaddr addr, 42 uint64_t value, unsigned size, 43 MemTxAttrs attrs) 44 { 45 if (attrs.user) { 46 return MEMTX_ERROR; 47 } 48 49 switch (addr) { 50 default: 51 qemu_log_mask(LOG_UNIMP, "Write to RAS register offset 0x%x\n", 52 (uint32_t)addr); 53 break; 54 } 55 return MEMTX_OK; 56 } 57 58 static const MemoryRegionOps ras_ops = { 59 .read_with_attrs = ras_read, 60 .write_with_attrs = ras_write, 61 .endianness = DEVICE_NATIVE_ENDIAN, 62 }; 63 64 65 static void armv7m_ras_init(Object *obj) 66 { 67 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 68 ARMv7MRAS *s = ARMV7M_RAS(obj); 69 70 memory_region_init_io(&s->iomem, obj, &ras_ops, 71 s, "armv7m-ras", 0x1000); 72 sysbus_init_mmio(sbd, &s->iomem); 73 } 74 75 static void armv7m_ras_class_init(ObjectClass *klass, void *data) 76 { 77 /* This device has no state: no need for vmstate or reset */ 78 } 79 80 static const TypeInfo armv7m_ras_info = { 81 .name = TYPE_ARMV7M_RAS, 82 .parent = TYPE_SYS_BUS_DEVICE, 83 .instance_size = sizeof(ARMv7MRAS), 84 .instance_init = armv7m_ras_init, 85 .class_init = armv7m_ras_class_init, 86 }; 87 88 static void armv7m_ras_register_types(void) 89 { 90 type_register_static(&armv7m_ras_info); 91 } 92 93 type_init(armv7m_ras_register_types); 94