89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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, 2008 David S. Miller (davem@davemloft.net)
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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/sort.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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#include <asm/page.h>
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static int __init prom_meminit_v0(void)
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{
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struct linux_mlist_v0 *p;
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int index;
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index = 0;
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for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
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sp_banks[index].base_addr = (unsigned long) p->start_adr;
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sp_banks[index].num_bytes = p->num_bytes;
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index++;
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}
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return index;
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}
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static int __init prom_meminit_v2(void)
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{
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struct linux_prom_registers reg[64];
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phandle node;
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int size, num_ents, i;
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node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
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size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
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num_ents = size / sizeof(struct linux_prom_registers);
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for (i = 0; i < num_ents; i++) {
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sp_banks[i].base_addr = reg[i].phys_addr;
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sp_banks[i].num_bytes = reg[i].reg_size;
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}
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return num_ents;
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}
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static int sp_banks_cmp(const void *a, const void *b)
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{
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const struct sparc_phys_banks *x = a, *y = b;
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if (x->base_addr > y->base_addr)
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return 1;
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if (x->base_addr < y->base_addr)
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return -1;
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return 0;
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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 i, num_ents = 0;
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switch (prom_vers) {
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case PROM_V0:
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num_ents = prom_meminit_v0();
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break;
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case PROM_V2:
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case PROM_V3:
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num_ents = prom_meminit_v2();
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break;
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default:
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break;
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}
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sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
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sp_banks_cmp, NULL);
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/* Sentinel. */
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sp_banks[num_ents].base_addr = 0xdeadbeef;
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sp_banks[num_ents].num_bytes = 0;
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for (i = 0; i < num_ents; i++)
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sp_banks[i].num_bytes &= PAGE_MASK;
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}
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