Add support for LinuxBIOS tables independent from its source tree

Corresponding to flashrom svn r89 and coreboot v2 svn r2551.
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>

lbtable.c

@@ -8,7 +8,7 @@
 #include <errno.h>
 #include <sys/mman.h>
 #include "flash.h"
-#include "../../src/include/boot/linuxbios_tables.h"
+#include "linuxbios_tables.h"
 #include "debug.h"
 
 char *lb_part=NULL, *lb_vendor=NULL;

linuxbios_tables.h

+#ifndef LINUXBIOS_TABLES_H
+#define LINUXBIOS_TABLES_H
+
+#include <stdint.h>
+
+/* The linuxbios table information is for conveying information
+ * from the firmware to the loaded OS image.  Primarily this
+ * is expected to be information that cannot be discovered by
+ * other means, such as quering the hardware directly.
+ *
+ * All of the information should be Position Independent Data.  
+ * That is it should be safe to relocated any of the information
+ * without it's meaning/correctnes changing.   For table that
+ * can reasonably be used on multiple architectures the data
+ * size should be fixed.  This should ease the transition between
+ * 32 bit and 64 bit architectures etc.
+ *
+ * The completeness test for the information in this table is:
+ * - Can all of the hardware be detected?
+ * - Are the per motherboard constants available?
+ * - Is there enough to allow a kernel to run that was written before
+ *   a particular motherboard is constructed? (Assuming the kernel
+ *   has drivers for all of the hardware but it does not have
+ *   assumptions on how the hardware is connected together).
+ *
+ * With this test it should be straight forward to determine if a
+ * table entry is required or not.  This should remove much of the
+ * long term compatibility burden as table entries which are
+ * irrelevant or have been replaced by better alternatives may be
+ * dropped.  Of course it is polite and expidite to include extra
+ * table entries and be backwards compatible, but it is not required.
+ */
+
+/* Since LinuxBIOS is usually compiled 32bit, gcc will align 64bit 
+ * types to 32bit boundaries. If the LinuxBIOS table is dumped on a 
+ * 64bit system, a uint64_t would be aligned to 64bit boundaries, 
+ * breaking the table format.
+ *
+ * lb_uint64 will keep 64bit LinuxBIOS table values aligned to 32bit
+ * to ensure compatibility. They can be accessed with the two functions
+ * below: unpack_lb64() and pack_lb64()
+ *
+ * See also: util/lbtdump/lbtdump.c
+ */
+
+struct lb_uint64 {
+	uint32_t lo;
+	uint32_t hi;
+};
+
+static inline uint64_t unpack_lb64(struct lb_uint64 value)
+{
+        uint64_t result;
+        result = value.hi;
+        result = (result << 32) + value.lo;
+        return result;
+}
+
+static inline struct lb_uint64 pack_lb64(uint64_t value)
+{
+        struct lb_uint64 result;
+        result.lo = (value >> 0) & 0xffffffff;
+        result.hi = (value >> 32) & 0xffffffff;
+        return result;
+}
+
+
+
+struct lb_header
+{
+	uint8_t  signature[4]; /* LBIO */
+	uint32_t header_bytes;
+	uint32_t header_checksum;
+	uint32_t table_bytes;
+	uint32_t table_checksum;
+	uint32_t table_entries;
+};
+
+/* Every entry in the boot enviroment list will correspond to a boot
+ * info record.  Encoding both type and size.  The type is obviously
+ * so you can tell what it is.  The size allows you to skip that
+ * boot enviroment record if you don't know what it easy.  This allows
+ * forward compatibility with records not yet defined.
+ */
+struct lb_record {
+	uint32_t tag;		/* tag ID */
+	uint32_t size;		/* size of record (in bytes) */
+};
+
+#define LB_TAG_UNUSED	0x0000
+
+#define LB_TAG_MEMORY	0x0001
+
+struct lb_memory_range {
+	struct lb_uint64 start;
+	struct lb_uint64 size;
+	uint32_t type;
+#define LB_MEM_RAM       1	/* Memory anyone can use */
+#define LB_MEM_RESERVED  2	/* Don't use this memory region */
+#define LB_MEM_TABLE     16	/* Ram configuration tables are kept in */
+};
+
+struct lb_memory {
+	uint32_t tag;
+	uint32_t size;
+	struct lb_memory_range map[0];
+};
+
+#define LB_TAG_HWRPB	0x0002
+struct lb_hwrpb {
+	uint32_t tag;
+	uint32_t size;
+	uint64_t hwrpb;
+};
+
+#define LB_TAG_MAINBOARD	0x0003
+struct lb_mainboard {
+	uint32_t tag;
+	uint32_t size;
+	uint8_t  vendor_idx;
+	uint8_t  part_number_idx;
+	uint8_t  strings[0];
+};
+
+#define LB_TAG_VERSION		0x0004
+#define LB_TAG_EXTRA_VERSION	0x0005
+#define LB_TAG_BUILD		0x0006
+#define LB_TAG_COMPILE_TIME	0x0007
+#define LB_TAG_COMPILE_BY	0x0008
+#define LB_TAG_COMPILE_HOST	0x0009
+#define LB_TAG_COMPILE_DOMAIN	0x000a
+#define LB_TAG_COMPILER		0x000b
+#define LB_TAG_LINKER		0x000c
+#define LB_TAG_ASSEMBLER	0x000d
+struct lb_string {
+	uint32_t tag;
+	uint32_t size;
+	uint8_t  string[0];
+};
+
+/* The following structures are for the cmos definitions table */
+#define LB_TAG_CMOS_OPTION_TABLE 200
+/* cmos header record */
+struct cmos_option_table {
+	uint32_t tag;               /* CMOS definitions table type */
+	uint32_t size;               /* size of the entire table */
+	uint32_t header_length;      /* length of header */
+};
+
+/* cmos entry record
+        This record is variable length.  The name field may be
+        shorter than CMOS_MAX_NAME_LENGTH. The entry may start
+        anywhere in the byte, but can not span bytes unless it
+        starts at the beginning of the byte and the length is
+        fills complete bytes.
+*/
+#define LB_TAG_OPTION 201
+struct cmos_entries {
+	uint32_t tag;                /* entry type */
+	uint32_t size;               /* length of this record */
+	uint32_t bit;                /* starting bit from start of image */
+	uint32_t length;             /* length of field in bits */
+	uint32_t config;             /* e=enumeration, h=hex, r=reserved */
+	uint32_t config_id;          /* a number linking to an enumeration record */
+#define CMOS_MAX_NAME_LENGTH 32
+	uint8_t name[CMOS_MAX_NAME_LENGTH]; /* name of entry in ascii, 
+					       variable length int aligned */
+};
+
+
+/* cmos enumerations record
+        This record is variable length.  The text field may be
+        shorter than CMOS_MAX_TEXT_LENGTH.
+*/
+#define LB_TAG_OPTION_ENUM 202
+struct cmos_enums {
+	uint32_t tag;		     /* enumeration type */
+	uint32_t size; 		     /* length of this record */
+	uint32_t config_id;          /* a number identifying the config id */
+	uint32_t value;              /* the value associated with the text */
+#define CMOS_MAX_TEXT_LENGTH 32
+	uint8_t text[CMOS_MAX_TEXT_LENGTH]; /* enum description in ascii, 
+						variable length int aligned */
+};
+
+/* cmos defaults record
+        This record contains default settings for the cmos ram.
+*/
+#define LB_TAG_OPTION_DEFAULTS 203
+struct cmos_defaults {
+	uint32_t tag;                /* default type */
+	uint32_t size;               /* length of this record */
+	uint32_t name_length;        /* length of the following name field */
+	uint8_t name[CMOS_MAX_NAME_LENGTH]; /* name identifying the default */
+#define CMOS_IMAGE_BUFFER_SIZE 128
+	uint8_t default_set[CMOS_IMAGE_BUFFER_SIZE]; /* default settings */
+};
+
+#define LB_TAG_OPTION_CHECKSUM 204
+struct	cmos_checksum {
+	uint32_t tag;
+	uint32_t size;
+	/* In practice everything is byte aligned, but things are measured
+	 * in bits to be consistent.
+	 */
+	uint32_t range_start;	/* First bit that is checksummed (byte aligned) */
+	uint32_t range_end;	/* Last bit that is checksummed (byte aligned) */
+	uint32_t location;	/* First bit of the checksum (byte aligned) */
+	uint32_t type;		/* Checksum algorithm that is used */
+#define CHECKSUM_NONE	0
+#define CHECKSUM_PCBIOS	1
+};
+
+
+
+#endif /* LINUXBIOS_TABLES_H */