ARM: kexec: advertise location of bootable RAM (966fab00) · Commits · 戴 / test

Advertise the location of bootable RAM to kexec-tools. kexec needs to know where it can place the kernel in RAM, and so be executable when the system needs to jump into it. Advertise these areas in /proc/iomem with a "System RAM (boot alias)" tag. Link: http://lkml.kernel.org/r/E1b8ko4-0004HA-GF@rmk-PC.armlinux.org.uk Signed-off-by:

Russell King <rmk+kernel@arm.linux.org.uk> Reviewed-by:

Pratyush Anand <panand@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Keerthy <j-keerthy@ti.com> Cc: Vitaly Andrianov <vitalya@ti.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Dave Young <dyoung@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Simon Horman <horms@verge.net.au> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

arch/arm/kernel/setup.c

+21 −2

Original line number	Diff line number	Diff line
		@@ -848,10 +848,29 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
		kernel_data.end = virt_to_phys(_end - 1);

		for_each_memblock(memory, region) {
		phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
		phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
		unsigned long boot_alias_start;

		/*
		* Some systems have a special memory alias which is only
		* used for booting. We need to advertise this region to
		* kexec-tools so they know where bootable RAM is located.
		*/
		boot_alias_start = phys_to_idmap(start);
		if (arm_has_idmap_alias() && boot_alias_start != IDMAP_INVALID_ADDR) {
		res = memblock_virt_alloc(sizeof(*res), 0);
		res->name = "System RAM (boot alias)";
		res->start = boot_alias_start;
		res->end = phys_to_idmap(end);
		res->flags = IORESOURCE_MEM \| IORESOURCE_BUSY;
		request_resource(&iomem_resource, res);
		}

		res = memblock_virt_alloc(sizeof(*res), 0);
		res->name = "System RAM";
		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
		res->start = start;
		res->end = end;
		res->flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;

		request_resource(&iomem_resource, res);

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