1 /* 2 * Copyright 2007, François Revol, revol@free.fr. 3 * Distributed under the terms of the MIT License. 4 * 5 * Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de. 6 * Distributed under the terms of the MIT License. 7 * 8 * Copyright 2001, Travis Geiselbrecht. All rights reserved. 9 * Distributed under the terms of the NewOS License. 10 */ 11 12 13 #include <KernelExport.h> 14 15 #include <kernel.h> 16 #include <boot/kernel_args.h> 17 18 #include <vm/vm.h> 19 #include <vm/VMAddressSpace.h> 20 #include <vm/vm_types.h> 21 #include <arch/vm.h> 22 //#include <arch_mmu.h> 23 24 25 //#define TRACE_ARCH_VM 26 #ifdef TRACE_ARCH_VM 27 # define TRACE(x) dprintf x 28 #else 29 # define TRACE(x) ; 30 #endif 31 32 33 status_t 34 arch_vm_init(kernel_args *args) 35 { 36 TRACE(("arch_vm_init: entry\n")); 37 return B_OK; 38 } 39 40 41 status_t 42 arch_vm_init2(kernel_args *args) 43 { 44 return B_OK; 45 } 46 47 48 status_t 49 arch_vm_init_post_area(kernel_args *args) 50 { 51 TRACE(("arch_vm_init_post_area: entry\n")); 52 return B_OK; 53 } 54 55 56 status_t 57 arch_vm_init_end(kernel_args *args) 58 { 59 TRACE(("arch_vm_init_end(): %" B_PRIu32 " virtual ranges to keep:\n", 60 args->arch_args.num_virtual_ranges_to_keep)); 61 62 for (int i = 0; i < (int)args->arch_args.num_virtual_ranges_to_keep; i++) { 63 addr_range &range = args->arch_args.virtual_ranges_to_keep[i]; 64 65 TRACE((" start: %p, size: %#" B_PRIxSIZE "\n", (void*)range.start, range.size)); 66 67 // skip ranges outside the kernel address space 68 if (!IS_KERNEL_ADDRESS(range.start)) { 69 TRACE((" no kernel address, skipping...\n")); 70 continue; 71 } 72 73 phys_addr_t physicalAddress; 74 void *address = (void*)range.start; 75 if (vm_get_page_mapping(VMAddressSpace::KernelID(), range.start, 76 &physicalAddress) != B_OK) 77 panic("arch_vm_init_end(): No page mapping for %p\n", address); 78 79 area_id area = vm_map_physical_memory(VMAddressSpace::KernelID(), 80 "boot loader reserved area", &address, 81 B_EXACT_ADDRESS, range.size, 82 B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA, 83 physicalAddress, true); 84 85 if (area < 0) { 86 panic("arch_vm_init_end(): Failed to create area for boot loader " 87 "reserved area: %p - %p\n", (void*)range.start, 88 (void*)(range.start + range.size)); 89 } 90 } 91 92 // Throw away all mappings that are unused by the kernel 93 vm_free_unused_boot_loader_range(KERNEL_LOAD_BASE, KERNEL_SIZE); 94 95 return B_OK; 96 } 97 98 99 status_t 100 arch_vm_init_post_modules(kernel_args *args) 101 { 102 return B_OK; 103 } 104 105 106 void 107 arch_vm_aspace_swap(struct VMAddressSpace *from, struct VMAddressSpace *to) 108 { 109 // This functions is only invoked when a userland thread is in the process 110 // of dying. It switches to the kernel team and does whatever cleanup is 111 // necessary (in case it is the team's main thread, it will delete the 112 // team). 113 // It is however not necessary to change the page directory. Userland team's 114 // page directories include all kernel mappings as well. Furthermore our 115 // arch specific translation map data objects are ref-counted, so they won't 116 // go away as long as they are still used on any CPU. 117 } 118 119 120 bool 121 arch_vm_supports_protection(uint32 protection) 122 { 123 // TODO check ARM protection possibilities 124 return true; 125 } 126 127 128 void 129 arch_vm_unset_memory_type(VMArea *area) 130 { 131 } 132 133 134 status_t 135 arch_vm_set_memory_type(VMArea *area, phys_addr_t physicalBase, uint32 type) 136 { 137 return B_OK; 138 } 139