boot: Add smbios_populate_raw_info

This function will be used to gather information for DeviceTree matching

src/boot/efi/smbios.c

@@ -59,6 +59,26 @@ typedef struct {
         uint8_t bios_characteristics_ext[2];
 } _packed_ SmbiosTableType0;
 
+typedef struct {
+        SmbiosHeader header;
+        uint8_t manufacturer;
+        uint8_t product_name;
+        uint8_t version;
+        uint8_t serial_number;
+        EFI_GUID uuid;
+        uint8_t wake_up_type;
+        uint8_t sku_number;
+        uint8_t family;
+} _packed_ SmbiosTableType1;
+
+typedef struct {
+        SmbiosHeader header;
+        uint8_t manufacturer;
+        uint8_t product_name;
+        uint8_t version;
+        uint8_t serial_number;
+} _packed_ SmbiosTableType2;
+
 typedef struct {
         SmbiosHeader header;
         uint8_t count;
@@ -186,3 +206,45 @@ const char* smbios_find_oem_string(const char *name) {
 
         return NULL;
 }
+
+static const char* smbios_get_string(const SmbiosHeader *header, size_t nr, uint64_t left) {
+        assert(header);
+        const char *s = (const char *) header;
+
+        /* We assume that get_smbios_table() already validated the header size making some superficial sense */
+        assert(left >= header->length);
+        s += header->length;
+        left -= header->length;
+
+        size_t index = 1;
+        for (const char *p = s, *limit = s + left; index <= nr && p < limit; index++) {
+                const char *e = memchr(p, 0, limit - p);
+                if (!e || e == p) /* Double NUL byte means we've reached the end of the strings. */
+                        break;
+
+                if (index == nr)
+                        return p;
+
+                p = e + 1;
+        }
+        return NULL;
+}
+
+void smbios_raw_info_populate(RawSmbiosInfo *ret_info) {
+        assert(ret_info);
+        uint64_t left;
+
+        const SmbiosTableType1 *type1 = (const SmbiosTableType1 *) get_smbios_table(1, sizeof(SmbiosTableType1), &left);
+        if (type1) {
+                ret_info->manufacturer = smbios_get_string(&type1->header, type1->manufacturer, left);
+                ret_info->product_name = smbios_get_string(&type1->header, type1->product_name, left);
+                ret_info->product_sku = smbios_get_string(&type1->header, type1->sku_number, left);
+                ret_info->family = smbios_get_string(&type1->header, type1->family, left);
+        }
+
+        const SmbiosTableType2 *type2 = (const SmbiosTableType2 *) get_smbios_table(2, sizeof(SmbiosTableType2), &left);
+        if (type2) {
+                ret_info->baseboard_manufacturer = smbios_get_string(&type2->header, type2->manufacturer, left);
+                ret_info->baseboard_product = smbios_get_string(&type2->header, type2->product_name, left);
+        }
+}

src/boot/efi/smbios.h

@@ -6,3 +6,14 @@
 bool smbios_in_hypervisor(void);
 
 const char* smbios_find_oem_string(const char *name);
+
+typedef struct RawSmbiosInfo {
+        const char *manufacturer;
+        const char *product_name;
+        const char *product_sku;
+        const char *family;
+        const char *baseboard_product;
+        const char *baseboard_manufacturer;
+} RawSmbiosInfo;
+
+void smbios_raw_info_populate(RawSmbiosInfo *ret_info);