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FDD Dection Is Fixed!

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This commit is contained in:
Tyler McGurrin 2025-05-30 19:55:26 -04:00
parent 3dadaf1582
commit 486c92954a
8 changed files with 173 additions and 67 deletions
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64
src/kernel/dri/cmos.c
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@ -5,8 +5,72 @@
\*----------------*/
#include "cmos.h"
#include <stdio.h>
#include <stdint.h>
#include <arch/i686/io.h>
#include <arch/i686/irq.h>
#include <util/binary.h>
#define CMOS_ADDPORT 0x70
#define CMOS_DATAPORT 0x71
void CMOS_RTC_Handler()
{
}
uint8_t Read_CMOS(uint8_t Register)
{
uint8_t data;
i686_outb(0x70, Register);
data = i686_inb(CMOS_DATAPORT);
return data;
}
int Master_FDD_Detect()
{
int Buffer;
int FDDType;
/* FDD Drive Values
Value: Drive Type:
00h no drive
01h 360 KB 5.25 Drive
02h 1.2 MB 5.25 Drive
03h 720 KB 3.5 Drive
04h 1.44 MB 3.5 Drive
05h 2.88 MB 3.5 drive*/
Buffer = BCD2BIN(Read_CMOS(CMOS_Floppy_Register));
int bit = Get_Bit(Buffer, 1);
int i = 2;
while(i < 5) {
FDDType = bit & bit;
bit = Get_Bit(Buffer, i);
i++;
}
return FDDType;
}
int Slave_FDD_Detect()
{
int Buffer;
int FDDType;
/* FDD Drive Values
Value: Drive Type:
00h no drive
01h 360 KB 5.25 Drive
02h 1.2 MB 5.25 Drive
03h 720 KB 3.5 Drive
04h 1.44 MB 3.5 Drive
05h 2.88 MB 3.5 drive*/
Buffer = BCD2BIN(Read_CMOS(CMOS_Floppy_Register));
int bit = Get_Bit(Buffer, 4);
int i = 5;
while(i < 9) {
FDDType = bit & bit;
bit = Get_Bit(Buffer, i);
i++;
}
return FDDType;
}

30
src/kernel/dri/cmos.h
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@ -5,4 +5,32 @@
\*----------------*/
#pragma once
void CMOS_RTC_Handler();
#include <stdint.h>
#define BCD2BIN(bcd) ((((bcd)&15) + ((bcd)>>4)*10))
void CMOS_RTC_Handler();
int Master_FDD_Detect();
int Slave_FDD_Detect();
uint8_t Read_CMOS(uint8_t Register);
enum CMOSRegisters
{
CMOS_Floppy_Register = 0x10
};
/* RTC Registers
Register Contents Range
0x00 Seconds 0–59
0x02 Minutes 0–59
0x04 Hours 0–23 in 24-hour mode,
1–12 in 12-hour mode, highest bit set if pm
0x06 Weekday 1–7, Sunday = 1
0x07 Day of Month 1–31
0x08 Month 1–12
0x09 Year 0–99
0x32 Century (maybe) 19–20?
0x0A Status Register A
0x0B Status Register B
*/

61
src/kernel/dri/disk/floppy.c
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@ -7,7 +7,6 @@
#include <stdint.h>
#include <stdio.h>
#include <util/binary.h>
#include <arch/i686/io.h>
#include <arch/i686/irq.h>
@ -15,7 +14,7 @@
void Floppy_Handler()
{
printf("IRQ 6 Called");
}
@ -28,60 +27,6 @@ void Floppy_Handler()
// Basically Gonna hard-code the driver for 1.44MB Drives
// Since Nanite is only capable of running off one without modifications to the bootloader,
// this is not an issue... but its sure as shit annoying
int Master_FDD_Detect()
{
uint8_t Buffer;
int FDDType;
int bit1, bit2, bit3, bit4;
/* FDD Drive Values
Value: Drive Type:
00h no drive
01h 360 KB 5.25 Drive
02h 1.2 MB 5.25 Drive
03h 720 KB 3.5 Drive
04h 1.44 MB 3.5 Drive
05h 2.88 MB 3.5 drive*/
Buffer = i686_inb(PORT_FLOPPY_TYPE);
// Correction im stupid...
// bit1 = Byte_Parse(Buffer, 0);
// bit2 = Byte_Parse(Buffer, 1);
// bit3 = Byte_Parse(Buffer, 2);
// bit4 = Byte_Parse(Buffer, 3);
// printf("Bits: %d, %d, %d, %d\n", bit1, bit2, bit3, bit4);
printf("Buffer: %s", Buffer);
// int bit = Byte_Parse(Buffer, 0);
// int i = 1;
// while(i < 4) {
// FDDType = bit & bit;
// bit = Byte_Parse(Buffer, i);
// i++;
// printf("MFDD Bit %d: %d\n", i, bit);
// }
FDDType = bit1 & bit2 & bit3 & bit4;
return FDDType;
}
int Slave_FDD_Detect()
{
int Buffer;
int FDDType;
/* FDD Drive Values
Value: Drive Type:
00h no drive
01h 360 KB 5.25 Drive
02h 1.2 MB 5.25 Drive
03h 720 KB 3.5 Drive
04h 1.44 MB 3.5 Drive
05h 2.88 MB 3.5 drive*/
Buffer = i686_inb(PORT_FLOPPY_TYPE);
int bit = Byte_Parse(Buffer, 3);
int i = 4;
while(i < 8) {
FDDType = bit & bit;
bit = Byte_Parse(Buffer, i);
i++;
printf("SFDD Bit %d: %d\n", i, bit);
}
return FDDType;
}
// Moved to CMOS Driver.

59
src/kernel/dri/disk/floppy.h
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@ -7,6 +7,65 @@
void Floppy_Handler();
/* DOR Command Table
Mnemonic bit number value meaning/usage
MOTD 7 0x80 Set to turn drive 3's motor ON
MOTC 6 0x40 Set to turn drive 2's motor ON
MOTB 5 0x20 Set to turn drive 1's motor ON
MOTA 4 0x10 Set to turn drive 0's motor ON
IRQ 3 8 Set to enable IRQs and DMA
RESET 2 4 Clear = enter reset mode, Set = normal operation
DSEL1 and 0 0, 1 3 "Select" drive number for next access
*/
enum FloppyDORBitflags
{
DOR_MOTD = 0x80,
DOR_MOTC = 0x40,
DOR_MOTB = 0x20,
DOR_MOTA = 0x10,
DOR_IRQ = 0x08,
DOR_RESET = 0x04,
DOR_DSEL1 = 0x01
};
/* MSR Commands
Mnemonic Bit Value
RQM 7 0x80
DIO 6 0x40
NDMA 5 0x20
CB 4 0x10
ACTD 3 8
ACTC 2 4
ACTB 1 2
ACTA 0 1
*/
enum FloppyMSRBitflags
{
MSR_RQM = 0x80, // Set if it's OK (or mandatory) to exchange bytes with the FIFO IO port
MSR_DIO = 0x40, // Set if FIFO IO port expects an IN opcode
MSR_NDMA = 0x20, // Set in Execution phase of PIO mode read/write commands only.
MSR_CB = 0x10, // Command Busy: set when command byte received, cleared at end of Result phase
MSR_ACTD = 0x08, // Drive 3 is seeking
MSR_ACTC = 0x04, // Drive 2 is seeking
MSR_ACTB = 0x02, // Drive 1 is seeking
MSR_ACTA = 0x01, // Drive 0 is seeking
};
// Bottom 2 Bits of DSR match CCR
enum FloppyRegisters
{
STATUS_REGISTER_A = 0x3F0, // read-only
STATUS_REGISTER_B = 0x3F1, // read-only
DIGITAL_OUTPUT_REGISTER = 0x3F2,
TAPE_DRIVE_REGISTER = 0x3F3, // Basically Useless, unless for some reason you have a tape drive
MAIN_STATUS_REGISTER = 0x3F4, // read-only
DATARATE_SELECT_REGISTER = 0x3F4, // write-only
DATA_FIFO = 0x3F5,
DIGITAL_INPUT_REGISTER = 0x3F7, // read-only
CONFIGURATION_CONTROL_REGISTER = 0x3F7 // write-only
};
enum FloppyCommands
{
READ_TRACK = 2, // generates IRQ6

3
src/kernel/main.c
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@ -68,6 +68,9 @@ void __attribute__((section(".entry"))) start(BootParams* bootParams) {
printf("Load Basic Storage Drivers...");
i686_IRQ_RegisterHandler(6, Floppy_Handler);
printf("Done!\n");
masterFDDType = Master_FDD_Detect();
slaveFDDType = Slave_FDD_Detect();
Print_Storage_Types(masterFDDType, slaveFDDType);

17
src/kernel/util/binary.c
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@ -6,10 +6,15 @@
#include <stdint.h>
int Byte_Parse(int8_t byteFlag, int whichBit)
uint8_t Get_Bit(uint8_t bits, uint8_t pos)
{
if (whichBit > 0 && whichBit <= 8)
return (byteFlag & (1<<(whichBit-1)));
else
return 0;
}
return (bits >> pos) & 0x01;
}
// int Byte_Parse(int8_t byteFlag, int whichBit)
// {
// if (whichBit > 0 && whichBit <= 8)
// return (byteFlag & (1<<(whichBit-1)));
// else
// return 0;
// }

4
src/kernel/util/binary.h
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@ -8,4 +8,6 @@
#define FLAG_SET(x, flag) x |= (flag)
#define FLAG_UNSET(x, flag) x &= ~(flag)
int Byte_Parse(int8_t byteFlag, int whichBit);
uint8_t Get_Bit(uint8_t bits, uint8_t pos);
//int Byte_Parse(int8_t byteFlag, int whichBit);

2
src/libs/version.h
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@ -6,5 +6,5 @@
#pragma once
#define LOGO " _ _____ _ __________________\n / | / / | / | / / _/_ __/ ____/\n / |/ / /| | / |/ // / / / / __/ \n / /| / ___ |/ /| // / / / / /___ \n/_/ |_/_/ |_/_/ |_/___/ /_/ /_____/ \n"
#define VERSION "RD-00012"
#define VERSION "RD-00014"
#define BOOTLOGO " _ ______ ____ ____ ______\n / | / / __ )/ __ \\/ __ /_ __/\n / |/ / __ / / / / / / // / \n / /| / /_/ / /_/ / /_/ // / \n/_/ |_/_____/\\____/\\____//_/ \n"