From 46bb1d3157f9ad575c83a4bfa1e32b0d21bc8546 Mon Sep 17 00:00:00 2001
From: Kartik Agaram <vc@akkartik.com>
Date: Sat, 14 Sep 2019 01:42:29 -0700
Subject: 5650 - support a second OS: soso

https://github.com/ozkl/soso

+ Much smaller than Linux; builds instantly
+ Supports graphics
- No network support
- Doesn't work on a cloud server (yet?)
---
 kernel.soso/keyboard.c | 184 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 kernel.soso/keyboard.c

(limited to 'kernel.soso/keyboard.c')

diff --git a/kernel.soso/keyboard.c b/kernel.soso/keyboard.c
new file mode 100644
index 00000000..8e34ca0e
--- /dev/null
+++ b/kernel.soso/keyboard.c
@@ -0,0 +1,184 @@
+#include "keyboard.h"
+#include "isr.h"
+#include "common.h"
+#include "screen.h"
+#include "ttydriver.h"
+#include "fs.h"
+#include "device.h"
+#include "alloc.h"
+#include "devfs.h"
+#include "list.h"
+
+static uint8* gKeyBuffer = NULL;
+static uint32 gKeyBufferWriteIndex = 0;
+static uint32 gKeyBufferReadIndex = 0;
+
+#define KEYBUFFER_SIZE 128
+
+static BOOL keyboard_open(File *file, uint32 flags);
+static void keyboard_close(File *file);
+static int32 keyboard_read(File *file, uint32 size, uint8 *buffer);
+static int32 keyboard_ioctl(File *file, int32 request, void * argp);
+
+typedef enum ReadMode
+{
+    Blocking = 0,
+    NonBlocking = 1
+} ReadMode;
+
+typedef struct Reader
+{
+    uint32 readIndex;
+    ReadMode readMode;
+} Reader;
+
+static List* gReaders = NULL;
+
+static void handleKeyboardInterrupt(Registers *regs);
+
+void initializeKeyboard()
+{
+    Device device;
+    memset((uint8*)&device, 0, sizeof(Device));
+    strcpy(device.name, "keyboard");
+    device.deviceType = FT_CharacterDevice;
+    device.open = keyboard_open;
+    device.close = keyboard_close;
+    device.read = keyboard_read;
+    device.ioctl = keyboard_ioctl;
+
+    gKeyBuffer = kmalloc(KEYBUFFER_SIZE);
+    memset((uint8*)gKeyBuffer, 0, KEYBUFFER_SIZE);
+
+    gReaders = List_Create();
+
+    registerDevice(&device);
+
+    registerInterruptHandler(IRQ1, handleKeyboardInterrupt);
+}
+
+static BOOL keyboard_open(File *file, uint32 flags)
+{
+    Reader* reader = (Reader*)kmalloc(sizeof(Reader));
+    reader->readIndex = 0;
+    reader->readMode = Blocking;
+
+    if (gKeyBufferWriteIndex > 0)
+    {
+        reader->readIndex = gKeyBufferWriteIndex;
+    }
+    file->privateData = (void*)reader;
+
+    List_Append(gReaders, file);
+
+    return TRUE;
+}
+
+static void keyboard_close(File *file)
+{
+    //Screen_PrintF("keyboard_close\n");
+
+    Reader* reader = (Reader*)file->privateData;
+
+    kfree(reader);
+
+    List_RemoveFirstOccurrence(gReaders, file);
+}
+
+static int32 keyboard_read(File *file, uint32 size, uint8 *buffer)
+{
+    Reader* reader = (Reader*)file->privateData;
+
+    uint32 readIndex = reader->readIndex;
+
+    if (reader->readMode == Blocking)
+    {
+        while (readIndex == gKeyBufferWriteIndex)
+        {
+            file->thread->state = TS_WAITIO;
+            file->thread->state_privateData = keyboard_read;
+            enableInterrupts();
+            halt();
+        }
+    }
+
+    disableInterrupts();
+
+    if (readIndex == gKeyBufferWriteIndex)
+    {
+        //non-blocking return here
+        return -1;
+    }
+
+    buffer[0] = gKeyBuffer[readIndex];
+    readIndex++;
+    readIndex %= KEYBUFFER_SIZE;
+
+    reader->readIndex = readIndex;
+
+    return 1;
+}
+
+static int32 keyboard_ioctl(File *file, int32 request, void * argp)
+{
+    Reader* reader = (Reader*)file->privateData;
+
+    int cmd = (int)argp;
+
+    switch (request)
+    {
+    case 0: //get
+        *(int*)argp = (int)reader->readMode;
+        return 0;
+        break;
+    case 1: //set
+        if (cmd == 0)
+        {
+            reader->readMode = Blocking;
+
+            return 0;
+        }
+        else if (cmd == 1)
+        {
+            reader->readMode = NonBlocking;
+            return 0;
+        }
+        break;
+    default:
+        break;
+    }
+
+    return -1;
+}
+
+static void handleKeyboardInterrupt(Registers *regs)
+{
+    uint8 scancode = 0;
+    do
+    {
+        scancode = inb(0x64);
+    } while ((scancode & 0x01) == 0);
+
+    scancode = inb(0x60);
+
+    gKeyBuffer[gKeyBufferWriteIndex] = scancode;
+    gKeyBufferWriteIndex++;
+    gKeyBufferWriteIndex %= KEYBUFFER_SIZE;
+
+    //Wake readers
+    List_Foreach(n, gReaders)
+    {
+        File* file = n->data;
+
+        if (file->thread->state == TS_WAITIO)
+        {
+            if (file->thread->state_privateData == keyboard_read)
+            {
+                file->thread->state = TS_RUN;
+                file->thread->state_privateData = NULL;
+            }
+        }
+    }
+
+    sendKeyInputToTTY(getActiveTTY(), scancode);
+}
-- 
cgit 1.4.1-2-gfad0