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[efi] Provide ACPI table description for SAN devices 

Provide a basic proof of concept ACPI table description (e.g. iBFT for
iSCSI) for SAN devices in a UEFI environment, using a control flow
that is functionally identical to that used in a BIOS environment.

Originally-implemented-by: Vishvananda Ishaya Abrams <vish.ishaya@oracle.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/58/merge
Michael Brown 2017-03-13 12:18:46 +00:00
parent 553f485734
commit fdcdc5203b
1 changed files with 69 additions and 0 deletions
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69
src/interface/efi/efi_block.c
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@ -46,15 +46,21 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/process.h>
#include <ipxe/sanboot.h>
#include <ipxe/iso9660.h>
#include <ipxe/acpi.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/BlockIo.h>
#include <ipxe/efi/Protocol/SimpleFileSystem.h>
#include <ipxe/efi/Protocol/AcpiTable.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_strings.h>
#include <ipxe/efi/efi_snp.h>
#include <ipxe/efi/efi_utils.h>
#include <ipxe/efi/efi_block.h>
/** ACPI table protocol protocol */
static EFI_ACPI_TABLE_PROTOCOL *acpi;
EFI_REQUEST_PROTOCOL ( EFI_ACPI_TABLE_PROTOCOL, &acpi );
/** Boot filename */
static wchar_t efi_block_boot_filename[] = EFI_REMOVABLE_MEDIA_FILE_NAME;
@ -399,7 +405,17 @@ static void efi_block_unhook ( unsigned int drive ) {
* @ret rc Return status code
*/
static int efi_block_describe ( unsigned int drive ) {
static union {
/** ACPI header */
struct acpi_description_header acpi;
/** Padding */
char pad[768];
} xbftab;
static UINTN key;
struct san_device *sandev;
size_t len;
EFI_STATUS efirc;
int rc;
/* Find SAN device */
sandev = sandev_find ( drive );
@ -408,6 +424,59 @@ static int efi_block_describe ( unsigned int drive ) {
return -ENODEV;
}
/* Sanity check */
if ( ! acpi ) {
DBGC ( sandev, "EFIBLK %#02x has no ACPI table protocol\n",
sandev->drive );
return -ENOTSUP;
}
/* Remove existing table, if any */
if ( key ) {
if ( ( efirc = acpi->UninstallAcpiTable ( acpi, key ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( sandev, "EFIBLK %#02x could not uninstall ACPI "
"table: %s\n", sandev->drive, strerror ( rc ) );
/* Continue anyway */
}
key = 0;
}
/* Reopen block device if necessary */
if ( sandev_needs_reopen ( sandev ) &&
( ( rc = sandev_reopen ( sandev ) ) != 0 ) )
return rc;
/* Clear table */
memset ( &xbftab, 0, sizeof ( xbftab ) );
/* Fill in common parameters */
strncpy ( xbftab.acpi.oem_id, "FENSYS",
sizeof ( xbftab.acpi.oem_id ) );
strncpy ( xbftab.acpi.oem_table_id, "iPXE",
sizeof ( xbftab.acpi.oem_table_id ) );
/* Fill in remaining parameters */
if ( ( rc = acpi_describe ( &sandev->block, &xbftab.acpi,
sizeof ( xbftab ) ) ) != 0 ) {
DBGC ( sandev, "EFIBLK %#02x could not create ACPI "
"description: %s\n", sandev->drive, strerror ( rc ) );
return rc;
}
len = le32_to_cpu ( xbftab.acpi.length );
/* Fix up ACPI checksum */
acpi_fix_checksum ( &xbftab.acpi );
/* Install table */
if ( ( efirc = acpi->InstallAcpiTable ( acpi, &xbftab, len,
&key ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( sandev, "EFIBLK %#02x could not install ACPI table: "
"%s\n", sandev->drive, strerror ( rc ) );
return rc;
}
return 0;
}