imported SEABIOS source tree

[palacios.git] / bios / seabios / src / pic.h

diff --git a/bios/seabios/src/pic.h b/bios/seabios/src/pic.h
new file mode 100644 (file)
index 0000000..c75af3e
--- /dev/null
+++ b/bios/seabios/src/pic.h
@@ -0,0 +1,97 @@
+// Helpers for working with i8259 interrupt controller.
+//
+// Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2002  MandrakeSoft S.A.
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+#ifndef __PIC_H
+#define __PIC_H
+
+#include "ioport.h" // PORT_PIC*
+#include "biosvar.h" // SET_IVT
+
+// PORT_PIC1 bitdefs
+#define PIC1_IRQ0  (1<<0)
+#define PIC1_IRQ1  (1<<1)
+#define PIC1_IRQ2  (1<<2)
+#define PIC1_IRQ5  (1<<5)
+#define PIC1_IRQ6  (1<<6)
+// PORT_PIC2 bitdefs
+#define PIC2_IRQ8  (1<<0)
+#define PIC2_IRQ12 (1<<4)
+#define PIC2_IRQ13 (1<<5)
+#define PIC2_IRQ14 (1<<6)
+
+static inline void
+eoi_pic1(void)
+{
+    // Send eoi (select OCW2 + eoi)
+    outb(0x20, PORT_PIC1_CMD);
+}
+
+static inline void
+eoi_pic2(void)
+{
+    // Send eoi (select OCW2 + eoi)
+    outb(0x20, PORT_PIC2_CMD);
+    eoi_pic1();
+}
+
+static inline void
+unmask_pic1(u8 irq)
+{
+    outb(inb(PORT_PIC1_DATA) & ~irq, PORT_PIC1_DATA);
+}
+
+static inline void
+unmask_pic2(u8 irq)
+{
+    outb(inb(PORT_PIC2_DATA) & ~irq, PORT_PIC2_DATA);
+}
+
+static inline void
+mask_pic1(u8 irq)
+{
+    outb(inb(PORT_PIC1_DATA) | irq, PORT_PIC1_DATA);
+}
+
+static inline void
+mask_pic2(u8 irq)
+{
+    outb(inb(PORT_PIC2_DATA) | irq, PORT_PIC2_DATA);
+}
+
+static inline u8
+get_pic1_isr(void)
+{
+    // 0x0b == select OCW1 + read ISR
+    outb(0x0b, PORT_PIC1_CMD);
+    return inb(PORT_PIC1_CMD);
+}
+
+static inline u8
+get_pic2_isr(void)
+{
+    // 0x0b == select OCW1 + read ISR
+    outb(0x0b, PORT_PIC2_CMD);
+    return inb(PORT_PIC2_CMD);
+}
+
+static inline void
+enable_hwirq(int hwirq, struct segoff_s func)
+{
+    int vector;
+    if (hwirq < 8) {
+        unmask_pic1(1 << hwirq);
+        vector = 0x08 + hwirq;
+    } else {
+        unmask_pic2(1 << (hwirq - 8));
+        vector = 0x70 + hwirq - 8;
+    }
+    SET_IVT(vector, func);
+}
+
+void set_pics(u8 irq0, u8 irq8);
+void pic_setup(void);
+
+#endif // pic.h