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/*
* Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <string.h>
#include <drivers/coreboot/cbmem_console.h>
#include <common/debug.h>
#include <lib/coreboot.h>
#include <lib/mmio.h>
#include <lib/xlat_tables/xlat_tables_v2.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_MEMORY = 0x1,
CB_TAG_SERIAL = 0xf,
CB_TAG_CBMEM_CONSOLE = 0x17,
} cb_tag_t;
typedef struct {
uint32_t tag;
uint32_t size;
union {
coreboot_memrange_t memranges[COREBOOT_MAX_MEMRANGES];
coreboot_serial_t serial;
uint64_t uint64;
};
} cb_entry_t;
coreboot_memrange_t coreboot_memranges[COREBOOT_MAX_MEMRANGES];
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;
}
static uint64_t read_le64(uint64_t *p)
{
return read_le32((void *)p) | (uint64_t)read_le32((void *)p + 4) << 32;
}
static void expand_and_mmap(uintptr_t baseaddr, size_t size)
{
uintptr_t pageaddr = round_down(baseaddr, PAGE_SIZE);
size_t expanded = round_up(baseaddr - pageaddr + size, PAGE_SIZE);
mmap_add_region(pageaddr, pageaddr, expanded,
MT_MEMORY | MT_RW | MT_NS | MT_EXECUTE_NEVER);
}
static void setup_cbmem_console(uintptr_t baseaddr)
{
static console_cbmc_t console;
assert(!console.console.base); /* should only have one CBMEM console */
/* CBMEM console structure stores its size in first header field. */
uint32_t size = *(uint32_t *)baseaddr;
expand_and_mmap(baseaddr, size);
console_cbmc_register(baseaddr, &console);
console_set_scope(&console.console, CONSOLE_FLAG_BOOT |
CONSOLE_FLAG_RUNTIME |
CONSOLE_FLAG_CRASH);
}
coreboot_memory_t coreboot_get_memory_type(uintptr_t start, size_t size)
{
int i;
for (i = 0; i < COREBOOT_MAX_MEMRANGES; i++) {
coreboot_memrange_t *range = &coreboot_memranges[i];
if (range->type == CB_MEM_NONE)
break; /* end of table reached */
if ((start >= range->start) &&
(start - range->start < range->size) &&
(size <= range->size - (start - range->start))) {
return range->type;
}
}
return CB_MEM_NONE;
}
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++) {
size_t size;
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_MEMORY:
size = read_le32(&entry->size) -
offsetof(cb_entry_t, memranges);
if (size > sizeof(coreboot_memranges)) {
ERROR("Need to truncate coreboot memranges!\n");
size = sizeof(coreboot_memranges);
}
memcpy(&coreboot_memranges, &entry->memranges, size);
break;
case CB_TAG_SERIAL:
memcpy(&coreboot_serial, &entry->serial,
sizeof(coreboot_serial));
break;
case CB_TAG_CBMEM_CONSOLE:
setup_cbmem_console(read_le64(&entry->uint64));
break;
default:
/* There are many tags TF doesn't need to care about. */
break;
}
ptr += read_le32(&entry->size);
}
}
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