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Tom-on
7826b9b7d4
- include/ now has subdirs - standard C headers will be in 'include/c'. Any program can include these - all other header shall only be used by the kernel
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
#ifndef DRIVE_H
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#define DRIVE_H
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#include <stdint.h>
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#include <ports/io.h>
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#define PIO_PORT 0x1f0
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#define READ_COMMAND 0x20
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#define WRITE_COMMAND 0x30
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#define CACHE_FLUSH 0xE7
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extern uint8_t driveNum;
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void diskRead(uint32_t lbaAddress, uint8_t sectorCount, char* dst) {
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outb(PIO_PORT + 6, ((lbaAddress >> 24) & 0x0f) | 0xe0); // 6 - Use LBA; 4 - Drive number; 3-0 - Highest lba address nibble
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outb(PIO_PORT + 2, sectorCount); // Sector count register
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outb(PIO_PORT + 3, (uint8_t)(lbaAddress)); // Lowest lba address byte
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outb(PIO_PORT + 4, (uint8_t)(lbaAddress >> 8)); // Middle lba address byte
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outb(PIO_PORT + 5, (uint8_t)(lbaAddress >> 16)); // High lba address byte
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outb(PIO_PORT + 7, READ_COMMAND); // Command register
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uint16_t* address = (uint16_t*)dst;
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for (uint8_t i = sectorCount; i > 0; i--) {
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while (inb(PIO_PORT + 7) & (1 << 7)); // Poll status register untill BSY bit is clear
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for (size_t j = 0; j < 256; j++) {
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*address++ = inw(PIO_PORT); // Read 256 words (512 Bytes = 1 Sector)
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}
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for (uint8_t delay = 0; delay < 4; delay++) { // 400ns delay
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inb(0x3f6); // Alternate status register
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}
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}
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}
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void diskWrite(uint32_t lbaAddress, uint8_t sectorCount, char* src) {
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outb(PIO_PORT + 6, ((lbaAddress >> 24) & 0x0f) | 0xe0); // 6 - Use LBA; 4 - Drive number; 3-0 - Highest lba address nibble
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outb(PIO_PORT + 2, sectorCount); // Sector count register
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outb(PIO_PORT + 3, (uint8_t)(lbaAddress)); // Lowest lba address byte
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outb(PIO_PORT + 4, (uint8_t)(lbaAddress >> 8)); // Middle lba address byte
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outb(PIO_PORT + 5, (uint8_t)(lbaAddress >> 16)); // High lba address byte
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outb(PIO_PORT + 7, WRITE_COMMAND); // Command register
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uint16_t* address = (uint16_t*)src;
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for (uint8_t i = sectorCount; i > 0; i--) {
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while (inb(PIO_PORT + 7) & (1 << 7)); // Poll status register untill BSY bit is clear
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for (size_t j = 0; j < 256; j++) {
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outw(PIO_PORT, *address++); // Write 256 words (512 Bytes = 1 Sector)
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}
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for (uint8_t delay = 0; delay < 4; delay++) { // 400ns delay
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inb(0x3f6); // Alternate status register
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}
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}
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outb(PIO_PORT + 7, CACHE_FLUSH); // Cache flush
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while (inb(PIO_PORT + 7) & (1 << 7)); // Poll status register untill BSY bit is clear
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}
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#endif
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