sys_jensen.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

/*
 *	linux/arch/alpha/kernel/sys_jensen.c
 *
 *	Copyright (C) 1995 Linus Torvalds
 *	Copyright (C) 1998, 1999 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_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"


/*
 * 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
jensen_local_ack(unsigned int irq)
{
	/* irq1 is supposed to be the keyboard, silly Jensen.  */
	if (irq == 7)
		i8259a_mask_and_ack_irq(1);
}

static struct hw_interrupt_type jensen_local_irq_type = {
	typename:	"LOCAL",
	startup:	i8259a_startup_irq,
	shutdown:	i8259a_disable_irq,
	enable:		i8259a_enable_irq,
	disable:	i8259a_disable_irq,
	ack:		jensen_local_ack,
	end:		i8259a_end_irq,
};

static void 
jensen_device_interrupt(unsigned long vector, struct pt_regs * regs)
{
	int irq;

	switch (vector) {
	case 0x660:
		printk("Whee.. NMI received. Probable hardware error\n");
		printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
		return;

	/* local device interrupts: */
	case 0x900: irq = 4; break;		/* com1 -> irq 4 */
	case 0x920: irq = 3; break;		/* com2 -> irq 3 */
	case 0x980: irq = 1; break;		/* kbd -> irq 1 */
	case 0x990: irq = 9; break;		/* mouse -> irq 9 */

	default:
		if (vector > 0x900) {
			printk("Unknown local interrupt %lx\n", vector);
			return;
		}

		irq = (vector - 0x800) >> 4;
		if (irq == 1)
			irq = 7;
		break;
	}

	handle_irq(irq, regs);
}

static void __init
jensen_init_irq(void)
{
	init_i8259a_irqs();

	irq_desc[1].handler = &jensen_local_irq_type;
	irq_desc[4].handler = &jensen_local_irq_type;
	irq_desc[3].handler = &jensen_local_irq_type;
	irq_desc[7].handler = &jensen_local_irq_type;
	irq_desc[9].handler = &jensen_local_irq_type;

	common_init_isa_dma();
}

static void __init
jensen_init_arch(void)
{
	struct pci_controler *hose;

	/* Create a hose so that we can report i/o base addresses to
	   userland.  */

	pci_isa_hose = hose = alloc_pci_controler();
	hose->io_space = &ioport_resource;
	hose->mem_space = &iomem_resource;
	hose->index = 0;

	hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
	hose->dense_mem_base = 0;
	hose->sparse_io_base = EISA_IO - IDENT_ADDR;
	hose->dense_io_base = 0;

	hose->sg_isa = hose->sg_pci = NULL;
	__direct_map_base = 0;
	__direct_map_size = 0xffffffff;
}

static void
jensen_machine_check (u64 vector, u64 la, struct pt_regs *regs)
{
	printk(KERN_CRIT "Machine check\n");
}

#define jensen_pci_tbi	((void*)0)


/*
 * The System Vector
 */

struct alpha_machine_vector jensen_mv __initmv = {
	vector_name:		"Jensen",
	DO_EV4_MMU,
	IO_LITE(JENSEN,jensen),
	BUS(jensen),
	machine_check:		jensen_machine_check,
	max_dma_address:	ALPHA_MAX_DMA_ADDRESS,
	rtc_port: 0x170,

	nr_irqs:		16,
	device_interrupt:	jensen_device_interrupt,

	init_arch:		jensen_init_arch,
	init_irq:		jensen_init_irq,
	init_rtc:		common_init_rtc,
	init_pci:		NULL,
	kill_arch:		NULL,
};
ALIAS_MV(jensen)