/**
* find_next_mrc_cache() - get next cache entry
*
* @entry: MRC cache flash area
* @cache: Entry to start from
*
* @return next cache entry if found, NULL if we got to the end
*/
static struct mrc_data_container *find_next_mrc_cache(struct mrc_region *entry,
struct mrc_data_container *cache)
{
ulong base_addr, end_addr;
base_addr = entry->base + entry->offset;
end_addr = base_addr + entry->length;
cache = next_mrc_block(cache);
if ((ulong)cache >= end_addr) {
/* Crossed the boundary */
cache = NULL;
debug("%s: no available entries found\n", __func__);
} else {
debug("%s: picked next entry from cache block at %p\n",
__func__, cache);
}
return cache;
}
/* find the first empty block in the MRC cache area.
* If there's none, return NULL.
*
* @mrc_cache_base - base address of the MRC cache area
* @mrc_cache - current entry (for which we need to find next)
* @region_size - total size of the MRC cache area
*/
static struct mrc_data_container *find_next_mrc_cache
(struct mrc_data_container *mrc_cache_base,
struct mrc_data_container *mrc_cache,
u32 region_size)
{
u32 region_end = (u32) mrc_cache_base + region_size;
mrc_cache = next_mrc_block(mrc_cache);
if ((u32)mrc_cache >= region_end) {
/* Crossed the boundary */
mrc_cache = NULL;
printk(BIOS_DEBUG, "%s: no available entries found\n",
__func__);
} else {
printk(BIOS_DEBUG,
"%s: picked next entry from cache block at %p\n",
__func__, mrc_cache);
}
return mrc_cache;
}
/*
* Find the largest index block in the MRC cache. Return NULL if none is
* found.
*/
static struct mrc_data_container *find_current_mrc_cache_local
(struct mrc_data_container *mrc_cache, u32 region_size)
{
u32 region_end;
u32 entry_id = 0;
struct mrc_data_container *mrc_next = mrc_cache;
region_end = (u32) mrc_cache + region_size;
/* Search for the last filled entry in the region */
while (is_mrc_cache(mrc_next)) {
entry_id++;
mrc_cache = mrc_next;
mrc_next = next_mrc_block(mrc_next);
if ((u32)mrc_next >= region_end) {
/* Stay in the MRC data region */
break;
}
}
if (entry_id == 0) {
printk(BIOS_ERR, "%s: No valid fast boot cache found.\n",
__func__);
return NULL;
}
/* Verify checksum */
if (mrc_cache->mrc_checksum !=
compute_ip_checksum(mrc_cache->mrc_data,
mrc_cache->mrc_data_size)) {
printk(BIOS_ERR, "%s: fast boot cache checksum mismatch\n",
__func__);
return NULL;
}
printk(BIOS_DEBUG, "%s: picked entry %u from cache block\n", __func__,
entry_id - 1);
return mrc_cache;
}
struct mrc_data_container *mrccache_find_current(struct mrc_region *entry)
{
struct mrc_data_container *cache, *next;
ulong base_addr, end_addr;
uint id;
base_addr = entry->base + entry->offset;
end_addr = base_addr + entry->length;
cache = NULL;
/* Search for the last filled entry in the region */
for (id = 0, next = (struct mrc_data_container *)base_addr;
is_mrc_cache(next);
id++) {
cache = next;
next = next_mrc_block(next);
if ((ulong)next >= end_addr)
break;
}
if (id-- == 0) {
debug("%s: No valid MRC cache found.\n", __func__);
return NULL;
}
/* Verify checksum */
if (cache->checksum != compute_ip_checksum(cache->data,
cache->data_size)) {
printf("%s: MRC cache checksum mismatch\n", __func__);
return NULL;
}
debug("%s: picked entry %u from cache block\n", __func__, id);
return cache;
}
