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openprom(4d)
Device Drivers & /dev files openprom(4D)
NAME
openprom - PROM monitor configuration interface
SYNOPSIS
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/openpromio.h>
open("/dev/openprom", mode);
DESCRIPTION
The internal encoding of the configuration information stored in EEPROM
or NVRAM varies from model to model, and on some systems the encoding
is "hidden" by the firmware. The openprom driver provides a consistent
interface that allows a user or program to inspect and modify that con‐
figuration, using ioctl(2) requests. These requests are defined in
<sys/openpromio.h>:
struct openpromio {
uint_t oprom_size; /* real size of following data */
union {
char b[1]; /* NB: Adjacent, Null terminated */
int i;
} opio_u;
};
#define oprom_array opio_u.b /* property name/value array */
#define oprom_node opio_u.i /* nodeid from navigation config-ops */
#define oprom_len opio_u.i /* property len from OPROMGETPROPLEN */
#define OPROMMAXPARAM 32768 /* max size of array (advisory) */
For all ioctl(2) requests, the third parameter is a pointer to a struct
openpromio. All property names and values are null-terminated strings;
the value of a numeric option is its ASCII representation.
For the raw ioctl(2) operations shown below that explicitly or implic‐
itly specify a nodeid, an error may be returned. This is due to the
removal of the node from the firmware device tree by a Dynamic Recon‐
figuration operation. Programs should decide if the appropriate
response is to restart the scanning operation from the beginning or
terminate, informing the user that the tree has changed.
IOCTLS
OPROMGETOPT This ioctl takes the null-terminated name of a prop‐
erty in the oprom_array and returns its null-termi‐
nated value (overlaying its name). oprom_size should
be set to the size of oprom_array; on return it will
contain the size of the returned value. If the named
property does not exist, or if there is not enough
space to hold its value, then oprom_size will be set
to zero. See BUGS below.
OPROMSETOPT This ioctl takes two adjacent strings in
oprom_array; the null-terminated property name fol‐
lowed by the null-terminated value.
OPROMSETOPT2 This ioctl is similar to OPROMSETOPT, except that it
uses the difference between the actual user array
size and the length of the property name plus its
null terminator.
OPROMNXTOPT This ioctl is used to retrieve properties sequen‐
tially. The null-terminated name of a property is
placed into oprom_array and on return it is replaced
with the null-terminated name of the next property
in the sequence, with oprom_size set to its length.
A null string on input means return the name of the
first property; an oprom_size of zero on output
means there are no more properties.
OPROMNXT These ioctls provide an interface to the raw con‐
OPROMCHILD fig_ops operations in the PROM monitor. One can use
OPROMGETPROP them to traverse the system device tree; see prt‐
OPROMNXTPROP conf(8).
OPROMGETPROPLEN This ioctl provides an interface to the property
length raw config op. It takes the name of a prop‐
erty in the buffer, and returns an integer in the
buffer. It returns the integer -1 if the property
does not exist; 0 if the property exists, but has no
value (a boolean property); or a positive integer
which is the length of the property as reported by
the PROM monitor. See BUGS below.
OPROMGETVERSION This ioctl returns an arbitrary and platform-depen‐
dent NULL-terminated string in oprom_array, repre‐
senting the underlying version of the firmware.
ERRORS
EAGAIN There are too many opens of the /dev/openprom device.
EFAULT A bad address has been passed to an ioctl(2) routine.
EINVAL The size value was invalid, or (for OPROMSETOPT) the property
does not exist, or an invalid ioctl is being issued, or the
ioctl is not supported by the firmware, or the nodeid speci‐
fied does not exist in the firmware device tree.
ENOMEM The kernel could not allocate space to copy the user's struc‐
ture.
EPERM Attempts have been made to write to a read-only entity, or
read from a write only entity.
ENXIO Attempting to open a non-existent device.
EXAMPLES
Example 1 oprom_array Data Allocation and Reuse
The following example shows how the oprom_array is allocated and reused
for data returned by the driver.
/*
* This program opens the openprom device and prints the platform
* name (root node name property) and the prom version.
*
* NOTE: /dev/openprom is readable only by user 'root' or group 'sys'.
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/openpromio.h>
#define min(a, b) (a < b ? a : b)
#define max(a, b) (a > b ? a : b)
#define MAXNAMESZ 32 /* Maximum property *name* size */
#define BUFSZ 1024 /* A Handly default buffer size */
#define MAXVALSZ (BUFSZ - sizeof (int))
static char *promdev = "/dev/openprom";
/*
* Allocate an openpromio structure big enough to contain
* a bufsize'd oprom_array. Zero out the structure and
* set the oprom_size field to bufsize.
*/
static struct openpromio *
opp_zalloc(size_t bufsize)
{
struct openpromio *opp;
opp = malloc(sizeof (struct openpromio) + bufsize);
(void) memset(opp, 0, sizeof (struct openpromio) + bufsize);
opp->oprom_size = bufsize;
return (opp);
}
/*
* Free a 'struct openpromio' allocated by opp_zalloc
*/
static void
opp_free(struct openpromio *opp)
{
free(opp);
}
/*
* Get the peer node of the given node. The root node is the peer of zero.
* After changing nodes, property lookups apply to that node. The driver
* 'remembers' what node you are in.
*/
static int
peer(int nodeid, int fd)
{
struct openpromio *opp;
int i;
opp = opp_zalloc(sizeof (int));
opp->oprom_node = nodeid;
if (ioctl(fd, OPROMNEXT, opp) < 0) {
perror("OPROMNEXT");
exit(1);
}
i = opp->oprom_node;
opp_free(opp);
return(i);
}
int
main(void)
{
struct openpromio *opp;
int fd, proplen;
size_t buflen;
if ((fd = open(promdev, O_RDONLY)) < 0) {
fprintf(stderr, "Cannot open openprom device\n");
exit(1);
}
/*
* Get and print the length and value of the
* root node 'name' property
*/
(void) peer(0, fd); /* Navigate to the root node */
/*
* Allocate an openpromio structure sized big enough to
* take the string "name" as input and return the int-sized
* length of the 'name' property.
* Then, get the length of the 'name' property.
*/
buflen = max(sizeof (int), strlen("name") + 1);
opp = opp_zalloc(buflen);
(void) strcpy(opp->oprom_array, "name");
if (ioctl(fd, OPROMGETPROPLEN, opp) < 0) {
perror("OPROMGETPROPLEN");
/* exit(1); */
proplen = 0; /* down-rev driver? */
} else
proplen = opp->oprom_len;
opp_free(opp);
if (proplen == -1) {
printf("'name' property does not exist!\n");
exit (1);
}
/*
* Allocate an openpromio structure sized big enough
* to take the string 'name' as input and to return
* 'proplen + 1' bytes. Then, get the value of the
* 'name' property. Note how we make sure to size the
* array at least one byte more than the returned length
* to guarantee NULL termination.
*/
buflen = (proplen ? proplen + 1 : MAXVALSZ);
buflen = max(buflen, strlen("name") + 1);
opp = opp_zalloc(buflen);
(void) strcpy(opp->oprom_array, "name");
if (ioctl(fd, OPROMGETPROP, opp) < 0) {
perror("OPROMGETPROP");
exit(1);
}
if (opp->oprom_size != 0)
printf("Platform name <%s> property len <%d>\n",
opp->oprom_array, proplen);
opp_free(opp);
/*
* Allocate an openpromio structure assumed to be
* big enough to get the 'prom version string'.
* Get and print the prom version.
*/
opp_zalloc(MAXVALSZ);
opp->oprom_size = MAXVALSZ;
if (ioctl(fd, OPROMGETVERSION, opp) < 0) {
perror("OPROMGETVERSION");
exit(1);
}
printf("Prom version <%s>\n", opp->oprom_array);
opp_free(opp);
(void) close(fd);
return (0);
}
FILES
/dev/openprom PROM monitor configuration interface
SEE ALSO
ioctl(2), mem(4D), prtconf(8), eeprom(8)
BUGS
There should be separate return values for non-existent properties as
opposed to not enough space for the value.
An attempt to set a property to an illegal value results in the PROM
setting it to some legal value, with no error being returned. An
OPROMGETOPT should be performed after an OPROMSETOPT to verify that the
set worked.
Some PROMS lie about the property length of some string properties,
omitting the NULL terminator from the property length. The openprom
driver attempts to transparently compensate for these bugs when return‐
ing property values by NULL terminating an extra character in the user
buffer if space is available in the user buffer. This extra character
is excluded from the oprom_size field returned from OPROMGETPROP and
OPROMGETOPT and excluded in the oprom_len field returned from OPROMGET‐
PROPLEN but is returned in the user buffer from the calls that return
data, if the user buffer is allocated at least one byte larger than the
property length.
Oracle Solaris 11.4 25 Mar 2020 openprom(4D)