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>

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 48ffb9f..7665a9b 100644 (file)
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -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);
 }