mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
5110bd21b8
While doing some easy cleanups on the sparc code I noticed that the CONFIG_SUN4 code seems to be worse than the rest - there were some "I don't know how it should work, but the current code definitely cannot work." places. And while I have seen people running Linux on machines like a SPARCstation 5 a few years ago I don't recall having seen sun4 machines, even less ones running Linux. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/* memory.c: Prom routine for acquiring various bits of information
|
|
* about RAM on the machine, both virtual and physical.
|
|
*
|
|
* Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
|
|
* Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sort.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/openprom.h>
|
|
#include <asm/oplib.h>
|
|
#include <asm/page.h>
|
|
|
|
static int __init prom_meminit_v0(void)
|
|
{
|
|
struct linux_mlist_v0 *p;
|
|
int index;
|
|
|
|
index = 0;
|
|
for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
|
|
sp_banks[index].base_addr = (unsigned long) p->start_adr;
|
|
sp_banks[index].num_bytes = p->num_bytes;
|
|
index++;
|
|
}
|
|
|
|
return index;
|
|
}
|
|
|
|
static int __init prom_meminit_v2(void)
|
|
{
|
|
struct linux_prom_registers reg[64];
|
|
int node, size, num_ents, i;
|
|
|
|
node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
|
|
size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
|
|
num_ents = size / sizeof(struct linux_prom_registers);
|
|
|
|
for (i = 0; i < num_ents; i++) {
|
|
sp_banks[i].base_addr = reg[i].phys_addr;
|
|
sp_banks[i].num_bytes = reg[i].reg_size;
|
|
}
|
|
|
|
return num_ents;
|
|
}
|
|
|
|
static int sp_banks_cmp(const void *a, const void *b)
|
|
{
|
|
const struct sparc_phys_banks *x = a, *y = b;
|
|
|
|
if (x->base_addr > y->base_addr)
|
|
return 1;
|
|
if (x->base_addr < y->base_addr)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize the memory lists based upon the prom version. */
|
|
void __init prom_meminit(void)
|
|
{
|
|
int i, num_ents = 0;
|
|
|
|
switch (prom_vers) {
|
|
case PROM_V0:
|
|
num_ents = prom_meminit_v0();
|
|
break;
|
|
|
|
case PROM_V2:
|
|
case PROM_V3:
|
|
num_ents = prom_meminit_v2();
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
|
|
sp_banks_cmp, NULL);
|
|
|
|
/* Sentinel. */
|
|
sp_banks[num_ents].base_addr = 0xdeadbeef;
|
|
sp_banks[num_ents].num_bytes = 0;
|
|
|
|
for (i = 0; i < num_ents; i++)
|
|
sp_banks[i].num_bytes &= PAGE_MASK;
|
|
}
|