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- #include "etherboot.h"
- #include "isa.h"
-
- /*
- * isa.c implements a "classical" port-scanning method of ISA device
- * detection. The driver must provide a list of probe addresses
- * (probe_addrs), together with a function (probe_addr) that can be
- * used to test for the physical presence of a device at any given
- * address.
- *
- * Note that this should probably be considered the "last resort" for
- * device probing. If the card supports ISAPnP or EISA, use that
- * instead. Some cards (e.g. the 3c509) implement a proprietary
- * ISAPnP-like mechanism.
- *
- * The ISA probe address list can be overridden by config.c; if
- */
-
- /*
- * Ensure that there is sufficient space in the shared dev_bus
- * structure for a struct isa_device.
- *
- */
- DEV_BUS( struct isa_device, isa_dev );
- static char isa_magic[0]; /* guaranteed unique symbol */
-
- /*
- * Find an ISA device matching the specified driver
- *
- */
- int find_isa_device ( struct isa_device *isa, struct isa_driver *driver ) {
- unsigned int i;
- uint16_t ioaddr;
-
- /* Initialise struct isa if it's the first time it's been used. */
- if ( isa->magic != isa_magic ) {
- memset ( isa, 0, sizeof ( *isa ) );
- isa->magic = isa_magic;
- }
-
- /* Iterate through any ISA probe addresses specified by
- * config.c, starting where we left off.
- */
- for ( i = isa->probe_idx ; i < isa_extra_probe_addr_count ; i++ ) {
- /* If we've already used this device, skip it */
- if ( isa->already_tried ) {
- isa->already_tried = 0;
- continue;
- }
-
- /* Set I/O address */
- ioaddr = isa_extra_probe_addrs[i].addr;
-
- /* An I/O address of 0 in extra_probe_addrs list means
- * stop probing (i.e. don't continue to the
- * driver-provided list)
- */
- if ( ! ioaddr )
- goto notfound;
-
- /* Use probe_addr method to see if there's a device
- * present at this address.
- */
- if ( driver->probe_addr ( ioaddr ) ) {
- isa->probe_idx = i;
- goto found;
- }
- }
-
- /* Iterate through all ISA probe addresses provided by the
- * driver, starting where we left off.
- */
- for ( i = isa->probe_idx - isa_extra_probe_addr_count ;
- i < driver->addr_count ; i++ ) {
-
- /* If we've already used this device, skip it */
- if ( isa->already_tried ) {
- isa->already_tried = 0;
- continue;
- }
-
- /* Set I/O address */
- ioaddr = driver->probe_addrs[i].addr;
-
- /* Use probe_addr method to see if there's a device
- * present at this address.
- */
- if ( driver->probe_addr ( ioaddr ) ) {
- isa->probe_idx = i + isa_extra_probe_addr_count;
- goto found;
- }
- }
-
- notfound:
- /* No device found */
- isa->probe_idx = 0;
- return 0;
-
- found:
- DBG ( "ISA found %s device at address %hx\n", driver->name, ioaddr );
- isa->ioaddr = ioaddr;
- isa->already_tried = 1;
- return 1;
- }
-
- /*
- * Find the next ISA device that can be used to boot using the
- * specified driver.
- *
- */
- int find_isa_boot_device ( struct dev *dev, struct isa_driver *driver ) {
- struct isa_device *isa = ( struct isa_device * )dev->bus;
-
- if ( ! find_isa_device ( isa, driver ) )
- return 0;
-
- dev->name = driver->name;
- dev->devid.bus_type = ISA_BUS_TYPE;
- dev->devid.vendor_id = driver->mfg_id;
- dev->devid.device_id = driver->prod_id;
-
- return 1;
- }
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