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Commit f71a1a42 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: Ignore memory blocks below PHYS_OFFSET 



According to Documentation/arm64/booting.txt, the kernel image must be
loaded at a pre-defined offset from the start of RAM so that the kernel
can calculate PHYS_OFFSET based on this address. If the DT contains
memory blocks below this PHYS_OFFSET, report them and ignore the
corresponding memory range.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent c60b0c28

arch/arm64/kernel/setup.c

+12 −0
Original line number Diff line number Diff line
@@ -170,7 +170,19 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys) 


void __init early_init_dt_add_memory_arch(u64 base, u64 size)

{

	base &= PAGE_MASK;

	size &= PAGE_MASK;

	if (base + size < PHYS_OFFSET) {

		pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",

			   base, base + size);

		return;

	}

	if (base < PHYS_OFFSET) {

		pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",

			   base, PHYS_OFFSET);

		size -= PHYS_OFFSET - base;

		base = PHYS_OFFSET;

	}

	memblock_add(base, size);

}