arch/powerpc/include/asm/exception-64s.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/exception-64s.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/exception-64s.h
Extension
.h
Size
4353 bytes
Lines
179
Domain
Architecture Layer
Bucket
arch/powerpc
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

#ifndef _ASM_POWERPC_EXCEPTION_H
#define _ASM_POWERPC_EXCEPTION_H
/*
 * Extracted from head_64.S
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
 *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
 *  Adapted for Power Macintosh by Paul Mackerras.
 *  Low-level exception handlers and MMU support
 *  rewritten by Paul Mackerras.
 *    Copyright (C) 1996 Paul Mackerras.
 *
 *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
 *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
 *
 *  This file contains the low-level support and setup for the
 *  PowerPC-64 platform, including trap and interrupt dispatch.
 */
/*
 * The following macros define the code that appears as
 * the prologue to each of the exception handlers.  They
 * are split into two parts to allow a single kernel binary
 * to be used for pSeries and iSeries.
 *
 * We make as much of the exception code common between native
 * exception handlers (including pSeries LPAR) and iSeries LPAR
 * implementations as possible.
 */
#include <asm/feature-fixups.h>

/* PACA save area size in u64 units (exgen, exmc, etc) */
#define EX_SIZE		10

/* PACA save area offsets */
#define EX_R9		0
#define EX_R10		8
#define EX_R11		16
#define EX_R12		24
#define EX_R13		32
#define EX_DAR		40
#define EX_DSISR	48
#define EX_CCR		52
#define EX_CFAR		56
#define EX_PPR		64
#define EX_CTR		72

/*
 * maximum recursive depth of MCE exceptions
 */
#define MAX_MCE_DEPTH	4

#ifdef __ASSEMBLER__

#define STF_ENTRY_BARRIER_SLOT						\
	STF_ENTRY_BARRIER_FIXUP_SECTION;				\
	nop;								\
	nop;								\
	nop

#define STF_EXIT_BARRIER_SLOT						\
	STF_EXIT_BARRIER_FIXUP_SECTION;					\
	nop;								\
	nop;								\
	nop;								\
	nop;								\
	nop;								\
	nop

#define ENTRY_FLUSH_SLOT						\
	ENTRY_FLUSH_FIXUP_SECTION;					\
	nop;								\
	nop;								\
	nop;

#define SCV_ENTRY_FLUSH_SLOT						\
	SCV_ENTRY_FLUSH_FIXUP_SECTION;					\
	nop;								\
	nop;								\
	nop;

/*
 * r10 must be free to use, r13 must be paca
 */
#define INTERRUPT_TO_KERNEL						\
	STF_ENTRY_BARRIER_SLOT;						\
	ENTRY_FLUSH_SLOT

Annotation

Implementation Notes