Patch set updated for coreboot: smbios: Calculate SMBIOS Max Struct size

[Ben Frisch]

Ben Frisch ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/10163

-gerrit

commit b4fc4039f2a5422777e06e6cd5af0ecc16802051
Author: Ben Frisch 
Date:   Sat May 9 19:52:18 2015 -0500

smbios: Calculate SMBIOS Max Struct size

The SMBIOS Specification 2.3 and up defines Maximum Structure Size
    as the "Size of the largest SMBIOS structure, in bytes, and encompasses
    the structure’s formatted area and text strings." The hardcoded size
    is too small to accurately represent the maximum SMBIOS structure sizes.
    While the field is not used by Linux it is used by some RTOS
    implementations, eg. VxWorks.

TEST=Booted Linux and ran github.com/bfrisch/dmidecode which verified
    the maximum structure size on Minnowboard Max.
    Change-Id: I98087975c53a02857742dea283f4e303485b2ffe
    Signed-off-by: Ben Frisch 
---
 src/arch/x86/boot/smbios.c | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/src/arch/x86/boot/smbios.c b/src/arch/x86/boot/smbios.c
index 1dbe32d..fc5ac66 100644
--- a/src/arch/x86/boot/smbios.c
+++ b/src/arch/x86/boot/smbios.c
@@ -529,11 +529,14 @@ static int smbios_walk_device_tree(struct device *tree, int *handle, unsigned lo
    return len;
 }

+#define update_max(len, max_len, stmt) do { int tmp = stmt; max_len = MAX(max_len, tmp); len += tmp; } while(0)
 unsigned long smbios_write_tables(unsigned long current)
 {
    struct smbios_entry *se;
    unsigned long tables;
-	int len, handle = 0;
+	int len = 0;
+	int max_struct_size = 0;
+	int handle = 0;

current = ALIGN(current, 16);
    printk(BIOS_DEBUG, "%s: %08lx\n", __func__, current);
@@ -543,28 +546,28 @@ unsigned long smbios_write_tables(unsigned long current)
    current = ALIGN(current, 16);

tables = current;
-	len = smbios_write_type0(&current, handle++);
-	len += smbios_write_type1(&current, handle++);
-	len += smbios_write_type2(&current, handle++);
-	len += smbios_write_type3(&current, handle++);
-	len += smbios_write_type4(&current, handle++);
-	len += smbios_write_type11(&current, &handle);
+	update_max(len, max_struct_size, smbios_write_type0(&current, handle++));
+	update_max(len, max_struct_size, smbios_write_type1(&current, handle++));
+	update_max(len, max_struct_size, smbios_write_type2(&current, handle++));
+	update_max(len, max_struct_size, smbios_write_type3(&current, handle++));
+	update_max(len, max_struct_size, smbios_write_type4(&current, handle++));
+	update_max(len, max_struct_size, smbios_write_type11(&current, &handle));
 #if CONFIG_ELOG
-	len += elog_smbios_write_type15(&current, handle++);
+	update_max(len, max_struct_size, smbios_write_type15(&current, &handle));
 #endif
-	len += smbios_write_type17(&current, &handle);
-	len += smbios_write_type32(&current, handle++);
+	update_max(len, max_struct_size, smbios_write_type17(&current, &handle));
+	update_max(len, max_struct_size, smbios_write_type32(&current, handle++));

-	len += smbios_walk_device_tree(all_devices, &handle, &current);
+	update_max(len, max_struct_size, smbios_walk_device_tree(all_devices, &handle, &current));

-	len += smbios_write_type127(&current, handle++);
+	update_max(len, max_struct_size, smbios_write_type127(&current, handle++));

memset(se, 0, sizeof(struct smbios_entry));
    memcpy(se->anchor, "_SM_", 4);
    se->length = sizeof(struct smbios_entry);
    se->major_version = 2;
    se->minor_version = 7;
-	se->max_struct_size = 24;
+	se->max_struct_size = max_struct_size;
    se->struct_count = handle;
    memcpy(se->intermediate_anchor_string, "_DMI_", 5);