diff options
| -rw-r--r-- | arch/x86_64/boot/compressed/misc.c | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/head64.c | 7 | ||||
| -rw-r--r-- | include/asm-x86_64/page.h | 1 |
3 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86_64/boot/compressed/misc.c b/arch/x86_64/boot/compressed/misc.c index fee54dbf174..fed1167159c 100644 --- a/arch/x86_64/boot/compressed/misc.c +++ b/arch/x86_64/boot/compressed/misc.c @@ -358,7 +358,7 @@ asmlinkage void decompress_kernel(void *rmode, unsigned long heap, insize = input_len; inptr = 0; - if ((ulg)output & 0x1fffffUL) + if ((ulg)output & (__KERNEL_ALIGN - 1)) error("Destination address not 2M aligned"); if ((ulg)output >= 0xffffffffffUL) error("Destination address too large"); diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c index 6c34bdd22e2..213d90e0475 100644 --- a/arch/x86_64/kernel/head64.c +++ b/arch/x86_64/kernel/head64.c @@ -62,6 +62,13 @@ void __init x86_64_start_kernel(char * real_mode_data) { int i; + /* + * Make sure kernel is aligned to 2MB address. Catching it at compile + * time is better. Change your config file and compile the kernel + * for a 2MB aligned address (CONFIG_PHYSICAL_START) + */ + BUILD_BUG_ON(CONFIG_PHYSICAL_START & (__KERNEL_ALIGN - 1)); + /* clear bss before set_intr_gate with early_idt_handler */ clear_bss(); diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h index 40a24d0df09..b17fc16ec2e 100644 --- a/include/asm-x86_64/page.h +++ b/include/asm-x86_64/page.h @@ -78,6 +78,7 @@ extern unsigned long phys_base; #endif /* !__ASSEMBLY__ */ #define __PHYSICAL_START CONFIG_PHYSICAL_START +#define __KERNEL_ALIGN 0x200000 #define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START) #define __START_KERNEL_map 0xffffffff80000000 #define __PAGE_OFFSET 0xffff810000000000 |