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parisc: Prevent booting 64-bit kernels on PA1.x machines

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commit a406b8b424fa01f244c1aab02ba186258448c36b upstream.

Bail out early with error message when trying to boot a 64-bit kernel on
32-bit machines. This fixes the previous commit to include the check for
true 64-bit kernels as well.

Signed-off-by: Helge Deller <deller@gmx.de>
Fixes: 591d2108f3abc ("parisc: Add runtime check to prevent PA2.0 kernels on PA1.x machines")
Cc:  <stable@vger.kernel.org> # v6.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller
2023-11-10 16:13:15 +01:00
committed by Greg Kroah-Hartman
parent c6effcdd7d
commit 064c697cac
1 changed files with 2 additions and 3 deletions
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5
arch/parisc/kernel/head.S
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@@ -69,9 +69,8 @@ $bss_loop:
stw,ma %arg2,4(%r1) stw,ma %arg2,4(%r1)
stw,ma %arg3,4(%r1) stw,ma %arg3,4(%r1)
#if !defined(CONFIG_64BIT) && defined(CONFIG_PA20) #if defined(CONFIG_PA20)
/* This 32-bit kernel was compiled for PA2.0 CPUs. Check current CPU /* check for 64-bit capable CPU as required by current kernel */
* and halt kernel if we detect a PA1.x CPU. */
ldi 32,%r10 ldi 32,%r10
mtctl %r10,%cr11 mtctl %r10,%cr11
.level 2.0 .level 2.0