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Commit 1570f0d7 authored by Mark Salter's avatar Mark Salter Committed by Linus Torvalds
Browse files

arm64: support initrd outside kernel linear map 



The use of mem= could leave part or all of the initrd outside of the
kernel linear map.  This will lead to an error when unpacking the initrd
and a probable failure to boot.  This patch catches that situation and
relocates the initrd to be fully within the linear map.

Signed-off-by: default avatarMark Salter <msalter@redhat.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6b0f68e3

arch/arm64/kernel/setup.c

+62 −0
Original line number Diff line number Diff line
@@ -339,6 +339,67 @@ static void __init request_standard_resources(void) 
	}

}



#ifdef CONFIG_BLK_DEV_INITRD

/*

 * Relocate initrd if it is not completely within the linear mapping.

 * This would be the case if mem= cuts out all or part of it.

 */

static void __init relocate_initrd(void)

{

	phys_addr_t orig_start = __virt_to_phys(initrd_start);

	phys_addr_t orig_end = __virt_to_phys(initrd_end);

	phys_addr_t ram_end = memblock_end_of_DRAM();

	phys_addr_t new_start;

	unsigned long size, to_free = 0;

	void *dest;



	if (orig_end <= ram_end)

		return;



	/*

	 * Any of the original initrd which overlaps the linear map should

	 * be freed after relocating.

	 */

	if (orig_start < ram_end)

		to_free = ram_end - orig_start;



	size = orig_end - orig_start;



	/* initrd needs to be relocated completely inside linear mapping */

	new_start = memblock_find_in_range(0, PFN_PHYS(max_pfn),

					   size, PAGE_SIZE);

	if (!new_start)

		panic("Cannot relocate initrd of size %ld\n", size);

	memblock_reserve(new_start, size);



	initrd_start = __phys_to_virt(new_start);

	initrd_end   = initrd_start + size;



	pr_info("Moving initrd from [%llx-%llx] to [%llx-%llx]\n",

		orig_start, orig_start + size - 1,

		new_start, new_start + size - 1);



	dest = (void *)initrd_start;



	if (to_free) {

		memcpy(dest, (void *)__phys_to_virt(orig_start), to_free);

		dest += to_free;

	}



	copy_from_early_mem(dest, orig_start + to_free, size - to_free);



	if (to_free) {

		pr_info("Freeing original RAMDISK from [%llx-%llx]\n",

			orig_start, orig_start + to_free - 1);

		memblock_free(orig_start, to_free);

	}

}

#else

static inline void __init relocate_initrd(void)

{

}

#endif



u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };



void __init setup_arch(char **cmdline_p)
@@ -372,6 +433,7 @@ void __init setup_arch(char **cmdline_p) 
	acpi_boot_table_init();



	paging_init();

	relocate_initrd();

	request_standard_resources();



	early_ioremap_reset();