arch/alpha/kernel/sys_sable.c

Source file repositories/reference/linux-study-clean/arch/alpha/kernel/sys_sable.c

File Facts

System
Linux kernel
Corpus path
arch/alpha/kernel/sys_sable.c
Extension
.c
Size
8873 bytes
Lines
346
Domain
Architecture Layer
Bucket
arch/alpha
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 *	linux/arch/alpha/kernel/sys_sable.c
 *
 *	Copyright (C) 1995 David A Rusling
 *	Copyright (C) 1996 Jay A Estabrook
 *	Copyright (C) 1998, 1999 Richard Henderson
 *
 * Code supporting the Sable, Sable-Gamma, and Lynx systems.
 */

#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/dma.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/core_t2.h>
#include <asm/tlbflush.h>

#include "proto.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"

DEFINE_SPINLOCK(sable_lynx_irq_lock);

typedef struct irq_swizzle_struct
{
	char irq_to_mask[64];
	char mask_to_irq[64];

	/* Note mask bit is true for DISABLED irqs.  */
	unsigned long shadow_mask;

	void (*update_irq_hw)(unsigned long bit, unsigned long mask);
	void (*ack_irq_hw)(unsigned long bit);

} irq_swizzle_t;

static irq_swizzle_t *sable_lynx_irq_swizzle;

static void sable_lynx_init_irq(int nr_of_irqs);

#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SABLE)

/***********************************************************************/
/*
 *   For SABLE, which is really baroque, we manage 40 IRQ's, but the
 *   hardware really only supports 24, not via normal ISA PIC,
 *   but cascaded custom 8259's, etc.
 *	 0-7  (char at 536)
 *	 8-15 (char at 53a)
 *	16-23 (char at 53c)
 *
 * Summary Registers (536/53a/53c):
 *
 * Bit      Meaning               Kernel IRQ
 *------------------------------------------
 * 0        PCI slot 0			34
 * 1        NCR810 (builtin)		33
 * 2        TULIP (builtin)		32
 * 3        mouse			12
 * 4        PCI slot 1			35
 * 5        PCI slot 2			36
 * 6        keyboard			1
 * 7        floppy			6
 * 8        COM2			3
 * 9        parallel port		7
 *10        EISA irq 3			-
 *11        EISA irq 4			-
 *12        EISA irq 5			5
 *13        EISA irq 6			-
 *14        EISA irq 7			-
 *15        COM1			4
 *16        EISA irq 9			9
 *17        EISA irq 10			10
 *18        EISA irq 11			11
 *19        EISA irq 12			-
 *20        EISA irq 13			-
 *21        EISA irq 14			14
 *22        NC				15
 *23        IIC				-
 */

Annotation

Implementation Notes