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         assert(pdst != vm_page_fictitious_addr);
 159         assert(pdst != vm_page_guard_addr);
 160         assert((dst_offset + len) <= PAGE_SIZE);
 161 }
 162
 163 /*
 164  *      pmap_copy_part_rpage copies part of a physically addressed page
 165  *      to a virtually addressed page.
 166  */
 167 void
 168 pmap_copy_part_rpage(
 169         __unused ppnum_t                psrc,
 170         __unused vm_offset_t    src_offset,
 171         __unused vm_offset_t    dst,
 172         __unused vm_size_t      len)
 173 {
 174         assert(psrc != vm_page_fictitious_addr);
 175         assert(psrc != vm_page_guard_addr);
 176         assert((src_offset + len) <= PAGE_SIZE);
 177 }
 178
 179 /*
 180  *      kvtophys(addr)
 181  *
 182  *      Convert a kernel virtual address to a physical address
 183  */
 184 addr64_t
 185 kvtophys(
 186         vm_offset_t addr)
 187 {
 188         pmap_paddr_t pa;
 189
 190         pa = ((pmap_paddr_t)pmap_find_phys(kernel_pmap, addr)) << INTEL_PGSHIFT;
 191         if (pa) {
 192                 pa |= (addr & INTEL_OFFMASK);
 193         }
 194
 195         return (addr64_t)pa;
 196 }
 197
 198 extern pt_entry_t *debugger_ptep;
 199 extern vm_map_offset_t debugger_window_kva;
 200 extern int _bcopy(const void *, void *, vm_size_t);
 201 extern int _bcopy2(const void *, void *);
 202 extern int _bcopy4(const void *, void *);
 203 extern int _bcopy8(const void *, void *);
 204
 205 __private_extern__ int
 206 ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes)
 207 {
 208         void *src, *dst;
 209         int err = 0;
 210
 211         mp_disable_preemption();
 212         addr64_t debug_pa = 0;
 213
 214         /* If either destination or source are outside the
 215          * physical map, establish a physical window onto the target frame.
 216          */
 217         assert(physmap_enclosed(src64) || physmap_enclosed(dst64));
 218
 219         if (physmap_enclosed(src64) == FALSE) {
 220                 src = (void *)(debugger_window_kva | (src64 & INTEL_OFFMASK));
 221                 dst = PHYSMAP_PTOV(dst64);
 222                 debug_pa = src64 & PG_FRAME;
 223         } else if (physmap_enclosed(dst64) == FALSE) {
 224                 src = PHYSMAP_PTOV(src64);
 225                 dst = (void *)(debugger_window_kva | (dst64 & INTEL_OFFMASK));
 226                 debug_pa = dst64 & PG_FRAME;
 227         } else {
 228                 src = PHYSMAP_PTOV(src64);
 229                 dst = PHYSMAP_PTOV(dst64);
 230         }
 231         /* DRK: debugger only routine, we don't bother checking for an
 232          * identical mapping.
 233          */
 234         if (debug_pa) {
 235                 if (debugger_window_kva == 0) {
 236                         panic("%s: invoked in non-debug mode", __FUNCTION__);
 237                 }
 238                 /* Establish a cache-inhibited physical window; some platforms
 239                  * may not cover arbitrary ranges with MTRRs
 240                  */
 241                 pmap_store_pte(debugger_ptep, debug_pa | INTEL_PTE_NCACHE | INTEL_PTE_RW | INTEL_PTE_REF | INTEL_PTE_MOD | INTEL_PTE_VALID);
 242                 pmap_tlbi_range(0, ~0ULL, true, 0);
 243 #if     DEBUG
 244                 kprintf("Remapping debugger physical window at %p to 0x%llx\n", (void *)debugger_window_kva, debug_pa);
 245 #endif
 246         }
 247         /* ensure we stay within a page */
 248         if (((((uint32_t)src64 & (I386_PGBYTES - 1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES - 1)) + bytes) > I386_PGBYTES)) {
 249                 panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
 250         }
 251
 252         /*
 253          * For device register access from the debugger,
 254          * 2-byte/16-bit, 4-byte/32-bit and 8-byte/64-bit copies are handled
 255          * by assembly routines ensuring the required access widths.
 256          * 1-byte and other copies are handled by the regular _bcopy.
 257          */
 258         switch (bytes) {
 259         case 2:
 260                 err = _bcopy2(src, dst);
 261                 break;
 262         case 4:
 263                 err = _bcopy4(src, dst);
 264                 break;
 265         case 8:
 266                 err = _bcopy8(src, dst);
 267                 break;
 268         case 1:
 269         default:
 270                 err = _bcopy(src, dst, bytes);
 271                 break;
 272         }
 273
 274         mp_enable_preemption();
 275
 276         return err;
 277 }