/** * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob */ void __init early_init_fdt_reserve_self(void) { if (!initial_boot_params) return; /* Reserve the dtb region */ early_init_dt_reserve_memory_arch(__pa(initial_boot_params), fdt_totalsize(initial_boot_params), 0); }
/** * early_init_fdt_scan_reserved_mem() - create reserved memory regions * * This function grabs memory from early allocator for device exclusive use * defined in device tree structures. It should be called by arch specific code * once the early allocator (i.e. memblock) has been fully activated. */ void __init early_init_fdt_scan_reserved_mem(void) { int n; u64 base, size; if (!initial_boot_params) return; /* Reserve the dtb region */ // boot_param = dtb 시작 영역(가상주소) // dtb 영역을 reserved영역으로 잡아줌. early_init_dt_reserve_memory_arch(__pa(initial_boot_params), // DTB(fdt header. structure block, ..., string block)영역 전체를 reserved 영역으로 잡아줌, fdt_totalsize(initial_boot_params), 0); /* * End Driving ... * * 2016. 05. 14. (토) 18:13:02 KST * name : sim man seop * * */ /* Sat May 21 15:36:17 KST 2016 * name : daehee * Start Driving ... * */ // DBT가 컴파일되서 바이너리로 생성되어 FDT형태로 메모리에 적재된다. /* Process header /memreserve/ fields */ for (n = 0; ; n++) { fdt_get_mem_rsv(initial_boot_params, n, &base, &size); // FDT내의 memory reservation region내에 주소와 사이즈가 있는데, 주소를 따라가서 reserved 영역으로 만들어 줌, if (!size) break; early_init_dt_reserve_memory_arch(base, size, 0); } of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); fdt_init_reserved_mem(); }
/** * early_init_fdt_scan_reserved_mem() - create reserved memory regions * * This function grabs memory from early allocator for device exclusive use * defined in device tree structures. It should be called by arch specific code * once the early allocator (i.e. memblock) has been fully activated. */ void __init early_init_fdt_scan_reserved_mem(void) { int n; u64 base, size; if (!initial_boot_params) return; /* Reserve the dtb region */ early_init_dt_reserve_memory_arch(__pa(initial_boot_params), fdt_totalsize(initial_boot_params), 0); /* Process header /memreserve/ fields */ for (n = 0; ; n++) { fdt_get_mem_rsv(initial_boot_params, n, &base, &size); if (!size) break; early_init_dt_reserve_memory_arch(base, size, 0); } of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); fdt_init_reserved_mem(); }
/** * res_mem_reserve_reg() - reserve all memory described in 'reg' property */ static int __init __reserved_mem_reserve_reg(unsigned long node, const char *uname) { int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); phys_addr_t base, size; int len; const __be32 *prop; int nomap, first = 1; prop = of_get_flat_dt_prop(node, "reg", &len); if (!prop) return -ENOENT; if (len && len % t_len != 0) { pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", uname); return -EINVAL; } nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; while (len >= t_len) { base = dt_mem_next_cell(dt_root_addr_cells, &prop); size = dt_mem_next_cell(dt_root_size_cells, &prop); if (size && early_init_dt_reserve_memory_arch(base, size, nomap) == 0) pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", uname, &base, (unsigned long)size / SZ_1M); else pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", uname, &base, (unsigned long)size / SZ_1M); len -= t_len; if (first) { fdt_reserved_mem_save_node(node, uname, base, size); first = 0; } } return 0; }