feat: setup structure for block devices

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
2021-02-09 22:47:35 +01:00
parent 9440fae968
commit 2ac0da6574
16 changed files with 467 additions and 106 deletions
--- a/kernel/fs/blockdev.c
+++ b/kernel/fs/blockdev.c
@@ -0,0 +1,92 @@
+//
+// Created by rick on 06-02-21.
+//
+
+#include <libc/libc.h>
+#include <libk.h>
+#include <mem/mem.h>
+#include <libc/kprintf.h>
+#include "blockdev.h"
+
+#define MAX_BLOCK_DEVS 64
+#define MAX_BLOCK_DRIVERS 64
+
+int last_block_dev = 0;
+block_device block_devices[MAX_BLOCK_DEVS];
+int last_block_driver = 0;
+block_dev_driver block_dev_drivers[MAX_BLOCK_DRIVERS];
+
+u8 block_dev_register_driver(block_dev_driver *driver) {
+    if (last_block_dev >= MAX_BLOCK_DEVS - 1) {
+        return BLOCK_DEV_REGISTER_DRIVER_FULL;
+    }
+
+    memcpy((u8 *) &block_dev_drivers[last_block_driver++], (const u8 *) driver, sizeof(block_dev_drivers));
+    return BLOCK_DEV_REGISTER_DRIVER_OK;
+}
+
+u8 block_dev_register(block_device *device) {
+    if (last_block_dev >= MAX_BLOCK_DEVS - 1) {
+        return BLOCK_DEV_REGISTER_FULL;
+    }
+
+    memcpy((u8 *) &block_devices[last_block_dev++], (const u8 *) device, sizeof(block_device));
+    return BLOCK_DEV_REGISTER_OK;
+}
+
+void block_dev_free(block_device *device) {
+    //todo
+    k_panics("block dev free not supported");
+}
+
+int block_dev_num_not_scanned() {
+    int not_scanned = 0;
+    for (int i = 0; i < last_block_dev; ++i) {
+        if (block_devices[i].flags.present && !block_devices[i].flags.scanned) not_scanned++;
+    }
+    return not_scanned;
+}
+
+void block_dev_scan() {
+    int c_last_block_dev = last_block_dev;
+    for (int i = 0; i < c_last_block_dev; ++i) {
+        if (block_devices[i].flags.scanned || !block_devices[i].flags.present) continue;
+        u8 *lba0 = malloc(block_devices[i].block_size*4);
+        u8 read_result = block_devices[i].access(&block_devices[i], BLOCK_DEV_DIRECTION_READ, 0, 1, lba0);
+        if (read_result != BLOCK_DEV_ACCESS_OK) {
+            block_devices[i].flags.unreadable = 1;
+            goto _block_dev_scan_free;
+        }
+        for (int j = 0; j < last_block_driver; ++j) {
+            // validate if driver is appropriate at all
+            // don't use a root device driver (i.e. mbr) for a non-root device
+            if (block_dev_drivers[j].flags.root_only && !block_devices[i].flags.root_device) continue;
+
+            // let the driver test the disk
+            u8 driver_result = block_dev_drivers[j].check_device(&block_devices[i], lba0);
+            if (driver_result == BLOCK_DEV_DRIVER_CHECK_OK) {
+                block_devices[i].driver = &block_dev_drivers[j];
+                block_devices[i].flags.driver_installed = 1;
+                break;
+            }
+        }
+        _block_dev_scan_free:
+        free(lba0);
+        block_devices[i].flags.scanned = 1;
+    }
+}
+
+void block_dev_scan_repeat() {
+    while (block_dev_num_not_scanned() > 0) {
+        block_dev_scan();
+    }
+}
+
+void block_dev_print_info() {
+    printf("Block devices:\n");
+    for (int i = 0; i < last_block_dev; ++i) {
+        printf("-%s driver: %s\n",
+               block_devices[i].identifier,
+               block_devices[i].flags.driver_installed ? block_devices[i].driver->name : "n/a");
+    }
+}