patch-2.1.116 linux/arch/alpha/kernel/sys_jensen.c

• Lines: 147
• Date: Sun Aug 9 12:09:05 1998
• Orig file: v2.1.115/linux/arch/alpha/kernel/sys_jensen.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.115/linux/arch/alpha/kernel/sys_jensen.c linux/arch/alpha/kernel/sys_jensen.c
@@ -0,0 +1,146 @@
+/*
+ *	linux/arch/alpha/kernel/sys_jensen.c
+ *
+ *	Copyright (C) 1995 Linus Torvalds
+ *	Copyright (C) 1998 Richard Henderson
+ *
+ * Code supporting the Jensen.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/ptrace.h>
+#include <asm/system.h>
+
+#define __EXTERN_INLINE inline
+#include <asm/io.h>
+#include <asm/jensen.h>
+#undef  __EXTERN_INLINE
+
+#include <asm/dma.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+
+#include "proto.h"
+#include "irq.h"
+#include "machvec.h"
+
+
+static void
+jensen_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
+{
+	if (irq >= 8)
+		outb(mask >> 8, 0xA1);
+	else
+		outb(mask, 0x21);
+}
+
+/*
+ * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
+ * 0x9X0 for the local motherboard interrupts..
+ *
+ *	0x660 - NMI
+ *
+ *	0x800 - IRQ0  interval timer (not used, as we use the RTC timer)
+ *	0x810 - IRQ1  line printer (duh..)
+ *	0x860 - IRQ6  floppy disk
+ *	0x8E0 - IRQ14 SCSI controller
+ *
+ *	0x900 - COM1
+ *	0x920 - COM2
+ *	0x980 - keyboard
+ *	0x990 - mouse
+ *
+ * PCI-based systems are more sane: they don't have the local
+ * interrupts at all, and have only normal PCI interrupts from
+ * devices.  Happily it's easy enough to do a sane mapping from the
+ * Jensen..  Note that this means that we may have to do a hardware
+ * "ack" to a different interrupt than we report to the rest of the
+ * world.
+ */
+
+static void
+handle_nmi(struct pt_regs * regs)
+{
+	printk("Whee.. NMI received. Probable hardware error\n");
+	printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
+}
+
+static void 
+jensen_device_interrupt(unsigned long vector, struct pt_regs * regs)
+{
+	int irq, ack;
+	unsigned long flags;
+
+	__save_and_cli(flags);
+	ack = irq = (vector - 0x800) >> 4;
+
+	switch (vector) {
+	case 0x660: handle_nmi(regs); return;
+
+	/* local device interrupts: */
+	case 0x900: irq = 4, ack = -1; break;		/* com1 -> irq 4 */
+	case 0x920: irq = 3, ack = -1; break;		/* com2 -> irq 3 */
+	case 0x980: irq = 1, ack = -1; break;		/* kbd -> irq 1 */
+	case 0x990: irq = 9, ack = -1; break;		/* mouse -> irq 9 */
+	default:
+		if (vector > 0x900) {
+			printk("Unknown local interrupt %lx\n", vector);
+		}
+
+		/* irq1 is supposed to be the keyboard, silly Jensen
+		   (is this really needed??) */
+		if (irq == 1)
+			irq = 7;
+		break;
+	}
+
+	handle_irq(irq, ack, regs);
+	__restore_flags(flags);
+}
+
+static void
+jensen_init_irq(void)
+{
+	STANDARD_INIT_IRQ_PROLOG;
+
+	enable_irq(2);			/* enable cascade */
+}
+
+static void
+jensen_machine_check (u64 vector, u64 la, struct pt_regs *regs)
+{
+	printk(KERN_CRIT "Machine check\n");
+}
+
+
+/*
+ * The System Vector
+ */
+
+struct alpha_machine_vector jensen_mv __initmv = {
+	vector_name:		"Jensen",
+	DO_EV4_MMU,
+	IO_LITE(JENSEN,jensen,jensen),
+	BUS(jensen),
+	machine_check:		jensen_machine_check,
+	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
+
+	nr_irqs:		16,
+	irq_probe_mask:		_PROBE_MASK(16),
+	update_irq_hw:		jensen_update_irq_hw,
+	ack_irq:		generic_ack_irq,
+	device_interrupt:	jensen_device_interrupt,
+
+	init_arch:		NULL,
+	init_irq:		jensen_init_irq,
+	init_pit:		generic_init_pit,
+	kill_arch:		generic_kill_arch,
+};
+ALIAS_MV(jensen)