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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 15:50:47 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 05:22:10 +0300 |
| commit | b5efec00b671c5d7e9cb9e73a1d4925dd6ce8dcd (patch) | |
| tree | 99a5ab07a508cab6ee4943fd8b8d689b7c7c8e1a /arch/powerpc/mm/book3s32 | |
| parent | a2b3e09ae41c71d27d9b8da9baf31e0d9a97b864 (diff) | |
| download | linux-b5efec00b671c5d7e9cb9e73a1d4925dd6ce8dcd.tar.xz | |
powerpc/32s: Move KUEP locking/unlocking in C
This can be done in C, do it.
Unrolling the loop gains approx. 15% performance.
From now on, prepare_transfer_to_handler() is only for
interrupts from kernel.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4eadd873927e9a73c3d1dfe2f9497353465514cf.1615552867.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/book3s32')
| -rw-r--r-- | arch/powerpc/mm/book3s32/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s32/kuep.c | 40 |
2 files changed, 41 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s32/Makefile b/arch/powerpc/mm/book3s32/Makefile index 446d9de88ce4..7f0c8a78ba0c 100644 --- a/arch/powerpc/mm/book3s32/Makefile +++ b/arch/powerpc/mm/book3s32/Makefile @@ -9,3 +9,4 @@ endif obj-y += mmu.o mmu_context.o obj-$(CONFIG_PPC_BOOK3S_603) += nohash_low.o obj-$(CONFIG_PPC_BOOK3S_604) += hash_low.o tlb.o +obj-$(CONFIG_PPC_KUEP) += kuep.o diff --git a/arch/powerpc/mm/book3s32/kuep.c b/arch/powerpc/mm/book3s32/kuep.c new file mode 100644 index 000000000000..8ed1b8634839 --- /dev/null +++ b/arch/powerpc/mm/book3s32/kuep.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <asm/kup.h> +#include <asm/reg.h> +#include <asm/task_size_32.h> +#include <asm/mmu.h> + +#define KUEP_UPDATE_TWO_USER_SEGMENTS(n) do { \ + if (TASK_SIZE > ((n) << 28)) \ + mtsr(val1, (n) << 28); \ + if (TASK_SIZE > (((n) + 1) << 28)) \ + mtsr(val2, ((n) + 1) << 28); \ + val1 = (val1 + 0x222) & 0xf0ffffff; \ + val2 = (val2 + 0x222) & 0xf0ffffff; \ +} while (0) + +static __always_inline void kuep_update(u32 val) +{ + int val1 = val; + int val2 = (val + 0x111) & 0xf0ffffff; + + KUEP_UPDATE_TWO_USER_SEGMENTS(0); + KUEP_UPDATE_TWO_USER_SEGMENTS(2); + KUEP_UPDATE_TWO_USER_SEGMENTS(4); + KUEP_UPDATE_TWO_USER_SEGMENTS(6); + KUEP_UPDATE_TWO_USER_SEGMENTS(8); + KUEP_UPDATE_TWO_USER_SEGMENTS(10); + KUEP_UPDATE_TWO_USER_SEGMENTS(12); + KUEP_UPDATE_TWO_USER_SEGMENTS(14); +} + +void kuep_lock(void) +{ + kuep_update(mfsr(0) | SR_NX); +} + +void kuep_unlock(void) +{ + kuep_update(mfsr(0) & ~SR_NX); +} |