The patch titled
Subject: ARM: kexec: advertise location of bootable RAM
has been added to the -mm tree. Its filename is
arm-kexec-advertise-location-of-bootable-ram.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm-kexec-advertise-location-of-bootable-ram.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm-kexec-advertise-location-of-bootable-ram.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Subject: ARM: kexec: advertise location of bootable RAM
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@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Reviewed-by: Pratyush Anand <panand@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Keerthy <j-keerthy@xxxxxx>
Cc: Vitaly Andrianov <vitalya@xxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/setup.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff -puN arch/arm/kernel/setup.c~arm-kexec-advertise-location-of-bootable-ram arch/arm/kernel/setup.c
--- a/arch/arm/kernel/setup.c~arm-kexec-advertise-location-of-bootable-ram
+++ a/arch/arm/kernel/setup.c
@@ -849,10 +849,29 @@ static void __init request_standard_reso
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);
_
Patches currently in -mm which might be from rmk+kernel@xxxxxxxxxxxxxxxx are
arm-kdump-advertise-boot-aliased-crash-kernel-resource.patch
arm-kexec-advertise-location-of-bootable-ram.patch
kexec-dont-invoke-oom-killer-for-control-page-allocation.patch
kexec-ensure-user-memory-sizes-do-not-wrap.patch
kdump-arrange-for-paddr_vmcoreinfo_note-to-return-phys_addr_t.patch
kexec-allow-architectures-to-override-boot-mapping.patch
arm-kexec-fix-kexec-for-keystone-2.patch
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