1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #include <linux/efi.h> 6 #include <linux/initrd.h> 7 #include <linux/memblock.h> 8 9 #include <asm/bootinfo.h> 10 #include <asm/loongson.h> 11 #include <asm/sections.h> 12 13 void __init memblock_init(void) 14 { 15 u32 mem_type; 16 u64 mem_start, mem_size; 17 efi_memory_desc_t *md; 18 19 /* Parse memory information */ 20 for_each_efi_memory_desc(md) { 21 mem_type = md->type; 22 mem_start = md->phys_addr; 23 mem_size = md->num_pages << EFI_PAGE_SHIFT; 24 25 switch (mem_type) { 26 case EFI_LOADER_CODE: 27 case EFI_LOADER_DATA: 28 case EFI_BOOT_SERVICES_CODE: 29 case EFI_BOOT_SERVICES_DATA: 30 case EFI_PERSISTENT_MEMORY: 31 case EFI_CONVENTIONAL_MEMORY: 32 memblock_add(mem_start, mem_size); 33 break; 34 case EFI_PAL_CODE: 35 case EFI_UNUSABLE_MEMORY: 36 case EFI_ACPI_RECLAIM_MEMORY: 37 memblock_add(mem_start, mem_size); 38 fallthrough; 39 case EFI_RESERVED_TYPE: 40 case EFI_RUNTIME_SERVICES_CODE: 41 case EFI_RUNTIME_SERVICES_DATA: 42 case EFI_MEMORY_MAPPED_IO: 43 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 44 memblock_reserve(mem_start, mem_size); 45 break; 46 } 47 } 48 49 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 50 max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn); 51 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 52 53 /* Reserve the first 2MB */ 54 memblock_reserve(PHYS_OFFSET, 0x200000); 55 56 /* Reserve the kernel text/data/bss */ 57 memblock_reserve(__pa_symbol(&_text), 58 __pa_symbol(&_end) - __pa_symbol(&_text)); 59 60 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 61 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.reserved, 0); 62 } 63