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powerpc: introduce kernstart_virt_addr to store the kernel base

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Now the kernel base is a fixed value - KERNELBASE. To support KASLR, we
need a variable to store the kernel base.

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Diana Craciun <diana.craciun@nxp.com>
Tested-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Scott Wood <oss@buserror.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Jason Yan 2019-09-20 17:45:37 +08:00 committed by Michael Ellerman
parent 4ed47dbefa
commit 39f4b7bf75
2 changed files with 4 additions and 0 deletions
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2
arch/powerpc/include/asm/page.h
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@ -325,6 +325,8 @@ void arch_free_page(struct page *page, int order);
struct vm_area_struct;
extern unsigned long kernstart_virt_addr;
#include <asm-generic/memory_model.h>
#endif /* __ASSEMBLY__ */
#include <asm/slice.h>

2
arch/powerpc/mm/init-common.c
View file

@ -25,6 +25,8 @@ phys_addr_t memstart_addr __ro_after_init = (phys_addr_t)~0ull;
EXPORT_SYMBOL_GPL(memstart_addr);
phys_addr_t kernstart_addr __ro_after_init;
EXPORT_SYMBOL_GPL(kernstart_addr);
unsigned long kernstart_virt_addr __ro_after_init = KERNELBASE;
EXPORT_SYMBOL_GPL(kernstart_virt_addr);
static bool disable_kuep = !IS_ENABLED(CONFIG_PPC_KUEP);
static bool disable_kuap = !IS_ENABLED(CONFIG_PPC_KUAP);