Project restructure (no new code added)

Moved all header files into include/ and removed their C counterparts -> code inside .h files Also added a kernel.ld linker file since we don't have many code files in src/ now, i removed src/kernel/ only real code change is that i moved memcopy() and memset() into string.h from system.h
2024-04-14 18:27:53 +02:00
parent 60cca470b4
commit 90ac82eebc
25 changed files with 204 additions and 273 deletions
@@ -0,0 +1,63 @@
+#ifndef DRIVE_H
+#define DRIVE_H
+
+#include "stdint.h"
+#include "system.h"
+
+#define PIO_PORT 0x1f0
+#define READ_COMMAND 0x20
+#define WRITE_COMMAND 0x30
+#define CACHE_FLUSH 0xE7
+
+extern uint8_t driveNum;
+
+void diskRead(uint32_t lbaAddress, uint8_t sectorCount, char* dst) {
+    outb(PIO_PORT + 6, ((lbaAddress >> 24) & 0x0f) | 0xe0); // 6 - Use LBA; 4 - Drive number; 3-0 - Highest lba address nibble
+    outb(PIO_PORT + 2, sectorCount); // Sector count register
+    outb(PIO_PORT + 3, (uint8_t)(lbaAddress)); // Lowest lba address byte
+    outb(PIO_PORT + 4, (uint8_t)(lbaAddress >> 8)); // Middle lba address byte
+    outb(PIO_PORT + 5, (uint8_t)(lbaAddress >> 16)); // High lba address byte
+    outb(PIO_PORT + 7, READ_COMMAND); // Command register
+    
+    uint16_t* address = (uint16_t*)dst;
+
+    for (uint8_t i = sectorCount; i > 0; i--) {
+        while (inb(PIO_PORT + 7) & (1 << 7)); // Poll status register untill BSY bit is clear
+
+        for (size_t j = 0; j < 256; j++) {
+            *address++ = inw(PIO_PORT); // Read 256 words (512 Bytes = 1 Sector)
+        }
+
+        for (uint8_t delay = 0; delay < 4; delay++) { // 400ns delay
+            inb(0x3f6); // Alternate status register
+        }
+    }
+}
+
+void diskWrite(uint32_t lbaAddress, uint8_t sectorCount, char* src) {
+    outb(PIO_PORT + 6, ((lbaAddress >> 24) & 0x0f) | 0xe0); // 6 - Use LBA; 4 - Drive number; 3-0 - Highest lba address nibble
+    outb(PIO_PORT + 2, sectorCount); // Sector count register
+    outb(PIO_PORT + 3, (uint8_t)(lbaAddress)); // Lowest lba address byte
+    outb(PIO_PORT + 4, (uint8_t)(lbaAddress >> 8)); // Middle lba address byte
+    outb(PIO_PORT + 5, (uint8_t)(lbaAddress >> 16)); // High lba address byte
+    outb(PIO_PORT + 7, WRITE_COMMAND); // Command register
+    
+    uint16_t* address = (uint16_t*)src;
+
+    for (uint8_t i = sectorCount; i > 0; i--) {
+        while (inb(PIO_PORT + 7) & (1 << 7)); // Poll status register untill BSY bit is clear
+
+        for (size_t j = 0; j < 256; j++) {
+            outw(PIO_PORT, *address++); // Write 256 words (512 Bytes = 1 Sector)
+        }
+
+        for (uint8_t delay = 0; delay < 4; delay++) { // 400ns delay
+            inb(0x3f6); // Alternate status register
+        }
+    }
+    
+    outb(PIO_PORT + 7, CACHE_FLUSH); // Cache flush
+    while (inb(PIO_PORT + 7) & (1 << 7)); // Poll status register untill BSY bit is clear
+}
+
+#endif