linux-dev/arch/powerpc/kernel/rtas_entry.S, branch linus/masterLinux kernel development work - see feature brancheshttps://git.zx2c4.com/linux-dev/atom/arch/powerpc/kernel/rtas_entry.S?h=linus%2Fmaster2022-05-19T13:11:27Zpowerpc/rtas: Leave MSR[RI] enabled over RTAS call2022-05-19T13:11:27ZNicholas Pigginnpiggin@gmail.com2022-03-08T13:50:42Zurn:sha1:014b2e896cc8445fcc04636e69bf5f9e24281daa
PAPR specifies that RTAS may be called with MSR[RI] enabled if the
calling context is recoverable, and RTAS will manage RI as necessary.
Call the rtas entry point with RI enabled, and add a check to ensure
the caller has RI enabled.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-10-npiggin@gmail.com
powerpc/rtas: PACA can be restored directly from SPRG2022-05-19T13:11:27ZNicholas Pigginnpiggin@gmail.com2022-03-08T13:50:40Zurn:sha1:5c86bd02b3c3ef68a109fa7e690ad62d3091f6d4
On 64-bit, PACA is saved in a SPRG so it does not need to be saved on
stack. We also don't need to mask off the top bits for real mode
addresses because the architecture does this for us.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-8-npiggin@gmail.com
powerpc/rtas: Call enter_rtas with MSR[EE] disabled2022-05-19T13:11:27ZNicholas Pigginnpiggin@gmail.com2022-03-08T13:50:37Zurn:sha1:c5a65e0a420d50655bf692fc7386813683c0cd81
Disable MSR[EE] in C code rather than asm.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-5-npiggin@gmail.com
powerpc/rtas: Fix whitespace in rtas_entry.S2022-05-19T13:11:27ZNicholas Pigginnpiggin@gmail.com2022-03-08T13:50:36Zurn:sha1:4e949faae2bd42783a2b2b732b7bf17557d94cfb
The code was moved verbatim including whitespace cruft. Fix that.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-4-npiggin@gmail.com
powerpc/rtas: Make enter_rtas a nokprobe symbol on 64-bit2022-05-19T13:11:27ZNicholas Pigginnpiggin@gmail.com2022-03-08T13:50:35Zurn:sha1:07940b4b61cf0cbcfb9e4226c07318f737157c42
This symbol is marked nokprobe on 32-bit but not 64-bit, add it.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-3-npiggin@gmail.com
powerpc/rtas: Move rtas entry assembly into its own file2022-05-19T13:11:27ZNicholas Pigginnpiggin@gmail.com2022-03-08T13:50:34Zurn:sha1:838ee286ecc9a3c76e6bd8f5aaad0c8c5c66b9ca
This makes working on the code a bit easier.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220308135047.478297-2-npiggin@gmail.com