21 * questions. 22 */ 23 24 #include "precompiled.hpp" 25 #include "gc/z/zAddress.inline.hpp" 26 #include "gc/z/zVirtualMemory.hpp" 27 #include "logging/log.hpp" 28 29 #include <sys/mman.h> 30 #include <sys/types.h> 31 32 void ZVirtualMemoryManager::initialize_os() { 33 // Does nothing 34 } 35 36 static void unmap(uintptr_t start, size_t size) { 37 const int res = munmap((void*)start, size); 38 assert(res == 0, "Failed to unmap memory"); 39 } 40 41 static bool map(uintptr_t start, size_t size) { 42 const void* const res = mmap((void*)start, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0); 43 if (res == MAP_FAILED) { 44 // Failed to reserve memory 45 return false; 46 } 47 48 if ((uintptr_t)res != start) { 49 // Failed to reserve memory at the requested address 50 unmap((uintptr_t)res, size); 51 return false; 52 } 53 54 // Success 55 return true; 56 } 57 58 bool ZVirtualMemoryManager::reserve_contiguous_platform(uintptr_t start, size_t size) { 59 // Reserve address views 60 const uintptr_t marked0 = ZAddress::marked0(start); 61 const uintptr_t marked1 = ZAddress::marked1(start); 62 const uintptr_t remapped = ZAddress::remapped(start); 63 64 if (!map(marked0, size)) { 65 return false; 66 } 67 68 if (!map(marked1, size)) { 69 unmap(marked0, size); 70 return false; 71 } 72 73 if (!map(remapped, size)) { 74 unmap(marked0, size); 75 unmap(marked1, size); 76 return false; 77 } 78 79 // Register address views with native memory tracker 80 nmt_reserve(marked0, size); 81 nmt_reserve(marked1, size); 82 nmt_reserve(remapped, size); 83 84 return true; 85 } | 21 * questions. 22 */ 23 24 #include "precompiled.hpp" 25 #include "gc/z/zAddress.inline.hpp" 26 #include "gc/z/zVirtualMemory.hpp" 27 #include "logging/log.hpp" 28 29 #include <sys/mman.h> 30 #include <sys/types.h> 31 32 void ZVirtualMemoryManager::initialize_os() { 33 // Does nothing 34 } 35 36 static void unmap(uintptr_t start, size_t size) { 37 const int res = munmap((void*)start, size); 38 assert(res == 0, "Failed to unmap memory"); 39 } 40 41 static uintptr_t map(uintptr_t start, size_t size, uintptr_t *mmap_result) { 42 const void* const res = mmap((void*)start, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0); 43 *mmap_result = (uintptr_t) res; 44 if (res == MAP_FAILED) { 45 // Failed to reserve memory 46 return false; 47 } 48 49 if ((uintptr_t)res != start) { 50 // Failed to reserve memory at the requested address 51 unmap((uintptr_t)res, size); 52 return false; 53 } 54 55 // Success 56 return true; 57 } 58 59 bool ZVirtualMemoryManager::reserve_contiguous_platform(uintptr_t start, size_t size) { 60 // Reserve address views 61 const uintptr_t marked0 = ZAddress::marked0(start); 62 const uintptr_t marked1 = ZAddress::marked1(start); 63 const uintptr_t remapped = ZAddress::remapped(start); 64 65 uintptr_t mmap_result; 66 67 if (!map(marked0, size, &mmap_result)) { 68 size_t address_bits = sizeof(size_t) * CHAR_BIT - (size_t)__builtin_clzll((unsigned long long)mmap_result); 69 if (address_bits > _address_bits_seen) { 70 _address_bits_seen = address_bits; 71 } 72 return false; 73 } 74 75 if (!map(marked1, size, &mmap_result)) { 76 size_t address_bits = sizeof(size_t) * CHAR_BIT - (size_t)__builtin_clzll((unsigned long long)mmap_result); 77 if (address_bits > _address_bits_seen) { 78 _address_bits_seen = address_bits; 79 } 80 unmap(marked0, size); 81 return false; 82 } 83 84 if (!map(remapped, size, &mmap_result)) { 85 size_t address_bits = sizeof(size_t) * CHAR_BIT - (size_t)__builtin_clzll((unsigned long long)mmap_result); 86 if (address_bits > _address_bits_seen) { 87 _address_bits_seen = address_bits; 88 } 89 unmap(marked0, size); 90 unmap(marked1, size); 91 return false; 92 } 93 94 // Register address views with native memory tracker 95 nmt_reserve(marked0, size); 96 nmt_reserve(marked1, size); 97 nmt_reserve(remapped, size); 98 99 return true; 100 } |