X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Farch%2Fx86%2Flib%2Fpcat_interrupts.c;fp=qemu%2Froms%2Fu-boot%2Farch%2Fx86%2Flib%2Fpcat_interrupts.c;h=4c86f7fc6a85ae2910c8b6d1e8f3b047fb42fbe5;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/roms/u-boot/arch/x86/lib/pcat_interrupts.c b/qemu/roms/u-boot/arch/x86/lib/pcat_interrupts.c
new file mode 100644
index 000000000..4c86f7fc6
--- /dev/null
+++ b/qemu/roms/u-boot/arch/x86/lib/pcat_interrupts.c
@@ -0,0 +1,116 @@
+/*
+ * (C) Copyright 2009
+ * Graeme Russ, <graeme.russ@gmail.com>
+ *
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * This file provides the interrupt handling functionality for systems
+ * based on the standard PC/AT architecture using two cascaded i8259
+ * Programmable Interrupt Controllers.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/i8259.h>
+#include <asm/ibmpc.h>
+#include <asm/interrupt.h>
+
+#if CONFIG_SYS_NUM_IRQS != 16
+#error "CONFIG_SYS_NUM_IRQS must equal 16 if CONFIG_SYS_NUM_IRQS is defined"
+#endif
+
+int interrupt_init(void)
+{
+	u8 i;
+
+	disable_interrupts();
+
+	/* Mask all interrupts */
+	outb(0xff, MASTER_PIC + IMR);
+	outb(0xff, SLAVE_PIC + IMR);
+
+	/* Master PIC */
+	/* Place master PIC interrupts at INT20 */
+	/* ICW3, One slave PIC is present */
+	outb(ICW1_SEL|ICW1_EICW4, MASTER_PIC + ICW1);
+	outb(0x20, MASTER_PIC + ICW2);
+	outb(IR2, MASTER_PIC + ICW3);
+	outb(ICW4_PM, MASTER_PIC + ICW4);
+
+	for (i = 0; i < 8; i++)
+		outb(OCW2_SEOI | i, MASTER_PIC + OCW2);
+
+	/* Slave PIC */
+	/* Place slave PIC interrupts at INT28 */
+	/* Slave ID */
+	outb(ICW1_SEL|ICW1_EICW4, SLAVE_PIC + ICW1);
+	outb(0x28, SLAVE_PIC + ICW2);
+	outb(0x02, SLAVE_PIC + ICW3);
+	outb(ICW4_PM, SLAVE_PIC + ICW4);
+
+	for (i = 0; i < 8; i++)
+		outb(OCW2_SEOI | i, SLAVE_PIC + OCW2);
+
+	/*
+	 * Enable cascaded interrupts by unmasking the cascade IRQ pin of
+	 * the master PIC
+	 */
+	unmask_irq(2);
+
+	enable_interrupts();
+
+	return 0;
+}
+
+void mask_irq(int irq)
+{
+	int imr_port;
+
+	if (irq >= CONFIG_SYS_NUM_IRQS)
+		return;
+
+	if (irq > 7)
+		imr_port = SLAVE_PIC + IMR;
+	else
+		imr_port = MASTER_PIC + IMR;
+
+	outb(inb(imr_port) | (1 << (irq & 7)), imr_port);
+}
+
+void unmask_irq(int irq)
+{
+	int imr_port;
+
+	if (irq >= CONFIG_SYS_NUM_IRQS)
+		return;
+
+	if (irq > 7)
+		imr_port = SLAVE_PIC + IMR;
+	else
+		imr_port = MASTER_PIC + IMR;
+
+	outb(inb(imr_port) & ~(1 << (irq & 7)), imr_port);
+}
+
+void specific_eoi(int irq)
+{
+	if (irq >= CONFIG_SYS_NUM_IRQS)
+		return;
+
+	if (irq > 7) {
+		/*
+		 *  IRQ is on the slave - Issue a corresponding EOI to the
+		 *  slave PIC and an EOI for IRQ2 (the cascade interrupt)
+		 *  on the master PIC
+		 */
+		outb(OCW2_SEOI | (irq & 7), SLAVE_PIC + OCW2);
+		irq = SEOI_IR2;
+	}
+
+	outb(OCW2_SEOI | irq, MASTER_PIC + OCW2);
+}