1 | /* $Id: alloc-r0drv-freebsd.c 32708 2010-09-23 11:18:51Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Memory Allocation, Ring-0 Driver, FreeBSD.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
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8 | *
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9 | * Permission is hereby granted, free of charge, to any person
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10 | * obtaining a copy of this software and associated documentation
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11 | * files (the "Software"), to deal in the Software without
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12 | * restriction, including without limitation the rights to use,
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13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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14 | * copies of the Software, and to permit persons to whom the
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15 | * Software is furnished to do so, subject to the following
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16 | * conditions:
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17 | *
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18 | * The above copyright notice and this permission notice shall be
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19 | * included in all copies or substantial portions of the Software.
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20 | *
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21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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28 | * OTHER DEALINGS IN THE SOFTWARE.
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29 | */
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30 |
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31 | /*******************************************************************************
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32 | * Header Files *
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33 | *******************************************************************************/
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34 | #include "the-freebsd-kernel.h"
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35 | #include "internal/iprt.h"
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36 | #include <iprt/mem.h>
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37 |
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38 | #include <iprt/assert.h>
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39 | #include <iprt/err.h>
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40 | #include <iprt/param.h>
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41 |
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42 | #include "r0drv/alloc-r0drv.h"
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43 |
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44 |
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45 | /*******************************************************************************
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46 | * Global Variables *
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47 | *******************************************************************************/
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48 | /* These two statements will define two globals and add initializers
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49 | and destructors that will be called at load/unload time (I think). */
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50 | MALLOC_DEFINE(M_IPRTHEAP, "iprtheap", "IPRT - heap");
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51 | MALLOC_DEFINE(M_IPRTCONT, "iprtcont", "IPRT - contiguous");
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52 |
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53 |
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54 | int rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr)
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55 | {
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56 | size_t cbAllocated = cb;
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57 | PRTMEMHDR pHdr = NULL;
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58 |
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59 | #ifdef RT_ARCH_AMD64
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60 | /*
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61 | * Things are a bit more complicated on AMD64 for executable memory
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62 | * because we need to be in the ~2GB..~0 range for code.
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63 | */
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64 | if (fFlags & RTMEMHDR_FLAG_EXEC)
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65 | {
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66 | if (fFlags & RTMEMHDR_FLAG_ANY_CTX)
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67 | return VERR_NOT_SUPPORTED;
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68 |
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69 | # ifdef USE_KMEM_ALLOC_PROT
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70 | pHdr = (PRTMEMHDR)kmem_alloc_prot(kernel_map, cb + sizeof(*pHdr),
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71 | VM_PROT_ALL, VM_PROT_ALL, KERNBASE);
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72 | # else
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73 | vm_object_t pVmObject = NULL;
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74 | vm_offset_t Addr = KERNBASE;
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75 | cbAllocated = RT_ALIGN_Z(cb + sizeof(*pHdr), PAGE_SIZE);
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76 |
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77 | pVmObject = vm_object_allocate(OBJT_DEFAULT, cbAllocated >> PAGE_SHIFT);
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78 | if (!pVmObject)
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79 | return VERR_NO_EXEC_MEMORY;
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80 |
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81 | /* Addr contains a start address vm_map_find will start searching for suitable space at. */
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82 | int rc = vm_map_find(kernel_map, pVmObject, 0, &Addr,
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83 | cbAllocated, TRUE, VM_PROT_ALL, VM_PROT_ALL, 0);
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84 | if (rc == KERN_SUCCESS)
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85 | {
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86 | rc = vm_map_wire(kernel_map, Addr, Addr + cbAllocated,
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87 | VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
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88 | if (rc == KERN_SUCCESS)
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89 | {
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90 | pHdr = (PRTMEMHDR)Addr;
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91 |
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92 | if (fFlags & RTMEMHDR_FLAG_ZEROED)
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93 | bzero(pHdr, cbAllocated);
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94 | }
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95 | else
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96 | vm_map_remove(kernel_map,
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97 | Addr,
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98 | Addr + cbAllocated);
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99 | }
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100 | else
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101 | vm_object_deallocate(pVmObject);
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102 | # endif
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103 | }
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104 | else
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105 | #endif
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106 | {
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107 | pHdr = (PRTMEMHDR)malloc(cb + sizeof(RTMEMHDR), M_IPRTHEAP,
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108 | fFlags & RTMEMHDR_FLAG_ZEROED ? M_NOWAIT | M_ZERO : M_NOWAIT);
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109 | }
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110 |
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111 | if (RT_UNLIKELY(!pHdr))
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112 | return VERR_NO_MEMORY;
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113 |
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114 | pHdr->u32Magic = RTMEMHDR_MAGIC;
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115 | pHdr->fFlags = fFlags;
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116 | pHdr->cb = cbAllocated;
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117 | pHdr->cbReq = cb;
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118 |
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119 | *ppHdr = pHdr;
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120 | return VINF_SUCCESS;
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121 | }
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122 |
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123 |
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124 | void rtR0MemFree(PRTMEMHDR pHdr)
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125 | {
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126 | pHdr->u32Magic += 1;
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127 |
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128 | #ifdef RT_ARCH_AMD64
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129 | if (pHdr->fFlags & RTMEMHDR_FLAG_EXEC)
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130 | # ifdef USE_KMEM_ALLOC_PROT
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131 | kmem_free(kernel_map, (vm_offset_t)pHdr, pHdr->cb);
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132 | # else
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133 | vm_map_remove(kernel_map, (vm_offset_t)pHdr, ((vm_offset_t)pHdr) + pHdr->cb);
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134 | # endif
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135 | else
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136 | #endif
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137 | free(pHdr, M_IPRTHEAP);
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138 | }
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139 |
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140 |
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141 | RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
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142 | {
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143 | void *pv;
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144 |
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145 | /*
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146 | * Validate input.
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147 | */
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148 | AssertPtr(pPhys);
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149 | Assert(cb > 0);
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150 |
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151 | /*
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152 | * This API works in pages, so no need to do any size aligning.
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153 | */
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154 | pv = contigmalloc(cb, /* size */
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155 | M_IPRTCONT, /* type */
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156 | M_NOWAIT | M_ZERO, /* flags */
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157 | 0, /* lowest physical address*/
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158 | _4G-1, /* highest physical address */
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159 | PAGE_SIZE, /* alignment. */
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160 | 0); /* boundrary */
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161 | if (pv)
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162 | {
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163 | Assert(!((uintptr_t)pv & PAGE_OFFSET_MASK));
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164 | *pPhys = vtophys(pv);
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165 | Assert(!(*pPhys & PAGE_OFFSET_MASK));
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166 | }
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167 | return pv;
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168 | }
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169 |
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170 |
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171 | RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
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172 | {
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173 | if (pv)
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174 | {
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175 | AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
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176 | contigfree(pv, cb, M_IPRTCONT);
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177 | }
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178 | }
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179 |
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