osfmk/i386/phys.c

   1 /*
   2  * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56
  57 #include <mach_debug.h>
  58 #include <mach_ldebug.h>
  59
  60 #include <sys/kdebug.h>
  61
  62 #include <mach/kern_return.h>
  63 #include <mach/thread_status.h>
  64 #include <mach/vm_param.h>
  65
  66 #include <kern/counters.h>
  67 #include <kern/mach_param.h>
  68 #include <kern/task.h>
  69 #include <kern/thread.h>
  70 #include <kern/sched_prim.h>
  71 #include <kern/misc_protos.h>
  72 #include <kern/assert.h>
  73 #include <kern/spl.h>
  74 #include <ipc/ipc_port.h>
  75 #include <vm/vm_kern.h>
  76 #include <vm/vm_map.h>
  77 #include <vm/pmap.h>
  78
  79 #include <i386/cpu_data.h>
  80 #include <i386/cpu_number.h>
  81 #include <i386/thread.h>
  82 #include <i386/eflags.h>
  83 #include <i386/proc_reg.h>
  84 #include <i386/seg.h>
  85 #include <i386/tss.h>
  86 #include <i386/user_ldt.h>
  87 #include <i386/fpu.h>
  88 #include <i386/misc_protos.h>
  89
  90 /*
  91  *      pmap_zero_page zeros the specified (machine independent) page.
  92  */
  93 void
  94 pmap_zero_page(
  95        ppnum_t pn)
  96 {
  97         assert(pn != vm_page_fictitious_addr);
  98         assert(pn != vm_page_guard_addr);
  99         bzero_phys((addr64_t)i386_ptob(pn), PAGE_SIZE);
 100 }
 101
 102 /*
 103  *      pmap_zero_part_page
 104  *      zeros the specified (machine independent) part of a page.
 105  */
 106 void
 107 pmap_zero_part_page(
 108         ppnum_t         pn,
 109         vm_offset_t     offset,
 110         vm_size_t       len)
 111 {
 112         assert(pn != vm_page_fictitious_addr);
 113         assert(pn != vm_page_guard_addr);
 114         assert(offset + len <= PAGE_SIZE);
 115         bzero_phys((addr64_t)(i386_ptob(pn) + offset), (uint32_t)len);
 116 }
 117
 118 /*
 119  *      pmap_copy_page copies the specified (machine independent) pages.
 120  */
 121 void
 122 pmap_copy_part_page(
 123         ppnum_t         psrc,
 124         vm_offset_t     src_offset,
 125         ppnum_t         pdst,
 126         vm_offset_t     dst_offset,
 127         vm_size_t       len)
 128 {
 129         pmap_paddr_t src, dst;
 130
 131         assert(psrc != vm_page_fictitious_addr);
 132         assert(pdst != vm_page_fictitious_addr);
 133         assert(psrc != vm_page_guard_addr);
 134         assert(pdst != vm_page_guard_addr);
 135
 136         src = i386_ptob(psrc);
 137         dst = i386_ptob(pdst);
 138
 139         assert((((uintptr_t)dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
 140         assert((((uintptr_t)src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
 141
 142         bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
 143                    (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
 144                    len);
 145 }
 146
 147 /*
 148  *      pmap_copy_part_lpage copies part of a virtually addressed page
 149  *      to a physically addressed page.
 150  */
 151 void
 152 pmap_copy_part_lpage(
 153         __unused vm_offset_t    src,
 154         __unused ppnum_t        pdst,
 155         __unused vm_offset_t    dst_offset,
 156         __unused vm_size_t      len)
 157 {
 158
 159         assert(pdst != vm_page_fictitious_addr);
 160         assert(pdst != vm_page_guard_addr);
 161         assert((dst_offset + len) <= PAGE_SIZE);
 162
 163 }
 164
 165 /*
 166  *      pmap_copy_part_rpage copies part of a physically addressed page
 167  *      to a virtually addressed page.
 168  */
 169 void
 170 pmap_copy_part_rpage(
 171         __unused ppnum_t                psrc,
 172         __unused vm_offset_t    src_offset,
 173         __unused vm_offset_t    dst,
 174         __unused vm_size_t      len)
 175 {
 176
 177         assert(psrc != vm_page_fictitious_addr);
 178         assert(psrc != vm_page_guard_addr);
 179         assert((src_offset + len) <= PAGE_SIZE);
 180
 181 }
 182
 183 /*
 184  *      kvtophys(addr)
 185  *
 186  *      Convert a kernel virtual address to a physical address
 187  */
 188 addr64_t
 189 kvtophys(
 190         vm_offset_t addr)
 191 {
 192         pmap_paddr_t pa;
 193
 194         pa = ((pmap_paddr_t)pmap_find_phys(kernel_pmap, addr)) << INTEL_PGSHIFT;
 195         if (pa)
 196                 pa |= (addr & INTEL_OFFMASK);
 197
 198         return ((addr64_t)pa);
 199 }
 200
 201 extern pt_entry_t *debugger_ptep;
 202 extern vm_map_offset_t debugger_window_kva;
 203 extern int _bcopy(const void *, void *, vm_size_t);
 204 extern int _bcopy2(const void *, void *);
 205 extern int _bcopy4(const void *, void *);
 206 extern int _bcopy8(const void *, void *);
 207
 208 __private_extern__ int ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes) {
 209         void *src, *dst;
 210         int err = 0;
 211
 212         mp_disable_preemption();
 213 #if NCOPY_WINDOWS > 0
 214         mapwindow_t *src_map, *dst_map;
 215         /* We rely on MTRRs here */
 216         src_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | ((pmap_paddr_t)src64 & PG_FRAME) | INTEL_PTE_REF));
 217         dst_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | ((pmap_paddr_t)dst64 & PG_FRAME) | INTEL_PTE_REF | INTEL_PTE_MOD));
 218         src = (void *) ((uintptr_t)src_map->prv_CADDR | ((uint32_t)src64 & INTEL_OFFMASK));
 219         dst = (void *) ((uintptr_t)dst_map->prv_CADDR | ((uint32_t)dst64 & INTEL_OFFMASK));
 220 #elif defined(__x86_64__)
 221         addr64_t debug_pa = 0;
 222
 223         /* If either destination or source are outside the
 224          * physical map, establish a physical window onto the target frame.
 225          */
 226         assert(physmap_enclosed(src64) || physmap_enclosed(dst64));
 227
 228         if (physmap_enclosed(src64) == FALSE) {
 229                 src = (void *)(debugger_window_kva | (src64 & INTEL_OFFMASK));
 230                 dst = PHYSMAP_PTOV(dst64);
 231                 debug_pa = src64 & PG_FRAME;
 232         } else if (physmap_enclosed(dst64) == FALSE) {
 233                 src = PHYSMAP_PTOV(src64);
 234                 dst = (void *)(debugger_window_kva | (dst64 & INTEL_OFFMASK));
 235                 debug_pa = dst64 & PG_FRAME;
 236         } else {
 237                 src = PHYSMAP_PTOV(src64);
 238                 dst = PHYSMAP_PTOV(dst64);
 239         }
 240         /* DRK: debugger only routine, we don't bother checking for an
 241          * identical mapping.
 242          */
 243         if (debug_pa) {
 244                 if (debugger_window_kva == 0)
 245                         panic("%s: invoked in non-debug mode", __FUNCTION__);
 246                 /* Establish a cache-inhibited physical window; some platforms
 247                  * may not cover arbitrary ranges with MTRRs
 248                  */
 249                 pmap_store_pte(debugger_ptep, debug_pa | INTEL_PTE_NCACHE | INTEL_PTE_RW | INTEL_PTE_REF| INTEL_PTE_MOD | INTEL_PTE_VALID);
 250                 flush_tlb_raw();
 251 #if     DEBUG
 252                 kprintf("Remapping debugger physical window at %p to 0x%llx\n", (void *)debugger_window_kva, debug_pa);
 253 #endif
 254         }
 255 #endif
 256         /* ensure we stay within a page */
 257         if (((((uint32_t)src64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES-1)) + bytes) > I386_PGBYTES) ) {
 258                 panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
 259         }
 260
 261         /*
 262          * For device register access from the debugger,
 263          * 2-byte/16-bit, 4-byte/32-bit and 8-byte/64-bit copies are handled
 264          * by assembly routines ensuring the required access widths.
 265          * 1-byte and other copies are handled by the regular _bcopy.
 266          */
 267         switch (bytes) {
 268         case 2:
 269                 err = _bcopy2(src, dst);
 270                 break;
 271         case 4:
 272                 err = _bcopy4(src, dst);
 273                 break;
 274         case 8:
 275                 err = _bcopy8(src, dst);
 276                 break;
 277         case 1:
 278         default:
 279                 err = _bcopy(src, dst, bytes);
 280                 break;
 281         }
 282
 283 #if NCOPY_WINDOWS > 0
 284         pmap_put_mapwindow(src_map);
 285         pmap_put_mapwindow(dst_map);
 286 #endif
 287         mp_enable_preemption();
 288
 289         return err;
 290 }