diff options
author | Max Filippov <jcmvbkbc@gmail.com> | 2018-11-14 10:46:42 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-22 09:32:46 +0300 |
commit | 2d42bc697199fe8a27efe7b817fbbe25050bc1d5 (patch) | |
tree | 89f2415549148296b22ff4d1a4da22b07a5b73f9 /arch | |
parent | 0869341c34905b7f34b1c4e2a378bf1488f9df7c (diff) | |
download | linux-2d42bc697199fe8a27efe7b817fbbe25050bc1d5.tar.xz |
xtensa: fix boot parameters address translation
commit 40dc948f234b73497c3278875eb08a01d5854d3f upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/xtensa/kernel/head.S | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S index 288b61f080fe..64140998e117 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: |