From: acevest <zhaoyanbai@126.com>
Date: Thu, 1 Jun 2023 05:48:10 +0000 (+0800)
Subject: 硬盘dma检查目的地址不能跨64K边界
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=92ddc72c90c507c8e0a71f395c7fc40c0edc80f6;p=kernel.git

硬盘dma检查目的地址不能跨64K边界
---

diff --git a/drivers/ata.c b/drivers/ata.c
index 900822d..78b37e8 100644
--- a/drivers/ata.c
+++ b/drivers/ata.c
@@ -119,15 +119,16 @@ void ata_init() {
     // 第49个word的第8个bit位表示是否支持DMA
     // 第83个word的第10个bit位表示是否支持LBA48，为1表示支持。
     // 第100~103个word的八个字节表示user的LBA最大值
-    printk("%04x %04x %d %d\n", identify[49], 1 << 8, identify[49] & (1 << 8), (identify[49] & (1 << 8)) != 0);
+    printd("disk identify %04x %04x %d %d\n", identify[49], 1 << 8, identify[49] & (1 << 8),
+           (identify[49] & (1 << 8)) != 0);
     if ((identify[49] & (1 << 8)) != 0) {
-        printk("support DMA\n");
+        printd("support DMA\n");
     }
 
     if ((identify[83] & (1 << 10)) != 0) {
-        printk("support LBA48\n");
+        printd("support LBA48\n");
         u64 lba = *(u64 *)(identify + 100);
-        printk("hard disk size: %u MB\n", (lba * 512) >> 20);
+        printd("hard disk size: %u MB\n", (lba * 512) >> 20);
     }
 
     // TODO REMOVE
@@ -140,9 +141,9 @@ void ata_init() {
     uint16_t *p = (uint16_t *)mbr_buf;
     for (int i = 0; i < 256; i++) {
         if (i % 12 == 0) {
-            printk("\n[%03d] ", i * 2);
+            printd("\n[%03d] ", i * 2);
         }
-        printk("%04x.", p[i]);
+        printd("%04x.", p[i]);
     }
 }
 
@@ -225,8 +226,14 @@ void ata_dma_read_ext(int dev, uint64_t pos, uint16_t count, void *dest) {
 
     // 配置描述符表
     unsigned long dest_paddr = va2pa(dest);
+
+    // 不能跨64K边界
+    const uint32_t size = count * SECT_SIZE;
+    const uint32_t _64K = 1 << 16;
+    assert(((dest_paddr + size) & _64K) == (dest_paddr & _64K));
+
     ide_pci_controller.prdt[0].phys_addr = dest_paddr;
-    ide_pci_controller.prdt[0].byte_count = SECT_SIZE;
+    ide_pci_controller.prdt[0].byte_count = size;
     ide_pci_controller.prdt[0].reserved = 0;
     ide_pci_controller.prdt[0].eot = 1;
     outl(va2pa(ide_pci_controller.prdt), ide_pci_controller.bus_prdt);
@@ -372,4 +379,4 @@ unsigned int ATA_CHL0_CMD_BASE = 0x1F0;
 unsigned int ATA_CHL1_CMD_BASE = 0x170;
 
 unsigned int ATA_CHL0_CTL_BASE = 0x3F6;
-unsigned int ATA_CHL1_CTL_BASE = 0x376;
\ No newline at end of file
+unsigned int ATA_CHL1_CTL_BASE = 0x376;
diff --git a/drivers/keyboard.c b/drivers/keyboard.c
index dea5b29..4cb4359 100644
--- a/drivers/keyboard.c
+++ b/drivers/keyboard.c
@@ -73,6 +73,9 @@ extern tty_t default_tty;
 extern tty_t monitor_tty;
 extern tty_t debug_tty;
 
+static tty_t *ttys[] = {&default_tty, &monitor_tty, &debug_tty};
+static int tty_no = 0;
+
 void kbd_debug(uint8_t scan_code) {
     static unsigned long kbd_cnt = 0;
     // printl(MPL_KEYBOARD, "keyboard irq: %d scan code %02x", kbd_cnt++, scan_code);
@@ -118,7 +121,8 @@ void kbd_debug(uint8_t scan_code) {
     }
 
     if (scan_code == 0x58) {  // F12
-        current_tty = current_tty != &default_tty ? &default_tty : &monitor_tty;
+        // current_tty = current_tty != &default_tty ? &default_tty : &monitor_tty;
+        current_tty = ttys[++tty_no % (sizeof(ttys) / sizeof(ttys[0]))];
         tty_switch(current_tty);
     }
 
diff --git a/include/system.h b/include/system.h
index 7e920eb..d353804 100644
--- a/include/system.h
+++ b/include/system.h
@@ -268,6 +268,7 @@ extern volatile int reenter;
 
 #define DEFAULT_BOOT_DELAY_TICKS 30
 void boot_delay(int ticks);
+
 #endif
 
 #endif  //_SYSTEM_H
diff --git a/kernel/assert.c b/kernel/assert.c
index 639a202..933c95f 100644
--- a/kernel/assert.c
+++ b/kernel/assert.c
@@ -13,9 +13,10 @@
 #include <printk.h>
 
 void assert_fail(char *exp, char *file, unsigned int line, const char *func) {
+    asm("cli");
     printl(MPL_DEBUG, "%s:%d: %s: Assertion \'%s\' failed.\n", file, line, func, exp);
     printk("%s:%d: %s: Assertion \'%s\' failed.\n", file, line, func, exp);
     while (1) {
-        asm("cli;hlt;");
+        asm("hlt;");
     }
 }
diff --git a/kernel/setup.c b/kernel/setup.c
index 4270530..d27faab 100644
--- a/kernel/setup.c
+++ b/kernel/setup.c
@@ -15,6 +15,7 @@
  */
 #include <bits.h>
 #include <printk.h>
+#include <string.h>
 #include <system.h>
 #include <tty.h>
 
@@ -37,12 +38,11 @@ extern void reboot();
 extern void cnsl_init();
 
 #define VERSION "0.3.1"
-const char *version = "Kernel version " VERSION " @ " BUILDER
+const char *version = "KERNEL v" VERSION " @" BUILDER
                       " ["__DATE__
                       " " __TIME__
                       "]"
-
-                      "\n";
+                      "\n\n";
 
 void setup_kernel() {
     printk("sysenter esp mode: %s\n",
@@ -64,7 +64,8 @@ void setup_kernel() {
     cnsl_init();
     boot_delay(DEFAULT_BOOT_DELAY_TICKS);
 
-    printl(MPL_TITLE, "                                 KERNEL MONITOR");
+    const char *title = "KERNEL MONITOR";
+    printlxy(MPL_TITLE, (80 - strlen(title)) / 2, title);
 
     setup_tasks();
     boot_delay(DEFAULT_BOOT_DELAY_TICKS);
diff --git a/kernel/system.c b/kernel/system.c
index 4bd43a2..124d6f2 100644
--- a/kernel/system.c
+++ b/kernel/system.c
@@ -38,27 +38,6 @@ extern char _idtr[6];
 
 volatile int reenter = -1;
 
-#if 0
-void setup_gdt_before_pageing() {
-    pDesc pdesc;
-    // change to new gdt.
-    asm volatile("sgdt _gdtr");
-    Desc *_gdt = (Desc *)va2pa(gdt);
-    memcpy((void *)_gdt, (void *)(_gdtr + 2), *((uint16_t *)(_gdtr + 0)));
-
-    //
-    *((uint16_t *)(_gdtr + 0)) = NGDT * sizeof(Desc);
-    *((uint32_t *)(_gdtr + 2)) = (uint32_t)_gdt;
-    asm volatile("sgdt _gdtr");
-    memcpy(_gdt + INDEX_UCODE, _gdt + INDEX_KCODE, sizeof(Desc));
-    memcpy(_gdt + INDEX_UDATA, _gdt + INDEX_KDATA, sizeof(Desc));
-    pdesc = _gdt + INDEX_UCODE;
-    pdesc->seg.DPL = 3;
-    pdesc = _gdt + INDEX_UDATA;
-    pdesc->seg.DPL = 3;
-}
-#endif
-
 void setup_gdt() {
     pDesc pdesc;
     // change to new gdt.
diff --git a/kernel/task_root.c b/kernel/task_root.c
index 5721beb..898196d 100644
--- a/kernel/task_root.c
+++ b/kernel/task_root.c
@@ -137,7 +137,7 @@ void taskB_entry() {
 }
 
 void taskC_entry() {
-    current->priority = 19;
+    current->priority = 17;
 
     while (1) {
         sysc_wait(1);
diff --git a/kernel/tty.c b/kernel/tty.c
index 8c0a289..21976e0 100644
--- a/kernel/tty.c
+++ b/kernel/tty.c
@@ -84,10 +84,6 @@ void init_tty(tty_t *tty, const char *name, unsigned long base) {
 void init_ttys() {
     assert(irq_disabled());
 
-    // 先备份default_tty在分页前用到的xpos, ypos
-    unsigned int xpos = default_tty.xpos;
-    unsigned int ypos = default_tty.ypos;
-
     init_tty(&default_tty, "tty.default", VADDR + 0 * TTY_VRAM_SIZE);
     init_tty(&monitor_tty, "tty.monitor", VADDR + 1 * TTY_VRAM_SIZE);
     init_tty(&debug_tty, "tty.debug", VADDR + 7 * TTY_VRAM_SIZE);