ram_size);/* RAM is from 0x80000000 upwards; there is no low-memory alias for it. */memory_region_add_subregion(sysmem,0x80000000, ram);/* 0x2c000000 A15MPCore private memory region (GIC) */init_cpus(cpu_model,"a15mpcore_priv",0x2c000000, pic, vms->secure);/* A15 daughterboard...
vfio_region_mmap => memory_region_init_ram_ptr所以这里实现了两种region,一个io一个ram,后者是一种加速优化,即直接把vfio映射到用户态的设备mmio bar作为MR透给VMregion->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot, MAP_SHARED, region->vbasedev->fd, region->fd_offset + region-...
- memory_region_init_ram(&s->ram, NULL, "onenand.ram", 0xc000 << s->shift); + memory_region_init_ram(&s->ram, OBJECT(s), "onenand.ram", + 0xc000 << s->shift); vmstate_register_ram_global(&s->ram); ram = memory_region_get_ram_ptr(&s->ram); s->boot[0] = ram +...
memory_region_init_ram(isa_bios,"isa-bios", isa_bios_size); vmstate_register_ram_global(isa_bios); memory_region_add_subregion_overlap(rom_memory,0x100000- isa_bios_size, isa_bios,1);/* copy ISA rom image from top of flash memory */flash_ptr = memory_region_get_ram_ptr(flash_mem...
return mr->ops->endianness == DEVICE_LITTLE_ENDIAN; #else return mr->ops->endianness == DEVICE_BIG_ENDIAN; #endif }static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size) { if (memory_region_wrong_endianness(mr)) { ...
STM32F103的ROM段地址起始于 0x08000000,那么我们需要将RAM区地址结尾作为栈开始地址写入 0x08000000,Reset中断处理函数地址写入 0x08000004。我们使用链接脚本来定义这样的内存排布。我们常用的是GNU Linker Script格式。没接触过的朋友可能会觉得链接脚本很生疏难懂,其实大家都是这么过来的,看多了就习惯了(笑)。
pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", start, start + size); return ERR_PTR(-EEXIST); } return res; } static void release_memory_resource(struct resource *res) { if (!res) return; release_resource(res); kfree(res); } ...
/* Write to the memory region. @addr is relative to @mr; @size is * in bytes. */ void (*write)(void *opaque, target_phys_addr_t addr, uint64_t data, unsigned size); enum device_endian endianness; /* Guest-visible constraints: */ struct { ...
为了解决上述问题Power 64架构中引入了LMB(logical memory block allocator)机制,该机制为memblock的前身,通过引入两个数组region,其中一个用于描述在系统中的连续物理内存,另外一个用于跟踪记录 内存的使用情况,后来该机制被引入到sprarc内存模型中,并进一步引进变为memblock机制。
272 84 SMM Memory Region Access Control from Processor ... 273 85 Decoding Processor Requests to SMM and VGA Spaces... 273 86 Address Disposition for Inbound Transactions ... 274 87 DBI[3:0]#/Data Bit Correspondence...