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common/bloblist.c
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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> |
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#include <u-boot/crc.h> |
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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; |
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new_alloced = hdr->alloced + sizeof(*rec) + ALIGN(size, BLOBLIST_ALIGN); |
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if (new_alloced >= hdr->size) { log(LOGC_BLOBLIST, LOGL_ERR, |
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"Failed to allocate %x bytes size=%x, need size=%x ", |
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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; |
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/* Zero the record data */ memset(rec + 1, '\0', rec->size); |
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*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) { |
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if (size && size != rec->size) { *recp = rec; |
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return -ESPIPE; |
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} |
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} 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; } |
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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; } |
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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 ", 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 "); ret = bloblist_new(CONFIG_BLOBLIST_ADDR, CONFIG_BLOBLIST_SIZE, 0); } else { log(LOGC_BLOBLIST, LOGL_DEBUG, "Found existing bloblist "); } return ret; } |