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[int13] Add infrastructure to support EDD version 4.0

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Support the extensions mandated by EDD 4.0, including:

 o  the ability to specify a flat physical address in a disk address
    packet,

 o  the ability to specify a sector count greater than 127 in a disk
    address packet,

 o  support for all functions within the Fixed Disk Access and EDD
    Support subsets,

 o  the ability to describe a device using EDD Device Path Information.

This implementation is based on draft revision 3 of the EDD 4.0
specification, with reference to the EDD 3.0 specification.  It is
possible that this implementation may need to change in order to
conform to the final published EDD 4.0 specification.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-09-22 00:12:23 +01:00
parent adbe63860a
commit 3c35ae2f3b
7 changed files with 527 additions and 30 deletions
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31
src/arch/i386/include/int13.h
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@@ -11,6 +11,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <ipxe/list.h>
#include <ipxe/edd.h>
#include <realmode.h>
/**
@@ -36,6 +37,10 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define INT13_EXTENDED_READ 0x42
/** Extended write */
#define INT13_EXTENDED_WRITE 0x43
/** Verify sectors */
#define INT13_EXTENDED_VERIFY 0x44
/** Extended seek */
#define INT13_EXTENDED_SEEK 0x47
/** Get extended drive parameters */
#define INT13_GET_EXTENDED_PARAMETERS 0x48
/** Get CD-ROM status / terminate emulation */
@@ -68,16 +73,22 @@ FILE_LICENCE ( GPL2_OR_LATER );
struct int13_disk_address {
/** Size of the packet, in bytes */
uint8_t bufsize;
/** Reserved, must be zero */
uint8_t reserved;
/** Reserved */
uint8_t reserved_a;
/** Block count */
uint16_t count;
uint8_t count;
/** Reserved */
uint8_t reserved_b;
/** Data buffer */
struct segoff buffer;
/** Starting block number */
uint64_t lba;
/** Data buffer (EDD-3.0 only) */
/** Data buffer (EDD 3.0+ only) */
uint64_t buffer_phys;
/** Block count (EDD 4.0+ only) */
uint32_t long_count;
/** Reserved */
uint32_t reserved_c;
} __attribute__ (( packed ));
/** INT 13 disk parameters */
@@ -96,6 +107,10 @@ struct int13_disk_parameters {
uint64_t sectors;
/** Bytes per sector */
uint16_t sector_size;
/** Device parameter table extension */
struct segoff dpte;
/** Device path information */
struct edd_device_path_information dpi;
} __attribute__ (( packed ));
/**
@@ -147,6 +162,8 @@ struct int13_disk_parameters {
#define INT13_EXTENSION_REMOVABLE 0x02
/** EDD functions supported */
#define INT13_EXTENSION_EDD 0x04
/** 64-bit extensions are present */
#define INT13_EXTENSION_64BIT 0x08
/** @} */
@@ -166,6 +183,12 @@ struct int13_disk_parameters {
/** @} */
/** Maximum number of sectors for which CHS geometry is allowed to be valid
*
* This number is taken from the EDD specification.
*/
#define INT13_MAX_CHS_SECTORS 15482880
/** Bootable CD-ROM specification packet */
struct int13_cdrom_specification {
/** Size of packet in bytes */