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