Am Di., 16. Apr. 2019 um 13:38 Uhr schrieb Christian Gmeiner christian.gmeiner@gmail.com:
Add an very simple API to be able to access SMBIOS strings like vendor, model and bios version.
ping
Signed-off-by: Christian Gmeiner christian.gmeiner@gmail.com
include/smbios.h | 37 ++++++++++ lib/Kconfig | 6 ++ lib/Makefile | 1 + lib/smbios-parser.c | 162 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 206 insertions(+) create mode 100644 lib/smbios-parser.c
diff --git a/include/smbios.h b/include/smbios.h index 97b9ddce23..ad44e54245 100644 --- a/include/smbios.h +++ b/include/smbios.h @@ -237,4 +237,41 @@ typedef int (*smbios_write_type)(ulong *addr, int handle); */ ulong write_smbios_table(ulong addr);
+struct smbios_parser;
+/**
- smbios_parser_create() - Create smbios parser
- @addr: start address to search for SMBIOS structure
- @len: size of search area
- @return: NULL or valid pointer to a struct smbios_parser
- */
+struct smbios_parser *smbios_parser_create(unsigned int addr, unsigned int len);
+/**
- smbios_parser_destroy() - Destroy smbios parser
- @p: pointer to a struct smbios_parser
- */
+void smbios_parser_destroy(struct smbios_parser *p);
+/**
- smbios_header() - Search for SMBIOS header type
- @p: pointer to a struct smbios_parser
- @type: SMBIOS type
- @return: NULL or a valid pointer to a struct smbios_header
- */
+struct smbios_header *smbios_header(const struct smbios_parser *p, int type);
+/**
- smbios_string() - Return string from SMBIOS
- @header: pointer to struct smbios_header
- @index: string index
- @return: NULL or a valid const char pointer
- */
+const char *smbios_string(const struct smbios_header *header, int index);
#endif /* _SMBIOS_H_ */ diff --git a/lib/Kconfig b/lib/Kconfig index 2120216593..59aafc63a7 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -432,6 +432,12 @@ config SMBIOS_PRODUCT_NAME
endmenu
+config SMBIOS_PARSER
bool "SMBIOS parser"default nhelpA simple parser for SMBIOS data.source lib/efi/Kconfig source lib/efi_loader/Kconfig source lib/optee/Kconfig diff --git a/lib/Makefile b/lib/Makefile index 47829bfed5..f095bd420a 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_FIT) += fdtdec_common.o obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o obj-$(CONFIG_GZIP_COMPRESSED) += gzip.o obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += smbios.o +obj-$(CONFIG_SMBIOS_PARSER) += smbios-parser.o obj-$(CONFIG_IMAGE_SPARSE) += image-sparse.o obj-y += ldiv.o obj-$(CONFIG_MD5) += md5.o diff --git a/lib/smbios-parser.c b/lib/smbios-parser.c new file mode 100644 index 0000000000..b24fd7210c --- /dev/null +++ b/lib/smbios-parser.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*
- Copyright (C) 2019, Bachmann electronic GmbH
- */
+#include <common.h> +#include <malloc.h> +#include <mapmem.h> +#include <smbios.h>
+struct smbios_parser {
void *search_area;unsigned int search_area_len;struct smbios_entry *entry;void *data;+};
+static inline int verify_checksum(const struct smbios_entry *e) +{
/** Checksums for SMBIOS tables are calculated to have a value, so that* the sum over all bytes yields zero (using unsigned 8 bit arithmetic).*/u8 *byte = (u8 *)e;u8 sum = 0;for (int i = 0; i < e->length; i++)sum += byte[i];return sum;+}
+static struct smbios_entry *find_smbios_entry(const struct smbios_parser *p) +{
static const char sm_sig[] = "_SM_";u8 *buf = (u8 *)p->search_area;const u8 *end = (u8 *)p->search_area + p->search_area_len;struct smbios_entry *entry = NULL;/* look for smbios entry */while (buf < end) {if (memcmp(sm_sig, buf, 4) == 0) {entry = (struct smbios_entry *)buf;if (verify_checksum(entry)) {entry = NULL;buf++;continue;}break;}buf++;}return entry;+}
+void smbios_parser_destroy(struct smbios_parser *p) +{
if (!p)return;unmap_sysmem(p->data);unmap_sysmem(p->search_area);free(p);+}
+struct smbios_parser *smbios_parser_create(unsigned int addr, unsigned int len) +{
struct smbios_parser *p = malloc(sizeof(struct smbios_parser));if (!p)return NULL;p->search_area_len = len;p->search_area = map_sysmem(addr, len);if (!p->search_area)goto fail;/* find main entry smbios table */p->entry = find_smbios_entry(p);if (!p->entry)goto fail;/* map smbios data area */p->data = map_sysmem(p->entry->struct_table_address,p->entry->struct_table_length);if (!p->data)goto fail;return p;+fail:
smbios_parser_destroy(p);return NULL;+}
+static struct smbios_header *next_header(const struct smbios_header *curr) +{
u8 *pos = ((u8 *)curr) + curr->length;/* search for _double_ NULL bytes */while (!((*pos == 0) && (*(pos + 1) == 0)))pos++;/* step behind the double NULL bytes */pos += 2;return (struct smbios_header *)pos;+}
+struct smbios_header *smbios_header(const struct smbios_parser *p, int type) +{
const struct smbios_entry *entry = p->entry;const unsigned int num_header = entry->struct_count;struct smbios_header *header = (struct smbios_header *)p->data;for (unsigned int i = 0; i < num_header; i++) {if (header->type == type)return header;header = next_header(header);}return NULL;+}
+static const char *string_from_smbios_table(const struct smbios_header *header,
int idx)+{
unsigned int i = 1;u8 *pos;if (!header)return NULL;pos = ((u8 *)header) + header->length;while (i < idx) {if (*pos == 0x0)i++;pos++;}return (const char *)pos;+}
+const char *smbios_string(const struct smbios_header *header, int index) +{
if (!header)return NULL;return string_from_smbios_table(header, index);+}
2.20.1