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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/config.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/openprom.h>
  14 #include <asm/sun4prom.h>
  15 #include <asm/oplib.h>
  16
  17 /* This routine, for consistency, returns the ram parameters in the
  18  * V0 prom memory descriptor format.  I choose this format because I
  19  * think it was the easiest to work with.  I feel the religious
  20  * arguments now... ;)  Also, I return the linked lists sorted to
  21  * prevent paging_init() upset stomach as I have not yet written
  22  * the pepto-bismol kernel module yet.
  23  */
  24
  25 struct linux_prom_registers prom_reg_memlist[64];
  26 struct linux_prom_registers prom_reg_tmp[64];
  27
  28 struct linux_mlist_v0 prom_phys_total[64];
  29 struct linux_mlist_v0 prom_prom_taken[64];
  30 struct linux_mlist_v0 prom_phys_avail[64];
  31
  32 struct linux_mlist_v0 *prom_ptot_ptr = prom_phys_total;
  33 struct linux_mlist_v0 *prom_ptak_ptr = prom_prom_taken;
  34 struct linux_mlist_v0 *prom_pavl_ptr = prom_phys_avail;
  35
  36 struct linux_mem_v0 prom_memlist;
  37
  38
  39 /* Internal Prom library routine to sort a linux_mlist_v0 memory
  40  * list.  Used below in initialization.
  41  */
  42 static void __init
  43 prom_sortmemlist(struct linux_mlist_v0 *thislist)
  44 {
  45         int swapi = 0;
  46         int i, mitr, tmpsize;
  47         char *tmpaddr;
  48         char *lowest;
  49
  50         for(i=0; thislist[i].theres_more; i++) {
  51                 lowest = thislist[i].start_adr;
  52                 for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
  53                         if(thislist[mitr].start_adr < lowest) {
  54                                 lowest = thislist[mitr].start_adr;
  55                                 swapi = mitr;
  56                         }
  57                 if(lowest == thislist[i].start_adr) continue;
  58                 tmpaddr = thislist[swapi].start_adr;
  59                 tmpsize = thislist[swapi].num_bytes;
  60                 for(mitr = swapi; mitr > i; mitr--) {
  61                         thislist[mitr].start_adr = thislist[mitr-1].start_adr;
  62                         thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
  63                 }
  64                 thislist[i].start_adr = tmpaddr;
  65                 thislist[i].num_bytes = tmpsize;
  66         }
  67
  68         return;
  69 }
  70
  71 /* Initialize the memory lists based upon the prom version. */
  72 void __init prom_meminit(void)
  73 {
  74         int node = 0;
  75         unsigned int iter, num_regs;
  76         struct linux_mlist_v0 *mptr;  /* ptr for traversal */
  77
  78         switch(prom_vers) {
  79         case PROM_V0:
  80                 /* Nice, kind of easier to do in this case. */
  81                 /* First, the total physical descriptors. */
  82                 for(mptr = (*(romvec->pv_v0mem.v0_totphys)), iter=0;
  83                     mptr; mptr=mptr->theres_more, iter++) {
  84                         prom_phys_total[iter].start_adr = mptr->start_adr;
  85                         prom_phys_total[iter].num_bytes = mptr->num_bytes;
  86                         prom_phys_total[iter].theres_more = &prom_phys_total[iter+1];
  87                 }
  88                 prom_phys_total[iter-1].theres_more = NULL;
  89                 /* Second, the total prom taken descriptors. */
  90                 for(mptr = (*(romvec->pv_v0mem.v0_prommap)), iter=0;
  91                     mptr; mptr=mptr->theres_more, iter++) {
  92                         prom_prom_taken[iter].start_adr = mptr->start_adr;
  93                         prom_prom_taken[iter].num_bytes = mptr->num_bytes;
  94                         prom_prom_taken[iter].theres_more = &prom_prom_taken[iter+1];
  95                 }
  96                 prom_prom_taken[iter-1].theres_more = NULL;
  97                 /* Last, the available physical descriptors. */
  98                 for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0;
  99                     mptr; mptr=mptr->theres_more, iter++) {
 100                         prom_phys_avail[iter].start_adr = mptr->start_adr;
 101                         prom_phys_avail[iter].num_bytes = mptr->num_bytes;
 102                         prom_phys_avail[iter].theres_more = &prom_phys_avail[iter+1];
 103                 }
 104                 prom_phys_avail[iter-1].theres_more = NULL;
 105                 /* Sort all the lists. */
 106                 prom_sortmemlist(prom_phys_total);
 107                 prom_sortmemlist(prom_prom_taken);
 108                 prom_sortmemlist(prom_phys_avail);
 109                 break;
 110         case PROM_V2:
 111         case PROM_V3:
 112                 /* Grrr, have to traverse the prom device tree ;( */
 113                 node = prom_getchild(prom_root_node);
 114                 node = prom_searchsiblings(node, "memory");
 115                 num_regs = prom_getproperty(node, "available",
 116                                             (char *) prom_reg_memlist,
 117                                             sizeof(prom_reg_memlist));
 118                 num_regs = (num_regs/sizeof(struct linux_prom_registers));
 119                 for(iter=0; iter<num_regs; iter++) {
 120                         prom_phys_avail[iter].start_adr =
 121                                 (char *) prom_reg_memlist[iter].phys_addr;
 122                         prom_phys_avail[iter].num_bytes =
 123                                 (unsigned long) prom_reg_memlist[iter].reg_size;
 124                         prom_phys_avail[iter].theres_more =
 125                                 &prom_phys_avail[iter+1];
 126                 }
 127                 prom_phys_avail[iter-1].theres_more = NULL;
 128
 129                 num_regs = prom_getproperty(node, "reg",
 130                                             (char *) prom_reg_memlist,
 131                                             sizeof(prom_reg_memlist));
 132                 num_regs = (num_regs/sizeof(struct linux_prom_registers));
 133                 for(iter=0; iter<num_regs; iter++) {
 134                         prom_phys_total[iter].start_adr =
 135                                 (char *) prom_reg_memlist[iter].phys_addr;
 136                         prom_phys_total[iter].num_bytes =
 137                                 (unsigned long) prom_reg_memlist[iter].reg_size;
 138                         prom_phys_total[iter].theres_more =
 139                                 &prom_phys_total[iter+1];
 140                 }
 141                 prom_phys_total[iter-1].theres_more = NULL;
 142
 143                 node = prom_getchild(prom_root_node);
 144                 node = prom_searchsiblings(node, "virtual-memory");
 145                 num_regs = prom_getproperty(node, "available",
 146                                             (char *) prom_reg_memlist,
 147                                             sizeof(prom_reg_memlist));
 148                 num_regs = (num_regs/sizeof(struct linux_prom_registers));
 149
 150                 /* Convert available virtual areas to taken virtual
 151                  * areas.  First sort, then convert.
 152                  */
 153                 for(iter=0; iter<num_regs; iter++) {
 154                         prom_prom_taken[iter].start_adr =
 155                                 (char *) prom_reg_memlist[iter].phys_addr;
 156                         prom_prom_taken[iter].num_bytes =
 157                                 (unsigned long) prom_reg_memlist[iter].reg_size;
 158                         prom_prom_taken[iter].theres_more =
 159                                 &prom_prom_taken[iter+1];
 160                 }
 161                 prom_prom_taken[iter-1].theres_more = NULL;
 162
 163                 prom_sortmemlist(prom_prom_taken);
 164
 165                 /* Finally, convert. */
 166                 for(iter=0; iter<num_regs; iter++) {
 167                         prom_prom_taken[iter].start_adr =
 168                                 prom_prom_taken[iter].start_adr +
 169                                         prom_prom_taken[iter].num_bytes;
 170                         prom_prom_taken[iter].num_bytes =
 171                                 prom_prom_taken[iter+1].start_adr -
 172                                         prom_prom_taken[iter].start_adr;
 173                 }
 174                 prom_prom_taken[iter-1].num_bytes =
 175                         0xffffffff - (unsigned long) prom_prom_taken[iter-1].start_adr;
 176
 177                 /* Sort the other two lists. */
 178                 prom_sortmemlist(prom_phys_total);
 179                 prom_sortmemlist(prom_phys_avail);
 180                 break;
 181
 182         case PROM_SUN4:
 183 #ifdef CONFIG_SUN4
 184                 /* how simple :) */
 185                 prom_phys_total[0].start_adr = NULL;
 186                 prom_phys_total[0].num_bytes = *(sun4_romvec->memorysize);
 187                 prom_phys_total[0].theres_more = NULL;
 188                 prom_prom_taken[0].start_adr = NULL;
 189                 prom_prom_taken[0].num_bytes = 0x0;
 190                 prom_prom_taken[0].theres_more = NULL;
 191                 prom_phys_avail[0].start_adr = NULL;
 192                 prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
 193                 prom_phys_avail[0].theres_more = NULL;
 194 #endif
 195                 break;
 196
 197         default:
 198                 break;
 199         };
 200
 201         /* Link all the lists into the top-level descriptor. */
 202         prom_memlist.v0_totphys=&prom_ptot_ptr;
 203         prom_memlist.v0_prommap=&prom_ptak_ptr;
 204         prom_memlist.v0_available=&prom_pavl_ptr;
 205
 206         return;
 207 }
 208
 209 /* This returns a pointer to our libraries internal v0 format
 210  * memory descriptor.
 211  */
 212 struct linux_mem_v0 *
 213 prom_meminfo(void)
 214 {
 215         return &prom_memlist;
 216 }