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Commit ba14f649 authored by Kumar Gala's avatar Kumar Gala
Browse files

powerpc: respect mem= setting for early memory limit setup 



For those MMUs that have some form of bolt'd linear mapping (TLB)
required its rare that one ever sets mem= smaller than the size of that
mapping.

However, on Book-E 64 parts the initial linear mapping is quite large
(1G) so its quite reasonable that mem= is set smaller than that.

We need to parse the command line for mem= limit and constrain the
amount of memory we map initially by it if need be.

Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent 5c4a5b8d

arch/powerpc/kernel/prom.c

+4 −1
Original line number Diff line number Diff line
@@ -737,12 +737,15 @@ void __init early_init_devtree(void *params) 


	of_scan_flat_dt(early_init_dt_scan_root, NULL);

	of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);

	setup_initial_memory_limit(memstart_addr, first_memblock_size);



	/* Save command line for /proc/cmdline and then parse parameters */

	strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);

	parse_early_param();



	/* make sure we've parsed cmdline for mem= before this */

	if (memory_limit)

		first_memblock_size = min(first_memblock_size, memory_limit);

	setup_initial_memory_limit(memstart_addr, first_memblock_size);

	/* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */

	memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);

	/* If relocatable, reserve first 32k for interrupt vectors etc. */