u-boot/common/bloblist.c

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// SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
/*
* Copyright 2018 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_DEBUG
#define LOG_CATEGORY LOGC_BLOBLIST
#include <common.h>
#include <bloblist.h>
#include <display_options.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <spl.h>
#include <asm/global_data.h>
#include <u-boot/crc.h>
/*
* A bloblist is a single contiguous chunk of memory with a header
* (struct bloblist_hdr) and a number of blobs in it.
*
* Each blob starts on a BLOBLIST_ALIGN boundary relative to the start of the
* bloblist and consists of a struct bloblist_rec, some padding to the required
* alignment for the blog and then the actual data. The padding ensures that the
* start address of the data in each blob is aligned as required. Note that
* each blob's *data* is aligned to BLOBLIST_ALIGN regardless of the alignment
* of the bloblist itself or the blob header.
*
* So far, only BLOBLIST_ALIGN alignment is supported.
*/
DECLARE_GLOBAL_DATA_PTR;
static struct tag_name {
enum bloblist_tag_t tag;
const char *name;
} tag_name[] = {
{ BLOBLISTT_NONE, "(none)" },
/* BLOBLISTT_AREA_FIRMWARE_TOP */
/* BLOBLISTT_AREA_FIRMWARE */
{ BLOBLISTT_ACPI_GNVS, "ACPI GNVS" },
{ BLOBLISTT_INTEL_VBT, "Intel Video-BIOS table" },
{ BLOBLISTT_TPM2_TCG_LOG, "TPM v2 log space" },
{ BLOBLISTT_TCPA_LOG, "TPM log space" },
{ BLOBLISTT_ACPI_TABLES, "ACPI tables for x86" },
{ BLOBLISTT_SMBIOS_TABLES, "SMBIOS tables for x86" },
{ BLOBLISTT_VBOOT_CTX, "Chrome OS vboot context" },
/* BLOBLISTT_PROJECT_AREA */
{ BLOBLISTT_U_BOOT_SPL_HANDOFF, "SPL hand-off" },
/* BLOBLISTT_VENDOR_AREA */
};
const char *bloblist_tag_name(enum bloblist_tag_t tag)
{
int i;
for (i = 0; i < ARRAY_SIZE(tag_name); i++) {
if (tag_name[i].tag == tag)
return tag_name[i].name;
}
return "invalid";
}
static struct bloblist_rec *bloblist_first_blob(struct bloblist_hdr *hdr)
{
if (hdr->alloced <= hdr->hdr_size)
return NULL;
return (struct bloblist_rec *)((void *)hdr + hdr->hdr_size);
}
static ulong bloblist_blob_end_ofs(struct bloblist_hdr *hdr,
struct bloblist_rec *rec)
{
ulong offset;
offset = (void *)rec - (void *)hdr;
offset += rec->hdr_size + ALIGN(rec->size, BLOBLIST_ALIGN);
return offset;
}
static struct bloblist_rec *bloblist_next_blob(struct bloblist_hdr *hdr,
struct bloblist_rec *rec)
{
ulong offset = bloblist_blob_end_ofs(hdr, rec);
if (offset >= hdr->alloced)
return NULL;
return (struct bloblist_rec *)((void *)hdr + offset);
}
#define foreach_rec(_rec, _hdr) \
for (_rec = bloblist_first_blob(_hdr); \
_rec; \
_rec = bloblist_next_blob(_hdr, _rec))
static struct bloblist_rec *bloblist_findrec(uint tag)
{
struct bloblist_hdr *hdr = gd->bloblist;
struct bloblist_rec *rec;
if (!hdr)
return NULL;
foreach_rec(rec, hdr) {
if (rec->tag == tag)
return rec;
}
return NULL;
}
static int bloblist_addrec(uint tag, int size, int align,
struct bloblist_rec **recp)
{
struct bloblist_hdr *hdr = gd->bloblist;
struct bloblist_rec *rec;
int data_start, new_alloced;
if (!align)
align = BLOBLIST_ALIGN;
/* Figure out where the new data will start */
data_start = map_to_sysmem(hdr) + hdr->alloced + sizeof(*rec);
/* Align the address and then calculate the offset from ->alloced */
data_start = ALIGN(data_start, align) - map_to_sysmem(hdr);
/* Calculate the new allocated total */
new_alloced = data_start + ALIGN(size, align);
if (new_alloced > hdr->size) {
log_err("Failed to allocate %x bytes size=%x, need size=%x\n",
size, hdr->size, new_alloced);
return log_msg_ret("bloblist add", -ENOSPC);
}
rec = (void *)hdr + hdr->alloced;
rec->tag = tag;
rec->hdr_size = data_start - hdr->alloced;
rec->size = size;
rec->spare = 0;
/* Zero the record data */
memset((void *)rec + rec->hdr_size, '\0', rec->size);
hdr->alloced = new_alloced;
*recp = rec;
return 0;
}
static int bloblist_ensurerec(uint tag, struct bloblist_rec **recp, int size,
int align)
{
struct bloblist_rec *rec;
rec = bloblist_findrec(tag);
if (rec) {
if (size && size != rec->size) {
*recp = rec;
return -ESPIPE;
}
} else {
int ret;
ret = bloblist_addrec(tag, size, align, &rec);
if (ret)
return ret;
}
*recp = rec;
return 0;
}
void *bloblist_find(uint tag, int size)
{
struct bloblist_rec *rec;
rec = bloblist_findrec(tag);
if (!rec)
return NULL;
if (size && size != rec->size)
return NULL;
return (void *)rec + rec->hdr_size;
}
void *bloblist_add(uint tag, int size, int align)
{
struct bloblist_rec *rec;
if (bloblist_addrec(tag, size, align, &rec))
return NULL;
return (void *)rec + rec->hdr_size;
}
int bloblist_ensure_size(uint tag, int size, int align, void **blobp)
{
struct bloblist_rec *rec;
int ret;
ret = bloblist_ensurerec(tag, &rec, size, align);
if (ret)
return ret;
*blobp = (void *)rec + rec->hdr_size;
return 0;
}
void *bloblist_ensure(uint tag, int size)
{
struct bloblist_rec *rec;
if (bloblist_ensurerec(tag, &rec, size, 0))
return NULL;
return (void *)rec + rec->hdr_size;
}
int bloblist_ensure_size_ret(uint tag, int *sizep, void **blobp)
{
struct bloblist_rec *rec;
int ret;
ret = bloblist_ensurerec(tag, &rec, *sizep, 0);
if (ret == -ESPIPE)
*sizep = rec->size;
else if (ret)
return ret;
*blobp = (void *)rec + rec->hdr_size;
return 0;
}
static int bloblist_resize_rec(struct bloblist_hdr *hdr,
struct bloblist_rec *rec,
int new_size)
{
int expand_by; /* Number of bytes to expand by (-ve to contract) */
int new_alloced; /* New value for @hdr->alloced */
ulong next_ofs; /* Offset of the record after @rec */
expand_by = ALIGN(new_size - rec->size, BLOBLIST_ALIGN);
new_alloced = ALIGN(hdr->alloced + expand_by, BLOBLIST_ALIGN);
if (new_size < 0) {
log_debug("Attempt to shrink blob size below 0 (%x)\n",
new_size);
return log_msg_ret("size", -EINVAL);
}
if (new_alloced > hdr->size) {
log_err("Failed to allocate %x bytes size=%x, need size=%x\n",
new_size, hdr->size, new_alloced);
return log_msg_ret("alloc", -ENOSPC);
}
/* Move the following blobs up or down, if this is not the last */
next_ofs = bloblist_blob_end_ofs(hdr, rec);
if (next_ofs != hdr->alloced) {
memmove((void *)hdr + next_ofs + expand_by,
(void *)hdr + next_ofs, new_alloced - next_ofs);
}
hdr->alloced = new_alloced;
/* Zero the new part of the blob */
if (expand_by > 0) {
memset((void *)rec + rec->hdr_size + rec->size, '\0',
new_size - rec->size);
}
/* Update the size of this blob */
rec->size = new_size;
return 0;
}
int bloblist_resize(uint tag, int new_size)
{
struct bloblist_hdr *hdr = gd->bloblist;
struct bloblist_rec *rec;
int ret;
rec = bloblist_findrec(tag);
if (!rec)
return log_msg_ret("find", -ENOENT);
ret = bloblist_resize_rec(hdr, rec, new_size);
if (ret)
return log_msg_ret("resize", ret);
return 0;
}
static u32 bloblist_calc_chksum(struct bloblist_hdr *hdr)
{
struct bloblist_rec *rec;
u32 chksum;
chksum = crc32(0, (unsigned char *)hdr,
offsetof(struct bloblist_hdr, chksum));
foreach_rec(rec, hdr) {
chksum = crc32(chksum, (void *)rec, rec->hdr_size);
chksum = crc32(chksum, (void *)rec + rec->hdr_size, rec->size);
}
return chksum;
}
int bloblist_new(ulong addr, uint size, uint flags)
{
struct bloblist_hdr *hdr;
if (size < sizeof(*hdr))
return log_ret(-ENOSPC);
if (addr & (BLOBLIST_ALIGN - 1))
return log_ret(-EFAULT);
hdr = map_sysmem(addr, size);
memset(hdr, '\0', sizeof(*hdr));
hdr->version = BLOBLIST_VERSION;
hdr->hdr_size = sizeof(*hdr);
hdr->flags = flags;
hdr->magic = BLOBLIST_MAGIC;
hdr->size = size;
hdr->alloced = hdr->hdr_size;
hdr->chksum = 0;
gd->bloblist = hdr;
return 0;
}
int bloblist_check(ulong addr, uint size)
{
struct bloblist_hdr *hdr;
u32 chksum;
hdr = map_sysmem(addr, sizeof(*hdr));
if (hdr->magic != BLOBLIST_MAGIC)
return log_msg_ret("Bad magic", -ENOENT);
if (hdr->version != BLOBLIST_VERSION)
return log_msg_ret("Bad version", -EPROTONOSUPPORT);
if (size && hdr->size != size)
return log_msg_ret("Bad size", -EFBIG);
chksum = bloblist_calc_chksum(hdr);
if (hdr->chksum != chksum) {
log_err("Checksum %x != %x\n", hdr->chksum, chksum);
return log_msg_ret("Bad checksum", -EIO);
}
gd->bloblist = hdr;
return 0;
}
int bloblist_finish(void)
{
struct bloblist_hdr *hdr = gd->bloblist;
hdr->chksum = bloblist_calc_chksum(hdr);
log_debug("Finished bloblist size %lx at %lx\n", (ulong)hdr->size,
(ulong)map_to_sysmem(hdr));
return 0;
}
ulong bloblist_get_base(void)
{
return map_to_sysmem(gd->bloblist);
}
ulong bloblist_get_size(void)
{
struct bloblist_hdr *hdr = gd->bloblist;
return hdr->size;
}
void bloblist_get_stats(ulong *basep, ulong *sizep, ulong *allocedp)
{
struct bloblist_hdr *hdr = gd->bloblist;
*basep = map_to_sysmem(gd->bloblist);
*sizep = hdr->size;
*allocedp = hdr->alloced;
}
static void show_value(const char *prompt, ulong value)
{
printf("%s:%*s %-5lx ", prompt, 8 - (int)strlen(prompt), "", value);
print_size(value, "\n");
}
void bloblist_show_stats(void)
{
ulong base, size, alloced;
bloblist_get_stats(&base, &size, &alloced);
printf("base: %lx\n", base);
show_value("size", size);
show_value("alloced", alloced);
show_value("free", size - alloced);
}
void bloblist_show_list(void)
{
struct bloblist_hdr *hdr = gd->bloblist;
struct bloblist_rec *rec;
printf("%-8s %8s Tag Name\n", "Address", "Size");
for (rec = bloblist_first_blob(hdr); rec;
rec = bloblist_next_blob(hdr, rec)) {
printf("%08lx %8x %4x %s\n",
(ulong)map_to_sysmem((void *)rec + rec->hdr_size),
rec->size, rec->tag, bloblist_tag_name(rec->tag));
}
}
void bloblist_reloc(void *to, uint to_size, void *from, uint from_size)
{
struct bloblist_hdr *hdr;
memcpy(to, from, from_size);
hdr = to;
hdr->size = to_size;
}
int bloblist_init(void)
{
bool fixed = IS_ENABLED(CONFIG_BLOBLIST_FIXED);
int ret = -ENOENT;
ulong addr, size;
bool expected;
/**
* We don't expect to find an existing bloblist in the first phase of
* U-Boot that runs. Also we have no way to receive the address of an
* allocated bloblist from a previous stage, so it must be at a fixed
* address.
*/
expected = fixed && !u_boot_first_phase();
if (spl_prev_phase() == PHASE_TPL && !IS_ENABLED(CONFIG_TPL_BLOBLIST))
expected = false;
if (fixed)
addr = IF_ENABLED_INT(CONFIG_BLOBLIST_FIXED,
CONFIG_BLOBLIST_ADDR);
size = CONFIG_BLOBLIST_SIZE;
if (expected) {
ret = bloblist_check(addr, size);
if (ret) {
log_warning("Expected bloblist at %lx not found (err=%d)\n",
addr, ret);
} else {
/* Get the real size, if it is not what we expected */
size = gd->bloblist->size;
}
}
if (ret) {
if (CONFIG_IS_ENABLED(BLOBLIST_ALLOC)) {
void *ptr = memalign(BLOBLIST_ALIGN, size);
if (!ptr)
return log_msg_ret("alloc", -ENOMEM);
addr = map_to_sysmem(ptr);
} else if (!fixed) {
return log_msg_ret("!fixed", ret);
}
log_debug("Creating new bloblist size %lx at %lx\n", size,
addr);
ret = bloblist_new(addr, size, 0);
} else {
log_debug("Found existing bloblist size %lx at %lx\n", size,
addr);
}
return ret;
}