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grub/grub-core/kern/ieee1275/ieee1275.c
Sudhakar Kuppusamy 76158ed1ad powerpc/ieee1275: Read the db and dbx secure boot variables 
Enhancing the infrastructure to enable the Platform Keystore (PKS) feature,
which provides access to the SB_VERSION, db, and dbx secure boot variables
from PKS.

If PKS is enabled, it will read secure boot variables such as db and dbx
from PKS and extract EFI Signature List (ESL) from it. The ESLs would be
saved in the Platform Keystore buffer, and the appendedsig module would
read it later to extract the certificate's details from ESL.

In the following scenarios, static key management mode will be activated:
 1. When Secure Boot is enabled with static key management mode
 2. When SB_VERSION is unavailable but Secure Boot is enabled
 3. When PKS support is unavailable but Secure Boot is enabled

Note:

 SB_VERSION: Key Management Mode
 1 - Enable dynamic key management mode. Read the db and dbx variables from PKS,
     and use them for signature verification.
 0 - Enable static key management mode. Read keys from the GRUB ELF Note and
     use it for signature verification.

Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Avnish Chouhan <avnish@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2025-10-11 15:36:46 +02:00

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/* of.c - Access the Open Firmware client interface. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/ieee1275/ieee1275.h>
#include <grub/types.h>
#include <grub/misc.h>
#define IEEE1275_PHANDLE_INVALID ((grub_ieee1275_cell_t) -1)
#define IEEE1275_IHANDLE_INVALID ((grub_ieee1275_cell_t) 0)
int
grub_ieee1275_finddevice (const char *name, grub_ieee1275_phandle_t *phandlep)
{
struct find_device_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t device;
grub_ieee1275_cell_t phandle;
}
args;
INIT_IEEE1275_COMMON (&args.common, "finddevice", 1, 1);
args.device = (grub_ieee1275_cell_t) name;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*phandlep = args.phandle;
if (args.phandle == IEEE1275_PHANDLE_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_get_property (grub_ieee1275_phandle_t phandle,
const char *property, void *buf,
grub_size_t size, grub_ssize_t *actual)
{
struct get_property_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t phandle;
grub_ieee1275_cell_t prop;
grub_ieee1275_cell_t buf;
grub_ieee1275_cell_t buflen;
grub_ieee1275_cell_t size;
}
args;
INIT_IEEE1275_COMMON (&args.common, "getprop", 4, 1);
args.phandle = phandle;
args.prop = (grub_ieee1275_cell_t) property;
args.buf = (grub_ieee1275_cell_t) buf;
args.buflen = (grub_ieee1275_cell_t) size;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (actual)
*actual = (grub_ssize_t) args.size;
if (args.size == IEEE1275_CELL_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_get_integer_property (grub_ieee1275_phandle_t phandle,
const char *property, grub_uint32_t *buf,
grub_size_t size, grub_ssize_t *actual)
{
int ret;
ret = grub_ieee1275_get_property (phandle, property, (void *) buf, size, actual);
#ifndef GRUB_CPU_WORDS_BIGENDIAN
/* Integer properties are always in big endian. */
if (ret == 0)
{
unsigned int i;
size /= sizeof (grub_uint32_t);
for (i = 0; i < size; i++)
buf[i] = grub_be_to_cpu32 (buf[i]);
}
#endif
return ret;
}
int
grub_ieee1275_next_property (grub_ieee1275_phandle_t phandle, char *prev_prop,
char *prop)
{
struct get_property_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t phandle;
grub_ieee1275_cell_t prev_prop;
grub_ieee1275_cell_t next_prop;
grub_ieee1275_cell_t flags;
}
args;
INIT_IEEE1275_COMMON (&args.common, "nextprop", 3, 1);
args.phandle = phandle;
args.prev_prop = (grub_ieee1275_cell_t) prev_prop;
args.next_prop = (grub_ieee1275_cell_t) prop;
args.flags = (grub_ieee1275_cell_t) -1;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
return (int) args.flags;
}
int
grub_ieee1275_get_property_length (grub_ieee1275_phandle_t phandle,
const char *prop, grub_ssize_t *length)
{
struct get_property_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t phandle;
grub_ieee1275_cell_t prop;
grub_ieee1275_cell_t length;
}
args;
INIT_IEEE1275_COMMON (&args.common, "getproplen", 2, 1);
args.phandle = phandle;
args.prop = (grub_ieee1275_cell_t) prop;
args.length = (grub_ieee1275_cell_t) -1;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*length = args.length;
if (args.length == IEEE1275_CELL_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_instance_to_package (grub_ieee1275_ihandle_t ihandle,
grub_ieee1275_phandle_t *phandlep)
{
struct instance_to_package_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t phandle;
}
args;
INIT_IEEE1275_COMMON (&args.common, "instance-to-package", 1, 1);
args.ihandle = ihandle;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*phandlep = args.phandle;
if (args.phandle == IEEE1275_PHANDLE_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_package_to_path (grub_ieee1275_phandle_t phandle,
char *path, grub_size_t len,
grub_ssize_t *actual)
{
struct instance_to_package_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t phandle;
grub_ieee1275_cell_t buf;
grub_ieee1275_cell_t buflen;
grub_ieee1275_cell_t actual;
}
args;
INIT_IEEE1275_COMMON (&args.common, "package-to-path", 3, 1);
args.phandle = phandle;
args.buf = (grub_ieee1275_cell_t) path;
args.buflen = (grub_ieee1275_cell_t) len;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (actual)
*actual = args.actual;
if (args.actual == IEEE1275_CELL_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_instance_to_path (grub_ieee1275_ihandle_t ihandle,
char *path, grub_size_t len,
grub_ssize_t *actual)
{
struct instance_to_path_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t buf;
grub_ieee1275_cell_t buflen;
grub_ieee1275_cell_t actual;
}
args;
INIT_IEEE1275_COMMON (&args.common, "instance-to-path", 3, 1);
args.ihandle = ihandle;
args.buf = (grub_ieee1275_cell_t) path;
args.buflen = (grub_ieee1275_cell_t) len;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (actual)
*actual = args.actual;
if (args.actual == IEEE1275_CELL_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_write (grub_ieee1275_ihandle_t ihandle, const void *buffer,
grub_size_t len, grub_ssize_t *actualp)
{
struct write_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t buf;
grub_ieee1275_cell_t len;
grub_ieee1275_cell_t actual;
}
args;
INIT_IEEE1275_COMMON (&args.common, "write", 3, 1);
args.ihandle = ihandle;
args.buf = (grub_ieee1275_cell_t) buffer;
args.len = (grub_ieee1275_cell_t) len;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (actualp)
*actualp = args.actual;
return 0;
}
int
grub_ieee1275_read (grub_ieee1275_ihandle_t ihandle, void *buffer,
grub_size_t len, grub_ssize_t *actualp)
{
struct write_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t buf;
grub_ieee1275_cell_t len;
grub_ieee1275_cell_t actual;
}
args;
INIT_IEEE1275_COMMON (&args.common, "read", 3, 1);
args.ihandle = ihandle;
args.buf = (grub_ieee1275_cell_t) buffer;
args.len = (grub_ieee1275_cell_t) len;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (actualp)
*actualp = args.actual;
return 0;
}
int
grub_ieee1275_seek (grub_ieee1275_ihandle_t ihandle, grub_disk_addr_t pos,
grub_ssize_t *result)
{
struct write_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t pos_hi;
grub_ieee1275_cell_t pos_lo;
grub_ieee1275_cell_t result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "seek", 3, 1);
args.ihandle = ihandle;
/* To prevent stupid gcc warning. */
#if GRUB_IEEE1275_CELL_SIZEOF >= 8
args.pos_hi = 0;
args.pos_lo = pos;
#else
args.pos_hi = (grub_ieee1275_cell_t) (pos >> (8 * GRUB_IEEE1275_CELL_SIZEOF));
args.pos_lo = (grub_ieee1275_cell_t)
(pos & ((1ULL << (8 * GRUB_IEEE1275_CELL_SIZEOF)) - 1));
#endif
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (result)
*result = args.result;
return 0;
}
int
grub_ieee1275_peer (grub_ieee1275_phandle_t node,
grub_ieee1275_phandle_t *result)
{
struct peer_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t node;
grub_ieee1275_cell_t result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "peer", 1, 1);
args.node = node;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*result = args.result;
if (args.result == 0)
return -1;
return 0;
}
int
grub_ieee1275_child (grub_ieee1275_phandle_t node,
grub_ieee1275_phandle_t *result)
{
struct child_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t node;
grub_ieee1275_cell_t result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "child", 1, 1);
args.node = node;
args.result = IEEE1275_PHANDLE_INVALID;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*result = args.result;
if (args.result == 0)
return -1;
return 0;
}
int
grub_ieee1275_parent (grub_ieee1275_phandle_t node,
grub_ieee1275_phandle_t *result)
{
struct parent_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t node;
grub_ieee1275_cell_t result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "parent", 1, 1);
args.node = node;
args.result = IEEE1275_PHANDLE_INVALID;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*result = args.result;
return 0;
}
int
grub_ieee1275_interpret (const char *command, grub_ieee1275_cell_t *catch)
{
struct enter_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t command;
grub_ieee1275_cell_t catch;
}
args;
INIT_IEEE1275_COMMON (&args.common, "interpret", 1, 1);
args.command = (grub_ieee1275_cell_t) command;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (catch)
*catch = args.catch;
return 0;
}
int
grub_ieee1275_enter (void)
{
struct enter_args
{
struct grub_ieee1275_common_hdr common;
}
args;
INIT_IEEE1275_COMMON (&args.common, "enter", 0, 0);
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
return 0;
}
void
grub_ieee1275_exit (void)
{
struct exit_args
{
struct grub_ieee1275_common_hdr common;
}
args;
INIT_IEEE1275_COMMON (&args.common, "exit", 0, 0);
IEEE1275_CALL_ENTRY_FN (&args);
for (;;) ;
}
int
grub_ieee1275_open (const char *path, grub_ieee1275_ihandle_t *result)
{
struct open_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t path;
grub_ieee1275_cell_t result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "open", 1, 1);
args.path = (grub_ieee1275_cell_t) path;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*result = args.result;
if (args.result == IEEE1275_IHANDLE_INVALID)
return -1;
return 0;
}
int
grub_ieee1275_close (grub_ieee1275_ihandle_t ihandle)
{
struct close_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t ihandle;
}
args;
INIT_IEEE1275_COMMON (&args.common, "close", 1, 0);
args.ihandle = ihandle;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
return 0;
}
int
grub_ieee1275_decode_unit4 (grub_ieee1275_ihandle_t ihandle,
void *addr, grub_size_t size,
grub_uint32_t *phy_lo, grub_uint32_t *phy_hi,
grub_uint32_t *lun_lo, grub_uint32_t *lun_hi)
{
struct decode_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t size;
grub_ieee1275_cell_t addr;
grub_ieee1275_cell_t catch_result;
grub_ieee1275_cell_t tgt_h;
grub_ieee1275_cell_t tgt_l;
grub_ieee1275_cell_t lun_h;
grub_ieee1275_cell_t lun_l;
}
args;
INIT_IEEE1275_COMMON (&args.common, "call-method", 4, 5);
args.method = (grub_ieee1275_cell_t) "decode-unit";
args.ihandle = ihandle;
args.size = size;
args.addr = (grub_ieee1275_cell_t) addr;
args.catch_result = 1;
if ((IEEE1275_CALL_ENTRY_FN (&args) == -1) || (args.catch_result))
{
grub_error (GRUB_ERR_OUT_OF_RANGE, "decode-unit failed\n");
return -1;
}
*phy_lo = args.tgt_l;
*phy_hi = args.tgt_h;
*lun_lo = args.lun_l;
*lun_hi = args.lun_h;
return 0;
}
char *
grub_ieee1275_encode_uint4 (grub_ieee1275_ihandle_t ihandle,
grub_uint32_t phy_lo, grub_uint32_t phy_hi,
grub_uint32_t lun_lo, grub_uint32_t lun_hi,
grub_size_t *size)
{
char *addr;
struct encode_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t tgt_h;
grub_ieee1275_cell_t tgt_l;
grub_ieee1275_cell_t lun_h;
grub_ieee1275_cell_t lun_l;
grub_ieee1275_cell_t catch_result;
grub_ieee1275_cell_t size;
grub_ieee1275_cell_t addr;
}
args;
INIT_IEEE1275_COMMON (&args.common, "call-method", 6, 3);
args.method = (grub_ieee1275_cell_t) "encode-unit";
args.ihandle = ihandle;
args.tgt_l = phy_lo;
args.tgt_h = phy_hi;
args.lun_l = lun_lo;
args.lun_h = lun_hi;
args.catch_result = 1;
if ((IEEE1275_CALL_ENTRY_FN (&args) == -1) || (args.catch_result))
{
grub_error (GRUB_ERR_OUT_OF_RANGE, "encode-unit failed\n");
return 0;
}
addr = (void *)args.addr;
*size = args.size;
addr = grub_strdup ((char *)args.addr);
return addr;
}
int
grub_ieee1275_claim (grub_addr_t addr, grub_size_t size, unsigned int align,
grub_addr_t *result)
{
struct claim_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t addr;
grub_ieee1275_cell_t size;
grub_ieee1275_cell_t align;
grub_ieee1275_cell_t base;
}
args;
INIT_IEEE1275_COMMON (&args.common, "claim", 3, 1);
args.addr = (grub_ieee1275_cell_t) addr;
args.size = (grub_ieee1275_cell_t) size;
args.align = (grub_ieee1275_cell_t) align;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (result)
*result = args.base;
if (args.base == IEEE1275_CELL_INVALID)
return -1;
grub_dprintf ("mmap", "CLAIMED: 0x%" PRIxGRUB_IEEE1275_CELL_T " (%"
PRIuGRUB_IEEE1275_CELL_T " MiB) size: %" PRIuGRUB_SIZE " MiB\n",
args.base, args.base >> 20, ALIGN_UP (size, 1 << 20) >> 20);
return 0;
}
int
grub_ieee1275_release (grub_addr_t addr, grub_size_t size)
{
struct release_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t addr;
grub_ieee1275_cell_t size;
}
args;
INIT_IEEE1275_COMMON (&args.common, "release", 2, 0);
args.addr = addr;
args.size = size;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
return 0;
}
int
grub_ieee1275_set_property (grub_ieee1275_phandle_t phandle,
const char *propname, const void *buf,
grub_size_t size, grub_ssize_t *actual)
{
struct set_property_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t phandle;
grub_ieee1275_cell_t propname;
grub_ieee1275_cell_t buf;
grub_ieee1275_cell_t size;
grub_ieee1275_cell_t actual;
}
args;
INIT_IEEE1275_COMMON (&args.common, "setprop", 4, 1);
args.size = (grub_ieee1275_cell_t) size;
args.buf = (grub_ieee1275_cell_t) buf;
args.propname = (grub_ieee1275_cell_t) propname;
args.phandle = (grub_ieee1275_cell_t) phandle;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*actual = args.actual;
if ((args.actual == IEEE1275_CELL_INVALID) || (args.actual != args.size))
return -1;
return 0;
}
int
grub_ieee1275_set_color (grub_ieee1275_ihandle_t ihandle,
int index, int r, int g, int b)
{
struct set_color_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t index;
grub_ieee1275_cell_t b;
grub_ieee1275_cell_t g;
grub_ieee1275_cell_t r;
grub_ieee1275_cell_t catch_result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "call-method", 6, 1);
args.method = (grub_ieee1275_cell_t) "color!";
args.ihandle = ihandle;
args.index = index;
args.r = r;
args.g = g;
args.b = b;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
return args.catch_result;
}
int
grub_ieee1275_milliseconds (grub_uint32_t *msecs)
{
struct milliseconds_args
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t msecs;
}
args;
INIT_IEEE1275_COMMON (&args.common, "milliseconds", 0, 1);
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
*msecs = args.msecs;
return 0;
}
int
grub_ieee1275_set_address (grub_ieee1275_ihandle_t ihandle,
grub_uint32_t target, grub_uint32_t lun)
{
struct set_address
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t tgt;
grub_ieee1275_cell_t lun;
grub_ieee1275_cell_t catch_result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "call-method", 4, 1);
/*
* IEEE 1275-1994 Standard for Boot (Initialization Configuration)
* Firmware: Core Requirements and Practices
* E.3.2.2 Bus-specific methods for bus nodes
*
* A package implementing the scsi-2 device type shall implement the
* following bus-specific method:
*
* set-address ( unit# target# -- )
* Sets the SCSI target number (0x0..0xf) and unit number (0..7) to which
* subsequent commands apply.
*/
args.method = (grub_ieee1275_cell_t) "set-address";
args.ihandle = ihandle;
args.tgt = target;
args.lun = lun;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
return args.catch_result;
}
int
grub_ieee1275_no_data_command (grub_ieee1275_ihandle_t ihandle,
const void *cmd_addr, grub_ssize_t *result)
{
struct set_address
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t cmd_addr;
grub_ieee1275_cell_t error;
grub_ieee1275_cell_t catch_result;
}
args;
INIT_IEEE1275_COMMON (&args.common, "call-method", 3, 2);
/*
* IEEE 1275-1994 Standard for Boot (Initialization Configuration)
* Firmware: Core Requirements and Practices
*
* E.3.2.2 Bus-specific methods for bus nodes
*
* A package implementing the scsi-2 device type shall implement the
* following bus-specific method:
*
* no-data-command ( cmd-addr -- error? )
* Executes a simple SCSI command, automatically retrying under
* certain conditions. cmd-addr is the address of a 6-byte command buffer
* containing an SCSI command that does not have a data transfer phase.
* Executes the command, retrying indefinitely with the same retry criteria
* as retry-command.
*
* error? is nonzero if an error occurred, zero otherwise.
* NOTE no-data-command is a convenience function. It provides
* no capabilities that are not present in retry-command, but for
* those commands that meet its restrictions, it is easier to use.
*/
args.method = (grub_ieee1275_cell_t) "no-data-command";
args.ihandle = ihandle;
args.cmd_addr = (grub_ieee1275_cell_t) cmd_addr;
if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
return -1;
if (result)
*result = args.error;
return args.catch_result;
}
int
grub_ieee1275_get_block_size (grub_ieee1275_ihandle_t ihandle)
{
struct size_args_ieee1275
{
struct grub_ieee1275_common_hdr common;
grub_ieee1275_cell_t method;
grub_ieee1275_cell_t ihandle;
grub_ieee1275_cell_t result;
grub_ieee1275_cell_t size;
} args;
INIT_IEEE1275_COMMON (&args.common, "call-method", 2, 2);
args.method = (grub_ieee1275_cell_t) "block-size";
args.ihandle = ihandle;
args.result = 1;
if ((IEEE1275_CALL_ENTRY_FN (&args) == -1) || (args.result))
return 0;
return args.size;
}
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