ich2/smram-ich2.c

   1 #include "reg-82815.h"
   2 #include <pci.h>
   3 #include <smram.h>
   4
   5 #ifdef __linux__
   6
   7 static unsigned long memsz[] = {
   8         0,                      // 0
   9         32*1024*1024,           // 1
  10         32*1024*1024,           // 2
  11         48*1024*1024,           // 3
  12         64*1024*1024,           // 4
  13         64*1024*1024,           // 5
  14         96*1024*1024,           // 6
  15         128*1024*1024,          // 7
  16         128*1024*1024,          // 8
  17         128*1024*1024,          // 9
  18         128*1024*1024,          // A
  19         192*1024*1024,          // B
  20         256*1024*1024,          // C
  21         256*1024*1024,          // D
  22         256*1024*1024,          // E
  23         512*1024*1024           // F
  24 };
  25
  26 void smram_aseg_dump(void) {
  27
  28         unsigned char smramc, drp, drp2;
  29         unsigned int tom = 0;
  30         int usmm, lsmm;
  31
  32         smramc = pci_read8(0, 0, 0, SMRAMC);
  33         drp = pci_read8(0, 0, 0, DRP);
  34         drp2 = pci_read8(0, 0, 0, DRP2);
  35
  36         printf("SMRAMC: %02x\n", smramc);
  37
  38         tom += memsz[drp & 0xF];
  39         tom += memsz[drp >> 4];
  40         tom += memsz[drp2 & 0xF];
  41
  42         printf("Top of DRAM: %08x\n", tom);
  43
  44         usmm = (smramc >> 4) & 0x3;
  45         lsmm = (smramc >> 2) & 0x3;
  46
  47         switch (usmm)
  48         {
  49         case 0:
  50                 printf("TSEG and HSEG both off\n");
  51                 break;
  52         case 1:
  53                 printf("TSEG off, HSEG %s\n", lsmm ? "off" : "on");
  54                 break;
  55         case 2:
  56                 printf("TSEG 512KB (%08x - %08x), HSEG %s\n",
  57                         tom - 512 * 1024, tom - 1, lsmm ? "off" : "on");
  58                 break;
  59         case 3:
  60                 printf("TSEG 1MB (%08x - %08x), HSEG %s\n",
  61                         tom - 1 * 1024 * 1024, tom - 1, lsmm ? "off" : "on");
  62                 break;
  63         }
  64
  65         switch (lsmm)
  66         {
  67         case 0:
  68                 printf("ABSEG disabled\n");
  69                 break;
  70         case 1:
  71                 printf("ABSEG enabled as system RAM\n");
  72                 break;
  73         case 2:
  74                 printf("ABSEG enabled for SMM code only\n");
  75                 break;
  76         case 3:
  77                 printf("ABSEG enabled for both SMM code and data\n");
  78                 break;
  79         }
  80 }
  81 #endif
  82
  83 int smram_locked()
  84 {
  85         unsigned char smramc = pci_read8(0, 0, 0, SMRAMC);
  86
  87         return (smramc & SMRAMC_LOCK) ? 1 : 0;
  88 }
  89
  90 smram_state_t smram_save_state()
  91 {
  92         return pci_read8(0, 0, 0, SMRAMC);
  93 }
  94
  95 void smram_restore_state(smram_state_t state)
  96 {
  97         return pci_write8(0, 0, 0, SMRAMC, state);
  98 }
  99
 100 int smram_aseg_set_state (int open) {
 101         unsigned char smramc;
 102
 103         if (smram_locked())
 104                 return -1;
 105
 106         smramc = pci_read8(0, 0, 0, SMRAMC);
 107
 108         switch (open)
 109         {
 110         case SMRAM_ASEG_CLOSED:
 111                 smramc = (smramc & 0xF0) | 0x00;
 112                 break;
 113         case SMRAM_ASEG_OPEN:
 114                 smramc = (smramc & 0xF0) | 0x04;
 115                 break;
 116         case SMRAM_ASEG_SMMCODE:
 117                 smramc = (smramc & 0xF0) | 0x08;
 118                 break;
 119         case SMRAM_ASEG_SMMONLY:
 120                 smramc = (smramc & 0xF0) | 0x0C;
 121                 break;
 122         default:
 123                 return -1;
 124         }
 125
 126         pci_write8(0, 0, 0, SMRAMC, smramc);
 127
 128         return 0;
 129 }