sb16: start adding sb16 driver

src/drivers/sb16.c

@@ -0,0 +1,83 @@
+#include "../include/utils.h"
+#include "../include/paging.h"
+#include "../include/liballoc.h"
+
+#define DSP_RESET 0x226
+#define DSP_READ 0x22A
+#define DSP_WRITE 0x22C
+#define MIXER 0x224
+#define MIXER_DATA 0x225
+
+int sb16_dsp_reset()
+{
+    outb(DSP_RESET, 1);
+
+    //dirty hack to wait 3 microseconds
+    for(int i = 0; i < 3*100; i++)
+    {
+        inb(0x1FC);
+    }
+
+    outb(DSP_RESET, 0);
+
+    return inb(DSP_READ);
+}
+
+int sb16_get_irq()
+{
+    outb(MIXER, 0x80);
+
+    int irq_code = inb(MIXER_DATA);
+    int irq = 0;
+
+    switch(irq_code)
+    {
+        case 0x01:
+            irq = 2;
+            break;
+        case 0x02:
+            irq = 5;
+            break;
+        case 0x04:
+            irq = 7;
+            break;
+        case 0x08:
+            irq = 10;
+            break;
+    }
+
+    return irq;
+}
+
+void* sb16_allocate_buf()
+{
+    const size_t size = 64*1024;//64 KB
+
+    void* buffer = malloc(size);
+
+    return get_physaddr(buffer);
+}
+
+void sb16_get_version(int* major, int* minor)
+{
+    outb(DSP_WRITE, 0xE1);//0xE1 is get version
+
+    *major = inb(DSP_READ);
+    *minor = inb(DSP_READ);
+}
+
+void sb16_init()
+{
+    int status = sb16_dsp_reset();
+	printf("sb16 status: 0x%X\n", status);
+	int sb16_irq = sb16_get_irq();
+	printf("sb16 irq: 0x%X\n", sb16_irq);
+	void* sb16_buffer = sb16_allocate_buf();
+	printf("sb16 buffer: 0x%X\n", sb16_buffer);
+
+    int major, minor = 0;
+    sb16_get_version(&major, &minor);
+    printf("sb16 version: %X.%X\n", major, minor);
+
+    outb(DSP_WRITE, 0xD1);//enable speaker
+}

src/kernel/kernel.c

@@ -18,6 +18,8 @@
 #include "../include/apic.h"
 #include "../include/keyboard.h"
 
+#include "../include/sb16.h"
+
 #include <stdint.h>
 
 void kmain(unsigned int magic, unsigned int info)
@@ -139,7 +141,9 @@ void kmain(unsigned int magic, unsigned int info)
 
 	follow_path("/katau/ksh.", &file, &dir);
 
-	exec_from_file(&file, &dir);
+	sb16_init();
+
+	//exec_from_file(&file, &dir);
 
 	while(1)
 	{