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parisc/firmware: Fix F-extend for PDC addresses 

commit 735ae74f73e55c191d48689bd11ff4a06ea0508f upstream.

When running with narrow firmware (64-bit kernel using a 32-bit
firmware), extend PDC addresses into the 0xfffffff0.00000000
region instead of the 0xf0f0f0f0.00000000 region.

This fixes the power button on the C3700 machine in qemu (64-bit CPU
with 32-bit firmware), and my assumption is that the previous code was
really never used (because most 64-bit machines have a 64-bit firmware),
or it just worked on very old machines because they may only decode
40-bit of virtual addresses.

Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2024-01-03 21:02:16 +01:00 committed by Greg Kroah-Hartman
parent 0b093176fd
commit 71602d95ae
1 changed files with 2 additions and 2 deletions
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4
arch/parisc/kernel/firmware.c
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@ -123,10 +123,10 @@ static unsigned long f_extend(unsigned long address)
#ifdef CONFIG_64BIT
if(unlikely(parisc_narrow_firmware)) {
if((address & 0xff000000) == 0xf0000000)
return 0xf0f0f0f000000000UL | (u32)address;
return (0xfffffff0UL << 32) | (u32)address;
if((address & 0xf0000000) == 0xf0000000)
return 0xffffffff00000000UL | (u32)address;
return (0xffffffffUL << 32) | (u32)address;
}
#endif
return address;