hardware/ich2/smm-open-ich2.c

   1 /* smm-open-ich2.c
   2  * SMRAM control utility for ICH2 northbridge
   3  * NetWatch system management mode administration console
   4  *
   5  * Copyright (c) 2008 Jacob Potter and Joshua Wise.  All rights reserved.
   6  * This program is free software; you can redistribute and/or modify it under
   7  * the terms found in the file LICENSE in the root of this source tree.
   8  *
   9  */
  10
  11
  12 #include "reg-82815.h"
  13 #include <unistd.h>
  14 #include <getopt.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 /***********************************************************************
  19  * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED
  20  *
  21  * This should be replaced by ../util/smram-ich2 once it's verified to work properly.
  22  */
  23
  24 unsigned long memsz[] = {
  25         0,                      // 0
  26         32*1024*1024,           // 1
  27         32*1024*1024,           // 2
  28         48*1024*1024,           // 3
  29         64*1024*1024,           // 4
  30         64*1024*1024,           // 5
  31         96*1024*1024,           // 6
  32         128*1024*1024,          // 7
  33         128*1024*1024,          // 8
  34         128*1024*1024,          // 9
  35         128*1024*1024,          // A
  36         192*1024*1024,          // B
  37         256*1024*1024,          // C
  38         256*1024*1024,          // D
  39         256*1024*1024,          // E
  40         512*1024*1024           // F
  41 };
  42
  43 void dump(unsigned char smramc, unsigned char drp, unsigned char drp2) {
  44
  45         unsigned int tom = 0;
  46         int usmm, lsmm;
  47
  48         printf("SMRAMC: %02x\n", smramc);
  49
  50         tom += memsz[drp & 0xF];
  51         tom += memsz[drp >> 4];
  52         tom += memsz[drp2 & 0xF];
  53
  54         printf("Top of DRAM: %08x\n", tom);
  55
  56         usmm = (smramc >> 4) & 0x3;
  57         lsmm = (smramc >> 2) & 0x3;
  58
  59         switch (usmm)
  60         {
  61         case 0:
  62                 printf("TSEG and HSEG both off\n");
  63                 break;
  64         case 1:
  65                 printf("TSEG off, HSEG %s\n", lsmm ? "off" : "on");
  66                 break;
  67         case 2:
  68                 printf("TSEG 512KB (%08x - %08x), HSEG %s\n",
  69                         tom - 512 * 1024, tom - 1, lsmm ? "off" : "on");
  70                 break;
  71         case 3:
  72                 printf("TSEG 1MB (%08x - %08x), HSEG %s\n",
  73                         tom - 1 * 1024 * 1024, tom - 1, lsmm ? "off" : "on");
  74                 break;
  75         }
  76
  77         switch (lsmm)
  78         {
  79         case 0:
  80                 printf("ABSEG disabled\n");
  81                 break;
  82         case 1:
  83                 printf("ABSEG enabled as system RAM\n");
  84                 break;
  85         case 2:
  86                 printf("ABSEG enabled for SMM code only\n");
  87                 break;
  88         case 3:
  89                 printf("ABSEG enabled for both SMM code and data\n");
  90                 break;
  91         }
  92 }
  93
  94 static struct option longopts[] = {
  95         { "open",       no_argument,    NULL,   'o'     },
  96         { "close",      no_argument,    NULL,   'c'     },
  97         { "smram",      no_argument,    NULL,   's'     },
  98         { "dump",       no_argument,    NULL,   'd'     },
  99         { NULL,         0,              NULL,   0       }
 100 };
 101
 102 #define OP_DUMP 1
 103 #define OP_SET 2
 104
 105 void usage(int argc, char **argv)
 106 {
 107         printf("Usage: %s [ --dump ] [ --open | --close | --smram=value ]\n",
 108                 argv[0]);
 109         exit(1);
 110 }
 111
 112 int main(int argc, char **argv)
 113 {
 114         unsigned char smramc, drp, drp2;
 115
 116         if (geteuid() != 0)
 117         {
 118                 printf("This program must be run as root, dumbass.\n");
 119                 return 1;
 120         }
 121
 122         smramc = pci_read8(0, 0, 0, SMRAMC);
 123         drp = pci_read8(0, 0, 0, DRP);
 124         drp2 = pci_read8(0, 0, 0, DRP2);
 125
 126         if (smramc & SMRAMC_LOCK)
 127         {
 128                 printf("SMRAM is locked, cannot load anything :-(\n");
 129                 return 1;
 130         }
 131
 132         int ch;
 133         int op = 0;
 134         int new_smramc = smramc;
 135
 136         while ((ch = getopt_long(argc, argv, "ocsd:", longopts, NULL)) != -1)
 137         {
 138                 switch (ch)
 139                 {
 140                 case 's':
 141                         if (op & OP_SET) usage(argc, argv);
 142                         op |= OP_SET;
 143                         new_smramc = strtoul(optarg, 0, 0);
 144                         break;
 145                 case 'o':
 146                         if (op & OP_SET) usage(argc, argv);
 147                         op |= OP_SET;
 148                         /* Set LSMM to 01 (ABseg = system RAM) */
 149                         new_smramc = (smramc & 0xF0) | 0x04;
 150                         break;
 151                 case 'c':
 152                         if (op & OP_SET) usage(argc, argv);
 153                         op |= OP_SET;
 154                         /* Set LSMM to 11 (ABseg = SMM RAM) */
 155                         new_smramc = (smramc & 0xF0) | 0x0C;
 156                         break;
 157                 case 'd':
 158                         op |= OP_DUMP;
 159                         break;
 160                 default:
 161                         usage(argc, argv);
 162                 }
 163         }
 164
 165         if (!op) usage(argc, argv);
 166
 167         if (op & OP_DUMP)
 168         {
 169                 dump(smramc, drp, drp2);
 170         }
 171
 172         if (op & OP_SET)
 173         {
 174                 pci_write8(0, 0, 0, SMRAMC, new_smramc);
 175                 if (op & OP_DUMP)
 176                 {
 177                         printf("SMRAM set to 0x%02x\n", new_smramc);
 178                 }
 179         }
 180
 181         return 0;
 182 }