arch/loongarch/kernel/mem.c

Source file repositories/reference/linux-study-clean/arch/loongarch/kernel/mem.c

File Facts

System
Linux kernel
Corpus path
arch/loongarch/kernel/mem.c
Extension
.c
Size
1612 bytes
Lines
63
Domain
Architecture Layer
Bucket
arch/loongarch
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (mem_type) {
		case EFI_LOADER_CODE:
		case EFI_LOADER_DATA:
		case EFI_BOOT_SERVICES_CODE:
		case EFI_BOOT_SERVICES_DATA:
		case EFI_PERSISTENT_MEMORY:
		case EFI_CONVENTIONAL_MEMORY:
			memblock_add(mem_start, mem_size);
			break;
		case EFI_PAL_CODE:
		case EFI_UNUSABLE_MEMORY:
		case EFI_ACPI_RECLAIM_MEMORY:
			memblock_add(mem_start, mem_size);
			fallthrough;
		case EFI_RESERVED_TYPE:
		case EFI_RUNTIME_SERVICES_CODE:
		case EFI_RUNTIME_SERVICES_DATA:
		case EFI_MEMORY_MAPPED_IO:
		case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
			memblock_reserve(mem_start, mem_size);
			break;
		}
	}

	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
	max_low_pfn = min(PFN_DOWN(HIGHMEM_START), max_pfn);
	memblock_set_current_limit(PFN_PHYS(max_low_pfn));

	/* Reserve the first 2MB */
	memblock_reserve(PHYS_OFFSET, 0x200000);

	/* Reserve the kernel text/data/bss */
	memblock_reserve(__pa_symbol(&_text),
			 __pa_symbol(&_end) - __pa_symbol(&_text));

	memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
	memblock_set_node(0, PHYS_ADDR_MAX, &memblock.reserved, 0);
}

Annotation

Implementation Notes