You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
89 lines
2.0 KiB
89 lines
2.0 KiB
/*
|
|
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <coreboot.h>
|
|
#include <debug.h>
|
|
#include <mmio.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* Structures describing coreboot's in-memory descriptor tables. See
|
|
* <coreboot>/src/commonlib/include/commonlib/coreboot_tables.h for
|
|
* canonical implementation.
|
|
*/
|
|
|
|
typedef struct {
|
|
char signature[4];
|
|
uint32_t header_bytes;
|
|
uint32_t header_checksum;
|
|
uint32_t table_bytes;
|
|
uint32_t table_checksum;
|
|
uint32_t table_entries;
|
|
} cb_header_t;
|
|
|
|
typedef enum {
|
|
CB_TAG_SERIAL = 0xf,
|
|
} cb_tag_t;
|
|
|
|
typedef struct {
|
|
uint32_t tag;
|
|
uint32_t size;
|
|
union {
|
|
coreboot_serial_t serial;
|
|
};
|
|
} cb_entry_t;
|
|
|
|
coreboot_serial_t coreboot_serial;
|
|
|
|
/*
|
|
* The coreboot table is parsed before the MMU is enabled (i.e. with strongly
|
|
* ordered memory), so we cannot make unaligned accesses. The table entries
|
|
* immediately follow one another without padding, so nothing after the header
|
|
* is guaranteed to be naturally aligned. Therefore, we need to define safety
|
|
* functions that can read unaligned integers.
|
|
*/
|
|
static uint32_t read_le32(uint32_t *p)
|
|
{
|
|
uintptr_t addr = (uintptr_t)p;
|
|
return mmio_read_8(addr) |
|
|
mmio_read_8(addr + 1) << 8 |
|
|
mmio_read_8(addr + 2) << 16 |
|
|
mmio_read_8(addr + 3) << 24;
|
|
}
|
|
|
|
void coreboot_table_setup(void *base)
|
|
{
|
|
cb_header_t *header = base;
|
|
void *ptr;
|
|
int i;
|
|
|
|
if (strncmp(header->signature, "LBIO", 4)) {
|
|
ERROR("coreboot table signature corrupt!\n");
|
|
return;
|
|
}
|
|
|
|
ptr = base + header->header_bytes;
|
|
for (i = 0; i < header->table_entries; i++) {
|
|
cb_entry_t *entry = ptr;
|
|
|
|
if (ptr - base >= header->header_bytes + header->table_bytes) {
|
|
ERROR("coreboot table exceeds its bounds!\n");
|
|
break;
|
|
}
|
|
|
|
switch (read_le32(&entry->tag)) {
|
|
case CB_TAG_SERIAL:
|
|
memcpy(&coreboot_serial, &entry->serial,
|
|
sizeof(coreboot_serial));
|
|
break;
|
|
default:
|
|
/* There are many tags TF doesn't need to care about. */
|
|
break;
|
|
}
|
|
|
|
ptr += read_le32(&entry->size);
|
|
}
|
|
}
|
|
|