[hack] IDE disk reads to HDB

Run read-disk from the kernel shell to read the first sector of -hdb,
run write-disk to write the sequence "DCDCDCDCDC..." to the first
sector.

kernel/core/shell.c

@@ -21,6 +21,7 @@
 #include <system.h>
 #include <fs.h>
 #include <multiboot.h>
+#include <ata.h>
 
 void
 start_shell() {
@@ -208,6 +209,54 @@ start_shell() {
 				free(allocs);
 				free(sizes);
 				kprintf("Testing complete.\n");
+			} else if (!strcmp(cmd, "read-disk")) {
+				__asm__ __volatile__ ("cli");
+				char buf[512];
+				uint32_t lba = 0x0;
+				uint16_t bus = 0x1F0;
+				outportb(bus + 0x01, 0x00);
+				outportb(bus + 0x03, lba & 0xff);
+				outportb(bus + 0x04, (lba >> 8) & 0xff);
+				outportb(bus + 0x05, (lba >> 16)& 0xff);
+				outportb(bus + 0x06, 0xf0 | (lba >> 24 & 0xf));
+				outportb(bus + 0x07, ATA_CMD_READ_PIO);
+				outportb(bus + 0x02, 1);
+				uint8_t status = 0;
+				while ((status = inportb(bus + 0x07)) & 0x80) {
+				}
+				for (volatile int i = 0; i < 512; i += 2)
+				{
+					uint16_t s = inports(0x1f0);
+					buf[i] = s & 0xFF;
+					buf[i+1] = (s & 0xFF00) >> 8;
+				}
+				outportb(0x177, 0xe7);
+				for (uint16_t i = 0; i < 512; ++i) {
+					kprintf("%c", (int)(buf[i] & 0xFF));
+				}
+				__asm__ __volatile__ ("sti");
+			} else if (!strcmp(cmd, "write-disk")) {
+				__asm__ __volatile__ ("cli");
+				uint32_t lba = 0x0;
+				uint16_t bus = 0x1F0;
+				outportb(bus + 0x01, 0x00);
+				outportb(bus + 0x03, lba & 0xff);
+				outportb(bus + 0x04, (lba >> 8) & 0xff);
+				outportb(bus + 0x05, (lba >> 16)& 0xff);
+				outportb(bus + 0x06, 0xf0 | (lba >> 24 & 0xf));
+				outportb(bus + 0x07, ATA_CMD_WRITE_PIO);
+				uint8_t status = 0;
+				while ((status = inportb(bus + 0x07)) & 0x80) {
+				}
+				for (volatile int i = 0; i < 512; i+=2)
+				{
+					outportb(bus + 0x02, 0);
+					outports(bus, 0x4344);
+				}
+				outportb(bus + 0x07, ATA_CMD_CACHE_FLUSH);
+				outportb(bus + 0x02, 0);
+				outportb(0x177, 0xe7);
+				__asm__ __volatile__ ("sti");
 			} else {
 				/* Alright, here we go */
 				char * filename = malloc(sizeof(char) * 1024);

kernel/include/ata.h

@@ -0,0 +1,107 @@
+/* vim: noexpandtab tabstop=4 shiftwidth=4
+ *
+ * Values for ATA / PATA devices
+ */
+
+#ifndef ATA_H
+#define ATA_H
+
+#define ATA_SR_BSY     0x80
+#define ATA_SR_DRDY    0x40
+#define ATA_SR_DF      0x20
+#define ATA_SR_DSC     0x10
+#define ATA_SR_DRQ     0x08
+#define ATA_SR_CORR    0x04
+#define ATA_SR_IDX     0x02
+#define ATA_SR_ERR     0x01
+
+#define ATA_ER_BBK      0x80
+#define ATA_ER_UNC      0x40
+#define ATA_ER_MC       0x20
+#define ATA_ER_IDNF     0x10
+#define ATA_ER_MCR      0x08
+#define ATA_ER_ABRT     0x04
+#define ATA_ER_TK0NF    0x02
+#define ATA_ER_AMNF     0x01
+
+#define ATA_CMD_READ_PIO          0x20
+#define ATA_CMD_READ_PIO_EXT      0x24
+#define ATA_CMD_READ_DMA          0xC8
+#define ATA_CMD_READ_DMA_EXT      0x25
+#define ATA_CMD_WRITE_PIO         0x30
+#define ATA_CMD_WRITE_PIO_EXT     0x34
+#define ATA_CMD_WRITE_DMA         0xCA
+#define ATA_CMD_WRITE_DMA_EXT     0x35
+#define ATA_CMD_CACHE_FLUSH       0xE7
+#define ATA_CMD_CACHE_FLUSH_EXT   0xEA
+#define ATA_CMD_PACKET            0xA0
+#define ATA_CMD_IDENTIFY_PACKET   0xA1
+#define ATA_CMD_IDENTIFY          0xEC
+
+#define ATAPI_CMD_READ       0xA8
+#define ATAPI_CMD_EJECT      0x1B
+
+#define ATA_IDENT_DEVICETYPE   0
+#define ATA_IDENT_CYLINDERS    2
+#define ATA_IDENT_HEADS        6
+#define ATA_IDENT_SECTORS      12
+#define ATA_IDENT_SERIAL       20
+#define ATA_IDENT_MODEL        54
+#define ATA_IDENT_CAPABILITIES 98
+#define ATA_IDENT_FIELDVALID   106
+#define ATA_IDENT_MAX_LBA      120
+#define ATA_IDENT_COMMANDSETS  164
+#define ATA_IDENT_MAX_LBA_EXT  200
+
+#define IDE_ATA        0x00
+#define IDE_ATAPI      0x01
+ 
+#define ATA_MASTER     0x00
+#define ATA_SLAVE      0x01
+
+#define ATA_REG_DATA       0x00
+#define ATA_REG_ERROR      0x01
+#define ATA_REG_FEATURES   0x01
+#define ATA_REG_SECCOUNT0  0x02
+#define ATA_REG_LBA0       0x03
+#define ATA_REG_LBA1       0x04
+#define ATA_REG_LBA2       0x05
+#define ATA_REG_HDDEVSEL   0x06
+#define ATA_REG_COMMAND    0x07
+#define ATA_REG_STATUS     0x07
+#define ATA_REG_SECCOUNT1  0x08
+#define ATA_REG_LBA3       0x09
+#define ATA_REG_LBA4       0x0A
+#define ATA_REG_LBA5       0x0B
+#define ATA_REG_CONTROL    0x0C
+#define ATA_REG_ALTSTATUS  0x0C
+#define ATA_REG_DEVADDRESS 0x0D
+
+// Channels:
+#define ATA_PRIMARY      0x00
+#define ATA_SECONDARY    0x01
+
+// Directions:
+#define ATA_READ      0x00
+#define ATA_WRITE     0x01
+
+typedef struct {
+	uint16_t base;
+	uint16_t ctrl;
+	uint16_t bmide;
+	uint16_t nien;
+} ide_channel_regs_t;
+
+typedef struct {
+	uint8_t  reserved;
+	uint8_t  channel;
+	uint8_t  drive;
+	uint16_t type;
+	uint16_t signature;
+	uint16_t capabilities;
+	uint32_t command_sets;
+	uint32_t size;
+	uint8_t  model[41];
+} ide_device_t;
+
+#endif