1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/* $Id: memory.c,v 1.5 1999/08/31 06:55:04 davem Exp $
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* memory.c: Prom routine for acquiring various bits of information
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* about RAM on the machine, both virtual and physical.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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/* This routine, for consistency, returns the ram parameters in the
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* V0 prom memory descriptor format. I choose this format because I
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* think it was the easiest to work with. I feel the religious
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* arguments now... ;) Also, I return the linked lists sorted to
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* prevent paging_init() upset stomach as I have not yet written
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* the pepto-bismol kernel module yet.
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*/
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struct linux_prom64_registers prom_reg_memlist[64];
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struct linux_prom64_registers prom_reg_tmp[64];
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struct linux_mlist_p1275 prom_phys_total[64];
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struct linux_mlist_p1275 prom_prom_taken[64];
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struct linux_mlist_p1275 prom_phys_avail[64];
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struct linux_mlist_p1275 *prom_ptot_ptr = prom_phys_total;
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struct linux_mlist_p1275 *prom_ptak_ptr = prom_prom_taken;
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struct linux_mlist_p1275 *prom_pavl_ptr = prom_phys_avail;
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struct linux_mem_p1275 prom_memlist;
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/* Internal Prom library routine to sort a linux_mlist_p1275 memory
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* list. Used below in initialization.
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*/
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static void __init
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prom_sortmemlist(struct linux_mlist_p1275 *thislist)
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{
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int swapi = 0;
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int i, mitr;
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unsigned long tmpaddr, tmpsize;
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unsigned long lowest;
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for(i=0; thislist[i].theres_more; i++) {
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lowest = thislist[i].start_adr;
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for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
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if(thislist[mitr].start_adr < lowest) {
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lowest = thislist[mitr].start_adr;
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swapi = mitr;
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}
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if(lowest == thislist[i].start_adr) continue;
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tmpaddr = thislist[swapi].start_adr;
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tmpsize = thislist[swapi].num_bytes;
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for(mitr = swapi; mitr > i; mitr--) {
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thislist[mitr].start_adr = thislist[mitr-1].start_adr;
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thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
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}
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thislist[i].start_adr = tmpaddr;
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thislist[i].num_bytes = tmpsize;
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}
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}
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/* Initialize the memory lists based upon the prom version. */
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void __init prom_meminit(void)
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{
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int node = 0;
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unsigned int iter, num_regs;
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node = prom_finddevice("/memory");
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num_regs = prom_getproperty(node, "available",
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(char *) prom_reg_memlist,
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sizeof(prom_reg_memlist));
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num_regs = (num_regs/sizeof(struct linux_prom64_registers));
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for(iter=0; iter<num_regs; iter++) {
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prom_phys_avail[iter].start_adr =
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prom_reg_memlist[iter].phys_addr;
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prom_phys_avail[iter].num_bytes =
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prom_reg_memlist[iter].reg_size;
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prom_phys_avail[iter].theres_more =
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&prom_phys_avail[iter+1];
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}
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prom_phys_avail[iter-1].theres_more = NULL;
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num_regs = prom_getproperty(node, "reg",
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(char *) prom_reg_memlist,
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sizeof(prom_reg_memlist));
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num_regs = (num_regs/sizeof(struct linux_prom64_registers));
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for(iter=0; iter<num_regs; iter++) {
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prom_phys_total[iter].start_adr =
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prom_reg_memlist[iter].phys_addr;
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prom_phys_total[iter].num_bytes =
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prom_reg_memlist[iter].reg_size;
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prom_phys_total[iter].theres_more =
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&prom_phys_total[iter+1];
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}
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prom_phys_total[iter-1].theres_more = NULL;
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node = prom_finddevice("/virtual-memory");
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num_regs = prom_getproperty(node, "available",
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(char *) prom_reg_memlist,
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sizeof(prom_reg_memlist));
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num_regs = (num_regs/sizeof(struct linux_prom64_registers));
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/* Convert available virtual areas to taken virtual
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* areas. First sort, then convert.
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*/
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for(iter=0; iter<num_regs; iter++) {
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prom_prom_taken[iter].start_adr =
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prom_reg_memlist[iter].phys_addr;
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prom_prom_taken[iter].num_bytes =
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prom_reg_memlist[iter].reg_size;
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prom_prom_taken[iter].theres_more =
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&prom_prom_taken[iter+1];
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}
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prom_prom_taken[iter-1].theres_more = NULL;
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prom_sortmemlist(prom_prom_taken);
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/* Finally, convert. */
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for(iter=0; iter<num_regs; iter++) {
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prom_prom_taken[iter].start_adr =
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prom_prom_taken[iter].start_adr +
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prom_prom_taken[iter].num_bytes;
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prom_prom_taken[iter].num_bytes =
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prom_prom_taken[iter+1].start_adr -
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prom_prom_taken[iter].start_adr;
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}
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prom_prom_taken[iter-1].num_bytes =
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-1UL - prom_prom_taken[iter-1].start_adr;
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/* Sort the other two lists. */
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prom_sortmemlist(prom_phys_total);
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prom_sortmemlist(prom_phys_avail);
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/* Link all the lists into the top-level descriptor. */
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prom_memlist.p1275_totphys=&prom_ptot_ptr;
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prom_memlist.p1275_prommap=&prom_ptak_ptr;
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prom_memlist.p1275_available=&prom_pavl_ptr;
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}
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/* This returns a pointer to our libraries internal p1275 format
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* memory descriptor.
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*/
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struct linux_mem_p1275 *
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prom_meminfo(void)
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{
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return &prom_memlist;
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}
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