Create ata.h

implement the base ata pio mode driver so that the filesystems like fat16, fat32 work. This is the header for that. It will need a iso9660 driver for cdrom etc optical media

kernel/ata.c

@@ -1,91 +0,0 @@
-#include "ata.h"
-#include "io.h"
-#include "print.h"
-
-#define ATA_TIMEOUT 100000
-
-static inline void ata_delay(void) {
-    /* 400ns delay by reading alternate status */
-    inb(ATA_PRIMARY_CTRL);
-    inb(ATA_PRIMARY_CTRL);
-    inb(ATA_PRIMARY_CTRL);
-    inb(ATA_PRIMARY_CTRL);
-}
-
-static bool ata_wait(uint8_t mask) {
-    for (int i = 0; i < ATA_TIMEOUT; i++) {
-        uint8_t status = inb(ATA_PRIMARY_IO + ATA_REG_STATUS);
-        if (!(status & ATA_SR_BSY) && (status & mask))
-            return true;
-    }
-    return false;
-}
-
-bool ata_init(void) {
-    outb(ATA_PRIMARY_IO + ATA_REG_HDDEVSEL, 0xA0); // master
-    ata_delay();
-
-    outb(ATA_PRIMARY_IO + ATA_REG_COMMAND, ATA_CMD_IDENTIFY);
-    ata_delay();
-
-    uint8_t status = inb(ATA_PRIMARY_IO + ATA_REG_STATUS);
-    if (status == 0)
-        return false; // no drive
-
-    if (!ata_wait(ATA_SR_DRQ))
-        return false;
-
-    uint16_t identify[256];
-    for (int i = 0; i < 256; i++)
-        identify[i] = inw(ATA_PRIMARY_IO);
-
-    print_string("[ATA] Primary master detected\n");
-    return true;
-}
-
-bool ata_read_sector(uint32_t lba, uint8_t* buffer) {
-    if (!buffer) return false;
-
-    outb(ATA_PRIMARY_IO + ATA_REG_HDDEVSEL, 0xE0 | ((lba >> 24) & 0x0F));
-    outb(ATA_PRIMARY_IO + ATA_REG_SECCOUNT0, 1);
-    outb(ATA_PRIMARY_IO + ATA_REG_LBA0, (uint8_t)(lba));
-    outb(ATA_PRIMARY_IO + ATA_REG_LBA1, (uint8_t)(lba >> 8));
-    outb(ATA_PRIMARY_IO + ATA_REG_LBA2, (uint8_t)(lba >> 16));
-    outb(ATA_PRIMARY_IO + ATA_REG_COMMAND, ATA_CMD_READ_PIO);
-
-    if (!ata_wait(ATA_SR_DRQ))
-        return false;
-
-    for (int i = 0; i < 256; i++) {
-        uint16_t data = inw(ATA_PRIMARY_IO);
-        buffer[i * 2]     = data & 0xFF;
-        buffer[i * 2 + 1] = data >> 8;
-    }
-
-    ata_delay();
-    return true;
-}
-
-bool ata_write_sector(uint32_t lba, const uint8_t* buffer) {
-    if (!buffer) return false;
-
-    outb(ATA_PRIMARY_IO + ATA_REG_HDDEVSEL, 0xE0 | ((lba >> 24) & 0x0F));
-    outb(ATA_PRIMARY_IO + ATA_REG_SECCOUNT0, 1);
-    outb(ATA_PRIMARY_IO + ATA_REG_LBA0, (uint8_t)(lba));
-    outb(ATA_PRIMARY_IO + ATA_REG_LBA1, (uint8_t)(lba >> 8));
-    outb(ATA_PRIMARY_IO + ATA_REG_LBA2, (uint8_t)(lba >> 16));
-    outb(ATA_PRIMARY_IO + ATA_REG_COMMAND, ATA_CMD_WRITE_PIO);
-
-    if (!ata_wait(ATA_SR_DRQ))
-        return false;
-
-    for (int i = 0; i < 256; i++) {
-        uint16_t word =
-            buffer[i * 2] |
-            (buffer[i * 2 + 1] << 8);
-        outw(ATA_PRIMARY_IO, word);
-    }
-
-    ata_delay();
-    return true;
-}