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authorMarkus Wick <markus@selfnet.de>2021-06-05 10:07:26 +0200
committerMarkus Wick <markus@selfnet.de>2021-06-11 17:27:06 +0200
commit5105318bbc6843de14f3f949515007d9bf76aa7b (patch)
tree271c02fcc896232da5051b13e5a88ee2d487146f /src/common/host_memory.cpp
parentcommon/host_memory: Add interface and Windows implementation (diff)
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Diffstat (limited to 'src/common/host_memory.cpp')
-rw-r--r--src/common/host_memory.cpp130
1 files changed, 120 insertions, 10 deletions
diff --git a/src/common/host_memory.cpp b/src/common/host_memory.cpp
index 4f5086e90..eb50fbd9f 100644
--- a/src/common/host_memory.cpp
+++ b/src/common/host_memory.cpp
@@ -1,11 +1,5 @@
-#ifdef __linux__
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <unistd.h>
-#elif defined(_WIN32) // ^^^ Linux ^^^ vvv Windows vvv
+#ifdef _WIN32
+
#ifdef _WIN32_WINNT
#undef _WIN32_WINNT
#endif
@@ -20,13 +14,23 @@
#pragma comment(lib, "mincore.lib")
-#endif // ^^^ Windows ^^^
+#elif defined(__linux__) // ^^^ Windows ^^^ vvv Linux vvv
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#endif // ^^^ Linux ^^^
#include <mutex>
#include "common/assert.h"
#include "common/host_memory.h"
#include "common/logging/log.h"
+#include "common/scope_exit.h"
namespace Common {
@@ -269,7 +273,113 @@ private:
std::unordered_map<size_t, size_t> placeholder_host_pointers; ///< Placeholder backing offset
};
-#else
+#elif defined(__linux__) // ^^^ Windows ^^^ vvv Linux vvv
+
+class HostMemory::Impl {
+public:
+ explicit Impl(size_t backing_size_, size_t virtual_size_)
+ : backing_size{backing_size_}, virtual_size{virtual_size_} {
+ bool good = false;
+ SCOPE_EXIT({
+ if (!good) {
+ Release();
+ }
+ });
+
+ // Backing memory initialization
+ fd = memfd_create("HostMemory", 0);
+ if (fd == -1) {
+ LOG_CRITICAL(HW_Memory, "memfd_create failed: {}", strerror(errno));
+ throw std::bad_alloc{};
+ }
+
+ // Defined to extend the file with zeros
+ int ret = ftruncate(fd, backing_size);
+ if (ret != 0) {
+ LOG_CRITICAL(HW_Memory, "ftruncate failed with {}, are you out-of-memory?",
+ strerror(errno));
+ throw std::bad_alloc{};
+ }
+
+ backing_base = static_cast<u8*>(
+ mmap(nullptr, backing_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
+ if (backing_base == MAP_FAILED) {
+ LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
+ throw std::bad_alloc{};
+ }
+
+ // Virtual memory initialization
+ virtual_base = static_cast<u8*>(
+ mmap(nullptr, virtual_size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
+ if (virtual_base == MAP_FAILED) {
+ LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
+ throw std::bad_alloc{};
+ }
+
+ good = true;
+ }
+
+ ~Impl() {
+ Release();
+ }
+
+ void Map(size_t virtual_offset, size_t host_offset, size_t length) {
+
+ void* ret = mmap(virtual_base + virtual_offset, length, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_FIXED, fd, host_offset);
+ ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
+ }
+
+ void Unmap(size_t virtual_offset, size_t length) {
+ // The method name is wrong. We're still talking about the virtual range.
+ // We don't want to unmap, we want to reserve this memory.
+
+ void* ret = mmap(virtual_base + virtual_offset, length, PROT_NONE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
+ ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
+ }
+
+ void Protect(size_t virtual_offset, size_t length, bool read, bool write) {
+ int flags = 0;
+ if (read) {
+ flags |= PROT_READ;
+ }
+ if (write) {
+ flags |= PROT_WRITE;
+ }
+ int ret = mprotect(virtual_base + virtual_offset, length, flags);
+ ASSERT_MSG(ret == 0, "mprotect failed: {}", strerror(errno));
+ }
+
+ const size_t backing_size; ///< Size of the backing memory in bytes
+ const size_t virtual_size; ///< Size of the virtual address placeholder in bytes
+
+ u8* backing_base{reinterpret_cast<u8*>(MAP_FAILED)};
+ u8* virtual_base{reinterpret_cast<u8*>(MAP_FAILED)};
+
+private:
+ /// Release all resources in the object
+ void Release() {
+ if (virtual_base != MAP_FAILED) {
+ int ret = munmap(virtual_base, virtual_size);
+ ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
+ }
+
+ if (backing_base != MAP_FAILED) {
+ int ret = munmap(backing_base, backing_size);
+ ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
+ }
+
+ if (fd != -1) {
+ int ret = close(fd);
+ ASSERT_MSG(ret == 0, "close failed: {}", strerror(errno));
+ }
+ }
+
+ int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create
+};
+
+#else // ^^^ Linux ^^^
#error Please implement the host memory for your platform