6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
216 lines
6.8 KiB
C
216 lines
6.8 KiB
C
/* $Id: memory.c,v 1.15 2000/01/29 01:09:12 anton Exp $
|
|
* memory.c: Prom routine for acquiring various bits of information
|
|
* about RAM on the machine, both virtual and physical.
|
|
*
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
|
* Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/openprom.h>
|
|
#include <asm/sun4prom.h>
|
|
#include <asm/oplib.h>
|
|
|
|
/* This routine, for consistency, returns the ram parameters in the
|
|
* V0 prom memory descriptor format. I choose this format because I
|
|
* think it was the easiest to work with. I feel the religious
|
|
* arguments now... ;) Also, I return the linked lists sorted to
|
|
* prevent paging_init() upset stomach as I have not yet written
|
|
* the pepto-bismol kernel module yet.
|
|
*/
|
|
|
|
struct linux_prom_registers prom_reg_memlist[64];
|
|
struct linux_prom_registers prom_reg_tmp[64];
|
|
|
|
struct linux_mlist_v0 prom_phys_total[64];
|
|
struct linux_mlist_v0 prom_prom_taken[64];
|
|
struct linux_mlist_v0 prom_phys_avail[64];
|
|
|
|
struct linux_mlist_v0 *prom_ptot_ptr = prom_phys_total;
|
|
struct linux_mlist_v0 *prom_ptak_ptr = prom_prom_taken;
|
|
struct linux_mlist_v0 *prom_pavl_ptr = prom_phys_avail;
|
|
|
|
struct linux_mem_v0 prom_memlist;
|
|
|
|
|
|
/* Internal Prom library routine to sort a linux_mlist_v0 memory
|
|
* list. Used below in initialization.
|
|
*/
|
|
static void __init
|
|
prom_sortmemlist(struct linux_mlist_v0 *thislist)
|
|
{
|
|
int swapi = 0;
|
|
int i, mitr, tmpsize;
|
|
char *tmpaddr;
|
|
char *lowest;
|
|
|
|
for(i=0; thislist[i].theres_more; i++) {
|
|
lowest = thislist[i].start_adr;
|
|
for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
|
|
if(thislist[mitr].start_adr < lowest) {
|
|
lowest = thislist[mitr].start_adr;
|
|
swapi = mitr;
|
|
}
|
|
if(lowest == thislist[i].start_adr) continue;
|
|
tmpaddr = thislist[swapi].start_adr;
|
|
tmpsize = thislist[swapi].num_bytes;
|
|
for(mitr = swapi; mitr > i; mitr--) {
|
|
thislist[mitr].start_adr = thislist[mitr-1].start_adr;
|
|
thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
|
|
}
|
|
thislist[i].start_adr = tmpaddr;
|
|
thislist[i].num_bytes = tmpsize;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* Initialize the memory lists based upon the prom version. */
|
|
void __init prom_meminit(void)
|
|
{
|
|
int node = 0;
|
|
unsigned int iter, num_regs;
|
|
struct linux_mlist_v0 *mptr; /* ptr for traversal */
|
|
|
|
switch(prom_vers) {
|
|
case PROM_V0:
|
|
/* Nice, kind of easier to do in this case. */
|
|
/* First, the total physical descriptors. */
|
|
for(mptr = (*(romvec->pv_v0mem.v0_totphys)), iter=0;
|
|
mptr; mptr=mptr->theres_more, iter++) {
|
|
prom_phys_total[iter].start_adr = mptr->start_adr;
|
|
prom_phys_total[iter].num_bytes = mptr->num_bytes;
|
|
prom_phys_total[iter].theres_more = &prom_phys_total[iter+1];
|
|
}
|
|
prom_phys_total[iter-1].theres_more = NULL;
|
|
/* Second, the total prom taken descriptors. */
|
|
for(mptr = (*(romvec->pv_v0mem.v0_prommap)), iter=0;
|
|
mptr; mptr=mptr->theres_more, iter++) {
|
|
prom_prom_taken[iter].start_adr = mptr->start_adr;
|
|
prom_prom_taken[iter].num_bytes = mptr->num_bytes;
|
|
prom_prom_taken[iter].theres_more = &prom_prom_taken[iter+1];
|
|
}
|
|
prom_prom_taken[iter-1].theres_more = NULL;
|
|
/* Last, the available physical descriptors. */
|
|
for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0;
|
|
mptr; mptr=mptr->theres_more, iter++) {
|
|
prom_phys_avail[iter].start_adr = mptr->start_adr;
|
|
prom_phys_avail[iter].num_bytes = mptr->num_bytes;
|
|
prom_phys_avail[iter].theres_more = &prom_phys_avail[iter+1];
|
|
}
|
|
prom_phys_avail[iter-1].theres_more = NULL;
|
|
/* Sort all the lists. */
|
|
prom_sortmemlist(prom_phys_total);
|
|
prom_sortmemlist(prom_prom_taken);
|
|
prom_sortmemlist(prom_phys_avail);
|
|
break;
|
|
case PROM_V2:
|
|
case PROM_V3:
|
|
/* Grrr, have to traverse the prom device tree ;( */
|
|
node = prom_getchild(prom_root_node);
|
|
node = prom_searchsiblings(node, "memory");
|
|
num_regs = prom_getproperty(node, "available",
|
|
(char *) prom_reg_memlist,
|
|
sizeof(prom_reg_memlist));
|
|
num_regs = (num_regs/sizeof(struct linux_prom_registers));
|
|
for(iter=0; iter<num_regs; iter++) {
|
|
prom_phys_avail[iter].start_adr =
|
|
(char *) prom_reg_memlist[iter].phys_addr;
|
|
prom_phys_avail[iter].num_bytes =
|
|
(unsigned long) prom_reg_memlist[iter].reg_size;
|
|
prom_phys_avail[iter].theres_more =
|
|
&prom_phys_avail[iter+1];
|
|
}
|
|
prom_phys_avail[iter-1].theres_more = NULL;
|
|
|
|
num_regs = prom_getproperty(node, "reg",
|
|
(char *) prom_reg_memlist,
|
|
sizeof(prom_reg_memlist));
|
|
num_regs = (num_regs/sizeof(struct linux_prom_registers));
|
|
for(iter=0; iter<num_regs; iter++) {
|
|
prom_phys_total[iter].start_adr =
|
|
(char *) prom_reg_memlist[iter].phys_addr;
|
|
prom_phys_total[iter].num_bytes =
|
|
(unsigned long) prom_reg_memlist[iter].reg_size;
|
|
prom_phys_total[iter].theres_more =
|
|
&prom_phys_total[iter+1];
|
|
}
|
|
prom_phys_total[iter-1].theres_more = NULL;
|
|
|
|
node = prom_getchild(prom_root_node);
|
|
node = prom_searchsiblings(node, "virtual-memory");
|
|
num_regs = prom_getproperty(node, "available",
|
|
(char *) prom_reg_memlist,
|
|
sizeof(prom_reg_memlist));
|
|
num_regs = (num_regs/sizeof(struct linux_prom_registers));
|
|
|
|
/* Convert available virtual areas to taken virtual
|
|
* areas. First sort, then convert.
|
|
*/
|
|
for(iter=0; iter<num_regs; iter++) {
|
|
prom_prom_taken[iter].start_adr =
|
|
(char *) prom_reg_memlist[iter].phys_addr;
|
|
prom_prom_taken[iter].num_bytes =
|
|
(unsigned long) prom_reg_memlist[iter].reg_size;
|
|
prom_prom_taken[iter].theres_more =
|
|
&prom_prom_taken[iter+1];
|
|
}
|
|
prom_prom_taken[iter-1].theres_more = NULL;
|
|
|
|
prom_sortmemlist(prom_prom_taken);
|
|
|
|
/* Finally, convert. */
|
|
for(iter=0; iter<num_regs; iter++) {
|
|
prom_prom_taken[iter].start_adr =
|
|
prom_prom_taken[iter].start_adr +
|
|
prom_prom_taken[iter].num_bytes;
|
|
prom_prom_taken[iter].num_bytes =
|
|
prom_prom_taken[iter+1].start_adr -
|
|
prom_prom_taken[iter].start_adr;
|
|
}
|
|
prom_prom_taken[iter-1].num_bytes =
|
|
0xffffffff - (unsigned long) prom_prom_taken[iter-1].start_adr;
|
|
|
|
/* Sort the other two lists. */
|
|
prom_sortmemlist(prom_phys_total);
|
|
prom_sortmemlist(prom_phys_avail);
|
|
break;
|
|
|
|
case PROM_SUN4:
|
|
#ifdef CONFIG_SUN4
|
|
/* how simple :) */
|
|
prom_phys_total[0].start_adr = NULL;
|
|
prom_phys_total[0].num_bytes = *(sun4_romvec->memorysize);
|
|
prom_phys_total[0].theres_more = NULL;
|
|
prom_prom_taken[0].start_adr = NULL;
|
|
prom_prom_taken[0].num_bytes = 0x0;
|
|
prom_prom_taken[0].theres_more = NULL;
|
|
prom_phys_avail[0].start_adr = NULL;
|
|
prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
|
|
prom_phys_avail[0].theres_more = NULL;
|
|
#endif
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
};
|
|
|
|
/* Link all the lists into the top-level descriptor. */
|
|
prom_memlist.v0_totphys=&prom_ptot_ptr;
|
|
prom_memlist.v0_prommap=&prom_ptak_ptr;
|
|
prom_memlist.v0_available=&prom_pavl_ptr;
|
|
|
|
return;
|
|
}
|
|
|
|
/* This returns a pointer to our libraries internal v0 format
|
|
* memory descriptor.
|
|
*/
|
|
struct linux_mem_v0 *
|
|
prom_meminfo(void)
|
|
{
|
|
return &prom_memlist;
|
|
}
|