1/*
2 * Copyright 2008-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
3 * Copyright 2002-2007, Axel D��rfler, axeld@pinc-software.de. All rights reserved.
4 * Distributed under the terms of the MIT License.
5 *
6 * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
7 * Distributed under the terms of the NewOS License.
8 */
9
10
11#include <arch/vm_translation_map.h>
12
13#include <boot/kernel_args.h>
14#include <safemode.h>
15
16#ifdef __x86_64__
17#	include "paging/64bit/X86PagingMethod64Bit.h"
18#else
19#	include "paging/32bit/X86PagingMethod32Bit.h"
20#	include "paging/pae/X86PagingMethodPAE.h"
21#endif
22
23
24//#define TRACE_VM_TMAP
25#ifdef TRACE_VM_TMAP
26#	define TRACE(x...) dprintf(x)
27#else
28#	define TRACE(x...) ;
29#endif
30
31
32static union {
33	uint64	align;
34#ifdef __x86_64__
35	char	sixty_four[sizeof(X86PagingMethod64Bit)];
36#else
37	char	thirty_two[sizeof(X86PagingMethod32Bit)];
38#if B_HAIKU_PHYSICAL_BITS == 64
39	char	pae[sizeof(X86PagingMethodPAE)];
40#endif
41#endif
42} sPagingMethodBuffer;
43
44
45// #pragma mark - VM API
46
47
48status_t
49arch_vm_translation_map_create_map(bool kernel, VMTranslationMap** _map)
50{
51	return gX86PagingMethod->CreateTranslationMap(kernel, _map);
52}
53
54
55status_t
56arch_vm_translation_map_init(kernel_args *args,
57	VMPhysicalPageMapper** _physicalPageMapper)
58{
59	TRACE("vm_translation_map_init: entry\n");
60
61#ifdef TRACE_VM_TMAP
62	TRACE("physical memory ranges:\n");
63	for (uint32 i = 0; i < args->num_physical_memory_ranges; i++) {
64		phys_addr_t start = args->physical_memory_range[i].start;
65		phys_addr_t end = start + args->physical_memory_range[i].size;
66		TRACE("  %#10" B_PRIxPHYSADDR " - %#10" B_PRIxPHYSADDR "\n", start,
67			end);
68	}
69
70	TRACE("allocated physical ranges:\n");
71	for (uint32 i = 0; i < args->num_physical_allocated_ranges; i++) {
72		phys_addr_t start = args->physical_allocated_range[i].start;
73		phys_addr_t end = start + args->physical_allocated_range[i].size;
74		TRACE("  %#10" B_PRIxPHYSADDR " - %#10" B_PRIxPHYSADDR "\n", start,
75			end);
76	}
77
78	TRACE("allocated virtual ranges:\n");
79	for (uint32 i = 0; i < args->num_virtual_allocated_ranges; i++) {
80		addr_t start = args->virtual_allocated_range[i].start;
81		addr_t end = start + args->virtual_allocated_range[i].size;
82		TRACE("  %#10" B_PRIxADDR " - %#10" B_PRIxADDR "\n", start, end);
83	}
84#endif
85
86#ifdef __x86_64__
87	bool la57Available = x86_check_feature(IA32_FEATURE_LA57, FEATURE_7_ECX);
88	bool enabled = la57Available && (x86_read_cr4() & IA32_CR4_LA57) != 0;
89	if (enabled)
90		dprintf("using LA57 paging\n");
91	gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod64Bit(enabled);
92#elif B_HAIKU_PHYSICAL_BITS == 64
93	bool paeAvailable = x86_check_feature(IA32_FEATURE_PAE, FEATURE_COMMON);
94	bool paeNeeded = x86_check_feature(IA32_FEATURE_AMD_EXT_NX,
95		FEATURE_EXT_AMD);
96	if (!paeNeeded) {
97		for (uint32 i = 0; i < args->num_physical_memory_ranges; i++) {
98			phys_addr_t end = args->physical_memory_range[i].start
99				+ args->physical_memory_range[i].size;
100			if (end > 0x100000000LL) {
101				paeNeeded = true;
102				break;
103			}
104		}
105	}
106
107	bool paeDisabled = get_safemode_boolean_early(args,
108		B_SAFEMODE_4_GB_MEMORY_LIMIT, false);
109
110	if (paeAvailable && paeNeeded && !paeDisabled) {
111		dprintf("using PAE paging\n");
112		gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethodPAE;
113	} else {
114		dprintf("using 32 bit paging (PAE %s)\n",
115			paeNeeded
116				? "not available"
117				: (paeDisabled ? "disabled" : "not needed"));
118		gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit;
119	}
120#else
121	gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit;
122#endif
123
124	return gX86PagingMethod->Init(args, _physicalPageMapper);
125}
126
127
128status_t
129arch_vm_translation_map_init_post_sem(kernel_args *args)
130{
131	return B_OK;
132}
133
134
135status_t
136arch_vm_translation_map_init_post_area(kernel_args *args)
137{
138	TRACE("vm_translation_map_init_post_area: entry\n");
139
140	return gX86PagingMethod->InitPostArea(args);
141}
142
143
144status_t
145arch_vm_translation_map_early_map(kernel_args *args, addr_t va, phys_addr_t pa,
146	uint8 attributes, phys_addr_t (*get_free_page)(kernel_args *))
147{
148	TRACE("early_tmap: entry pa %#" B_PRIxPHYSADDR " va %#" B_PRIxADDR "\n", pa,
149		va);
150
151	return gX86PagingMethod->MapEarly(args, va, pa, attributes, get_free_page);
152}
153
154
155/*!	Verifies that the page at the given virtual address can be accessed in the
156	current context.
157
158	This function is invoked in the kernel debugger. Paranoid checking is in
159	order.
160
161	\param virtualAddress The virtual address to be checked.
162	\param protection The area protection for which to check. Valid is a bitwise
163		or of one or more of \c B_KERNEL_READ_AREA or \c B_KERNEL_WRITE_AREA.
164	\return \c true, if the address can be accessed in all ways specified by
165		\a protection, \c false otherwise.
166*/
167bool
168arch_vm_translation_map_is_kernel_page_accessible(addr_t virtualAddress,
169	uint32 protection)
170{
171	if (!gX86PagingMethod)
172		return true;
173
174	return gX86PagingMethod->IsKernelPageAccessible(virtualAddress, protection);
175}
176