From 39f4b7bf7571a9c6529b0bb3de49c9bb0998f194 Mon Sep 17 00:00:00 2001 From: Jason Yan Date: Fri, 20 Sep 2019 17:45:37 +0800 Subject: [PATCH] powerpc: introduce kernstart_virt_addr to store the kernel base 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 Reviewed-by: Christophe Leroy Reviewed-by: Diana Craciun Tested-by: Diana Craciun Signed-off-by: Scott Wood Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/page.h | 2 ++ arch/powerpc/mm/init-common.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index c8bb14ff4713..88fa53f89f5a 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -325,6 +325,8 @@ void arch_free_page(struct page *page, int order); struct vm_area_struct; +extern unsigned long kernstart_virt_addr; + #include #endif /* __ASSEMBLY__ */ #include diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c index e223da482c0c..42ef7a6e6098 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -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);