New patch to review for coreboot: 57a75b6 ELOG: Add support for generating SMBIOS type15 table

[Stefan Reinauer]

Stefan Reinauer ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/1314

-gerrit

commit 57a75b64ce14f968a4ea251da53fef3b4c3983f3
Author: Duncan Laurie 
Date:   Sat Jun 23 16:13:42 2012 -0700

ELOG: Add support for generating SMBIOS type15 table

This standared SMBIOS 0able describes the location and format
    of the event log to the OS and applications.  In this case the
    pointer is a 32bit physical address pointer to the log in
    memory mapped flash.

Look for SMBIOS type15 entry with 'dmidecode -t 15'

Handle 0x0004, DMI type 15, 23 bytes
    System Event Log
            Area Length: 4095 bytes
            Header Start Offset: 0x0000
            Header Length: 8 bytes
            Data Start Offset: 0x0008
            Access Method: Memory-mapped physical 32-bit address
            Access Address: 0xFFB6F000
            Status: Valid, Not Full
            Change Token: 0x00000000
            Header Format: OEM-specific
            Supported Log Type Descriptors: 0

Change-Id: I1e7729e604000f197e26e69991a2867e869197a6
    Signed-off-by: Duncan Laurie 
---
 src/arch/x86/boot/smbios.c       |    4 ++++
 src/drivers/elog/elog.c          |   29 +++++++++++++++++++++++++++++
 src/drivers/elog/elog_internal.h |   15 +++++++++++++++
 src/include/elog.h               |    1 +
 src/include/smbios.h             |   31 +++++++++++++++++++++++++++++++
 5 files changed, 80 insertions(+), 0 deletions(-)

diff --git a/src/arch/x86/boot/smbios.c b/src/arch/x86/boot/smbios.c
index 3b9e5a1..9c61e28 100644
--- a/src/arch/x86/boot/smbios.c
+++ b/src/arch/x86/boot/smbios.c
@@ -29,6 +29,7 @@
 #include <cpu/x86/name.h>
 #include <cbfs_core.h>
 #include <arch/byteorder.h>
+#include <elog.h>
 #if CONFIG_CHROMEOS
 #include <vendorcode/google/chromeos/gnvs.h>
 #endif
@@ -296,6 +297,9 @@ unsigned long smbios_write_tables(unsigned long current)
    len += smbios_write_type1(&current, handle++);
    len += smbios_write_type3(&current, handle++);
    len += smbios_write_type4(&current, handle++);
+#if CONFIG_ELOG
+	len += elog_smbios_write_type15(&current, handle++);
+#endif
    len += smbios_write_type32(&current, handle++);

len += smbios_walk_device_tree(all_devices, &handle, &current);
diff --git a/src/drivers/elog/elog.c b/src/drivers/elog/elog.c
index 8e56b85..9c0fa93 100644
--- a/src/drivers/elog/elog.c
+++ b/src/drivers/elog/elog.c
@@ -20,6 +20,7 @@
 #include <arch/acpi.h>
 #include <console/console.h>
 #include <pc80/mc146818rtc.h>
+#include <smbios.h>
 #include <spi.h>
 #include <spi_flash.h>
 #include <stdint.h>
@@ -677,6 +678,34 @@ static int elog_spi_init(void)
 }

/*
+ * Fill out SMBIOS Type 15 table entry so the
+ * event log can be discovered at runtime.
+ */
+int elog_smbios_write_type15(unsigned long *current, int handle)
+{
+	struct smbios_type15 *t = (struct smbios_type15 *)*current;
+	int len = sizeof(struct smbios_type15);
+
+	memset(t, 0, len);
+	t->type = SMBIOS_EVENT_LOG;
+	t->length = len - 2;
+	t->handle = handle;
+	t->area_length = elog_get_flash()->total_size - 1;
+	t->header_offset = 0;
+	t->data_offset = sizeof(struct elog_header);
+	t->access_method = SMBIOS_EVENTLOG_ACCESS_METHOD_MMIO32;
+	t->log_status = SMBIOS_EVENTLOG_STATUS_VALID;
+	t->change_token = 0;
+	t->address = (u32)elog_get_flash()->backing_store;
+	t->header_format = ELOG_HEADER_TYPE_OEM;
+	t->log_type_descriptors = 0;
+	t->log_type_descriptor_length = 2;
+
+	*current += len;
+	return len;
+}
+
+/*
  * Clear the entire event log
  */
 int elog_clear(void)
diff --git a/src/drivers/elog/elog_internal.h b/src/drivers/elog/elog_internal.h
index 2a6a0b7..6d9a0d4 100644
--- a/src/drivers/elog/elog_internal.h
+++ b/src/drivers/elog/elog_internal.h
@@ -32,6 +32,21 @@ struct elog_header {
 #define ELOG_SIGNATURE			0x474f4c45  /* 'ELOG' */
 #define ELOG_VERSION			1

+/* SMBIOS event log header */
+struct event_header {
+	u8 type;
+	u8 length;
+	u8 year;
+	u8 month;
+	u8 day;
+	u8 hour;
+	u8 minute;
+	u8 second;
+} __attribute__ ((packed));
+
+/* SMBIOS Type 15 related constants */
+#define ELOG_HEADER_TYPE_OEM		0x88
+
 typedef enum elog_descriptor_type {
    ELOG_DESCRIPTOR_UNKNOWN,
    ELOG_DESCRIPTOR_MEMORY,
diff --git a/src/include/elog.h b/src/include/elog.h
index c6599a2..897a90b 100644
--- a/src/include/elog.h
+++ b/src/include/elog.h
@@ -113,6 +113,7 @@ extern void elog_add_event_byte(u8 event_type, u8 data);
 extern void elog_add_event_word(u8 event_type, u16 data);
 extern void elog_add_event_dword(u8 event_type, u32 data);
 extern void elog_add_event_wake(u8 source, u32 instance);
+extern int elog_smbios_write_type15(unsigned long *current, int handle);

#endif /* !CONFIG_ELOG */

diff --git a/src/include/smbios.h b/src/include/smbios.h
index 7912ba1..c658515 100644
--- a/src/include/smbios.h
+++ b/src/include/smbios.h
@@ -28,6 +28,7 @@ typedef enum {
    SMBIOS_PROCESSOR_INFORMATION=4,
    SMBIOS_CACHE_INFORMATION=7,
    SMBIOS_SYSTEM_SLOTS=9,
+	SMBIOS_EVENT_LOG=15,
    SMBIOS_PHYS_MEMORY_ARRAY=16,
    SMBIOS_MEMORY_DEVICE=17,
    SMBIOS_MEMORY_ARRAY_MAPPED_ADDRESS=19,
@@ -138,6 +139,36 @@ struct smbios_type4 {
    char eos[2];
 } __attribute__((packed));

+struct smbios_type15 {
+	u8 type;
+	u8 length;
+	u16 handle;
+	u16 area_length;
+	u16 header_offset;
+	u16 data_offset;
+	u8 access_method;
+	u8 log_status;
+	u32 change_token;
+	u32 address;
+	u8 header_format;
+	u8 log_type_descriptors;
+	u8 log_type_descriptor_length;
+	char eos[2];
+} __attribute__((packed));
+
+enum {
+	SMBIOS_EVENTLOG_ACCESS_METHOD_IO8 = 0,
+	SMBIOS_EVENTLOG_ACCESS_METHOD_IO8X2,
+	SMBIOS_EVENTLOG_ACCESS_METHOD_IO16,
+	SMBIOS_EVENTLOG_ACCESS_METHOD_MMIO32,
+	SMBIOS_EVENTLOG_ACCESS_METHOD_GPNV,
+};
+
+enum {
+	SMBIOS_EVENTLOG_STATUS_VALID = 1, /* Bit 0 */
+	SMBIOS_EVENTLOG_STATUS_FULL  = 2, /* Bit 1 */
+};
+
 struct smbios_type16 {
    u8 type;
    u8 length;