diff options
| -rw-r--r-- | exec.c | 34 |
1 files changed, 33 insertions, 1 deletions
@@ -2725,6 +2725,37 @@ static uint16_t dummy_section(PhysPageMap *map, FlatView *fv, MemoryRegion *mr) return phys_section_add(map, §ion); } +static void readonly_mem_write(void *opaque, hwaddr addr, + uint64_t val, unsigned size) +{ + /* Ignore any write to ROM. */ +} + +static bool readonly_mem_accepts(void *opaque, hwaddr addr, + unsigned size, bool is_write) +{ + return is_write; +} + +/* This will only be used for writes, because reads are special cased + * to directly access the underlying host ram. + */ +static const MemoryRegionOps readonly_mem_ops = { + .write = readonly_mem_write, + .valid.accepts = readonly_mem_accepts, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .min_access_size = 1, + .max_access_size = 8, + .unaligned = false, + }, + .impl = { + .min_access_size = 1, + .max_access_size = 8, + .unaligned = false, + }, +}; + MemoryRegion *iotlb_to_region(CPUState *cpu, hwaddr index, MemTxAttrs attrs) { int asidx = cpu_asidx_from_attrs(cpu, attrs); @@ -2737,7 +2768,8 @@ MemoryRegion *iotlb_to_region(CPUState *cpu, hwaddr index, MemTxAttrs attrs) static void io_mem_init(void) { - memory_region_init_io(&io_mem_rom, NULL, &unassigned_mem_ops, NULL, NULL, UINT64_MAX); + memory_region_init_io(&io_mem_rom, NULL, &readonly_mem_ops, + NULL, NULL, UINT64_MAX); memory_region_init_io(&io_mem_unassigned, NULL, &unassigned_mem_ops, NULL, NULL, UINT64_MAX); |