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authorMax Filippov <jcmvbkbc@gmail.com>2018-11-13 23:46:42 -0800
committerMax Filippov <jcmvbkbc@gmail.com>2018-11-14 00:15:32 -0800
commit40dc948f234b73497c3278875eb08a01d5854d3f (patch)
tree475126b58c8d9ba2dcd700c1f396282021ed5b23 /arch
parent0773495b1f5f1c5e23551843f87b5ff37e7af8f7 (diff)
downloadlinux-40dc948f234b73497c3278875eb08a01d5854d3f.tar.bz2
xtensa: fix boot parameters address translation
The bootloader may pass physical address of the boot parameters structure to the MMUv3 kernel in the register a2. Code in the _SetupMMU block in the arch/xtensa/kernel/head.S is supposed to map that physical address to the virtual address in the configured virtual memory layout. This code haven't been updated when additional 256+256 and 512+512 memory layouts were introduced and it may produce wrong addresses when used with these layouts. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/xtensa/kernel/head.S7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S
index 2f76118ecf62..9053a5622d2c 100644
--- a/arch/xtensa/kernel/head.S
+++ b/arch/xtensa/kernel/head.S
@@ -88,9 +88,12 @@ _SetupMMU:
initialize_mmu
#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
rsr a2, excsave1
- movi a3, 0x08000000
+ movi a3, XCHAL_KSEG_PADDR
+ bltu a2, a3, 1f
+ sub a2, a2, a3
+ movi a3, XCHAL_KSEG_SIZE
bgeu a2, a3, 1f
- movi a3, 0xd0000000
+ movi a3, XCHAL_KSEG_CACHED_VADDR
add a2, a2, a3
wsr a2, excsave1
1: