[PATCH v5 08/12] smbios: Drop support for SMBIOS2 tables

[Simon Glass]

These tables are a pain since there is no way to handle memory above
4GB. Use SMBIOS3 always.

This should hopefully not create problems on x86 devices, since SMBIOS3
was released seven years ago (2015).

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v5:
- Add new patch to drop support for SMBIOS2 tables

 lib/smbios.c | 76 ++++++++++++----------------------------------------
 1 file changed, 17 insertions(+), 59 deletions(-)

diff --git a/lib/smbios.c b/lib/smbios.c
index cfd451e4088..d9d52bd58d7 100644
--- a/lib/smbios.c
+++ b/lib/smbios.c
@@ -545,13 +545,12 @@ ulong write_smbios_table(ulong addr)
 {
 	ofnode parent_node = ofnode_null();
 	ulong table_addr, start_addr;
+	struct smbios3_entry *se;
 	struct smbios_ctx ctx;
 	ulong tables;
 	int len = 0;
 	int max_struct_size = 0;
 	int handle = 0;
-	char *istart;
-	int isize;
 	int i;
 
 	ctx.node = ofnode_null();
@@ -565,12 +564,8 @@ ulong write_smbios_table(ulong addr)
 
 	start_addr = addr;
 
-	/*
-	 * So far we don't know which struct will be used, but they both end
-	 * up using the same amount of 16-bit-aligned space
-	 */
-	addr += max(sizeof(struct smbios_entry), sizeof(struct smbios3_entry));
-	addr = ALIGN(addr, 16);
+	/* move past the (so-far-unwritten) header to start writing structs */
+	addr = ALIGN(addr + sizeof(struct smbios3_entry), 16);
 	tables = addr;
 
 	/* populate minimum required tables */
@@ -592,59 +587,22 @@ ulong write_smbios_table(ulong addr)
 	 * We must use a pointer here so things work correctly on sandbox. The
 	 * user of this table is not aware of the mapping of addresses to
 	 * sandbox's DRAM buffer.
-	 *
-	 * Check the address of the end of the tables. If it is above 4GB then
-	 * it is sensible to use SMBIOS3 even if the start of the table is below
-	 * 4GB (this case is very unlikely to happen in practice)
 	 */
 	table_addr = (ulong)map_sysmem(tables, 0);
-	if (sizeof(table_addr) > sizeof(u32) && addr >= (ulong)UINT_MAX) {
-		struct smbios3_entry *se;
-		/*
-		 * We need to put this >32-bit pointer into the table but the
-		 * field is only 32 bits wide.
-		 */
-		log_debug("WARNING: Using SMBIOS3.0 due to table-address overflow %lx\n",
-			  table_addr);
-		se = map_sysmem(start_addr, sizeof(struct smbios_entry));
-		memset(se, '\0', sizeof(struct smbios_entry));
-		memcpy(se->anchor, "_SM3_", 5);
-		se->length = sizeof(struct smbios3_entry);
-		se->major_ver = SMBIOS_MAJOR_VER;
-		se->minor_ver = SMBIOS_MINOR_VER;
-		se->doc_rev = 0;
-		se->entry_point_rev = 1;
-		se->max_struct_size = len;
-		se->struct_table_address = table_addr;
-		se->checksum = table_compute_checksum(se,
-						sizeof(struct smbios3_entry));
-	} else {
-		struct smbios_entry *se;
-
-		se = map_sysmem(start_addr, sizeof(struct smbios_entry));
-		memset(se, '\0', sizeof(struct smbios_entry));
-		memcpy(se->anchor, "_SM_", 4);
-		se->length = sizeof(struct smbios_entry);
-		se->major_ver = SMBIOS_MAJOR_VER;
-		se->minor_ver = SMBIOS_MINOR_VER;
-		se->max_struct_size = max_struct_size;
-		memcpy(se->intermediate_anchor, "_DMI_", 5);
-		se->struct_table_length = len;
-
-		se->struct_table_address = table_addr;
-
-		se->struct_count = handle;
-
-		/* calculate checksums */
-		istart = (char *)se + SMBIOS_INTERMEDIATE_OFFSET;
-		isize = sizeof(struct smbios_entry) -
-			SMBIOS_INTERMEDIATE_OFFSET;
-		se->intermediate_checksum = table_compute_checksum(istart,
-								   isize);
-		se->checksum = table_compute_checksum(se,
-					      sizeof(struct smbios_entry));
-		unmap_sysmem(se);
-	}
+
+	/* now go back and write the SMBIOS3 header */
+	se = map_sysmem(start_addr, sizeof(struct smbios_entry));
+	memset(se, '\0', sizeof(struct smbios_entry));
+	memcpy(se->anchor, "_SM3_", 5);
+	se->length = sizeof(struct smbios3_entry);
+	se->major_ver = SMBIOS_MAJOR_VER;
+	se->minor_ver = SMBIOS_MINOR_VER;
+	se->doc_rev = 0;
+	se->entry_point_rev = 1;
+	se->max_struct_size = len;
+	se->struct_table_address = table_addr;
+	se->checksum = table_compute_checksum(se, sizeof(struct smbios3_entry));
+	unmap_sysmem(se);
 
 	return addr;
 }
-- 
2.34.1