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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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