arch/sparc64/prom/memory.c

   1 /* $Id: memory.c,v 1.5 1999/08/31 06:55:04 davem 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 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14
  15 /* This routine, for consistency, returns the ram parameters in the
  16  * V0 prom memory descriptor format.  I choose this format because I
  17  * think it was the easiest to work with.  I feel the religious
  18  * arguments now... ;)  Also, I return the linked lists sorted to
  19  * prevent paging_init() upset stomach as I have not yet written
  20  * the pepto-bismol kernel module yet.
  21  */
  22
  23 struct linux_prom64_registers prom_reg_memlist[64];
  24 struct linux_prom64_registers prom_reg_tmp[64];
  25
  26 struct linux_mlist_p1275 prom_phys_total[64];
  27 struct linux_mlist_p1275 prom_prom_taken[64];
  28 struct linux_mlist_p1275 prom_phys_avail[64];
  29
  30 struct linux_mlist_p1275 *prom_ptot_ptr = prom_phys_total;
  31 struct linux_mlist_p1275 *prom_ptak_ptr = prom_prom_taken;
  32 struct linux_mlist_p1275 *prom_pavl_ptr = prom_phys_avail;
  33
  34 struct linux_mem_p1275 prom_memlist;
  35
  36
  37 /* Internal Prom library routine to sort a linux_mlist_p1275 memory
  38  * list.  Used below in initialization.
  39  */
  40 static void __init
  41 prom_sortmemlist(struct linux_mlist_p1275 *thislist)
  42 {
  43         int swapi = 0;
  44         int i, mitr;
  45         unsigned long tmpaddr, tmpsize;
  46         unsigned long lowest;
  47
  48         for(i=0; thislist[i].theres_more; i++) {
  49                 lowest = thislist[i].start_adr;
  50                 for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
  51                         if(thislist[mitr].start_adr < lowest) {
  52                                 lowest = thislist[mitr].start_adr;
  53                                 swapi = mitr;
  54                         }
  55                 if(lowest == thislist[i].start_adr) continue;
  56                 tmpaddr = thislist[swapi].start_adr;
  57                 tmpsize = thislist[swapi].num_bytes;
  58                 for(mitr = swapi; mitr > i; mitr--) {
  59                         thislist[mitr].start_adr = thislist[mitr-1].start_adr;
  60                         thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
  61                 }
  62                 thislist[i].start_adr = tmpaddr;
  63                 thislist[i].num_bytes = tmpsize;
  64         }
  65 }
  66
  67 /* Initialize the memory lists based upon the prom version. */
  68 void __init prom_meminit(void)
  69 {
  70         int node = 0;
  71         unsigned int iter, num_regs;
  72
  73         node = prom_finddevice("/memory");
  74         num_regs = prom_getproperty(node, "available",
  75                                     (char *) prom_reg_memlist,
  76                                     sizeof(prom_reg_memlist));
  77         num_regs = (num_regs/sizeof(struct linux_prom64_registers));
  78         for(iter=0; iter<num_regs; iter++) {
  79                 prom_phys_avail[iter].start_adr =
  80                         prom_reg_memlist[iter].phys_addr;
  81                 prom_phys_avail[iter].num_bytes =
  82                         prom_reg_memlist[iter].reg_size;
  83                 prom_phys_avail[iter].theres_more =
  84                         &prom_phys_avail[iter+1];
  85         }
  86         prom_phys_avail[iter-1].theres_more = NULL;
  87
  88         num_regs = prom_getproperty(node, "reg",
  89                                     (char *) prom_reg_memlist,
  90                                     sizeof(prom_reg_memlist));
  91         num_regs = (num_regs/sizeof(struct linux_prom64_registers));
  92         for(iter=0; iter<num_regs; iter++) {
  93                 prom_phys_total[iter].start_adr =
  94                         prom_reg_memlist[iter].phys_addr;
  95                 prom_phys_total[iter].num_bytes =
  96                         prom_reg_memlist[iter].reg_size;
  97                 prom_phys_total[iter].theres_more =
  98                         &prom_phys_total[iter+1];
  99         }
 100         prom_phys_total[iter-1].theres_more = NULL;
 101
 102         node = prom_finddevice("/virtual-memory");
 103         num_regs = prom_getproperty(node, "available",
 104                                     (char *) prom_reg_memlist,
 105                                     sizeof(prom_reg_memlist));
 106         num_regs = (num_regs/sizeof(struct linux_prom64_registers));
 107
 108         /* Convert available virtual areas to taken virtual
 109          * areas.  First sort, then convert.
 110          */
 111         for(iter=0; iter<num_regs; iter++) {
 112                 prom_prom_taken[iter].start_adr =
 113                         prom_reg_memlist[iter].phys_addr;
 114                 prom_prom_taken[iter].num_bytes =
 115                         prom_reg_memlist[iter].reg_size;
 116                 prom_prom_taken[iter].theres_more =
 117                         &prom_prom_taken[iter+1];
 118         }
 119         prom_prom_taken[iter-1].theres_more = NULL;
 120
 121         prom_sortmemlist(prom_prom_taken);
 122
 123         /* Finally, convert. */
 124         for(iter=0; iter<num_regs; iter++) {
 125                 prom_prom_taken[iter].start_adr =
 126                         prom_prom_taken[iter].start_adr +
 127                         prom_prom_taken[iter].num_bytes;
 128                 prom_prom_taken[iter].num_bytes =
 129                         prom_prom_taken[iter+1].start_adr -
 130                         prom_prom_taken[iter].start_adr;
 131         }
 132         prom_prom_taken[iter-1].num_bytes =
 133                 -1UL - prom_prom_taken[iter-1].start_adr;
 134
 135         /* Sort the other two lists. */
 136         prom_sortmemlist(prom_phys_total);
 137         prom_sortmemlist(prom_phys_avail);
 138
 139         /* Link all the lists into the top-level descriptor. */
 140         prom_memlist.p1275_totphys=&prom_ptot_ptr;
 141         prom_memlist.p1275_prommap=&prom_ptak_ptr;
 142         prom_memlist.p1275_available=&prom_pavl_ptr;
 143 }
 144
 145 /* This returns a pointer to our libraries internal p1275 format
 146  * memory descriptor.
 147  */
 148 struct linux_mem_p1275 *
 149 prom_meminfo(void)
 150 {
 151         return &prom_memlist;
 152 }