/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ * */ #include <debug.h> #include <mach/vm_param.h> #include <vm/vm_kern.h> #include <vm/vm_map.h> #include <vm/vm_page.h> #include <ppc/pmap.h> #include <ppc/io_map_entries.h> #include <ppc/Firmware.h> #include <ppc/mappings.h> #include <ppc/proc_reg.h> extern vm_offset_t virtual_avail; /* * Allocate and map memory for devices that may need to be mapped * outside the usual physical memory. If phys_addr is NULL then * steal the appropriate number of physical pages from the vm * system and map them. */ vm_offset_t io_map(phys_addr, size) vm_offset_t phys_addr; vm_size_t size; { vm_offset_t start; int i; unsigned int j; vm_page_t m; #if DEBUG assert (kernel_map != VM_MAP_NULL); /* VM must be initialised */ #endif if (phys_addr != 0) { /* make sure we map full contents of all the pages concerned */ size = round_page(size + (phys_addr & PAGE_MASK)); /* Steal some free virtual addresses */ (void) kmem_alloc_pageable(kernel_map, &start, size); pmap_map_block(kernel_pmap, start, phys_addr, size, VM_PROT_READ|VM_PROT_WRITE, PTE_WIMG_IO, 0); /* Set up a block mapped area */ return (start + (phys_addr & PAGE_MASK)); } else { /* Steal some free virtual addresses */ (void) kmem_alloc_pageable(kernel_map, &start, size); mapping_prealloc(size); /* Make sure there are enough free mappings */ /* Steal some physical pages and map them one by one */ for (i = 0; i < size ; i += PAGE_SIZE) { m = VM_PAGE_NULL; while ((m = vm_page_grab()) == VM_PAGE_NULL) VM_PAGE_WAIT(); vm_page_gobble(m); (void) pmap_map_bd(start + i, m->phys_addr, m->phys_addr + PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE); } mapping_relpre(); /* Allow mapping release */ return start; } }