Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 1 | /* |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 2 | * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved. |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 7 | #include <assert.h> |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 8 | #include <string.h> |
Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 9 | |
| 10 | #include <drivers/coreboot/cbmem_console.h> |
| 11 | #include <common/debug.h> |
| 12 | #include <lib/coreboot.h> |
| 13 | #include <lib/mmio.h> |
| 14 | #include <lib/xlat_tables/xlat_tables_v2.h> |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 15 | |
| 16 | /* |
| 17 | * Structures describing coreboot's in-memory descriptor tables. See |
| 18 | * <coreboot>/src/commonlib/include/commonlib/coreboot_tables.h for |
| 19 | * canonical implementation. |
| 20 | */ |
| 21 | |
| 22 | typedef struct { |
| 23 | char signature[4]; |
| 24 | uint32_t header_bytes; |
| 25 | uint32_t header_checksum; |
| 26 | uint32_t table_bytes; |
| 27 | uint32_t table_checksum; |
| 28 | uint32_t table_entries; |
| 29 | } cb_header_t; |
| 30 | |
| 31 | typedef enum { |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 32 | CB_TAG_MEMORY = 0x1, |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 33 | CB_TAG_SERIAL = 0xf, |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 34 | CB_TAG_CBMEM_CONSOLE = 0x17, |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 35 | } cb_tag_t; |
| 36 | |
| 37 | typedef struct { |
| 38 | uint32_t tag; |
| 39 | uint32_t size; |
| 40 | union { |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 41 | coreboot_memrange_t memranges[COREBOOT_MAX_MEMRANGES]; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 42 | coreboot_serial_t serial; |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 43 | uint64_t uint64; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 44 | }; |
| 45 | } cb_entry_t; |
| 46 | |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 47 | coreboot_memrange_t coreboot_memranges[COREBOOT_MAX_MEMRANGES]; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 48 | coreboot_serial_t coreboot_serial; |
| 49 | |
| 50 | /* |
| 51 | * The coreboot table is parsed before the MMU is enabled (i.e. with strongly |
| 52 | * ordered memory), so we cannot make unaligned accesses. The table entries |
| 53 | * immediately follow one another without padding, so nothing after the header |
| 54 | * is guaranteed to be naturally aligned. Therefore, we need to define safety |
| 55 | * functions that can read unaligned integers. |
| 56 | */ |
| 57 | static uint32_t read_le32(uint32_t *p) |
| 58 | { |
| 59 | uintptr_t addr = (uintptr_t)p; |
| 60 | return mmio_read_8(addr) | |
| 61 | mmio_read_8(addr + 1) << 8 | |
| 62 | mmio_read_8(addr + 2) << 16 | |
| 63 | mmio_read_8(addr + 3) << 24; |
| 64 | } |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 65 | static uint64_t read_le64(uint64_t *p) |
| 66 | { |
| 67 | return read_le32((void *)p) | (uint64_t)read_le32((void *)p + 4) << 32; |
| 68 | } |
| 69 | |
| 70 | static void expand_and_mmap(uintptr_t baseaddr, size_t size) |
| 71 | { |
| 72 | uintptr_t pageaddr = round_down(baseaddr, PAGE_SIZE); |
| 73 | size_t expanded = round_up(baseaddr - pageaddr + size, PAGE_SIZE); |
| 74 | mmap_add_region(pageaddr, pageaddr, expanded, |
| 75 | MT_MEMORY | MT_RW | MT_NS | MT_EXECUTE_NEVER); |
| 76 | } |
| 77 | |
| 78 | static void setup_cbmem_console(uintptr_t baseaddr) |
| 79 | { |
| 80 | static console_cbmc_t console; |
Andre Przywara | c2f8d6d | 2020-01-25 01:07:19 +0000 | [diff] [blame] | 81 | assert(!console.console.base); /* should only have one CBMEM console */ |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 82 | |
| 83 | /* CBMEM console structure stores its size in first header field. */ |
| 84 | uint32_t size = *(uint32_t *)baseaddr; |
| 85 | expand_and_mmap(baseaddr, size); |
| 86 | console_cbmc_register(baseaddr, &console); |
| 87 | console_set_scope(&console.console, CONSOLE_FLAG_BOOT | |
| 88 | CONSOLE_FLAG_RUNTIME | |
| 89 | CONSOLE_FLAG_CRASH); |
| 90 | } |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 91 | |
Saurabh Gorecha | 86f7fb7 | 2020-10-15 00:05:36 +0530 | [diff] [blame] | 92 | coreboot_memory_t coreboot_get_memory_type(uintptr_t start, size_t size) |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 93 | { |
| 94 | int i; |
| 95 | |
| 96 | for (i = 0; i < COREBOOT_MAX_MEMRANGES; i++) { |
| 97 | coreboot_memrange_t *range = &coreboot_memranges[i]; |
| 98 | |
| 99 | if (range->type == CB_MEM_NONE) |
| 100 | break; /* end of table reached */ |
Saurabh Gorecha | 86f7fb7 | 2020-10-15 00:05:36 +0530 | [diff] [blame] | 101 | if ((start >= range->start) && |
| 102 | (start - range->start < range->size) && |
| 103 | (size <= range->size - (start - range->start))) { |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 104 | return range->type; |
Saurabh Gorecha | 86f7fb7 | 2020-10-15 00:05:36 +0530 | [diff] [blame] | 105 | } |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | return CB_MEM_NONE; |
| 109 | } |
| 110 | |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 111 | void coreboot_table_setup(void *base) |
| 112 | { |
| 113 | cb_header_t *header = base; |
| 114 | void *ptr; |
| 115 | int i; |
| 116 | |
| 117 | if (strncmp(header->signature, "LBIO", 4)) { |
| 118 | ERROR("coreboot table signature corrupt!\n"); |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | ptr = base + header->header_bytes; |
| 123 | for (i = 0; i < header->table_entries; i++) { |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 124 | size_t size; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 125 | cb_entry_t *entry = ptr; |
| 126 | |
| 127 | if (ptr - base >= header->header_bytes + header->table_bytes) { |
| 128 | ERROR("coreboot table exceeds its bounds!\n"); |
| 129 | break; |
| 130 | } |
| 131 | |
| 132 | switch (read_le32(&entry->tag)) { |
Julius Werner | 8acc493 | 2020-03-26 18:06:21 -0700 | [diff] [blame] | 133 | case CB_TAG_MEMORY: |
| 134 | size = read_le32(&entry->size) - |
| 135 | offsetof(cb_entry_t, memranges); |
| 136 | if (size > sizeof(coreboot_memranges)) { |
| 137 | ERROR("Need to truncate coreboot memranges!\n"); |
| 138 | size = sizeof(coreboot_memranges); |
| 139 | } |
| 140 | memcpy(&coreboot_memranges, &entry->memranges, size); |
| 141 | break; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 142 | case CB_TAG_SERIAL: |
| 143 | memcpy(&coreboot_serial, &entry->serial, |
| 144 | sizeof(coreboot_serial)); |
| 145 | break; |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 146 | case CB_TAG_CBMEM_CONSOLE: |
| 147 | setup_cbmem_console(read_le64(&entry->uint64)); |
| 148 | break; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 149 | default: |
| 150 | /* There are many tags TF doesn't need to care about. */ |
| 151 | break; |
| 152 | } |
| 153 | |
| 154 | ptr += read_le32(&entry->size); |
| 155 | } |
| 156 | } |