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: Catalin Marinas <catalin.marinas@arm.com>
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@ -170,7 +170,19 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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{
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base &= PAGE_MASK;
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size &= PAGE_MASK;
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size &= PAGE_MASK;
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if (base + size < PHYS_OFFSET) {
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pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
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base, base + size);
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return;
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}
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if (base < PHYS_OFFSET) {
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pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
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base, PHYS_OFFSET);
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size -= PHYS_OFFSET - base;
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base = PHYS_OFFSET;
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}
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memblock_add(base, size);
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memblock_add(base, size);
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}
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}
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