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#include "mouse.h"
#include "isr.h"
#include "common.h"
#include "device.h"
#include "alloc.h"
#include "devfs.h"
#include "list.h"
#include "fifobuffer.h"
#include "spinlock.h"
static void handleMouseInterrupt(Registers *regs);
static uint8 gMouseByteCounter = 0;
static void prepareForRead();
static void prepareForWrite();
static void writeMouse(uint8 data);
static void handleMouseInterrupt(Registers *regs);
static BOOL mouse_open(File *file, uint32 flags);
static void mouse_close(File *file);
static int32 mouse_read(File *file, uint32 size, uint8 *buffer);
#define MOUSE_PACKET_SIZE 3
uint8 gMousePacket[MOUSE_PACKET_SIZE];
static List* gReaders = NULL;
static Spinlock gReadersLock;
void initializeMouse()
{
Device device;
memset((uint8*)&device, 0, sizeof(Device));
strcpy(device.name, "psaux");
device.deviceType = FT_CharacterDevice;
device.open = mouse_open;
device.close = mouse_close;
device.read = mouse_read;
registerInterruptHandler(IRQ12, handleMouseInterrupt);
registerDevice(&device);
memset(gMousePacket, 0, MOUSE_PACKET_SIZE);
gReaders = List_Create();
Spinlock_Init(&gReadersLock);
prepareForWrite();
outb(0x64, 0x20); //get status command
uint8 status = inb(0x60);
status = status | 2; //enable IRQ12
outb(0x64, 0x60); //set status command
outb(0x60, status);
outb(0x64, 0xA8); //enable Auxiliary Device command
writeMouse(0xF4); //0xF4: Enable Packet Streaming
}
static BOOL mouse_open(File *file, uint32 flags)
{
FifoBuffer* fifo = FifoBuffer_create(60);
file->privateData = (void*)fifo;
Spinlock_Lock(&gReadersLock);
List_Append(gReaders, file);
Spinlock_Unlock(&gReadersLock);
return TRUE;
}
static void mouse_close(File *file)
{
Spinlock_Lock(&gReadersLock);
List_RemoveFirstOccurrence(gReaders, file);
Spinlock_Unlock(&gReadersLock);
FifoBuffer* fifo = (FifoBuffer*)file->privateData;
FifoBuffer_destroy(fifo);
}
static int32 mouse_read(File *file, uint32 size, uint8 *buffer)
{
FifoBuffer* fifo = (FifoBuffer*)file->privateData;
while (FifoBuffer_getSize(fifo) < MOUSE_PACKET_SIZE)
{
file->thread->state = TS_WAITIO;
file->thread->state_privateData = mouse_read;
enableInterrupts();
halt();
}
disableInterrupts();
uint32 available = FifoBuffer_getSize(fifo);
uint32 smaller = MIN(available, size);
FifoBuffer_dequeue(fifo, buffer, smaller);
return smaller;
}
static void prepareForRead()
{
//https://wiki.osdev.org/Mouse_Input
//Bytes cannot be read from port 0x60 until bit 0 (value=1) of port 0x64 is set
int32 tryCount = 1000;
uint8 data = 0;
do
{
data = inb(0x64);
} while (((data & 0x01) == 0) && --tryCount > 0);
}
static void prepareForWrite()
{
//https://wiki.osdev.org/Mouse_Input
//All output to port 0x60 or 0x64 must be preceded by waiting for bit 1 (value=2) of port 0x64 to become clear
int32 tryCount = 1000;
uint8 data = 0;
do
{
data = inb(0x64);
} while (((data & 0x02) != 0) && --tryCount > 0);
}
static void writeMouse(uint8 data)
{
prepareForWrite();
outb(0x64, 0xD4);
prepareForWrite();
outb(0x60, data);
}
static void handleMouseInterrupt(Registers *regs)
{
uint8 status = 0;
//0x20 (5th bit is mouse bit)
//read from 0x64, if its mouse bit is 1 then data is available at 0x60!
int32 tryCount = 1000;
do
{
status = inb(0x64);
} while (((status & 0x20) == 0) && --tryCount > 0);
uint8 data = inb(0x60);
gMousePacket[gMouseByteCounter] = data;
gMouseByteCounter += 1;
if (gMouseByteCounter == MOUSE_PACKET_SIZE)
{
gMouseByteCounter = 0;
Spinlock_Lock(&gReadersLock);
//Wake readers
List_Foreach(n, gReaders)
{
File* file = n->data;
FifoBuffer* fifo = (FifoBuffer*)file->privateData;
FifoBuffer_enqueue(fifo, gMousePacket, MOUSE_PACKET_SIZE);
if (file->thread->state == TS_WAITIO)
{
if (file->thread->state_privateData == mouse_read)
{
file->thread->state = TS_RUN;
file->thread->state_privateData = NULL;
}
}
}
Spinlock_Unlock(&gReadersLock);
}
//printkf("mouse:%d\n", data);
}
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