diff options
Diffstat (limited to 'arch/arm64/include/asm/mmu_context.h')
| -rw-r--r-- | arch/arm64/include/asm/mmu_context.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index 944f2730a940..a00f7cf35bbd 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -127,6 +127,25 @@ static inline void cpu_install_idmap(void) } /* + * Atomically replaces the active TTBR1_EL1 PGD with a new VA-compatible PGD, + * avoiding the possibility of conflicting TLB entries being allocated. + */ +static inline void cpu_replace_ttbr1(pgd_t *pgd) +{ + typedef void (ttbr_replace_func)(phys_addr_t); + extern ttbr_replace_func idmap_cpu_replace_ttbr1; + ttbr_replace_func *replace_phys; + + phys_addr_t pgd_phys = virt_to_phys(pgd); + + replace_phys = (void *)virt_to_phys(idmap_cpu_replace_ttbr1); + + cpu_install_idmap(); + replace_phys(pgd_phys); + cpu_uninstall_idmap(); +} + +/* * It would be nice to return ASIDs back to the allocator, but unfortunately * that introduces a race with a generation rollover where we could erroneously * free an ASID allocated in a future generation. We could workaround this by |