Roberto Vargas | a1c16b6 | 2017-08-03 09:16:43 +0100 | [diff] [blame] | 1 | /* |
Roberto Vargas | 2ca18d9 | 2018-02-12 12:36:17 +0000 | [diff] [blame] | 2 | * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
Roberto Vargas | a1c16b6 | 2017-08-03 09:16:43 +0100 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <debug.h> |
| 8 | #include <mmio.h> |
| 9 | #include <norflash.h> |
| 10 | #include <plat_arm.h> |
| 11 | #include <platform_def.h> |
| 12 | #include <psci.h> |
| 13 | #include <utils.h> |
| 14 | |
Roberto Vargas | 2ca18d9 | 2018-02-12 12:36:17 +0000 | [diff] [blame] | 15 | static mem_region_t arm_ram_ranges[] = { |
Roberto Vargas | a1c16b6 | 2017-08-03 09:16:43 +0100 | [diff] [blame] | 16 | {ARM_NS_DRAM1_BASE, ARM_NS_DRAM1_SIZE}, |
Roberto Vargas | f8fda10 | 2017-08-08 11:27:20 +0100 | [diff] [blame] | 17 | #ifdef AARCH64 |
| 18 | {ARM_DRAM2_BASE, ARM_DRAM2_SIZE}, |
| 19 | #endif |
Roberto Vargas | a1c16b6 | 2017-08-03 09:16:43 +0100 | [diff] [blame] | 20 | }; |
| 21 | |
| 22 | /******************************************************************************* |
| 23 | * Function that reads the content of the memory protect variable that |
| 24 | * enables clearing of non secure memory when system boots. This variable |
| 25 | * should be stored in a secure NVRAM. |
| 26 | ******************************************************************************/ |
| 27 | int arm_psci_read_mem_protect(int *enabled) |
| 28 | { |
| 29 | int tmp; |
| 30 | |
| 31 | tmp = *(int *) PLAT_ARM_MEM_PROT_ADDR; |
| 32 | *enabled = (tmp == 1); |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | /******************************************************************************* |
| 37 | * Function that writes the content of the memory protect variable that |
| 38 | * enables overwritten of non secure memory when system boots. |
| 39 | ******************************************************************************/ |
| 40 | int arm_nor_psci_write_mem_protect(int val) |
| 41 | { |
| 42 | int enable = (val != 0); |
| 43 | |
| 44 | if (nor_unlock(PLAT_ARM_MEM_PROT_ADDR) != 0) { |
| 45 | ERROR("unlocking memory protect variable\n"); |
| 46 | return -1; |
| 47 | } |
| 48 | |
| 49 | if (enable) { |
| 50 | /* |
| 51 | * If we want to write a value different than 0 |
| 52 | * then we have to erase the full block because |
| 53 | * otherwise we cannot ensure that the value programmed |
| 54 | * into the flash is going to be the same than the value |
| 55 | * requested by the caller |
| 56 | */ |
| 57 | if (nor_erase(PLAT_ARM_MEM_PROT_ADDR) != 0) { |
| 58 | ERROR("erasing block containing memory protect variable\n"); |
| 59 | return -1; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | if (nor_word_program(PLAT_ARM_MEM_PROT_ADDR, enable) != 0) { |
| 64 | ERROR("programming memory protection variable\n"); |
| 65 | return -1; |
| 66 | } |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | /******************************************************************************* |
| 71 | * Function used for required psci operations performed when |
| 72 | * system boots |
| 73 | ******************************************************************************/ |
| 74 | void arm_nor_psci_do_mem_protect(void) |
| 75 | { |
| 76 | int enable; |
| 77 | |
| 78 | arm_psci_read_mem_protect(&enable); |
| 79 | if (!enable) |
| 80 | return; |
| 81 | INFO("PSCI: Overwritting non secure memory\n"); |
| 82 | clear_mem_regions(arm_ram_ranges, ARRAY_SIZE(arm_ram_ranges)); |
| 83 | arm_nor_psci_write_mem_protect(0); |
| 84 | } |
| 85 | |
| 86 | /******************************************************************************* |
| 87 | * Function that checks if a region is protected by the memory protect |
| 88 | * mechanism |
| 89 | ******************************************************************************/ |
| 90 | int arm_psci_mem_protect_chk(uintptr_t base, u_register_t length) |
| 91 | { |
| 92 | return mem_region_in_array_chk(arm_ram_ranges, |
| 93 | ARRAY_SIZE(arm_ram_ranges), |
| 94 | base, length); |
| 95 | } |