powerpc/kuap: Add a generic intermediate layer

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Make the following functions generic to all platforms.
- bad_kuap_fault()
- kuap_assert_locked()
- kuap_save_and_lock() (PPC32 only)
- kuap_kernel_restore()
- kuap_get_and_assert_locked()

And for all platforms except book3s/64
- allow_user_access()
- prevent_user_access()
- prevent_user_access_return()
- restore_user_access()

Prepend __ in front of the name of platform specific ones.

For now the generic just calls the platform specific, but
next patch will move redundant parts of specific functions
into the generic one.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/eaef143a8dae7288cd34565ffa7b49c16aee1ec3.1634627931.git.christophe.leroy@csgroup.eu

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This commit is contained in:

Christophe Leroy 2021-10-19 09:29:20 +02:00 • committed by Michael Ellerman

parent 6754862249

commit ba454f9c8e

4 changed files with 86 additions and 37 deletions

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22

arch/powerpc/include/asm/book3s/32/kup.h

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10

arch/powerpc/include/asm/book3s/64/kup.h

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71

arch/powerpc/include/asm/kup.h

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20

arch/powerpc/include/asm/nohash/32/kup-8xx.h

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