diff options
| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-21 08:32:37 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-01-27 22:37:03 +1100 |
| commit | 94dd54c51a410b9ffa6356c3ed2ab0317f998ded (patch) | |
| tree | 786b3fa5323918fc302f8967f32dae0421f9c632 /arch/powerpc/kernel/fpu.S | |
| parent | powerpc/32s: Reorganise DSI handler. (diff) | |
| download | linux-dev-94dd54c51a410b9ffa6356c3ed2ab0317f998ded.tar.xz linux-dev-94dd54c51a410b9ffa6356c3ed2ab0317f998ded.zip | |
powerpc/32s: Avoid crossing page boundary while changing SRR0/1.
Trying VMAP_STACK with KVM, vmlinux was not starting.
This was due to SRR0 and SRR1 clobbered by an ISI due to
the rfi being in a different page than the mtsrr0/1:
c0003fe0 <mmu_off>:
c0003fe0: 38 83 00 54 addi r4,r3,84
c0003fe4: 7c 60 00 a6 mfmsr r3
c0003fe8: 70 60 00 30 andi. r0,r3,48
c0003fec: 4d 82 00 20 beqlr
c0003ff0: 7c 63 00 78 andc r3,r3,r0
c0003ff4: 7c 9a 03 a6 mtsrr0 r4
c0003ff8: 7c 7b 03 a6 mtsrr1 r3
c0003ffc: 7c 00 04 ac hwsync
c0004000: 4c 00 00 64 rfi
Align the 4 instruction block used to deactivate MMU to order 4,
so that the block never crosses a page boundary.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/30d2cda111b7977227fff067fa7e358440e2b3a4.1576916812.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/kernel/fpu.S')
0 files changed, 0 insertions, 0 deletions