mem.c

 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
13void __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}