1 /* $Id: devmap.c,v 1.2 1995/11/25 00:59:56 davem Exp $ 2 * promdevmap.c: Map device/IO areas to virtual addresses. 3 * 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 */ 6 7 #include <asm/openprom.h> 8 #include <asm/oplib.h> 9 10 /* Just like the routines in palloc.c, these should not be used 11 * by the kernel at all. Bootloader facility mainly. And again, 12 * this is only available on V2 proms and above. 13 */ 14 15 /* Map physical device address 'paddr' in IO space 'ios' of size 16 * 'num_bytes' to a virtual address, with 'vhint' being a hint to 17 * the prom as to where you would prefer the mapping. We return 18 * where the prom actually mapped it. 19 */ 20 char * 21 prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes) /* */ 22 { 23 if((num_bytes == 0) || (paddr == 0)) return (char *) 0x0; 24 return (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr, 25 num_bytes); 26 } 27 28 /* Unmap an IO/device area that was mapped using the above routine. */ 29 void 30 prom_unmapio(char *vaddr, unsigned int num_bytes) /* */ 31 { 32 if(num_bytes == 0x0) return; 33 (*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes); 34 return; 35 }