diff options
Diffstat (limited to 'arch/arm64/mm/proc.S')
| -rw-r--r-- | arch/arm64/mm/proc.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index f204862314ed..1d460089f4bc 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -141,6 +141,34 @@ ENTRY(cpu_do_switch_mm) ret ENDPROC(cpu_do_switch_mm) + .pushsection ".idmap.text", "ax" +/* + * void idmap_cpu_replace_ttbr1(phys_addr_t new_pgd) + * + * This is the low-level counterpart to cpu_replace_ttbr1, and should not be + * called by anything else. It can only be executed from a TTBR0 mapping. + */ +ENTRY(idmap_cpu_replace_ttbr1) + mrs x2, daif + msr daifset, #0xf + + adrp x1, empty_zero_page + msr ttbr1_el1, x1 + isb + + tlbi vmalle1 + dsb nsh + isb + + msr ttbr1_el1, x0 + isb + + msr daif, x2 + + ret +ENDPROC(idmap_cpu_replace_ttbr1) + .popsection + /* * __cpu_setup * |