diff options
Diffstat (limited to 'arch/powerpc/mm/book3s32/kuep.c')
| -rw-r--r-- | arch/powerpc/mm/book3s32/kuep.c | 40 |
1 files changed, 40 insertions, 0 deletions
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); +} |