/*	$NetBSD: alpha_cpu.h,v 1.5 1996/07/14 20:00:37 cgd Exp $	*/

/*
 * Copyright (c) 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#ifndef __ALPHA_ALPHA_CPU_H__
#define	__ALPHA_ALPHA_CPU_H__

/*
 * Alpha CPU + OSF/1 PALcode definitions for use by the kernel.
 *
 * Definitions for:
 *
 *	Process Control Block
 *	Interrupt/Exception/Syscall Stack Frame
 *	Processor Status Register
 *	Machine Check Error Summary Register
 *	Machine Check Logout Area
 *	Virtual Memory Management
 *	Kernel Entry Vectors
 *	MMCSR Fault Type Codes
 *	Translation Buffer Invalidation
 *
 * and miscellaneous PALcode operations.
 */


/*
 * Process Control Block definitions [OSF/1 PALcode Specific]
 */

struct alpha_pcb {
	unsigned long	apcb_ksp;	/* kernel stack ptr */
	unsigned long	apcb_usp;	/* user stack ptr */
	unsigned long	apcb_ptbr;	/* page table base reg */
	unsigned int	apcb_cpc;	/* charged process cycles */
	unsigned int	apcb_asn;	/* address space number */
	unsigned long	apcb_unique;	/* process unique value */
	unsigned long	apcb_flags;	/* flags; see below */
	unsigned long	apcb_decrsv0;	/* DEC reserved */
	unsigned long	apcb_decrsv1;	/* DEC reserved */
};

#define	ALPHA_PCB_FLAGS_FEN	0x0000000000000001
#define	ALPHA_PCB_FLAGS_PME	0x4000000000000000

/*
 * Interrupt/Exception/Syscall "Hardware" (really PALcode)
 * Stack Frame definitions
 *
 * These are quadword offsets from the sp on kernel entry, i.e.
 * to get to the value in question you access (sp + (offset * 8)).
 *
 * On syscall entry, A0-A2 aren't written to memory but space
 * _is_ reserved for them.
 */

#define	ALPHA_HWFRAME_PS	0	/* processor status register */
#define	ALPHA_HWFRAME_PC	1	/* program counter */
#define	ALPHA_HWFRAME_GP	2	/* global pointer */
#define	ALPHA_HWFRAME_A0	3	/* a0 */
#define	ALPHA_HWFRAME_A1	4	/* a1 */
#define	ALPHA_HWFRAME_A2	5	/* a2 */

#define	ALPHA_HWFRAME_SIZE	6	/* 6 8-byte words */

/*
 * Processor Status Register [OSF/1 PALcode Specific]
 *
 * Includes user/kernel mode bit, interrupt priority levels, etc.
 */

#define	ALPHA_PSL_USERMODE	0x0008		/* set -> user mode */
#define	ALPHA_PSL_IPL_MASK	0x0007		/* interrupt level mask */

#define	ALPHA_PSL_IPL_0		0x0000		/* all interrupts enabled */
#define	ALPHA_PSL_IPL_SOFT	0x0001		/* software ints disabled */
#define	ALPHA_PSL_IPL_IO	0x0004		/* I/O dev ints disabled */
#define	ALPHA_PSL_IPL_CLOCK	0x0005		/* clock ints disabled */
#define	ALPHA_PSL_IPL_HIGH	0x0006		/* all but mchecks disabled */

#define	ALPHA_PSL_MUST_BE_ZERO	0xfffffffffffffff0

/* Convenience constants: what must be set/clear in user mode */
#define	ALPHA_PSL_USERSET	ALPHA_PSL_USERMODE
#define	ALPHA_PSL_USERCLR	(ALPHA_PSL_MUST_BE_ZERO | ALPHA_PSL_IPL_MASK)

/*
 * Machine Check Error Summary Register definitions [OSF/1 PALcode Specific]
 *
 * The following bits are values as read.  On write, _PCE, _SCE, and
 * _MIP are "write 1 to clear."
 */

#define	ALPHA_MCES_IMP							\
    0xffffffff00000000	/* impl. dependent */
#define	ALPHA_MCES_RSVD							\
    0x00000000ffffffe0	/* reserved */
#define	ALPHA_MCES_DSC							\
    0x0000000000000010	/* disable system correctable error reporting */
#define	ALPHA_MCES_DPC							\
    0x0000000000000008	/* disable processor correctable error reporting */
#define	ALPHA_MCES_PCE							\
    0x0000000000000004	/* processor correctable error in progress */
#define	ALPHA_MCES_SCE							\
    0x0000000000000002	/* system correctable error in progress */
#define	ALPHA_MCES_MIP							\
    0x0000000000000001	/* machine check in progress */

/*
 * Machine Check Error Summary Register definitions [OSF/1 PALcode Specific]
 */

struct alpha_logout_area {
	unsigned int	la_frame_size;		/* frame size */
	unsigned int	la_flags;		/* flags; see below */
	unsigned int	la_cpu_offset;		/* offset to cpu area */
	unsigned int	la_system_offset;	/* offset to system area */
};

#define	ALPHA_LOGOUT_FLAGS_RETRY	0x80000000	/* OK to continue */
#define	ALPHA_LOGOUT_FLAGS_SE		0x40000000	/* second error */
#define	ALPHA_LOGOUT_FLAGS_SBZ		0x3fffffff	/* should be zero */

#define	ALPHA_LOGOUT_NOT_BUILT						\
    (struct alpha_logout_area *)0xffffffffffffffff)

#define	ALPHA_LOGOUT_PAL_AREA(lap)					\
    (unsigned long *)((unsigned char *)(lap) + 16)
#define	ALPHA_LOGOUT_PAL_SIZE(lap)					\
    ((lap)->la_cpu_offset - 16)
#define	ALPHA_LOGOUT_CPU_AREA(lap)					\
    (unsigned long *)((unsigned char *)(lap) + (lap)->la_cpu_offset)
#define	ALPHA_LOGOUT_CPU_SIZE(lap)					\
    ((lap)->la_system_offset - (lap)->la_cpu_offset)
#define	ALPHA_LOGOUT_SYSTEM_AREA(lap)					\
    (unsigned long *)((unsigned char *)(lap) + (lap)->la_system_offset)
#define	ALPHA_LOGOUT_SYSTEM_SIZE(lap)					\
    ((lap)->la_frame_size - (lap)->la_system_offset)
	
/*
 * Virtual Memory Management definitions [OSF/1 PALcode Specific]
 *
 * Includes user and kernel space addresses and information,
 * page table entry definitions, etc.
 *
 * NOTE THAT THESE DEFINITIONS MAY CHANGE IN FUTURE ALPHA CPUS!
 */

#define	ALPHA_PGSHIFT		13
#define	ALPHA_PGBYTES		(1 << ALPHA_PGSHIFT)

#define	ALPHA_USEG_BASE		0			/* virtual */
#define	ALPHA_USEG_END		0x000003ffffffffff

#define	ALPHA_K0SEG_BASE	0xfffffc0000000000	/* direct-mapped */
#define	ALPHA_K0SEG_END		0xfffffe0000000000
#define	ALPHA_K1SEG_BASE	ALPHA_K0SEG_END		/* virtual */
#define	ALPHA_K1SEG_END		0xffffffffffffffff

#define ALPHA_K0SEG_TO_PHYS(x)	((x) & 0x00000003ffffffff)
#define ALPHA_PHYS_TO_K0SEG(x)	((x) | ALPHA_K0SEG_BASE)

#define	ALPHA_PTE_VALID			0x0001

#define	ALPHA_PTE_FAULT_ON_READ		0x0002
#define	ALPHA_PTE_FAULT_ON_WRITE	0x0004
#define	ALPHA_PTE_FAULT_ON_EXECUTE	0x0008

#define	ALPHA_PTE_ASM			0x0010		/* addr. space match */
#define	ALPHA_PTE_GRANULARITY		0x0060		/* granularity hint */

#define	ALPHA_PTE_PROT			0xff00
#define	ALPHA_PTE_KR			0x0100
#define	ALPHA_PTE_UR			0x0200
#define	ALPHA_PTE_KW			0x1000
#define	ALPHA_PTE_UW			0x2000

#define	ALPHA_PTE_WRITE			(ALPHA_PTE_KW | ALPHA_PTE_KW)

#define	ALPHA_PTE_SOFTWARE		0xffff0000

#define	ALPHA_PTE_PFN			0xffffffff00000000

#define	ALPHA_PTE_TO_PFN(pte)		((pte) >> 32)
#define	ALPHA_PTE_FROM_PFN(pfn)		((pfn) << 32)

typedef unsigned long alpha_pt_entry_t;

/*
 * Kernel Entry Vectors.  [OSF/1 PALcode Specific]
 */

#define	ALPHA_KENTRY_INT	0
#define	ALPHA_KENTRY_ARITH	1
#define	ALPHA_KENTRY_MM		2
#define	ALPHA_KENTRY_IF		3
#define	ALPHA_KENTRY_UNA	4
#define	ALPHA_KENTRY_SYS	5

/*
 * MMCSR Fault Type Codes.  [OSF/1 PALcode Specific]
 */

#define	ALPHA_MMCSR_INVALTRANS	0
#define	ALPHA_MMCSR_ACCESS	1
#define	ALPHA_MMCSR_FOR		2
#define	ALPHA_MMCSR_FOE		3
#define	ALPHA_MMCSR_FOW		4

/*
 * Instruction Fault Type Codes.  [OSF/1 PALcode Specific]
 */

#define	ALPHA_IF_CODE_BPT	0
#define	ALPHA_IF_CODE_BUGCHK	1
#define	ALPHA_IF_CODE_GENTRAP	2
#define	ALPHA_IF_CODE_FEN	3
#define	ALPHA_IF_CODE_OPDEC	4

/*
 * Translation Buffer Invalidation definitions [OSF/1 PALcode Specific]
 */

#define	ALPHA_TBIA()	alpha_pal_tbi(-2, 0)		/* all TB entries */
#define	ALPHA_TBIAP()	alpha_pal_tbi(-1, 0)		/* all per-process */
#define	ALPHA_TBISI(va)	alpha_pal_tbi(1, (va))		/* ITB entry for va */
#define	ALPHA_TBISD(va)	alpha_pal_tbi(2, (va))		/* DTB entry for va */
#define	ALPHA_TBIS(va)	alpha_pal_tbi(3, (va))		/* all for va */

/*
 * Stubs for Alpha instructions normally inaccessible from C.
 */
unsigned long	alpha_rpcc __P((void));
void		alpha_mb __P((void));
void		alpha_wmb __P((void));

/*
 * Stubs for OSF/1 PALcode operations.
 */
void		alpha_pal_imb __P((void));
void		alpha_pal_draina __P((void));
void		alpha_pal_halt __P((void)) __attribute__((__noreturn__));
unsigned long	alpha_pal_rdmces __P((void));
unsigned long	alpha_pal_rdusp __P((void));
unsigned long	alpha_pal_swpipl __P((unsigned long));
unsigned long	_alpha_pal_swpipl __P((unsigned long));	/* for profiling */
void		alpha_pal_tbi __P((unsigned long, vm_offset_t));
unsigned long	alpha_pal_whami __P((void));
void		alpha_pal_wrent __P((void *, unsigned long));
void		alpha_pal_wrfen __P((unsigned long));
void		alpha_pal_wrusp __P((unsigned long));
void		alpha_pal_wrvptptr __P((unsigned long));
void		alpha_pal_wrmces __P((unsigned long));

#endif __ALPHA_ALPHA_CPU_H__