| Gary Morrison | 3d7f654 | 2021-01-27 13:08:47 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2021, Arm Limited. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch.h> |
| 8 | #include <asm_macros.S> |
| 9 | #include <lib/el3_runtime/cpu_data.h> |
| 10 | |
| 11 | .global pauth_init_enable_el2 |
| 12 | .global pauth_disable_el2 |
| 13 | |
| 14 | /* ------------------------------------------------------------- |
| 15 | * File contains EL2 versions of EL3 funcs in: |
| 16 | * .../lib/extensions/pauth/pauth_helpers.S |
| 17 | * ------------------------------------------------------------- |
| 18 | */ |
| 19 | |
| 20 | /* ------------------------------------------------------------- |
| 21 | * Program APIAKey_EL1 and enable pointer authentication in EL2 |
| 22 | * ------------------------------------------------------------- |
| 23 | */ |
| 24 | func pauth_init_enable_el2 |
| 25 | stp x29, x30, [sp, #-16]! |
| 26 | |
| 27 | /* Initialize platform key */ |
| 28 | bl plat_init_apkey |
| 29 | |
| 30 | /* Program instruction key A used by the Trusted Firmware */ |
| 31 | msr APIAKeyLo_EL1, x0 |
| 32 | msr APIAKeyHi_EL1, x1 |
| 33 | |
| 34 | /* Enable pointer authentication */ |
| 35 | mrs x0, sctlr_el2 |
| 36 | orr x0, x0, #SCTLR_EnIA_BIT |
| 37 | |
| 38 | #if ENABLE_BTI |
| 39 | /* Enable PAC branch type compatibility */ |
| 40 | bic x0, x0, #SCTLR_BT_BIT |
| 41 | #endif |
| 42 | msr sctlr_el2, x0 |
| 43 | isb |
| 44 | |
| 45 | ldp x29, x30, [sp], #16 |
| 46 | ret |
| 47 | endfunc pauth_init_enable_el2 |
| 48 | |
| 49 | /* ------------------------------------------------------------- |
| 50 | * Disable pointer authentication in EL2 |
| 51 | * ------------------------------------------------------------- |
| 52 | */ |
| 53 | func pauth_disable_el2 |
| 54 | mrs x0, sctlr_el2 |
| 55 | bic x0, x0, #SCTLR_EnIA_BIT |
| 56 | msr sctlr_el2, x0 |
| 57 | isb |
| 58 | ret |
| 59 | endfunc pauth_disable_el2 |