1 files changed, 67 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/arch/x86/core/pic8259.c b/qemu/roms/ipxe/src/arch/x86/core/pic8259.c
new file mode 100644
index 000000000..0a9ea2e03
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/x86/core/pic8259.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/io.h>
+#include <pic8259.h>
+
+/** @file
+ *
+ * Minimal support for the 8259 Programmable Interrupt Controller
+ *
+ */
+
+/**
+ * Send non-specific EOI(s)
+ *
+ * @v irq		IRQ number
+ *
+ * This seems to be inherently unsafe.
+ */
+static inline void send_nonspecific_eoi ( unsigned int irq ) {
+	DBG ( "Sending non-specific EOI for IRQ %d\n", irq );
+	if ( irq >= IRQ_PIC_CUTOFF ) {
+		outb ( ICR_EOI_NON_SPECIFIC, PIC2_ICR );
+	}		
+	outb ( ICR_EOI_NON_SPECIFIC, PIC1_ICR );
+}
+
+/**
+ * Send specific EOI(s)
+ *
+ * @v irq		IRQ number
+ */
+static inline void send_specific_eoi ( unsigned int irq ) {
+	DBG ( "Sending specific EOI for IRQ %d\n", irq );
+	if ( irq >= IRQ_PIC_CUTOFF ) {
+		outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( CHAINED_IRQ ) ),
+		       ICR_REG ( CHAINED_IRQ ) );
+	}
+	outb ( ( ICR_EOI_SPECIFIC | ICR_VALUE ( irq ) ), ICR_REG ( irq ) );
+}
+
+/**
+ * Send End-Of-Interrupt to the PIC
+ *
+ * @v irq		IRQ number
+ */
+void send_eoi ( unsigned int irq ) {
+	send_specific_eoi ( irq );
+}