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s390/boot: replace magic string check with a bootdata flag

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The magic string "S390EP" at offset 0x10008 indicated to the decompressed
kernel that it was booted by the decompressor. Introduce a new bootdata
flag instead which conveys the same information in an explicit and
a cleaner way. But keep the magic string because it is a kernel ABI.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov
2021-03-25 12:10:56 +01:00
committed by Vasily Gorbik
parent 549abb7f36
commit 9f744abb46
3 changed files with 6 additions and 1 deletions
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2
arch/s390/include/asm/setup.h
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@@ -159,6 +159,8 @@ static inline unsigned long kaslr_offset(void)
return __kaslr_offset;
}
extern int is_full_image;
static inline u32 gen_lpswe(unsigned long addr)
{
BUILD_BUG_ON(addr > 0xfff);