amd64: barely boot into kernel code

1 files changed, 0 insertions, 151 deletions

diff --git a/src/kernel/arch/i386/ata.c b/src/kernel/arch/i386/ata.c
deleted file mode 100644
index 56344e4..0000000
--- a/src/kernel/arch/i386/ata.c
+++ /dev/null
@@ -1,151 +0,0 @@
-#include <kernel/arch/i386/ata.h>
-#include <kernel/arch/i386/port_io.h>
-#include <kernel/panic.h>
-#include <stdbool.h>
-
-static struct {
-	enum {
-		DEV_UNKNOWN,
-		DEV_PATA,
-		DEV_PATAPI,
-	} type;
-	uint32_t sectors;
-} ata_drives[4];
-
-enum {
-	DATA   = 0,
-	FEAT   = 1,
-	SCNT   = 2,
-	LBAlo  = 3,
-	LBAmid = 4,
-	LBAhi  = 5,
-	DRV    = 6,
-	CMD    = 7,
-	STATUS = 7,
-
-	/* note: the OSDev wiki uses a different base port for the control port
-	 *       however i can just use this offset and stuff will just work tm */
-	CTRL   = 0x206,
-}; // offsets
-
-// get I/O port base for drive
-static uint16_t ata_iobase(int drive) {
-	bool secondary = drive&2;
-	return secondary ? 0x170 : 0x1F0;
-}
-
-static void ata_400ns(void) {
-	uint16_t base = ata_iobase(0); // doesn't matter
-	for (int i = 0; i < 4; i++)
-		port_in8(base + STATUS);
-}
-
-static void ata_driveselect(int drive, int block) {
-	uint8_t v = 0xE0;
-	if (drive&1) // slave?
-		v |= 0x10; // set drive number bit
-	// TODO account for block
-	port_out8(ata_iobase(drive) + DRV, v);
-}
-
-static void ata_softreset(int drive) {
-	uint16_t iobase = ata_iobase(drive);
-	port_out8(iobase + CTRL, 4);
-	port_out8(iobase + CTRL, 0);
-	ata_400ns();
-
-	uint16_t timeout = 10000;
-	while (--timeout) { // TODO separate polling function
-		uint8_t v = port_in8(iobase + STATUS);
-		if (v & 0x80) continue; // still BSY, continue
-		if (v & 0x40) break; // RDY, break
-		// TODO check for ERR
-	}
-}
-
-static void ata_detecttype(int drive) {
-	ata_softreset(drive);
-	ata_driveselect(drive, 0);
-	ata_400ns();
-	switch (port_in8(ata_iobase(drive) + LBAmid)) {
-		case 0:
-			ata_drives[drive].type = DEV_PATA;
-			break;
-		case 0x14:
-			ata_drives[drive].type = DEV_PATAPI;
-			break;
-		default:
-			ata_drives[drive].type = DEV_UNKNOWN;
-			break;
-	}
-}
-
-static bool ata_identify(int drive) {
-	uint16_t iobase = ata_iobase(drive);
-	uint16_t data[256];
-	uint8_t v;
-
-	ata_driveselect(drive, 0);
-	for (int i = 2; i < 6; i++)
-		port_out8(iobase + i, 0);
-	switch (ata_drives[drive].type) {
-		case DEV_PATA:
-			port_out8(iobase + CMD, 0xEC); // IDENTIFY
-			break;
-		case DEV_PATAPI:
-			port_out8(iobase + CMD, 0xA1); // IDENTIFY PACKET DEVICE
-			break;
-		default: panic_invalid_state();
-	}
-
-	v = port_in8(iobase + STATUS);
-	if (v == 0) return false; // nonexistent drive
-	while (port_in8(iobase + STATUS) & 0x80);
-
-	/* pool until bit 3 (DRQ) or 0 (ERR) is set */
-	while (!((v = port_in8(iobase + STATUS) & 0x9)));
-	if (v & 1) return false; /* ERR was set, bail */
-
-	for (int i = 0; i < 256; i++)
-		data[i] = port_in16(iobase);
-	ata_drives[drive].sectors = data[60] | (data[61] << 16);
-	return true;
-}
-
-void ata_init(void) {
-	for (int i = 0; i < 4; i++) {
-		ata_detecttype(i);
-		if (ata_drives[i].type == DEV_PATA)
-			ata_identify(i);
-	}
-}
-
-bool ata_available(int drive) {
-	return ata_drives[drive].type != DEV_UNKNOWN;
-}
-
-int ata_read(int drive, uint32_t lba, void *buf) {
-	assert(ata_drives[drive].type == DEV_PATA);
-	int iobase = ata_iobase(drive);
-
-	ata_driveselect(drive, lba);
-	port_out8(iobase + FEAT, 0); // supposedly pointless
-	port_out8(iobase + SCNT, 1); // sector count
-	port_out8(iobase + LBAlo, lba);
-	port_out8(iobase + LBAmid, lba >> 8);
-	port_out8(iobase + LBAhi, lba >> 16);
-	port_out8(iobase + CMD, 0x20); // READ SECTORS
-
-	for (;;) { // TODO separate polling function
-		uint8_t v = port_in8(iobase + STATUS);
-		if (v & 0x80) continue; // still BSY, continue
-		if (v & 0x40) break; // RDY, break
-		// TODO check for ERR
-	}
-
-	uint16_t *b = buf;
-	for (int i = 0; i < 256; i++)
-		b[i] = port_in16(iobase);
-
-	return 512;
-}