| Marc Zyngier | 09659d9 | 2014-07-12 14:24:04 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013,2014 - ARM Ltd |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include <config.h> |
| 19 | #include <linux/linkage.h> |
| 20 | #include <asm/psci.h> |
| 21 | |
| 22 | .pushsection ._secure.text, "ax" |
| 23 | |
| 24 | .arch_extension sec |
| 25 | |
| 26 | .align 5 |
| 27 | .globl _psci_vectors |
| 28 | _psci_vectors: |
| 29 | b default_psci_vector @ reset |
| 30 | b default_psci_vector @ undef |
| 31 | b _smc_psci @ smc |
| 32 | b default_psci_vector @ pabort |
| 33 | b default_psci_vector @ dabort |
| 34 | b default_psci_vector @ hyp |
| 35 | b default_psci_vector @ irq |
| 36 | b psci_fiq_enter @ fiq |
| 37 | |
| 38 | ENTRY(psci_fiq_enter) |
| 39 | movs pc, lr |
| 40 | ENDPROC(psci_fiq_enter) |
| 41 | .weak psci_fiq_enter |
| 42 | |
| 43 | ENTRY(default_psci_vector) |
| 44 | movs pc, lr |
| 45 | ENDPROC(default_psci_vector) |
| 46 | .weak default_psci_vector |
| 47 | |
| 48 | ENTRY(psci_cpu_suspend) |
| 49 | ENTRY(psci_cpu_off) |
| 50 | ENTRY(psci_cpu_on) |
| 51 | ENTRY(psci_migrate) |
| 52 | mov r0, #ARM_PSCI_RET_NI @ Return -1 (Not Implemented) |
| 53 | mov pc, lr |
| 54 | ENDPROC(psci_migrate) |
| 55 | ENDPROC(psci_cpu_on) |
| 56 | ENDPROC(psci_cpu_off) |
| 57 | ENDPROC(psci_cpu_suspend) |
| 58 | .weak psci_cpu_suspend |
| 59 | .weak psci_cpu_off |
| 60 | .weak psci_cpu_on |
| 61 | .weak psci_migrate |
| 62 | |
| 63 | _psci_table: |
| 64 | .word ARM_PSCI_FN_CPU_SUSPEND |
| 65 | .word psci_cpu_suspend |
| 66 | .word ARM_PSCI_FN_CPU_OFF |
| 67 | .word psci_cpu_off |
| 68 | .word ARM_PSCI_FN_CPU_ON |
| 69 | .word psci_cpu_on |
| 70 | .word ARM_PSCI_FN_MIGRATE |
| 71 | .word psci_migrate |
| 72 | .word 0 |
| 73 | .word 0 |
| 74 | |
| 75 | _smc_psci: |
| 76 | push {r4-r7,lr} |
| 77 | |
| 78 | @ Switch to secure |
| 79 | mrc p15, 0, r7, c1, c1, 0 |
| 80 | bic r4, r7, #1 |
| 81 | mcr p15, 0, r4, c1, c1, 0 |
| 82 | isb |
| 83 | |
| 84 | adr r4, _psci_table |
| 85 | 1: ldr r5, [r4] @ Load PSCI function ID |
| 86 | ldr r6, [r4, #4] @ Load target PC |
| 87 | cmp r5, #0 @ If reach the end, bail out |
| 88 | moveq r0, #ARM_PSCI_RET_INVAL @ Return -2 (Invalid) |
| 89 | beq 2f |
| 90 | cmp r0, r5 @ If not matching, try next entry |
| 91 | addne r4, r4, #8 |
| 92 | bne 1b |
| 93 | |
| 94 | blx r6 @ Execute PSCI function |
| 95 | |
| 96 | @ Switch back to non-secure |
| 97 | 2: mcr p15, 0, r7, c1, c1, 0 |
| 98 | |
| 99 | pop {r4-r7, lr} |
| 100 | movs pc, lr @ Return to the kernel |
| 101 | |
| 102 | .popsection |