Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| 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 { |
| 32 | CB_TAG_SERIAL = 0xf, |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 33 | CB_TAG_CBMEM_CONSOLE = 0x17, |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 34 | } cb_tag_t; |
| 35 | |
| 36 | typedef struct { |
| 37 | uint32_t tag; |
| 38 | uint32_t size; |
| 39 | union { |
| 40 | coreboot_serial_t serial; |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 41 | uint64_t uint64; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 42 | }; |
| 43 | } cb_entry_t; |
| 44 | |
| 45 | coreboot_serial_t coreboot_serial; |
| 46 | |
| 47 | /* |
| 48 | * The coreboot table is parsed before the MMU is enabled (i.e. with strongly |
| 49 | * ordered memory), so we cannot make unaligned accesses. The table entries |
| 50 | * immediately follow one another without padding, so nothing after the header |
| 51 | * is guaranteed to be naturally aligned. Therefore, we need to define safety |
| 52 | * functions that can read unaligned integers. |
| 53 | */ |
| 54 | static uint32_t read_le32(uint32_t *p) |
| 55 | { |
| 56 | uintptr_t addr = (uintptr_t)p; |
| 57 | return mmio_read_8(addr) | |
| 58 | mmio_read_8(addr + 1) << 8 | |
| 59 | mmio_read_8(addr + 2) << 16 | |
| 60 | mmio_read_8(addr + 3) << 24; |
| 61 | } |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 62 | static uint64_t read_le64(uint64_t *p) |
| 63 | { |
| 64 | return read_le32((void *)p) | (uint64_t)read_le32((void *)p + 4) << 32; |
| 65 | } |
| 66 | |
| 67 | static void expand_and_mmap(uintptr_t baseaddr, size_t size) |
| 68 | { |
| 69 | uintptr_t pageaddr = round_down(baseaddr, PAGE_SIZE); |
| 70 | size_t expanded = round_up(baseaddr - pageaddr + size, PAGE_SIZE); |
| 71 | mmap_add_region(pageaddr, pageaddr, expanded, |
| 72 | MT_MEMORY | MT_RW | MT_NS | MT_EXECUTE_NEVER); |
| 73 | } |
| 74 | |
| 75 | static void setup_cbmem_console(uintptr_t baseaddr) |
| 76 | { |
| 77 | static console_cbmc_t console; |
| 78 | assert(!console.base); /* should only have one CBMEM console */ |
| 79 | |
| 80 | /* CBMEM console structure stores its size in first header field. */ |
| 81 | uint32_t size = *(uint32_t *)baseaddr; |
| 82 | expand_and_mmap(baseaddr, size); |
| 83 | console_cbmc_register(baseaddr, &console); |
| 84 | console_set_scope(&console.console, CONSOLE_FLAG_BOOT | |
| 85 | CONSOLE_FLAG_RUNTIME | |
| 86 | CONSOLE_FLAG_CRASH); |
| 87 | } |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 88 | |
| 89 | void coreboot_table_setup(void *base) |
| 90 | { |
| 91 | cb_header_t *header = base; |
| 92 | void *ptr; |
| 93 | int i; |
| 94 | |
| 95 | if (strncmp(header->signature, "LBIO", 4)) { |
| 96 | ERROR("coreboot table signature corrupt!\n"); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | ptr = base + header->header_bytes; |
| 101 | for (i = 0; i < header->table_entries; i++) { |
| 102 | cb_entry_t *entry = ptr; |
| 103 | |
| 104 | if (ptr - base >= header->header_bytes + header->table_bytes) { |
| 105 | ERROR("coreboot table exceeds its bounds!\n"); |
| 106 | break; |
| 107 | } |
| 108 | |
| 109 | switch (read_le32(&entry->tag)) { |
| 110 | case CB_TAG_SERIAL: |
| 111 | memcpy(&coreboot_serial, &entry->serial, |
| 112 | sizeof(coreboot_serial)); |
| 113 | break; |
Julius Werner | 385176d | 2017-06-13 15:53:45 -0700 | [diff] [blame] | 114 | case CB_TAG_CBMEM_CONSOLE: |
| 115 | setup_cbmem_console(read_le64(&entry->uint64)); |
| 116 | break; |
Julius Werner | b624ae0 | 2017-06-09 15:17:15 -0700 | [diff] [blame] | 117 | default: |
| 118 | /* There are many tags TF doesn't need to care about. */ |
| 119 | break; |
| 120 | } |
| 121 | |
| 122 | ptr += read_le32(&entry->size); |
| 123 | } |
| 124 | } |