cpu.h

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/*	$OpenBSD: cpu.h,v 1.4 1998/09/15 10:50:12 pefo Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell and Rick Macklem.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	Copyright (C) 1989 Digital Equipment Corporation.
 *	Permission to use, copy, modify, and distribute this software and
 *	its documentation for any purpose and without fee is hereby granted,
 *	provided that the above copyright notice appears in all copies.
 *	Digital Equipment Corporation makes no representations about the
 *	suitability of this software for any purpose.  It is provided "as is"
 *	without express or implied warranty.
 *
 *	from: @(#)cpu.h	8.4 (Berkeley) 1/4/94
 */

#ifndef _MIPS_CPU_H_
#define _MIPS_CPU_H_

#include <machine/psl.h>

#define KUSEG_ADDR		0x0
#define CACHED_MEMORY_ADDR	0x80000000
#define UNCACHED_MEMORY_ADDR	0xa0000000
#define KSEG2_ADDR		0xc0000000
#define MAX_MEM_ADDR		0xbe000000
#define	RESERVED_ADDR		0xbfc80000

#define K_CALG_UNCACHED         2
#define K_CALG_NONCOHERENT      3
#define K_CALG_COH_SHAREABLE    5

#ifndef _LOCORE
#define	CACHED_TO_PHYS(x)	((unsigned)(x) & 0x1fffffff)
#define	PHYS_TO_CACHED(x)	((unsigned)(x) | CACHED_MEMORY_ADDR)
#define	UNCACHED_TO_PHYS(x) 	((unsigned)(x) & 0x1fffffff)
#define	PHYS_TO_UNCACHED(x) 	((unsigned)(x) | UNCACHED_MEMORY_ADDR)
#define VA_TO_CINDEX(x) 	((unsigned)(x) & 0xffffff | CACHED_MEMORY_ADDR)
#define	CACHED_TO_UNCACHED(x)	(PHYS_TO_UNCACHED(CACHED_TO_PHYS(x)))
#define PHYS_TO_XKPHYS(cca, x)	(0x8000000000000000LL|((u_int64_t)cca<<59)|(x))
#define	PHYS_TO_X_UNCACHED(p)	PHYS_TO_XKPHYS(K_CALG_UNCACHED,(p))
#define	PHYS_TO_X_CACHED(p)	PHYS_TO_XKPHYS(K_CALG_COH_SHAREABLE,(p))
#else
#define	CACHED_TO_PHYS(x)	((x) & 0x1fffffff)
#define	PHYS_TO_CACHED(x)	((x) | CACHED_MEMORY_ADDR)
#define	UNCACHED_TO_PHYS(x) 	((x) & 0x1fffffff)
#define	PHYS_TO_UNCACHED(x) 	((x) | UNCACHED_MEMORY_ADDR)
#define VA_TO_CINDEX(x) 	((x) & 0xffffff | CACHED_MEMORY_ADDR)
#define	CACHED_TO_UNCACHED(x)	(PHYS_TO_UNCACHED(CACHED_TO_PHYS(x)))
#define PHYS_TO_XKPHYS(cca, x)	(0x8000000000000000|(cca << 59)|(x))
#define	PHYS_TO_X_UNCACHED(p)	PHYS_TO_XKPHYS(K_CALG_UNCACHED,(p))
#define	PHYS_TO_X_CACHED(p)	PHYS_TO_XKPHYS(K_CALG_COH_SHAREABLE,(p))
#endif

#ifdef _KERNEL
/*
 * The bits in the cause register.
 *
 *	CR_BR_DELAY	Exception happened in branch delay slot.
 *	CR_COP_ERR		Coprocessor error.
 *	CR_IP		Interrupt pending bits defined below.
 *	CR_EXC_CODE	The exception type (see exception codes below).
 */
#define CR_BR_DELAY		0x80000000
#define CR_COP_ERR		0x30000000
#define CR_EXC_CODE		0x0000007c
#define CR_IP			0x0000FF00
#define CR_EXC_CODE_SHIFT	2

/*
 * The bits in the status register.  All bits are active when set to 1.
 */
#define SR_COP_USABILITY	0xf0000000
#define SR_COP_0_BIT		0x10000000
#define SR_COP_1_BIT		0x20000000
#define SR_RP			0x08000000
#define SR_FR_32		0x04000000
#define SR_RE			0x02000000
#define SR_BOOT_EXC_VEC		0x00400000
#define SR_TLB_SHUTDOWN		0x00200000
#define SR_SOFT_RESET		0x00100000
#define SR_DIAG_CH		0x00040000
#define SR_DIAG_CE		0x00020000
#define SR_DIAG_DE		0x00010000
#define SR_KX			0x00000080
#define SR_SX			0x00000040
#define SR_UX			0x00000020
#define SR_KSU_MASK		0x00000018
#define SR_KSU_USER		0x00000010
#define SR_KSU_SUPER		0x00000008
#define SR_KSU_KERNEL		0x00000000
#define SR_ERL			0x00000004
#define SR_EXL			0x00000002
#define SR_INT_ENAB		0x00000001
/*#define SR_INT_MASK		0x0000ff00*/

/*
 * The interrupt masks.
 * If a bit in the mask is 1 then the interrupt is enabled (or pending).
 */
#define INT_MASK		0xff00
#define INT_MASK_5		0x8000
#define INT_MASK_4		0x4000
#define INT_MASK_3		0x2000
#define INT_MASK_2		0x1000
#define INT_MASK_1		0x0800
#define INT_MASK_0		0x0400
#define HARD_INT_MASK		0xfc00
#define SOFT_INT_MASK_1		0x0200
#define SOFT_INT_MASK_0		0x0100

/*
 * RM7000 cause register expansion.
 */
#define	INT_MASK_PERF		0x00200000	/* 13 Performance counter */
#define	INT_MASK_TIMR		0x00100000	/* 12 Timer */

/*
 * The bits in the context register.
 */
#define CNTXT_PTE_BASE		0xff800000
#define CNTXT_BAD_VPN2		0x007ffff0

/*
 * Location of exception vectors.
 */
#define RESET_EXC_VEC		0xbfc00000
#define TLB_MISS_EXC_VEC	0x80000000
#define XTLB_MISS_EXC_VEC	0x80000080
#define CACHE_ERR_EXC_VEC	0x80000100
#define GEN_EXC_VEC		0x80000180

/*
 * Coprocessor 0 registers:
 */
#define COP_0_TLB_INDEX		$0
#define COP_0_TLB_RANDOM	$1
#define COP_0_TLB_LO0		$2
#define COP_0_TLB_LO1		$3
#define COP_0_TLB_CONTEXT	$4
#define COP_0_TLB_PG_MASK	$5
#define COP_0_TLB_WIRED		$6
#define COP_0_BAD_VADDR		$8
#define COP_0_COUNT		$9
#define COP_0_TLB_HI		$10
#define COP_0_COMPARE		$11
#define COP_0_STATUS_REG	$12
#define COP_0_CAUSE_REG		$13
#define COP_0_EXC_PC		$14
#define COP_0_PRID		$15
#define COP_0_CONFIG		$16
#define COP_0_LLADDR		$17
#define COP_0_WATCH_LO		$18
#define COP_0_WATCH_HI		$19
#define COP_0_TLB_XCONTEXT	$20
#define COP_0_ECC		$26
#define COP_0_CACHE_ERR		$27
#define COP_0_TAG_LO		$28
#define COP_0_TAG_HI		$29
#define COP_0_ERROR_PC		$30
/* RM7000 specific */
#define COP_0_WATCH_1		$18
#define COP_0_WATCH_2		$19
#define COP_0_WATCH_M		$24
#define COP_0_PC_COUNT		$25
#define COP_0_PC_CTRL		$22

#define	COP_0_ICR		$20		/* CFC */
#define	COP_0_DERR_0		$26		/* CFC */
#define	COP_0_DERR_1		$27		/* CFC */

/*
 * Values for the code field in a break instruction.
 */
#define BREAK_INSTR		0x0000000d
#define BREAK_VAL_MASK		0x03ff0000
#define BREAK_VAL_SHIFT		16
#define BREAK_KDB_VAL		512
#define BREAK_SSTEP_VAL		513
#define BREAK_BRKPT_VAL		514
#define BREAK_SOVER_VAL		515
#define BREAK_DDB_VAL		516
#define BREAK_KDB	(BREAK_INSTR | (BREAK_KDB_VAL << BREAK_VAL_SHIFT))
#define BREAK_SSTEP	(BREAK_INSTR | (BREAK_SSTEP_VAL << BREAK_VAL_SHIFT))
#define BREAK_BRKPT	(BREAK_INSTR | (BREAK_BRKPT_VAL << BREAK_VAL_SHIFT))
#define BREAK_SOVER	(BREAK_INSTR | (BREAK_SOVER_VAL << BREAK_VAL_SHIFT))
#define BREAK_DDB	(BREAK_INSTR | (BREAK_DDB_VAL << BREAK_VAL_SHIFT))

/*
 * Mininum and maximum cache sizes.
 */
#define MIN_CACHE_SIZE		(16 * 1024)
#define MAX_CACHE_SIZE		(256 * 1024)

/*
 * The floating point version and status registers.
 */
#define	FPC_ID			$0
#define	FPC_CSR			$31

/*
 * The floating point coprocessor status register bits.
 */
#define FPC_ROUNDING_BITS		0x00000003
#define FPC_ROUND_RN			0x00000000
#define FPC_ROUND_RZ			0x00000001
#define FPC_ROUND_RP			0x00000002
#define FPC_ROUND_RM			0x00000003
#define FPC_STICKY_BITS			0x0000007c
#define FPC_STICKY_INEXACT		0x00000004
#define FPC_STICKY_UNDERFLOW		0x00000008
#define FPC_STICKY_OVERFLOW		0x00000010
#define FPC_STICKY_DIV0			0x00000020
#define FPC_STICKY_INVALID		0x00000040
#define FPC_ENABLE_BITS			0x00000f80
#define FPC_ENABLE_INEXACT		0x00000080
#define FPC_ENABLE_UNDERFLOW		0x00000100
#define FPC_ENABLE_OVERFLOW		0x00000200
#define FPC_ENABLE_DIV0			0x00000400
#define FPC_ENABLE_INVALID		0x00000800
#define FPC_EXCEPTION_BITS		0x0003f000
#define FPC_EXCEPTION_INEXACT		0x00001000
#define FPC_EXCEPTION_UNDERFLOW		0x00002000
#define FPC_EXCEPTION_OVERFLOW		0x00004000
#define FPC_EXCEPTION_DIV0		0x00008000
#define FPC_EXCEPTION_INVALID		0x00010000