Add the basic character devices to kernel.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/aec8ab0a606

AK/StdLib.h

@@ -55,6 +55,13 @@ T exchange(T& a, U&& b)
     return tmp;
 }
 
+template<typename T, typename U>
+void swap(T& a, U& b)
+{
+    U tmp = move((U&)a);
+    a = (T&&)move(b);
+    b = move(tmp);
+}
 
 }
 
@@ -63,5 +70,6 @@ using AK::max;
 using AK::move;
 using AK::forward;
 using AK::exchange;
+using AK::swap;
 using AK::ceilDiv;
 

AK/kstdio.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#ifdef SERENITY_KERNEL
+#include <Kernel/kstdio.h>
+#else
+#include <cstdio>
+#define kprintf printf
+#endif

Kernel/IPC.h

@@ -3,6 +3,7 @@
 #include "types.h"
 #include "DataBuffer.h"
 #include "RefPtr.h"
+#include <AK/StdLib.h>
 
 /* IPC message types. There will be moar. */
 #define MSG_INTERRUPT 0x00000001

Kernel/Makefile

@@ -22,7 +22,12 @@ KERNEL_OBJS = \
        IDEDiskDevice.o
 
 VFS_OBJS = \
-    ../VirtualFileSystem/DiskDevice.o
+    ../VirtualFileSystem/DiskDevice.o \
+    ../VirtualFileSystem/CharacterDevice.o \
+    ../VirtualFileSystem/NullDevice.o \
+    ../VirtualFileSystem/FullDevice.o \
+    ../VirtualFileSystem/ZeroDevice.o \
+    ../VirtualFileSystem/RandomDevice.o
 
 OBJS = $(KERNEL_OBJS) $(VFS_OBJS)
 

Kernel/String.cpp

@@ -1,5 +1,5 @@
 #include "String.h"
-#include "StdLib.h"
+#include <AK/StdLib.h>
 
 String::String()
 {

Kernel/init.cpp

@@ -15,6 +15,11 @@
 #include "FileSystem.h"
 #include "Userspace.h"
 #include "IDEDiskDevice.h"
+#include <VirtualFileSystem/NullDevice.h>
+#include <VirtualFileSystem/ZeroDevice.h>
+#include <VirtualFileSystem/FullDevice.h>
+#include <VirtualFileSystem/RandomDevice.h>
+#include <AK/OwnPtr.h>
 
 #if 0
 /* Keyboard LED disco task ;^) */
@@ -124,7 +129,11 @@ void init()
     Disk::initialize();
     FileSystem::initialize();
 
-    auto hd0 = IDEDiskDevice::create();
+    auto dev_hd0 = IDEDiskDevice::create();
+    auto dev_null = make<NullDevice>();
+    auto dev_full = make<FullDevice>();
+    auto dev_zero = make<ZeroDevice>();
+    auto dev_random = make<RandomDevice>();
 
 //    new Task(motd_main, "motd", IPC::Handle::MotdTask, Task::Ring0);
     new Task(user_main, "user", IPC::Handle::UserTask, Task::Ring3);

Kernel/kstdio.h

@@ -0,0 +1,3 @@
+#pragma once
+
+#include "VGA.h"

Kernel/types.h

@@ -6,48 +6,6 @@
 #define PUBLIC
 #define PRIVATE static
 
-template <typename T>
-T&& move(T& arg)
-{
-    return static_cast<T&&>(arg);
-}
-
-template<typename T>
-T min(T a, T b)
-{
-    return (a < b) ? a : b;
-}
-
-template<typename T>
-T max(T a, T b)
-{
-    return (a > b) ? a : b;
-}
-
-template<typename T, typename U>
-void swap(T& a, U& b)
-{
-    U tmp = move((U&)a);
-    a = (T&&)move(b);
-    b = move(tmp);
-}
-
-template<typename T>
-struct identity {
-    typedef T type;
-};
-template<typename T>
-T&& forward(typename identity<T>::type&& param)
-{ return static_cast<typename identity<T>::type&&>(param); }
-
-template<typename T, typename U>
-T exchange(T& a, U&& b)
-{
-    T tmp = move(a);
-    a = move(b);
-    return tmp;
-}
-
 typedef unsigned char BYTE;
 typedef unsigned short WORD;
 typedef unsigned int DWORD;

VirtualFileSystem/FullDevice.cpp

@@ -2,8 +2,7 @@
 #include "Limits.h"
 #include "sys-errno.h"
 #include <AK/StdLib.h>
-#include <cstring>
-#include <cstdio>
+#include <AK/kstdio.h>
 
 FullDevice::FullDevice()
 {
@@ -15,7 +14,7 @@ FullDevice::~FullDevice()
 
 Unix::ssize_t FullDevice::read(byte* buffer, Unix::size_t bufferSize)
 {
-    printf("read from full device\n");
+    kprintf("FullDevice: read from full\n");
     Unix::size_t count = min(GoodBufferSize, bufferSize);
     memset(buffer, 0, count);
     return count;

VirtualFileSystem/Limits.h

@@ -1,9 +1,14 @@
 #pragma once
 
-#include <limits>
 #include "UnixTypes.h"
 
+#ifdef SERENITY_KERNEL
+inline static const Unix::off_t maxFileOffset = 9223372036854775807LL;
+#else
+#include <limits>
+inline static const Unix::off_t maxFileOffset = std::numeric_limits<Unix::off_t>::max();
+#endif
+
 static const Unix::size_t GoodBufferSize = 4096;
 
-inline static const Unix::off_t maxFileOffset = std::numeric_limits<Unix::off_t>::max();
 

VirtualFileSystem/NullDevice.cpp

@@ -1,8 +1,7 @@
 #include "NullDevice.h"
 #include "Limits.h"
 #include <AK/StdLib.h>
-#include <cstring>
-#include <cstdio>
+#include <AK/kstdio.h>
 
 NullDevice::NullDevice()
 {
@@ -14,7 +13,7 @@ NullDevice::~NullDevice()
 
 Unix::ssize_t NullDevice::read(byte*, Unix::size_t)
 {
-    printf("read from null\n");
+    kprintf("NullDevice: read from null\n");
     return 0;
 }
 

VirtualFileSystem/RandomDevice.cpp

@@ -1,8 +1,6 @@
 #include "RandomDevice.h"
 #include "Limits.h"
 #include <AK/StdLib.h>
-#include <cstring>
-#include <cstdio>
 
 RandomDevice::RandomDevice()
 {
@@ -23,10 +21,12 @@ static int myrand()
     return((unsigned)(next/((MY_RAND_MAX + 1) * 2)) % (MY_RAND_MAX + 1));
 }
 
+#if 0
 static void mysrand(unsigned seed)
 {
     next = seed;
 }
+#endif
 
 Unix::ssize_t RandomDevice::read(byte* buffer, Unix::size_t bufferSize)
 {

VirtualFileSystem/ZeroDevice.cpp

@@ -1,8 +1,7 @@
 #include "ZeroDevice.h"
 #include "Limits.h"
 #include <AK/StdLib.h>
-#include <cstring>
-#include <cstdio>
+#include <AK/kstdio.h>
 
 ZeroDevice::ZeroDevice()
 {
@@ -14,7 +13,7 @@ ZeroDevice::~ZeroDevice()
 
 Unix::ssize_t ZeroDevice::read(byte* buffer, Unix::size_t bufferSize)
 {
-    printf("read from zero device\n");
+    kprintf("ZeroDevice: read from zero\n");
     Unix::size_t count = min(GoodBufferSize, bufferSize);
     memset(buffer, 0, count);
     return count;