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 [email protected]
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_ldebug.h>
58
59 #include <sys/kdebug.h>
60
61 #include <mach/kern_return.h>
62 #include <mach/thread_status.h>
63 #include <mach/vm_param.h>
64
65 #include <kern/mach_param.h>
66 #include <kern/task.h>
67 #include <kern/thread.h>
68 #include <kern/sched_prim.h>
69 #include <kern/misc_protos.h>
70 #include <kern/assert.h>
71 #include <kern/spl.h>
72 #include <ipc/ipc_port.h>
73 #include <vm/vm_kern.h>
74 #include <vm/vm_map.h>
75 #include <vm/pmap.h>
76
77 #include <i386/cpu_data.h>
78 #include <i386/cpu_number.h>
79 #include <i386/thread.h>
80 #include <i386/eflags.h>
81 #include <i386/proc_reg.h>
82 #include <i386/seg.h>
83 #include <i386/tss.h>
84 #include <i386/user_ldt.h>
85 #include <i386/fpu.h>
86 #include <i386/misc_protos.h>
87
88 /*
89 * pmap_zero_page zeros the specified (machine independent) page.
90 */
91 void
pmap_zero_page(ppnum_t pn)92 pmap_zero_page(
93 ppnum_t pn)
94 {
95 assert(pn != vm_page_fictitious_addr);
96 assert(pn != vm_page_guard_addr);
97 bzero_phys((addr64_t)i386_ptob(pn), PAGE_SIZE);
98 }
99
100 /*
101 * pmap_zero_part_page
102 * zeros the specified (machine independent) part of a page.
103 */
104 void
pmap_zero_part_page(ppnum_t pn,vm_offset_t offset,vm_size_t len)105 pmap_zero_part_page(
106 ppnum_t pn,
107 vm_offset_t offset,
108 vm_size_t len)
109 {
110 assert(pn != vm_page_fictitious_addr);
111 assert(pn != vm_page_guard_addr);
112 assert(offset + len <= PAGE_SIZE);
113 bzero_phys((addr64_t)(i386_ptob(pn) + offset), (uint32_t)len);
114 }
115
116 /*
117 * pmap_copy_page copies the specified (machine independent) pages.
118 */
119 void
pmap_copy_part_page(ppnum_t psrc,vm_offset_t src_offset,ppnum_t pdst,vm_offset_t dst_offset,vm_size_t len)120 pmap_copy_part_page(
121 ppnum_t psrc,
122 vm_offset_t src_offset,
123 ppnum_t pdst,
124 vm_offset_t dst_offset,
125 vm_size_t len)
126 {
127 pmap_paddr_t src, dst;
128
129 assert(psrc != vm_page_fictitious_addr);
130 assert(pdst != vm_page_fictitious_addr);
131 assert(psrc != vm_page_guard_addr);
132 assert(pdst != vm_page_guard_addr);
133
134 src = i386_ptob(psrc);
135 dst = i386_ptob(pdst);
136
137 assert((((uintptr_t)dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
138 assert((((uintptr_t)src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
139
140 bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
141 (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
142 len);
143 }
144
145 /*
146 * pmap_copy_part_lpage copies part of a virtually addressed page
147 * to a physically addressed page.
148 */
149 void
pmap_copy_part_lpage(__unused vm_offset_t src,__unused ppnum_t pdst,__unused vm_offset_t dst_offset,__unused vm_size_t len)150 pmap_copy_part_lpage(
151 __unused vm_offset_t src,
152 __unused ppnum_t pdst,
153 __unused vm_offset_t dst_offset,
154 __unused vm_size_t len)
155 {
156 assert(pdst != vm_page_fictitious_addr);
157 assert(pdst != vm_page_guard_addr);
158 assert((dst_offset + len) <= PAGE_SIZE);
159 }
160
161 /*
162 * pmap_copy_part_rpage copies part of a physically addressed page
163 * to a virtually addressed page.
164 */
165 void
pmap_copy_part_rpage(__unused ppnum_t psrc,__unused vm_offset_t src_offset,__unused vm_offset_t dst,__unused vm_size_t len)166 pmap_copy_part_rpage(
167 __unused ppnum_t psrc,
168 __unused vm_offset_t src_offset,
169 __unused vm_offset_t dst,
170 __unused vm_size_t len)
171 {
172 assert(psrc != vm_page_fictitious_addr);
173 assert(psrc != vm_page_guard_addr);
174 assert((src_offset + len) <= PAGE_SIZE);
175 }
176
177 /*
178 * kvtophys(addr)
179 *
180 * Convert a kernel virtual address to a physical address
181 */
182 addr64_t
kvtophys(vm_offset_t addr)183 kvtophys(
184 vm_offset_t addr)
185 {
186 pmap_paddr_t pa;
187
188 pa = ((pmap_paddr_t)pmap_find_phys(kernel_pmap, addr)) << INTEL_PGSHIFT;
189 if (pa) {
190 pa |= (addr & INTEL_OFFMASK);
191 }
192
193 return (addr64_t)pa;
194 }
195
196 extern pt_entry_t *debugger_ptep;
197 extern vm_offset_t debugger_window_kva;
198 extern int _bcopy(const void *, void *, vm_size_t);
199 extern int _bcopy2(const void *, void *);
200 extern int _bcopy4(const void *, void *);
201 extern int _bcopy8(const void *, void *);
202
203 __private_extern__ int
ml_copy_phys(addr64_t src64,addr64_t dst64,vm_size_t bytes)204 ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes)
205 {
206 void *src, *dst;
207 int err = 0;
208
209 mp_disable_preemption();
210 addr64_t debug_pa = 0;
211
212 /* If either destination or source are outside the
213 * physical map, establish a physical window onto the target frame.
214 */
215 assert(physmap_enclosed(src64) || physmap_enclosed(dst64));
216
217 if (physmap_enclosed(src64) == FALSE) {
218 src = (void *)(debugger_window_kva | (src64 & INTEL_OFFMASK));
219 dst = PHYSMAP_PTOV(dst64);
220 debug_pa = src64 & PG_FRAME;
221 } else if (physmap_enclosed(dst64) == FALSE) {
222 src = PHYSMAP_PTOV(src64);
223 dst = (void *)(debugger_window_kva | (dst64 & INTEL_OFFMASK));
224 debug_pa = dst64 & PG_FRAME;
225 } else {
226 src = PHYSMAP_PTOV(src64);
227 dst = PHYSMAP_PTOV(dst64);
228 }
229 /* DRK: debugger only routine, we don't bother checking for an
230 * identical mapping.
231 */
232 if (debug_pa) {
233 if (debugger_window_kva == 0) {
234 panic("%s: invoked in non-debug mode", __FUNCTION__);
235 }
236 /* Establish a cache-inhibited physical window; some platforms
237 * may not cover arbitrary ranges with MTRRs
238 */
239 pmap_store_pte(FALSE, debugger_ptep, debug_pa | INTEL_PTE_NCACHE | INTEL_PTE_RW | INTEL_PTE_REF | INTEL_PTE_MOD | INTEL_PTE_VALID);
240 pmap_tlbi_range(0, ~0ULL, true, 0);
241 #if DEBUG
242 kprintf("Remapping debugger physical window at %p to 0x%llx\n", (void *)debugger_window_kva, debug_pa);
243 #endif
244 }
245 /* ensure we stay within a page */
246 if (((((uint32_t)src64 & (I386_PGBYTES - 1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES - 1)) + bytes) > I386_PGBYTES)) {
247 panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
248 }
249
250 /*
251 * For device register access from the debugger,
252 * 2-byte/16-bit, 4-byte/32-bit and 8-byte/64-bit copies are handled
253 * by assembly routines ensuring the required access widths.
254 * 1-byte and other copies are handled by the regular _bcopy.
255 */
256 switch (bytes) {
257 case 2:
258 err = _bcopy2(src, dst);
259 break;
260 case 4:
261 err = _bcopy4(src, dst);
262 break;
263 case 8:
264 err = _bcopy8(src, dst);
265 break;
266 case 1:
267 default:
268 err = _bcopy(src, dst, bytes);
269 break;
270 }
271
272 mp_enable_preemption();
273
274 return err;
275 }
276