/**
* 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;
/* 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();
}
/**
* 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();
}
