powerpc/prom: Scan reserved-ranges node for memory reservations (0962e800) · Commits · 戴 / test

arch/powerpc/kernel/prom.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -559,6 +559,33 @@ void __init early_init_dt_setup_initrd_arch(unsigned long start,
		}
		#endif

		static bool __init early_reserve_mem_dt(void)
		{
		unsigned long i, len, dt_root;
		const __be32 *prop;

		dt_root = of_get_flat_dt_root();

		prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);

		if (!prop)
		return false;

		/* Each reserved range is an (address,size) pair, 2 cells each,
		* totalling 4 cells per range. */
		for (i = 0; i < len / (sizeof(prop) 4); i++) {
		u64 base, size;

		base = of_read_number(prop + (i * 4) + 0, 2);
		size = of_read_number(prop + (i * 4) + 2, 2);

		if (size)
		memblock_reserve(base, size);
		}

		return true;
		}

		static void __init early_reserve_mem(void)
		{
		u64 base, size;
		@@ -574,6 +601,14 @@ static void __init early_reserve_mem(void)
		self_size = initial_boot_params->totalsize;
		memblock_reserve(self_base, self_size);

		/*
		* Try looking for reserved-regions property in the DT first; if
		* it's present, it'll contain all of the necessary reservation
		* info
		*/
		if (early_reserve_mem_dt())
		return;

		#ifdef CONFIG_BLK_DEV_INITRD
		/* then reserve the initrd, if any */
		if (initrd_start && (initrd_end > initrd_start))