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// SPDX-License-Identifier: GPL-2.0
/* 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];
phandle node;
int 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;
}
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