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ieee1275: no-data-command bus specific method

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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.

Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Daniel Kiper 2018-03-05 15:11:18 +01:00
parent f02037afe3
commit c422bb6019
2 changed files with 54 additions and 0 deletions
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51
grub-core/kern/ieee1275/ieee1275.c
View file

@ -733,3 +733,54 @@ grub_ieee1275_set_address (grub_ieee1275_ihandle_t ihandle,
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;
}

3
include/grub/ieee1275/ieee1275.h
View file

@ -213,6 +213,9 @@ int EXPORT_FUNC(grub_ieee1275_milliseconds) (grub_uint32_t *msecs);
int EXPORT_FUNC(grub_ieee1275_set_address) (grub_ieee1275_ihandle_t ihandle,
grub_uint32_t target,
grub_uint32_t lun);
int EXPORT_FUNC(grub_ieee1275_no_data_command) (grub_ieee1275_ihandle_t ihandle,
const void *cmd_addr,
grub_ssize_t *result);
int EXPORT_FUNC(grub_ieee1275_decode_unit4) (grub_ieee1275_ihandle_t ihandle,
void *addr, grub_size_t size,
grub_uint32_t *phy_lo,