c07ec030a7
Implement PIO-mode IDE driver that scans primary and secondary channels for ATA hard drives and ATAPI CD/DVD drives using IDENTIFY commands. Features: - Scans 4 possible devices (2 channels x 2 drives each) - ATA IDENTIFY DEVICE for hard drives - ATAPI IDENTIFY PACKET DEVICE for CD/DVD drives - PIO-mode 28-bit LBA sector read/write for ATA drives - Model string extraction and sector count parsing - Registers as kernel driver via REGISTER_DRIVER macro - Registers devices with devicefs: ATA → hdd class, ATAPI → cd class - Added inw/outw to port_io.h for 16-bit I/O Tested: QEMU detects hdd1 (QEMU HARDDISK) and cd1 (QEMU DVD-ROM).
38 lines
804 B
C
38 lines
804 B
C
#ifndef PORT_IO_H
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#define PORT_IO_H
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#include <stdint.h>
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static inline void outb(uint16_t port, uint8_t val)
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{
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asm volatile ( "outb %b0, %w1" : : "a"(val), "Nd"(port) );
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}
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static inline uint8_t inb(uint16_t port)
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{
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uint8_t ret;
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asm volatile ( "inb %w1, %b0" : "=a"(ret) : "Nd"(port) );
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return ret;
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}
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static inline void outw(uint16_t port, uint16_t val)
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{
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asm volatile ( "outw %w0, %w1" : : "a"(val), "Nd"(port) );
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}
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static inline uint16_t inw(uint16_t port)
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{
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uint16_t ret;
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asm volatile ( "inw %w1, %w0" : "=a"(ret) : "Nd"(port) );
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return ret;
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}
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static inline void io_wait(void)
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{
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/* Port 0x80 is used for 'checkpoints' during POST. */
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/* The Linux kernel seems to think it is free for use :-/ */
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asm volatile ( "outb %%al, $0x80" : : "a"(0) );
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}
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#endif
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