ccc34028d4
The code in arch/sparc/prom/memory.c computes three tables, the list of total memory, the list of available memory (total minus what firmware is using), and the list of firmware taken memory. Only the available memory list is even used. Therefore, kill those unused tables and make prom_meminfo() return just the available memory list. Signed-off-by: David S. Miller <davem@davemloft.net>
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/* 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 Michael A. Griffith (grif@acm.org)
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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/sun4prom.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_prom_registers prom_reg_memlist[64];
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struct linux_mlist_v0 prom_phys_avail[64];
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/* Internal Prom library routine to sort a linux_mlist_v0 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_v0 *thislist)
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{
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int swapi = 0;
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int i, mitr, tmpsize;
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char *tmpaddr;
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char *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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return;
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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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struct linux_mlist_v0 *mptr; /* ptr for traversal */
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switch(prom_vers) {
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case PROM_V0:
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/* Nice, kind of easier to do in this case. */
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for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0;
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mptr; mptr=mptr->theres_more, iter++) {
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prom_phys_avail[iter].start_adr = mptr->start_adr;
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prom_phys_avail[iter].num_bytes = mptr->num_bytes;
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prom_phys_avail[iter].theres_more = &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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prom_sortmemlist(prom_phys_avail);
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break;
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case PROM_V2:
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case PROM_V3:
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/* Grrr, have to traverse the prom device tree ;( */
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node = prom_getchild(prom_root_node);
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node = prom_searchsiblings(node, "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_prom_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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(char *) prom_reg_memlist[iter].phys_addr;
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prom_phys_avail[iter].num_bytes =
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(unsigned long) 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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prom_sortmemlist(prom_phys_avail);
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break;
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case PROM_SUN4:
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#ifdef CONFIG_SUN4
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/* how simple :) */
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prom_phys_avail[0].start_adr = NULL;
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prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
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prom_phys_avail[0].theres_more = NULL;
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#endif
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break;
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default:
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break;
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};
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}
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/* This returns a pointer to our libraries internal v0 format
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* available memory list.
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*/
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struct linux_mlist_v0 *
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prom_meminfo(void)
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{
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return prom_phys_avail;
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}
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