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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-05-01 22:01:09 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-05-30 14:59:51 +1000 |
| commit | f1fe5252018075e18d7f0c0e23ee173546420361 (patch) | |
| tree | 7a255b9ea0493470adfd97e4938f28be8a9738f5 /arch/powerpc/boot | |
| parent | 5ed02dbb497422bf225783f46e6eadd237d23d6b (diff) | |
| download | linux-rpi-f1fe5252018075e18d7f0c0e23ee173546420361.tar.gz linux-rpi-f1fe5252018075e18d7f0c0e23ee173546420361.tar.bz2 linux-rpi-f1fe5252018075e18d7f0c0e23ee173546420361.zip | |
powerpc/64s: Fix FIXUP_ENDIAN non-maskable interrupt reentrancy
FIXUP_ENDIAN uses SRR[01] with MSR_RI=1, which gets corrupted if there
is an interleaving system reset or machine check interrupt.
Set MSR_RI=0 before setting SRRs. The rfid will restore MSR.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/boot')
| -rw-r--r-- | arch/powerpc/boot/ppc_asm.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/powerpc/boot/ppc_asm.h b/arch/powerpc/boot/ppc_asm.h index b03373d8b386..68e388ee94fe 100644 --- a/arch/powerpc/boot/ppc_asm.h +++ b/arch/powerpc/boot/ppc_asm.h @@ -67,13 +67,15 @@ #define MSR_LE 0x0000000000000001 #define FIXUP_ENDIAN \ - tdi 0, 0, 0x48; /* Reverse endian of b . + 8 */ \ - b $+36; /* Skip trampoline if endian is good */ \ - .long 0x05009f42; /* bcl 20,31,$+4 */ \ - .long 0xa602487d; /* mflr r10 */ \ - .long 0x1c004a39; /* addi r10,r10,28 */ \ + tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \ + b $+44; /* Skip trampoline if endian is good */ \ .long 0xa600607d; /* mfmsr r11 */ \ .long 0x01006b69; /* xori r11,r11,1 */ \ + .long 0x00004039; /* li r10,0 */ \ + .long 0x6401417d; /* mtmsrd r10,1 */ \ + .long 0x05009f42; /* bcl 20,31,$+4 */ \ + .long 0xa602487d; /* mflr r10 */ \ + .long 0x14004a39; /* addi r10,r10,20 */ \ .long 0xa6035a7d; /* mtsrr0 r10 */ \ .long 0xa6037b7d; /* mtsrr1 r11 */ \ .long 0x2400004c /* rfid */ |