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authorRussell King <rmk+kernel@arm.linux.org.uk>2016-08-02 23:06:04 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-03 01:35:27 +0200
commit43546d8669d62d75fa69ca9a45d2f586665f56bd (patch)
tree3546ef2ae7ba4746671fef7bbfb8b1b3072c100a /arch/arm/include/asm/kexec.h
parentkdump: arrange for paddr_vmcoreinfo_note() to return phys_addr_t (diff)
downloadlinux-43546d8669d62d75fa69ca9a45d2f586665f56bd.tar.xz
linux-43546d8669d62d75fa69ca9a45d2f586665f56bd.zip
kexec: allow architectures to override boot mapping
kexec physical addresses are the boot-time view of the system. For certain ARM systems (such as Keystone 2), the boot view of the system does not match the kernel's view of the system: the boot view uses a special alias in the lower 4GB of the physical address space. To cater for these kinds of setups, we need to translate between the boot view physical addresses and the normal kernel view physical addresses. This patch extracts the current transation points into linux/kexec.h, and allows an architecture to override the functions. Due to the translations required, we unfortunately end up with six translation functions, which are reduced down to four that the architecture can override. [akpm@linux-foundation.org: kexec.h needs asm/io.h for phys_to_virt()] Link: http://lkml.kernel.org/r/E1b8koP-0004HZ-Vf@rmk-PC.armlinux.org.uk Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Keerthy <j-keerthy@ti.com> Cc: Pratyush Anand <panand@redhat.com> Cc: Vitaly Andrianov <vitalya@ti.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Dave Young <dyoung@redhat.com> Cc: Baoquan He <bhe@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>
Diffstat (limited to 'arch/arm/include/asm/kexec.h')
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