From 855b7ab75c305a8d79e21e72d0a00547c9479f3c Mon Sep 17 00:00:00 2001
From: DH <dh.rpcs3@gmail.com>
Date: Tue, 11 Jul 2023 23:14:33 +0300
Subject: [PATCH] [orbis-kernel] WIP new io device implementation Not used yet

---
 orbis-kernel/include/orbis/file.hpp | 56 +++++++++++++++++++++++++++++
 orbis-kernel/include/orbis/stat.hpp | 26 ++++++++++++++
 orbis-kernel/include/orbis/uio.hpp  | 29 +++++++++++++++
 3 files changed, 111 insertions(+)
 create mode 100644 orbis-kernel/include/orbis/file.hpp
 create mode 100644 orbis-kernel/include/orbis/stat.hpp
 create mode 100644 orbis-kernel/include/orbis/uio.hpp

diff --git a/orbis-kernel/include/orbis/file.hpp b/orbis-kernel/include/orbis/file.hpp
new file mode 100644
index 000000000..98a0780a2
--- /dev/null
+++ b/orbis-kernel/include/orbis/file.hpp
@@ -0,0 +1,56 @@
+#pragma once
+
+#include "KernelAllocator.hpp"
+#include "error/ErrorCode.hpp"
+#include <atomic>
+#include <cstdint>
+
+namespace orbis {
+struct File;
+struct KNote;
+struct Thread;
+struct Stat;
+struct Uio;
+
+struct FileOps {
+  std::int32_t flags;
+  ErrorCode (*ioctl)(File *file, std::uint64_t request, void *argp,
+                     Thread *thread) = nullptr;
+  ErrorCode (*rdwr)(File *file, Uio *uio, Thread *thread) = nullptr;
+  ErrorCode (*close)(File *file, Thread *thread) = nullptr;
+  ErrorCode (*lseek)(File *file, std::uint64_t *offset, std::uint32_t whence,
+                     Thread *thread) = nullptr;
+
+  ErrorCode (*truncate)(File *file, std::uint64_t len,
+                        Thread *thread) = nullptr;
+
+  ErrorCode (*poll)(File *file, std::uint32_t events, Thread *thread) = nullptr;
+
+  ErrorCode (*kqfilter)(File *file, KNote *kn, Thread *thread) = nullptr;
+
+  ErrorCode (*stat)(File *file, Stat *sb, Thread *thread) = nullptr;
+
+  // TODO: chown
+  // TODO: chmod
+
+  ErrorCode (*mmap)(File *file, void **address, std::uint64_t size,
+                    std::int32_t prot, std::int32_t flags, std::int64_t offset,
+                    Thread *thread) = nullptr;
+  ErrorCode (*munmap)(File *file, void **address, std::uint64_t size,
+                      Thread *thread) = nullptr;
+};
+
+struct File {
+  FileOps *ops;
+  Ref<RcBase> device;
+  std::atomic<unsigned> refs{0};
+
+  void incRef() { refs.fetch_add(1, std::memory_order::acquire); }
+
+  void decRef() {
+    if (refs.fetch_sub(1, std::memory_order::release) == 1) {
+      kdelete(this);
+    }
+  }
+};
+} // namespace orbis
diff --git a/orbis-kernel/include/orbis/stat.hpp b/orbis-kernel/include/orbis/stat.hpp
new file mode 100644
index 000000000..65f32be90
--- /dev/null
+++ b/orbis-kernel/include/orbis/stat.hpp
@@ -0,0 +1,26 @@
+#pragma once
+
+#include "orbis-config.hpp"
+#include "time.hpp"
+
+namespace orbis {
+struct Stat {
+  uint32_t dev;     // inode's device
+  uint32_t ino;     // inode's number
+  uint16_t mode;    // inode protection mode
+  uint16_t nlink;   // number of hard links
+  uint32_t uid;     // user ID of the file's owner
+  uint32_t gid;     // group ID of the file's group
+  uint32_t rdev;    // device type
+  timespec atim;    // time of last access
+  timespec mtim;    // time of last data modification
+  timespec ctim;    // time of last file status change
+  off_t size;       // file size, in bytes
+  int64_t blocks;   // blocks allocated for file
+  uint32_t blksize; // optimal blocksize for I/O
+  uint32_t flags;   // user defined flags for file
+  uint32_t gen;     // file generation number
+  int32_t lspare;
+  timespec birthtim; // time of file creation
+};
+} // namespace orbis
diff --git a/orbis-kernel/include/orbis/uio.hpp b/orbis-kernel/include/orbis/uio.hpp
new file mode 100644
index 000000000..9ebbe5d16
--- /dev/null
+++ b/orbis-kernel/include/orbis/uio.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <cstdint>
+
+namespace orbis {
+struct IoVec {
+  void *base;        // Base address
+  std::uint64_t len; // Length
+};
+
+enum class UioRw : std::uint8_t { Read, Write };
+
+// Segment flag values
+enum class UioSeg : std::uint8_t {
+  UserSpace, // from user data space
+  SysSpace,  // from system space
+  NoCopy     // don't copy, already in object
+};
+
+struct Uio {
+  std::uint64_t offset;
+  IoVec *iov;
+  std::int32_t iovcnt;
+  std::int32_t resid;
+  UioSeg segflg;
+  UioRw rw;
+  void *td;
+};
+} // namespace orbis