Rick Rongen
2ac0da6574
added ide block device added mbr block device driver started fat block device driver reordered boot start timer before pci/ide/etc. enable interrupts earlier fixed exception from ide controller cleanup code more printfs
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
//
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// Created by rick on 06-02-21.
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//
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#include <libc/libc.h>
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#include <libk.h>
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#include <mem/mem.h>
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#include <libc/kprintf.h>
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#include "blockdev.h"
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#define MAX_BLOCK_DEVS 64
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#define MAX_BLOCK_DRIVERS 64
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int last_block_dev = 0;
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block_device block_devices[MAX_BLOCK_DEVS];
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int last_block_driver = 0;
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block_dev_driver block_dev_drivers[MAX_BLOCK_DRIVERS];
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u8 block_dev_register_driver(block_dev_driver *driver) {
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if (last_block_dev >= MAX_BLOCK_DEVS - 1) {
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return BLOCK_DEV_REGISTER_DRIVER_FULL;
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}
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memcpy((u8 *) &block_dev_drivers[last_block_driver++], (const u8 *) driver, sizeof(block_dev_drivers));
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return BLOCK_DEV_REGISTER_DRIVER_OK;
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}
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u8 block_dev_register(block_device *device) {
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if (last_block_dev >= MAX_BLOCK_DEVS - 1) {
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return BLOCK_DEV_REGISTER_FULL;
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}
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memcpy((u8 *) &block_devices[last_block_dev++], (const u8 *) device, sizeof(block_device));
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return BLOCK_DEV_REGISTER_OK;
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}
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void block_dev_free(block_device *device) {
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//todo
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k_panics("block dev free not supported");
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}
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int block_dev_num_not_scanned() {
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int not_scanned = 0;
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for (int i = 0; i < last_block_dev; ++i) {
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if (block_devices[i].flags.present && !block_devices[i].flags.scanned) not_scanned++;
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}
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return not_scanned;
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}
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void block_dev_scan() {
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int c_last_block_dev = last_block_dev;
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for (int i = 0; i < c_last_block_dev; ++i) {
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if (block_devices[i].flags.scanned || !block_devices[i].flags.present) continue;
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u8 *lba0 = malloc(block_devices[i].block_size*4);
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u8 read_result = block_devices[i].access(&block_devices[i], BLOCK_DEV_DIRECTION_READ, 0, 1, lba0);
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if (read_result != BLOCK_DEV_ACCESS_OK) {
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block_devices[i].flags.unreadable = 1;
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goto _block_dev_scan_free;
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}
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for (int j = 0; j < last_block_driver; ++j) {
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// validate if driver is appropriate at all
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// don't use a root device driver (i.e. mbr) for a non-root device
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if (block_dev_drivers[j].flags.root_only && !block_devices[i].flags.root_device) continue;
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// let the driver test the disk
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u8 driver_result = block_dev_drivers[j].check_device(&block_devices[i], lba0);
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if (driver_result == BLOCK_DEV_DRIVER_CHECK_OK) {
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block_devices[i].driver = &block_dev_drivers[j];
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block_devices[i].flags.driver_installed = 1;
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break;
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}
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}
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_block_dev_scan_free:
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free(lba0);
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block_devices[i].flags.scanned = 1;
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}
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}
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void block_dev_scan_repeat() {
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while (block_dev_num_not_scanned() > 0) {
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block_dev_scan();
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}
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}
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void block_dev_print_info() {
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printf("Block devices:\n");
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for (int i = 0; i < last_block_dev; ++i) {
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printf("-%s driver: %s\n",
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block_devices[i].identifier,
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block_devices[i].flags.driver_installed ? block_devices[i].driver->name : "n/a");
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}
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} |