Add core support for a bloblist to convey data from SPL
At present there is no standard way in U-Boot to pass information from SPL
to U-Boot proper. But sometimes SPL wants to convey information to U-Boot
that U-Boot cannot easily figure out. For example, if SPL sets up SDRAM
then it might want to pass the size of SDRAM, or the location of each
bank, to U-Boot proper.
Add a new 'bloblist' feature which provides this. A bloblist is set up in
the first phase of U-Boot that runs (i.e. TPL or SPL). The location of
this info may be in SRAM or CAR (x86 cache-as-RAM) or somewhere else.
Information placed in this region is preserved (with a checksum) through
TPL and SPL and ends up in U-Boot. At this point it is copied into SDRAM
so it can be used after relocation.
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Andreas Dannenberg <dannenberg@ti.com>
diff --git a/common/Kconfig b/common/Kconfig
index 68e4ddf..57bd16d 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -750,4 +750,52 @@
endmenu
+menu "Blob list"
+
+config BLOBLIST
+ bool "Support for a bloblist"
+ help
+ This enables support for a bloblist in U-Boot, which can be passed
+ from TPL to SPL to U-Boot proper (and potentially to Linux). The
+ blob list supports multiple binary blobs of data, each with a tag,
+ so that different U-Boot components can store data which can survive
+ through to the next stage of the boot.
+
+config SPL_BLOBLIST
+ bool "Support for a bloblist in SPL"
+ depends on BLOBLIST
+ default y if SPL
+ help
+ This enables a bloblist in SPL. If this is the first part of U-Boot
+ to run, then the bloblist is set up in SPL and passed to U-Boot
+ proper. If TPL also has a bloblist, then SPL uses the one from there.
+
+config TPL_BLOBLIST
+ bool "Support for a bloblist in TPL"
+ depends on BLOBLIST
+ default y if TPL
+ help
+ This enables a bloblist in TPL. The bloblist is set up in TPL and
+ passed to SPL and U-Boot proper.
+
+config BLOBLIST_SIZE
+ hex "Size of bloblist"
+ depends on BLOBLIST
+ default 0x400
+ help
+ Sets the size of the bloblist in bytes. This must include all
+ overhead (alignment, bloblist header, record header). The bloblist
+ is set up in the first part of U-Boot to run (TPL, SPL or U-Boot
+ proper), and this sane bloblist is used for subsequent stages.
+
+config BLOBLIST_ADDR
+ hex "Address of bloblist"
+ depends on BLOBLIST
+ default 0xe000 if SANDBOX
+ help
+ Sets the address of the bloblist, set up by the first part of U-Boot
+ which runs. Subsequent U-Boot stages typically use the same address.
+
+endmenu
+
source "common/spl/Kconfig"
diff --git a/common/Makefile b/common/Makefile
index a1edb7c..88079d1 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -61,6 +61,7 @@
endif # !CONFIG_SPL_BUILD
obj-$(CONFIG_$(SPL_TPL_)BOOTSTAGE) += bootstage.o
+obj-$(CONFIG_$(SPL_TPL_)BLOBLIST) += bloblist.o
ifdef CONFIG_SPL_BUILD
ifdef CONFIG_SPL_DFU_SUPPORT
diff --git a/common/bloblist.c b/common/bloblist.c
new file mode 100644
index 0000000..b4cf169
--- /dev/null
+++ b/common/bloblist.c
@@ -0,0 +1,239 @@
+// 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>
+
+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;
+ *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)
+ 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;
+}
+
+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;
+}