| Andre Przywara | e776fd2 | 2013-09-19 18:06:40 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * code for switching cores into non-secure state |
| 3 | * |
| 4 | * Copyright (c) 2013 Andre Przywara <andre.przywara@linaro.org> |
| 5 | * |
| 6 | * See file CREDITS for list of people who contributed to this |
| 7 | * project. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 2 of |
| 12 | * the License, or (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 22 | * MA 02111-1307 USA |
| 23 | */ |
| 24 | |
| 25 | #include <config.h> |
| 26 | |
| 27 | /* the vector table for secure state */ |
| 28 | _monitor_vectors: |
| 29 | .word 0 /* reset */ |
| 30 | .word 0 /* undef */ |
| 31 | adr pc, _secure_monitor |
| 32 | .word 0 |
| 33 | .word 0 |
| 34 | .word 0 |
| 35 | .word 0 |
| 36 | .word 0 |
| 37 | |
| 38 | /* |
| 39 | * secure monitor handler |
| 40 | * U-boot calls this "software interrupt" in start.S |
| 41 | * This is executed on a "smc" instruction, we use a "smc #0" to switch |
| 42 | * to non-secure state. |
| 43 | * We use only r0 and r1 here, due to constraints in the caller. |
| 44 | */ |
| 45 | .align 5 |
| 46 | _secure_monitor: |
| 47 | mrc p15, 0, r1, c1, c1, 0 @ read SCR |
| 48 | bic r1, r1, #0x4e @ clear IRQ, FIQ, EA, nET bits |
| 49 | orr r1, r1, #0x31 @ enable NS, AW, FW bits |
| 50 | |
| 51 | mcr p15, 0, r1, c1, c1, 0 @ write SCR (with NS bit set) |
| 52 | |
| 53 | movs pc, lr @ return to non-secure SVC |