diff options
Diffstat (limited to 'arch/powerpc/include/asm/book3s/32')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/32/kup.h | 42 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/book3s/32/mmu-hash.h | 3 |
2 files changed, 45 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h new file mode 100644 index 000000000000..5f97c742ca71 --- /dev/null +++ b/arch/powerpc/include/asm/book3s/32/kup.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_BOOK3S_32_KUP_H +#define _ASM_POWERPC_BOOK3S_32_KUP_H + +#include <asm/book3s/32/mmu-hash.h> + +#ifdef __ASSEMBLY__ + +.macro kuep_update_sr gpr1, gpr2 /* NEVER use r0 as gpr2 due to addis */ +101: mtsrin \gpr1, \gpr2 + addi \gpr1, \gpr1, 0x111 /* next VSID */ + rlwinm \gpr1, \gpr1, 0, 0xf0ffffff /* clear VSID overflow */ + addis \gpr2, \gpr2, 0x1000 /* address of next segment */ + bdnz 101b + isync +.endm + +.macro kuep_lock gpr1, gpr2 +#ifdef CONFIG_PPC_KUEP + li \gpr1, NUM_USER_SEGMENTS + li \gpr2, 0 + mtctr \gpr1 + mfsrin \gpr1, \gpr2 + oris \gpr1, \gpr1, SR_NX@h /* set Nx */ + kuep_update_sr \gpr1, \gpr2 +#endif +.endm + +.macro kuep_unlock gpr1, gpr2 +#ifdef CONFIG_PPC_KUEP + li \gpr1, NUM_USER_SEGMENTS + li \gpr2, 0 + mtctr \gpr1 + mfsrin \gpr1, \gpr2 + rlwinm \gpr1, \gpr1, 0, ~SR_NX /* Clear Nx */ + kuep_update_sr \gpr1, \gpr2 +#endif +.endm + +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_POWERPC_BOOK3S_32_KUP_H */ diff --git a/arch/powerpc/include/asm/book3s/32/mmu-hash.h b/arch/powerpc/include/asm/book3s/32/mmu-hash.h index 5cb588395fdc..8c5727a322b1 100644 --- a/arch/powerpc/include/asm/book3s/32/mmu-hash.h +++ b/arch/powerpc/include/asm/book3s/32/mmu-hash.h @@ -63,6 +63,9 @@ typedef pte_t *pgtable_t; #define PP_RWRW 2 /* Supervisor read/write, User read/write */ #define PP_RXRX 3 /* Supervisor read, User read */ +/* Values for Segment Registers */ +#define SR_NX 0x10000000 /* No Execute */ + #ifndef __ASSEMBLY__ /* |