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   1 /* $Id: memory.c,v 1.15 2000/01/29 01:09:12 anton Exp $
   2  * memory.c: Prom routine for acquiring various bits of information
   3  *           about RAM on the machine, both virtual and physical.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/openprom.h>
  13 #include <asm/sun4prom.h>
  14 #include <asm/oplib.h>
  15
  16 /* This routine, for consistency, returns the ram parameters in the
  17  * V0 prom memory descriptor format.  I choose this format because I
  18  * think it was the easiest to work with.  I feel the religious
  19  * arguments now... ;)  Also, I return the linked lists sorted to
  20  * prevent paging_init() upset stomach as I have not yet written
  21  * the pepto-bismol kernel module yet.
  22  */
  23
  24 struct linux_prom_registers prom_reg_memlist[64];
  25 struct linux_prom_registers prom_reg_tmp[64];
  26
  27 struct linux_mlist_v0 prom_phys_total[64];
  28 struct linux_mlist_v0 prom_prom_taken[64];
  29 struct linux_mlist_v0 prom_phys_avail[64];
  30
  31 struct linux_mlist_v0 *prom_ptot_ptr = prom_phys_total;
  32 struct linux_mlist_v0 *prom_ptak_ptr = prom_prom_taken;
  33 struct linux_mlist_v0 *prom_pavl_ptr = prom_phys_avail;
  34
  35 struct linux_mem_v0 prom_memlist;
  36
  37
  38 /* Internal Prom library routine to sort a linux_mlist_v0 memory
  39  * list.  Used below in initialization.
  40  */
  41 static void __init
  42 prom_sortmemlist(struct linux_mlist_v0 *thislist)
  43 {
  44         int swapi = 0;
  45         int i, mitr, tmpsize;
  46         char *tmpaddr;
  47         char *lowest;
  48
  49         for(i=0; thislist[i].theres_more; i++) {
  50                 lowest = thislist[i].start_adr;
  51                 for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
  52                         if(thislist[mitr].start_adr < lowest) {
  53                                 lowest = thislist[mitr].start_adr;
  54                                 swapi = mitr;
  55                         }
  56                 if(lowest == thislist[i].start_adr) continue;
  57                 tmpaddr = thislist[swapi].start_adr;
  58                 tmpsize = thislist[swapi].num_bytes;
  59                 for(mitr = swapi; mitr > i; mitr--) {
  60                         thislist[mitr].start_adr = thislist[mitr-1].start_adr;
  61                         thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
  62                 }
  63                 thislist[i].start_adr = tmpaddr;
  64                 thislist[i].num_bytes = tmpsize;
  65         }
  66
  67         return;
  68 }
  69
  70 /* Initialize the memory lists based upon the prom version. */
  71 void __init prom_meminit(void)
  72 {
  73         int node = 0;
  74         unsigned int iter, num_regs;
  75         struct linux_mlist_v0 *mptr;  /* ptr for traversal */
  76
  77         switch(prom_vers) {
  78         case PROM_V0:
  79                 /* Nice, kind of easier to do in this case. */
  80                 /* First, the total physical descriptors. */
  81                 for(mptr = (*(romvec->pv_v0mem.v0_totphys)), iter=0;
  82                     mptr; mptr=mptr->theres_more, iter++) {
  83                         prom_phys_total[iter].start_adr = mptr->start_adr;
  84                         prom_phys_total[iter].num_bytes = mptr->num_bytes;
  85                         prom_phys_total[iter].theres_more = &prom_phys_total[iter+1];
  86                 }
  87                 prom_phys_total[iter-1].theres_more = NULL;
  88                 /* Second, the total prom taken descriptors. */
  89                 for(mptr = (*(romvec->pv_v0mem.v0_prommap)), iter=0;
  90                     mptr; mptr=mptr->theres_more, iter++) {
  91                         prom_prom_taken[iter].start_adr = mptr->start_adr;
  92                         prom_prom_taken[iter].num_bytes = mptr->num_bytes;
  93                         prom_prom_taken[iter].theres_more = &prom_prom_taken[iter+1];
  94                 }
  95                 prom_prom_taken[iter-1].theres_more = NULL;
  96                 /* Last, the available physical descriptors. */
  97                 for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0;
  98                     mptr; mptr=mptr->theres_more, iter++) {
  99                         prom_phys_avail[iter].start_adr = mptr->start_adr;
 100                         prom_phys_avail[iter].num_bytes = mptr->num_bytes;
 101                         prom_phys_avail[iter].theres_more = &prom_phys_avail[iter+1];
 102                 }
 103                 prom_phys_avail[iter-1].theres_more = NULL;
 104                 /* Sort all the lists. */
 105                 prom_sortmemlist(prom_phys_total);
 106                 prom_sortmemlist(prom_prom_taken);
 107                 prom_sortmemlist(prom_phys_avail);
 108                 break;
 109         case PROM_V2:
 110         case PROM_V3:
 111                 /* Grrr, have to traverse the prom device tree ;( */
 112                 node = prom_getchild(prom_root_node);
 113                 node = prom_searchsiblings(node, "memory");
 114                 num_regs = prom_getproperty(node, "available",
 115                                             (char *) prom_reg_memlist,
 116                                             sizeof(prom_reg_memlist));
 117                 num_regs = (num_regs/sizeof(struct linux_prom_registers));
 118                 for(iter=0; iter<num_regs; iter++) {
 119                         prom_phys_avail[iter].start_adr =
 120                                 (char *) prom_reg_memlist[iter].phys_addr;
 121                         prom_phys_avail[iter].num_bytes =
 122                                 (unsigned long) prom_reg_memlist[iter].reg_size;
 123                         prom_phys_avail[iter].theres_more =
 124                                 &prom_phys_avail[iter+1];
 125                 }
 126                 prom_phys_avail[iter-1].theres_more = NULL;
 127
 128                 num_regs = prom_getproperty(node, "reg",
 129                                             (char *) prom_reg_memlist,
 130                                             sizeof(prom_reg_memlist));
 131                 num_regs = (num_regs/sizeof(struct linux_prom_registers));
 132                 for(iter=0; iter<num_regs; iter++) {
 133                         prom_phys_total[iter].start_adr =
 134                                 (char *) prom_reg_memlist[iter].phys_addr;
 135                         prom_phys_total[iter].num_bytes =
 136                                 (unsigned long) prom_reg_memlist[iter].reg_size;
 137                         prom_phys_total[iter].theres_more =
 138                                 &prom_phys_total[iter+1];
 139                 }
 140                 prom_phys_total[iter-1].theres_more = NULL;
 141
 142                 node = prom_getchild(prom_root_node);
 143                 node = prom_searchsiblings(node, "virtual-memory");
 144                 num_regs = prom_getproperty(node, "available",
 145                                             (char *) prom_reg_memlist,
 146                                             sizeof(prom_reg_memlist));
 147                 num_regs = (num_regs/sizeof(struct linux_prom_registers));
 148
 149                 /* Convert available virtual areas to taken virtual
 150                  * areas.  First sort, then convert.
 151                  */
 152                 for(iter=0; iter<num_regs; iter++) {
 153                         prom_prom_taken[iter].start_adr =
 154                                 (char *) prom_reg_memlist[iter].phys_addr;
 155                         prom_prom_taken[iter].num_bytes =
 156                                 (unsigned long) prom_reg_memlist[iter].reg_size;
 157                         prom_prom_taken[iter].theres_more =
 158                                 &prom_prom_taken[iter+1];
 159                 }
 160                 prom_prom_taken[iter-1].theres_more = NULL;
 161
 162                 prom_sortmemlist(prom_prom_taken);
 163
 164                 /* Finally, convert. */
 165                 for(iter=0; iter<num_regs; iter++) {
 166                         prom_prom_taken[iter].start_adr =
 167                                 prom_prom_taken[iter].start_adr +
 168                                         prom_prom_taken[iter].num_bytes;
 169                         prom_prom_taken[iter].num_bytes =
 170                                 prom_prom_taken[iter+1].start_adr -
 171                                         prom_prom_taken[iter].start_adr;
 172                 }
 173                 prom_prom_taken[iter-1].num_bytes =
 174                         0xffffffff - (unsigned long) prom_prom_taken[iter-1].start_adr;
 175
 176                 /* Sort the other two lists. */
 177                 prom_sortmemlist(prom_phys_total);
 178                 prom_sortmemlist(prom_phys_avail);
 179                 break;
 180
 181         case PROM_SUN4:
 182 #ifdef CONFIG_SUN4
 183                 /* how simple :) */
 184                 prom_phys_total[0].start_adr = NULL;
 185                 prom_phys_total[0].num_bytes = *(sun4_romvec->memorysize);
 186                 prom_phys_total[0].theres_more = NULL;
 187                 prom_prom_taken[0].start_adr = NULL;
 188                 prom_prom_taken[0].num_bytes = 0x0;
 189                 prom_prom_taken[0].theres_more = NULL;
 190                 prom_phys_avail[0].start_adr = NULL;
 191                 prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
 192                 prom_phys_avail[0].theres_more = NULL;
 193 #endif
 194                 break;
 195
 196         default:
 197                 break;
 198         };
 199
 200         /* Link all the lists into the top-level descriptor. */
 201         prom_memlist.v0_totphys=&prom_ptot_ptr;
 202         prom_memlist.v0_prommap=&prom_ptak_ptr;
 203         prom_memlist.v0_available=&prom_pavl_ptr;
 204
 205         return;
 206 }
 207
 208 /* This returns a pointer to our libraries internal v0 format
 209  * memory descriptor.
 210  */
 211 struct linux_mem_v0 *
 212 prom_meminfo(void)
 213 {
 214         return &prom_memlist;
 215 }