| 211 | } |
| 212 | |
| 213 | U32 KMemory::mremap(KThread* thread, U32 oldaddress, U32 oldsize, U32 newsize, U32 flags) { |
| 214 | if (flags > 1) { |
| 215 | kpanic_fmt("mremap not implemented: flags=%X", flags); |
| 216 | } |
| 217 | // is page aligned |
| 218 | if (oldaddress & 0xFFF) { |
| 219 | return -K_EINVAL; |
| 220 | } |
| 221 | if (newsize == 0) { |
| 222 | return -K_EINVAL; |
| 223 | } |
| 224 | if (oldsize == 0) { |
| 225 | kpanic("mremap not implemented for oldsize==0"); |
| 226 | } |
| 227 | U32 oldPageCount = oldsize >> K_PAGE_SHIFT; |
| 228 | U32 oldPageStart = oldaddress >> K_PAGE_SHIFT; |
| 229 | U32 pageFlags = getPageFlags(oldPageStart); |
| 230 | |
| 231 | for (U32 i = 0; i < oldPageCount; i++) { |
| 232 | if (getPageFlags(oldPageStart + i) != pageFlags) { |
| 233 | return -K_EFAULT; |
| 234 | } |
| 235 | } |
| 236 | if (newsize < oldsize) { |
| 237 | this->unmap(oldaddress + newsize, oldsize - newsize); |
| 238 | return oldaddress; |
| 239 | } else { |
| 240 | U32 prot = 0; |
| 241 | U32 f = 0; |
| 242 | if (pageFlags & PAGE_READ) { |
| 243 | prot |= K_PROT_READ; |
| 244 | } |
| 245 | if (pageFlags & PAGE_WRITE) { |
| 246 | prot |= K_PROT_WRITE; |
| 247 | } |
| 248 | if (pageFlags & PAGE_EXEC) { |
| 249 | prot |= K_PROT_EXEC; |
| 250 | } |
| 251 | if (pageFlags & PAGE_SHARED) { |
| 252 | f |= K_MAP_SHARED; |
| 253 | } else { |
| 254 | f |= K_MAP_PRIVATE; |
| 255 | } |
| 256 | U32 result = this->mmap(thread, oldaddress + oldsize, newsize - oldsize, prot, f | K_MAP_FIXED_NOREPLACE, -1, 0, true); |
| 257 | if (result == oldaddress + oldsize) { |
| 258 | return oldaddress; |
| 259 | } |
| 260 | if ((flags & 1) != 0) { // MREMAP_MAYMOVE |
| 261 | result = this->mmap(thread, 0, newsize, prot, f | K_MAP_ANONYMOUS, -1, 0); |
| 262 | this->memcpy(result, oldaddress, oldsize); |
| 263 | this->unmap(oldaddress, oldsize); |
| 264 | return result; |
| 265 | } |
| 266 | return -K_ENOMEM; |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | U32 KMemory::unmap(U32 address, U32 len) { |
no test coverage detected