From: acevest <zhaoyanbai@126.com>
Date: Sun, 21 Nov 2021 14:39:13 +0000 (+0800)
Subject: 加入按扇区读硬盘功能
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=9515e283bc31c0189be24ecef7669b4ed2bb86b9;p=kernel.git

加入按扇区读硬盘功能
---

diff --git a/drivers/ata.c b/drivers/ata.c
index 8ee4e34..6296939 100644
--- a/drivers/ata.c
+++ b/drivers/ata.c
@@ -50,14 +50,7 @@ void ata_read_data(int dev, int sect_cnt, void *dst) { insl(REG_DATA(dev), dst,
 void ata_read_identify(int dev) {
     outb(0x00, REG_CTL(dev));
     outb(0x00 | ((dev & 0x01) << 4), REG_DEVICE(dev));  // 根据文档P113，这里不用指定bit5, bit7，直接指示DRIVE就行
-
-    unsigned long flags;
-    irq_save(flags);
-
     outb(ATA_CMD_IDENTIFY, REG_CMD(dev));
-    wait_on_ide();
-
-    irq_restore(flags);
 }
 
 void ata_init() {
@@ -83,6 +76,22 @@ void ata_init() {
         u64 lba = *(u64 *)(identify + 100);
         printk("hard disk size: %u MB\n", (lba * 512) >> 20);
     }
+
+    // TODO REMOVE
+    mbr_buf = kmalloc(SECT_SIZE, 0);
+    r.command = DISK_REQ_READ;
+    r.pos = 1;
+    r.count = 1;
+    r.buf = mbr_buf;
+    send_disk_request(&r);
+
+    uint16_t *p = (uint16_t *)mbr_buf;
+    for (int i = 0; i < 256; i++) {
+        if (i % 12 == 0) {
+            printk("\n[%03d] ", i * 2);
+        }
+        printk("%04x ", p[i]);
+    }
 }
 
 void ata_read_identify_old(int dev) {  // 这里所用的dev是逻辑编号 ATA0、ATA1下的Master、Salve的dev分别为0,1,2,3
diff --git a/kernel/semaphore.c b/kernel/semaphore.c
index 278d339..857dca1 100644
--- a/kernel/semaphore.c
+++ b/kernel/semaphore.c
@@ -67,10 +67,8 @@ void up(semaphore_t *s) {
 
     // if (likely(list_empty(&s->wait_list))) {
     if (list_empty(&s->wait_list)) {
-        printk("++++++\n");
         s->cnt++;
     } else {
-        printk("upupupuppupupup\n");
         __up(s);
     }
 
diff --git a/kernel/task_disk.c b/kernel/task_disk.c
index 3d29af2..f6d8f4c 100644
--- a/kernel/task_disk.c
+++ b/kernel/task_disk.c
@@ -103,7 +103,12 @@ void disk_task_entry() {
             void ata_read_identify(int dev);
             ata_read_identify(dev);
             break;
-
+        case DISK_REQ_READ:
+            assert(r->count > 0);
+            assert(r->buf != NULL);
+            void ata_dma_read_ext(int dev, uint64_t pos, uint16_t count, void *dest);
+            ata_dma_read_ext(dev, r->pos, r->count, r->buf);
+            break;
         default:
             break;
         }