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      1 /*	$NetBSD: cop0.c,v 1.3 2008/04/28 20:23:18 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <lib/libsa/stand.h>
     33 #include <lib/libkern/libkern.h>
     34 
     35 #include "cmd.h"
     36 #include "local.h"
     37 
     38 #define	NTLB	48	/* R4000 */
     39 struct tlb {
     40 	uint32_t PageMask;
     41 	uint32_t EntryHi;
     42 	uint32_t EntryLo0;
     43 	uint32_t EntryLo1;
     44 	uint32_t page_mask;
     45 	char *page_size;
     46 	uint32_t vpn, pfn0, pfn1;
     47 } entry[NTLB];
     48 static void __tlb_pagemask(struct tlb *);
     49 
     50 
     51 /*
     52 EWS4800/350. IPL don't handle TLB refill exception.
     53 
     54 16M-page
     55 paddr  0x00000000-0x18000000	M0, M1, M2
     56 vaddr  0x00000000-0x18000000
     57 
     58 paddr  0x38000000-0x40000000	M3
     59 vaddr  0x18000000-0x20000000
     60 
     61 paddr  0xe0000000-0xf8000000	FrameBuffer 0xf0000000 + reg 0xf5000000
     62 vaddr  0xe0000000-0xf8000000
     63 
     64 4K-page
     65 paddr  0x20000000-0x20028000	160K
     66 vaddr  0x20000000-0x20028000
     67  */
     68 int
     69 cmd_tlb(int argc, char *argp[], int interactive)
     70 {
     71 	extern void tlb_read(int, void *);
     72 	struct tlb  *e;
     73 	int i;
     74 
     75 	if (argc < 2) {
     76 		printf("option: r, d, p entry#\n");
     77 		return 1;
     78 	}
     79 
     80 	switch (*argp[1]) {
     81 	case 'r':	/* Read TLB entry all. */
     82 		for (i = 0; i < NTLB; i++)
     83 			tlb_read(i, &entry[i]);
     84 		printf("done.\n");
     85 		break;
     86 	case 'd':	/* Dump TLB summary */
     87 		for (i = 0, e = entry; i < NTLB; i++, e++) {
     88 			__tlb_pagemask(e);
     89 			e->vpn = (e->EntryHi >> 13) << 1;
     90 			e->pfn0 = (e->EntryLo0 >> 6);
     91 			e->pfn1 = (e->EntryLo1 >> 6);
     92 			printf("%d %s %x %x+%x", i, e->page_size, e->vpn,
     93 			    e->pfn0, e->pfn1);
     94 			putchar((i + 1) & 3 ? '|' : '\n');
     95 		}
     96 		break;
     97 	case 'p':	/* Print TLB entry */
     98 		if (argc < 3) {
     99 			printf("tlb p entry#.\n");
    100 			return 1;
    101 		}
    102 		i = strtoul(argp[2], 0, 0);
    103 		if (i < 0 || i >= NTLB)
    104 			return 1;
    105 		e = &entry[i];
    106 		printf("[%d] size:%s vaddr:0x%08x paddr:0x%08x+0x%08x "
    107 		    "mask:0x%08x\n", i, e->page_size, e->vpn << 12,
    108 		    e->pfn0 << 12, e->pfn1 << 12, e->page_mask);
    109 		printf("[%x, %x, %x, %x]\n",
    110 		    e->PageMask, e->EntryHi, e->EntryLo0, e->EntryLo1);
    111 
    112 		break;
    113 	default:
    114 		printf("unknown option \"%c\"\n", *argp[1]);
    115 		break;
    116 	}
    117 
    118 	return 0;
    119 }
    120 
    121 int
    122 cmd_cop0(int argc, char *argp[], int interactive)
    123 {
    124 	int v;
    125 
    126 	__asm volatile("mfc0 %0, $%1" : "=r"(v) : "i"(15));
    127 	printf("PRId: %x\n", v);
    128 	__asm volatile("mfc0 %0, $%1" : "=r"(v) : "i"(16));
    129 	printf("Config: %x\n", v);
    130 	__asm volatile("mfc0 %0, $%1" : "=r"(v) : "i"(12));
    131 	printf("Status: %x\n", v);
    132 	__asm volatile("mfc0 %0, $%1" : "=r"(v) : "i"(13));
    133 	printf("Cause: %x\n", v);
    134 	__asm volatile("mfc0 %0, $%1" : "=r"(v) : "i"(8));
    135 	printf("BadVAddr: %x\n", v);
    136 	__asm volatile("mfc0 %0, $%1" : "=r"(v) : "i"(14));
    137 	printf("EPC: %x\n", v);
    138 
    139 	return 0;
    140 }
    141 
    142 void
    143 __tlb_pagemask(struct tlb *e)
    144 {
    145 
    146 	switch (e->PageMask >> 13) {
    147 	default:
    148 		e->page_size = " ERR";
    149 		e->page_mask = 0;
    150 		break;
    151 	case 0:
    152 		e->page_size = "  4K";
    153 		e->page_mask = 0xfff;
    154 		break;
    155 	case 3:
    156 		e->page_size = " 16K";
    157 		e->page_mask = 0x3fff;
    158 		break;
    159 	case 0xf:
    160 		e->page_size = " 64K";
    161 		e->page_mask = 0xffff;
    162 		break;
    163 	case 0x3f:
    164 		e->page_size = "256K";
    165 		e->page_mask = 0x3ffff;
    166 		break;
    167 	case 0xff:
    168 		e->page_size = "  1M";
    169 		e->page_mask = 0xfffff;
    170 		break;
    171 	case 0x3ff:
    172 		e->page_size = "  4M";
    173 		e->page_mask = 0x3fffff;
    174 		break;
    175 	case 0xfff:
    176 		e->page_size = " 16M";
    177 		e->page_mask = 0xffffff;
    178 		break;
    179 	}
    180 }
    181