[U-Boot] [PATCH v2 03/23] Add core support for a bloblist to convey data from SPL
Simon Glass
sjg at chromium.org
Tue Oct 2 11:22:33 UTC 2018
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.
Signed-off-by: Simon Glass <sjg at chromium.org>
Acked-by: Andreas Dannenberg <dannenberg at ti.com>
---
Changes in v2:
- Fix several typos
common/Kconfig | 48 +++++++++
common/Makefile | 1 +
common/bloblist.c | 239 +++++++++++++++++++++++++++++++++++++++++++++
include/bloblist.h | 195 ++++++++++++++++++++++++++++++++++++
include/log.h | 1 +
5 files changed, 484 insertions(+)
create mode 100644 common/bloblist.c
create mode 100644 include/bloblist.h
diff --git a/common/Kconfig b/common/Kconfig
index 3bb9571b710..2e72b3c83c6 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -715,4 +715,52 @@ config UPDATE_TFTP_MSEC_MAX
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
+ 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 cbca4ff2da6..6aff2b1a6e3 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_CMDLINE) += cli_readline.o cli_simple.o
endif # !CONFIG_SPL_BUILD
obj-$(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 00000000000..b4cf169b05a
--- /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 at 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;
+}
diff --git a/include/bloblist.h b/include/bloblist.h
new file mode 100644
index 00000000000..413736a9080
--- /dev/null
+++ b/include/bloblist.h
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * This provides a standard way of passing information between boot phases
+ * (TPL -> SPL -> U-Boot proper.)
+ *
+ * A list of blobs of data, tagged with their owner. The list resides in memory
+ * and can be updated by SPL, U-Boot, etc.
+ *
+ * Copyright 2018 Google, Inc
+ * Written by Simon Glass <sjg at chromium.org>
+ */
+
+#ifndef __BLOBLIST_H
+#define __BLOBLIST_H
+
+enum {
+ BLOBLIST_VERSION = 0,
+ BLOBLIST_MAGIC = 0xb00757a3,
+ BLOBLIST_ALIGN = 16,
+};
+
+enum bloblist_tag_t {
+ BLOBLISTT_NONE = 0,
+
+ /* Vendor-specific tags are permitted here */
+ BLOBLISTT_EC_HOSTEVENT, /* Chromium OS EC host-event mask */
+ BLOBLISTT_SPL_HANDOFF, /* Hand-off info from SPL */
+ BLOBLISTT_VBOOT_CTX, /* Chromium OS verified boot context */
+ BLOBLISTT_VBOOT_HANDOFF, /* Chromium OS internal handoff info */
+};
+
+/**
+ * struct bloblist_hdr - header for the bloblist
+ *
+ * This is stored at the start of the bloblist which is always on a 16-byte
+ * boundary. Records follow this header. The bloblist normally stays in the
+ * same place in memory as SPL and U-Boot execute, but it can be safely moved
+ * around.
+ *
+ * None of the bloblist structures contain pointers but it is possible to put
+ * pointers inside a bloblist record if desired. This is not encouraged,
+ * since it can make part of the bloblist inaccessible if the pointer is
+ * no-longer valid. It is better to just store all the data inside a bloblist
+ * record.
+ *
+ * Each bloblist record is aligned to a 16-byte boundary and follows immediately
+ * from the last.
+ *
+ * @version: BLOBLIST_VERSION
+ * @hdr_size: Size of this header, normally sizeof(struct bloblist_hdr). The
+ * first bloblist_rec starts at this offset from the start of the header
+ * @flags: Space for BLOBLISTF_... flags (none yet)
+ * @magic: BLOBLIST_MAGIC
+ * @size: Total size of all records (non-zero if valid) including this header.
+ * The bloblist extends for this many bytes from the start of this header.
+ * @alloced: Total size allocated for this bloblist. When adding new records,
+ * the bloblist can grow up to this size. This starts out as
+ * sizeof(bloblist_hdr) since we need at least that much space to store a
+ * valid bloblist
+ * @spare: Space space
+ * @chksum: CRC32 for the entire bloblist allocated area. Since any of the
+ * blobs can be altered after being created, this checksum is only valid
+ * when the bloblist is finalised before jumping to the next stage of boot.
+ * Note: @chksum is last to make it easier to exclude it from the checksum
+ * calculation.
+ */
+struct bloblist_hdr {
+ u32 version;
+ u32 hdr_size;
+ u32 flags;
+ u32 magic;
+
+ u32 size;
+ u32 alloced;
+ u32 spare;
+ u32 chksum;
+};
+
+/**
+ * struct bloblist_rec - record for the bloblist
+ *
+ * NOTE: Only exported for testing purposes. Do not use this struct.
+ *
+ * The bloblist contains a number of records each consisting of this record
+ * structure followed by the data contained. Each records is 16-byte aligned.
+ *
+ * @tag: Tag indicating what the record contains
+ * @hdr_size: Size of this header, normally sizeof(struct bloblist_rec). The
+ * record's data starts at this offset from the start of the record
+ * @size: Size of record in bytes, excluding the header size. This does not
+ * need to be aligned (e.g. 3 is OK).
+ * @spare: Spare space for other things
+ */
+struct bloblist_rec {
+ u32 tag;
+ u32 hdr_size;
+ u32 size;
+ u32 spare;
+};
+
+/**
+ * bloblist_find() - Find a blob
+ *
+ * Searches the bloblist and returns the blob with the matching tag
+ *
+ * @tag: Tag to search for (enum bloblist_tag_t)
+ * @size: Expected size of the blob
+ * @return pointer to blob if found, or NULL if not found, or a blob was found
+ * but it is the wrong size
+ */
+void *bloblist_find(uint tag, int size);
+
+/**
+ * bloblist_add() - Add a new blob
+ *
+ * Add a new blob to the bloblist
+ *
+ * This should only be called if you konw there is no existing blob for a
+ * particular tag. It is typically safe to call in the first phase of U-Boot
+ * (e.g. TPL or SPL). After that, bloblist_ensure() should be used instead.
+ *
+ * @tag: Tag to add (enum bloblist_tag_t)
+ * @size: Size of the blob
+ * @return pointer to the newly added block, or NULL if there is not enough
+ * space for the blob
+ */
+void *bloblist_add(uint tag, int size);
+
+/**
+ * bloblist_ensure_size() - Find or add a blob
+ *
+ * Find an existing blob, or add a new one if not found
+ *
+ * @tag: Tag to add (enum bloblist_tag_t)
+ * @size: Size of the blob
+ * @blobp: Returns a pointer to blob on success
+ * @return 0 if OK, -ENOSPC if it is missing and could not be added due to lack
+ * of space, or -ESPIPE it exists but has the wrong size
+ */
+int bloblist_ensure_size(uint tag, int size, void **blobp);
+
+/**
+ * bloblist_ensure() - Find or add a blob
+ *
+ * Find an existing blob, or add a new one if not found
+ *
+ * @tag: Tag to add (enum bloblist_tag_t)
+ * @size: Size of the blob
+ * @return pointer to blob, or NULL if it is missing and could not be added due
+ * to lack of space, or it exists but has the wrong size
+ */
+void *bloblist_ensure(uint tag, int size);
+
+/**
+ * bloblist_new() - Create a new, empty bloblist of a given size
+ *
+ * @addr: Address of bloblist
+ * @size: Initial size for bloblist
+ * @flags: Flags to use for bloblist
+ * @return 0 if OK, -EFAULT if addr is not aligned correctly, -ENOSPC is the
+ * area is not large enough
+ */
+int bloblist_new(ulong addr, uint size, uint flags);
+
+/**
+ * bloblist_check() - Check if a bloblist exists
+ *
+ * @addr: Address of bloblist
+ * @size: Expected size of blobsize, or 0 to detect the size
+ * @return 0 if OK, -ENOENT if the magic number doesn't match (indicating that
+ * there problem is no bloblist at the given address), -EPROTONOSUPPORT
+ * if the version does not match, -EIO if the checksum does not match,
+ * -EFBIG if the expected size does not match the detected size
+ */
+int bloblist_check(ulong addr, uint size);
+
+/**
+ * bloblist_finish() - Set up the bloblist for the next U-Boot part
+ *
+ * This sets the correct checksum for the bloblist. This ensures that the
+ * bloblist will be detected correctly by the next phase of U-Boot.
+ *
+ * @return 0
+ */
+int bloblist_finish(void);
+
+/**
+ * bloblist_init() - Init the bloblist system with a single bloblist
+ *
+ * This uses CONFIG_BLOBLIST_ADDR and CONFIG_BLOBLIST_SIZE to set up a bloblist
+ * for use by U-Boot.
+ */
+int bloblist_init(void);
+
+#endif /* __BLOBLIST_H */
diff --git a/include/log.h b/include/log.h
index 1146f423a7a..61411b72eac 100644
--- a/include/log.h
+++ b/include/log.h
@@ -46,6 +46,7 @@ enum log_category_t {
LOGC_DM, /* Core driver-model */
LOGC_DT, /* Device-tree */
LOGC_EFI, /* EFI implementation */
+ LOGC_BLOBLIST, /* Bloblist */
LOGC_COUNT,
LOGC_END,
--
2.19.0.605.g01d371f741-goog
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