Add IDE ATA read using PIO/DMA

include/sys/amd64/hw/ide/ata.h

@@ -22,6 +22,9 @@
 
 #define ATA_CMD_IDENTIFY        0xEC
 #define ATA_CMD_IDENTIFY_PACKET 0xA1
+#define ATA_CMD_READ_PIO        0x20
+#define ATA_CMD_READ_PIO_EX     0x24
+#define ATA_CMD_READ_DMA        0xC8
 #define ATA_CMD_READ_DMA_EX     0x25
 
 #define ATA_SR_BUSY             (1 << 7)

include/sys/amd64/hw/ide/ide.h

@@ -6,6 +6,12 @@
 #define IDE_DEFAULT_BAR2        0x170
 #define IDE_DEFAULT_BAR3        0x376
 
+struct ide_prdt_entry {
+    uint32_t addr;
+    uint16_t size;
+    uint16_t attr;
+} __attribute__((packed));
+
 struct ide_controller {
     uint16_t bar0;      // Primary channel
     uint16_t bar1;      // Primary control port
@@ -14,6 +20,8 @@ struct ide_controller {
     uint16_t bar4;      // Bus master control
     uint8_t irq0, irq1;
 
+    uintptr_t dma_page;
+
     struct ide_channel {
         uint16_t base;
         uint16_t ctrl;
@@ -28,6 +36,7 @@ struct ide_controller {
         // 2        1 if slave device
         // 3        1 if device is ATAPI (ATA otherwise)
         // ...
+        struct ide_controller *ide;
         uint8_t attr;
         uint16_t signature;
         uint16_t caps;
@@ -37,4 +46,7 @@ struct ide_controller {
     } devices[4];
 };
 
+int ide_ata_read_pio(struct ide_device *dev, void *buf, size_t nsect, uint64_t lba);
+int ide_ata_read_dma(struct ide_device *dev, void *buf, size_t nsect, uint64_t lba);
+
 void ide_init(struct ide_controller *ide);

include/sys/string.h

@@ -5,6 +5,8 @@
 #pragma once
 #include "sys/types.h"
 
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+
 void *memcpy(void *restrict dst, const void *restrict src, size_t cnt);
 void *memmove(void *dst, const void *src, size_t cnt);
 void *memset(void *dst, int v, size_t count);