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https://github.com/RGBCube/serenity
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Kernel+LibC: Add a DebugLogDevice that forwards everything to I/O port 0xe9.
This is then used to implement the userspace dbgprintf() in a far more efficient way than what we had before. :^)
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parent
3b986da643
commit
3817f5f619
7 changed files with 61 additions and 7 deletions
28
Kernel/Devices/DebugLogDevice.cpp
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28
Kernel/Devices/DebugLogDevice.cpp
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@ -0,0 +1,28 @@
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#include <Kernel/Devices/DebugLogDevice.h>
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#include <Kernel/IO.h>
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static DebugLogDevice* s_the;
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DebugLogDevice& DebugLogDevice::the()
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{
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ASSERT(s_the);
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return *s_the;
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}
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DebugLogDevice::DebugLogDevice()
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: CharacterDevice(1, 18)
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{
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s_the = this;
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}
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DebugLogDevice::~DebugLogDevice()
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{
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}
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ssize_t DebugLogDevice::write(Process&, const byte* data, ssize_t data_size)
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{
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for (int i = 0; i < data_size; ++i)
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IO::out8(0xe9, data[i]);
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return data_size;
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}
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17
Kernel/Devices/DebugLogDevice.h
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17
Kernel/Devices/DebugLogDevice.h
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#include <Kernel/Devices/CharacterDevice.h>
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class DebugLogDevice final : public CharacterDevice {
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public:
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DebugLogDevice();
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virtual ~DebugLogDevice() override;
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static DebugLogDevice& the();
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private:
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// ^CharacterDevice
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virtual ssize_t read(Process&, byte*, ssize_t) override { return 0; }
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virtual ssize_t write(Process&, const byte*, ssize_t) override;
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virtual bool can_write(Process&) const override { return true; }
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virtual bool can_read(Process&) const override { return true; }
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virtual const char* class_name() const override { return "DebugLogDevice"; }
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};
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@ -57,6 +57,7 @@ VFS_OBJS = \
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Devices/FullDevice.o \
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Devices/ZeroDevice.o \
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Devices/RandomDevice.o \
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Devices/DebugLogDevice.o \
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FileSystem/FileSystem.o \
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FileSystem/DiskBackedFileSystem.o \
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FileSystem/Ext2FileSystem.o \
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@ -24,6 +24,7 @@
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#include <Kernel/Devices/BXVGADevice.h>
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#include <Kernel/Net/E1000NetworkAdapter.h>
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#include <Kernel/Net/NetworkTask.h>
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#include <Kernel/Devices/DebugLogDevice.h>
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#define SPAWN_TERMINAL
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//#define SPAWN_LAUNCHER
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@ -42,6 +43,7 @@ VirtualConsole* tty2;
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VirtualConsole* tty3;
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KeyboardDevice* keyboard;
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PS2MouseDevice* ps2mouse;
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DebugLogDevice* dev_debuglog;
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NullDevice* dev_null;
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VFS* vfs;
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@ -151,6 +153,7 @@ extern "C" [[noreturn]] void init()
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init_ksyms();
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vfs = new VFS;
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dev_debuglog = new DebugLogDevice;
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auto console = make<Console>();
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@ -25,6 +25,7 @@ mknod mnt/dev/random c 1 8
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mknod mnt/dev/null c 1 3
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mknod mnt/dev/zero c 1 5
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mknod mnt/dev/full c 1 7
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mknod -m 666 mnt/dev/debuglog c 1 18
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mknod mnt/dev/keyboard c 85 1
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mknod mnt/dev/psaux c 10 1
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mknod -m 666 mnt/dev/ptmx c 5 2
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