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_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/mach_param.h>
67 #include <kern/task.h>
68 #include <kern/thread.h>
69 #include <kern/sched_prim.h>
70 #include <kern/misc_protos.h>
71 #include <kern/assert.h>
72 #include <kern/spl.h>
73 #include <ipc/ipc_port.h>
74 #include <vm/vm_kern.h>
75 #include <vm/vm_map.h>
76 #include <vm/pmap.h>
77
78 #include <i386/cpu_data.h>
79 #include <i386/cpu_number.h>
80 #include <i386/thread.h>
81 #include <i386/eflags.h>
82 #include <i386/proc_reg.h>
83 #include <i386/seg.h>
84 #include <i386/tss.h>
85 #include <i386/user_ldt.h>
86 #include <i386/fpu.h>
87 #include <i386/misc_protos.h>
88
89 /*
90 * pmap_zero_page zeros the specified (machine independent) page.
91 */
92 void
pmap_zero_page(ppnum_t pn)93 pmap_zero_page(
94 ppnum_t pn)
95 {
96 assert(pn != vm_page_fictitious_addr);
97 assert(pn != vm_page_guard_addr);
98 bzero_phys((addr64_t)i386_ptob(pn), PAGE_SIZE);
99 }
100
101 /*
102 * pmap_zero_part_page
103 * zeros the specified (machine independent) part of a page.
104 */
105 void
pmap_zero_part_page(ppnum_t pn,vm_offset_t offset,vm_size_t len)106 pmap_zero_part_page(
107 ppnum_t pn,
108 vm_offset_t offset,
109 vm_size_t len)
110 {
111 assert(pn != vm_page_fictitious_addr);
112 assert(pn != vm_page_guard_addr);
113 assert(offset + len <= PAGE_SIZE);
114 bzero_phys((addr64_t)(i386_ptob(pn) + offset), (uint32_t)len);
115 }
116
117 /*
118 * pmap_copy_page copies the specified (machine independent) pages.
119 */
120 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)121 pmap_copy_part_page(
122 ppnum_t psrc,
123 vm_offset_t src_offset,
124 ppnum_t pdst,
125 vm_offset_t dst_offset,
126 vm_size_t len)
127 {
128 pmap_paddr_t src, dst;
129
130 assert(psrc != vm_page_fictitious_addr);
131 assert(pdst != vm_page_fictitious_addr);
132 assert(psrc != vm_page_guard_addr);
133 assert(pdst != vm_page_guard_addr);
134
135 src = i386_ptob(psrc);
136 dst = i386_ptob(pdst);
137
138 assert((((uintptr_t)dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
139 assert((((uintptr_t)src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
140
141 bcopy_phys((addr64_t)src + (src_offset & INTEL_OFFMASK),
142 (addr64_t)dst + (dst_offset & INTEL_OFFMASK),
143 len);
144 }
145
146 /*
147 * pmap_copy_part_lpage copies part of a virtually addressed page
148 * to a physically addressed page.
149 */
150 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)151 pmap_copy_part_lpage(
152 __unused vm_offset_t src,
153 __unused ppnum_t pdst,
154 __unused vm_offset_t dst_offset,
155 __unused vm_size_t len)
156 {
157 assert(pdst != vm_page_fictitious_addr);
158 assert(pdst != vm_page_guard_addr);
159 assert((dst_offset + len) <= PAGE_SIZE);
160 }
161
162 /*
163 * pmap_copy_part_rpage copies part of a physically addressed page
164 * to a virtually addressed page.
165 */
166 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)167 pmap_copy_part_rpage(
168 __unused ppnum_t psrc,
169 __unused vm_offset_t src_offset,
170 __unused vm_offset_t dst,
171 __unused vm_size_t len)
172 {
173 assert(psrc != vm_page_fictitious_addr);
174 assert(psrc != vm_page_guard_addr);
175 assert((src_offset + len) <= PAGE_SIZE);
176 }
177
178 /*
179 * kvtophys(addr)
180 *
181 * Convert a kernel virtual address to a physical address
182 */
183 addr64_t
kvtophys(vm_offset_t addr)184 kvtophys(
185 vm_offset_t addr)
186 {
187 pmap_paddr_t pa;
188
189 pa = ((pmap_paddr_t)pmap_find_phys(kernel_pmap, addr)) << INTEL_PGSHIFT;
190 if (pa) {
191 pa |= (addr & INTEL_OFFMASK);
192 }
193
194 return (addr64_t)pa;
195 }
196
197 extern pt_entry_t *debugger_ptep;
198 extern vm_offset_t debugger_window_kva;
199 extern int _bcopy(const void *, void *, vm_size_t);
200 extern int _bcopy2(const void *, void *);
201 extern int _bcopy4(const void *, void *);
202 extern int _bcopy8(const void *, void *);
203
204 __private_extern__ int
ml_copy_phys(addr64_t src64,addr64_t dst64,vm_size_t bytes)205 ml_copy_phys(addr64_t src64, addr64_t dst64, vm_size_t bytes)
206 {
207 void *src, *dst;
208 int err = 0;
209
210 mp_disable_preemption();
211 addr64_t debug_pa = 0;
212
213 /* If either destination or source are outside the
214 * physical map, establish a physical window onto the target frame.
215 */
216 assert(physmap_enclosed(src64) || physmap_enclosed(dst64));
217
218 if (physmap_enclosed(src64) == FALSE) {
219 src = (void *)(debugger_window_kva | (src64 & INTEL_OFFMASK));
220 dst = PHYSMAP_PTOV(dst64);
221 debug_pa = src64 & PG_FRAME;
222 } else if (physmap_enclosed(dst64) == FALSE) {
223 src = PHYSMAP_PTOV(src64);
224 dst = (void *)(debugger_window_kva | (dst64 & INTEL_OFFMASK));
225 debug_pa = dst64 & PG_FRAME;
226 } else {
227 src = PHYSMAP_PTOV(src64);
228 dst = PHYSMAP_PTOV(dst64);
229 }
230 /* DRK: debugger only routine, we don't bother checking for an
231 * identical mapping.
232 */
233 if (debug_pa) {
234 if (debugger_window_kva == 0) {
235 panic("%s: invoked in non-debug mode", __FUNCTION__);
236 }
237 /* Establish a cache-inhibited physical window; some platforms
238 * may not cover arbitrary ranges with MTRRs
239 */
240 pmap_store_pte(FALSE, debugger_ptep, debug_pa | INTEL_PTE_NCACHE | INTEL_PTE_RW | INTEL_PTE_REF | INTEL_PTE_MOD | INTEL_PTE_VALID);
241 pmap_tlbi_range(0, ~0ULL, true, 0);
242 #if DEBUG
243 kprintf("Remapping debugger physical window at %p to 0x%llx\n", (void *)debugger_window_kva, debug_pa);
244 #endif
245 }
246 /* ensure we stay within a page */
247 if (((((uint32_t)src64 & (I386_PGBYTES - 1)) + bytes) > I386_PGBYTES) || ((((uint32_t)dst64 & (I386_PGBYTES - 1)) + bytes) > I386_PGBYTES)) {
248 panic("ml_copy_phys spans pages, src: 0x%llx, dst: 0x%llx", src64, dst64);
249 }
250
251 /*
252 * For device register access from the debugger,
253 * 2-byte/16-bit, 4-byte/32-bit and 8-byte/64-bit copies are handled
254 * by assembly routines ensuring the required access widths.
255 * 1-byte and other copies are handled by the regular _bcopy.
256 */
257 switch (bytes) {
258 case 2:
259 err = _bcopy2(src, dst);
260 break;
261 case 4:
262 err = _bcopy4(src, dst);
263 break;
264 case 8:
265 err = _bcopy8(src, dst);
266 break;
267 case 1:
268 default:
269 err = _bcopy(src, dst, bytes);
270 break;
271 }
272
273 mp_enable_preemption();
274
275 return err;
276 }
277