HDA: Reset now works in real hardware

kernel/include/drv/audio/hda.h

@@ -4,4 +4,5 @@
 
 #pragma once
 
-void hda_init();
+void hda_init();
+void hda_reset();

kernel/src/drv/audio/hda.c

@@ -6,6 +6,7 @@
 #include "drv/audio/hda.h"
 #include "io/ports.h"
 #include "io/tty.h"
+#include "mem/pmm.h"
 
 uint8_t hda_bus = 0,
         hda_slot = 0,
@@ -16,6 +17,13 @@ uint16_t hda_vendor = 0,
 
 uint32_t hda_addr = 0;
 
+#define WRITE32(reg, value) *(volatile uint32_t*)(hda_addr + (reg)) = (value)
+#define READ32(reg) (*(volatile uint32_t*)(hda_addr + (reg)))
+#define WRITE16(reg, value) *(volatile uint16_t*)(hda_addr + (reg)) = (value)
+#define READ16(reg) (*(volatile uint16_t*)(hda_addr + (reg)))
+#define WRITE8(reg, value) *(volatile uint8_t*)(hda_addr + (reg)) = (value)
+#define READ8(reg) (*(volatile uint8_t*)(hda_addr + (reg)))
+
 void hda_init() {
     pci_find_device_by_class_and_subclass(4, 3, &hda_vendor, &hda_device, &hda_bus, &hda_slot, &hda_func);
 
@@ -28,5 +36,32 @@ void hda_init() {
     hda_addr = pci_read32(hda_bus, hda_slot, hda_func, 0x10) & ~0x10;
 
     qemu_ok("HDA address: %x", hda_addr);
-    tty_printf("HDA address: %x", hda_addr);
+    tty_printf("HDA address: %x\n", hda_addr);
+
+    map_pages(
+            get_kernel_page_directory(),
+            hda_addr,
+            hda_addr,
+            PAGE_SIZE,
+            PAGE_WRITEABLE | PAGE_CACHE_DISABLE // PAGE_PRESENT is set automatically
+    );
+
+    hda_reset();
+
+    tty_printf("HDA RESET OKAY!\n");
+}
+
+void hda_reset() {
+    if(!hda_vendor)
+        return;
+
+    WRITE32(0x08, 0);
+
+    while((READ32(0x08) & 1) != 0);
+
+    WRITE32(0x8, 1);
+
+    while ((READ32(0x08) & 1) != 1);
+
+    qemu_ok("Reset ok!");
 }