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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <bloblist.h>
#include <log.h>
#include <mapmem.h>
#include <spl.h>
#include <u-boot/crc.h>
DECLARE_GLOBAL_DATA_PTR;
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);
}
struct bloblist_rec *bloblist_next_blob(struct bloblist_hdr *hdr,
struct bloblist_rec *rec)
{
ulong offset;
offset = (void *)rec - (void *)hdr;
offset += rec->hdr_size + ALIGN(rec->size, BLOBLIST_ALIGN);
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, struct bloblist_rec **recp)
{
struct bloblist_hdr *hdr = gd->bloblist;
struct bloblist_rec *rec;
int new_alloced;
new_alloced = hdr->alloced + sizeof(*rec) + ALIGN(size, BLOBLIST_ALIGN);
if (new_alloced >= hdr->size) {
log(LOGC_BLOBLIST, LOGL_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;
hdr->alloced = new_alloced;
rec->tag = tag;
rec->hdr_size = sizeof(*rec);
rec->size = size;
rec->spare = 0;
/* Zero the record data */
memset(rec + 1, '\0', rec->size);
*recp = rec;
return 0;
}
static int bloblist_ensurerec(uint tag, struct bloblist_rec **recp, int size)
{
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, &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)
{
struct bloblist_rec *rec;
if (bloblist_addrec(tag, size, &rec))
return NULL;
return rec + 1;
}
int bloblist_ensure_size(uint tag, int size, void **blobp)
{
struct bloblist_rec *rec;
int ret;
ret = bloblist_ensurerec(tag, &rec, size);
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))
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);
if (ret == -ESPIPE)
*sizep = rec->size;
else if (ret)
return ret;
*blobp = (void *)rec + rec->hdr_size;
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(LOGC_BLOBLIST, LOGL_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);
return 0;
}
int bloblist_init(void)
{
bool expected;
int ret = -ENOENT;
/**
* Wed expect to find an existing bloblist in the first phase of U-Boot
* that runs
*/
expected = !u_boot_first_phase();
if (expected)
ret = bloblist_check(CONFIG_BLOBLIST_ADDR,
CONFIG_BLOBLIST_SIZE);
if (ret) {
log(LOGC_BLOBLIST, expected ? LOGL_WARNING : LOGL_DEBUG,
"Existing bloblist not found: creating new bloblist\n");
ret = bloblist_new(CONFIG_BLOBLIST_ADDR, CONFIG_BLOBLIST_SIZE,
0);
} else {
log(LOGC_BLOBLIST, LOGL_DEBUG, "Found existing bloblist\n");
}
return ret;
}
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