1 files changed, 83 insertions, 0 deletions
diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h
new file mode 100644
index 000000000..89789e8c8
--- /dev/null
+++ b/arch/x86/include/asm/i8259.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_I8259_H
+#define _ASM_X86_I8259_H
+
+#include <linux/delay.h>
+#include <asm/io.h>
+
+extern unsigned int cached_irq_mask;
+
+#define __byte(x, y)		(((unsigned char *)&(y))[x])
+#define cached_master_mask	(__byte(0, cached_irq_mask))
+#define cached_slave_mask	(__byte(1, cached_irq_mask))
+
+/* i8259A PIC registers */
+#define PIC_MASTER_CMD		0x20
+#define PIC_MASTER_IMR		0x21
+#define PIC_MASTER_ISR		PIC_MASTER_CMD
+#define PIC_MASTER_POLL		PIC_MASTER_ISR
+#define PIC_MASTER_OCW3		PIC_MASTER_ISR
+#define PIC_SLAVE_CMD		0xa0
+#define PIC_SLAVE_IMR		0xa1
+
+/* i8259A PIC related value */
+#define PIC_CASCADE_IR		2
+#define MASTER_ICW4_DEFAULT	0x01
+#define SLAVE_ICW4_DEFAULT	0x01
+#define PIC_ICW4_AEOI		2
+
+extern raw_spinlock_t i8259A_lock;
+
+/* the PIC may need a careful delay on some platforms, hence specific calls */
+static inline unsigned char inb_pic(unsigned int port)
+{
+	unsigned char value = inb(port);
+
+	/*
+	 * delay for some accesses to PIC on motherboard or in chipset
+	 * must be at least one microsecond, so be safe here:
+	 */
+	udelay(2);
+
+	return value;
+}
+
+static inline void outb_pic(unsigned char value, unsigned int port)
+{
+	outb(value, port);
+	/*
+	 * delay for some accesses to PIC on motherboard or in chipset
+	 * must be at least one microsecond, so be safe here:
+	 */
+	udelay(2);
+}
+
+extern struct irq_chip i8259A_chip;
+
+struct legacy_pic {
+	int nr_legacy_irqs;
+	struct irq_chip *chip;
+	void (*mask)(unsigned int irq);
+	void (*unmask)(unsigned int irq);
+	void (*mask_all)(void);
+	void (*restore_mask)(void);
+	void (*init)(int auto_eoi);
+	int (*probe)(void);
+	int (*irq_pending)(unsigned int irq);
+	void (*make_irq)(unsigned int irq);
+};
+
+extern struct legacy_pic *legacy_pic;
+extern struct legacy_pic null_legacy_pic;
+
+static inline bool has_legacy_pic(void)
+{
+	return legacy_pic != &null_legacy_pic;
+}
+
+static inline int nr_legacy_irqs(void)
+{
+	return legacy_pic->nr_legacy_irqs;
+}
+
+#endif /* _ASM_X86_I8259_H */