minix/lib/libsys/pci_dev_name.c

/*
pci_dev_name.c
*/

#include "pci.h"
#include "syslib.h"
#include <minix/sysutil.h>

/*===========================================================================*
 *				pci_dev_name				     *
 *===========================================================================*/
PUBLIC char *pci_dev_name(u16_t vid, u16_t did)
{
	static char name[PCIINFO_ENTRY_SIZE];	/* We need a better interface for this */

	int r;
	cp_grant_id_t gid;
	message m;

	gid= cpf_grant_direct(pci_procnr, (vir_bytes)name, sizeof(name),
		CPF_WRITE);
	if (gid == -1)
	{
		printf("pci_dev_name: cpf_grant_direct failed: %d\n",
			errno);
		return NULL;
	}

	m.m_type= BUSC_PCI_DEV_NAME_S;
	m.m7_i1= vid;
	m.m7_i2= did;
	m.m7_i3= sizeof(name);
	m.m7_i4= gid;

	r= sendrec(pci_procnr, &m);
	cpf_revoke(gid);
	if (r != 0)
		panic("pci_dev_name: can't talk to PCI: %d", r);

	if (m.m_type == ENOENT)
	{
#if DEBUG
		printf("pci_dev_name: got no name\n");
#endif
		return NULL;	/* No name for this device */
	}
	if (m.m_type != 0)
		panic("pci_dev_name: got bad reply from PCI: %d", m.m_type);

	name[sizeof(name)-1]= '\0';	/* Make sure that the string is NUL
					 * terminated.
					 */

#if DEBUG
	printf("pci_dev_name: got name %s\n", name);
#endif
	return name;
}