1 /* memory.c: Prom routine for acquiring various bits of information
2 * about RAM on the machine, both virtual and physical.
4 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
8 #include <linux/kernel.h>
9 #include <linux/sort.h>
10 #include <linux/init.h>
12 #include <asm/openprom.h>
13 #include <asm/sun4prom.h>
14 #include <asm/oplib.h>
17 static int __init prom_meminit_v0(void)
19 struct linux_mlist_v0 *p;
23 for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
24 sp_banks[index].base_addr = (unsigned long) p->start_adr;
25 sp_banks[index].num_bytes = p->num_bytes;
32 static int __init prom_meminit_v2(void)
34 struct linux_prom_registers reg[64];
35 int node, size, num_ents, i;
37 node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
38 size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
39 num_ents = size / sizeof(struct linux_prom_registers);
41 for (i = 0; i < num_ents; i++) {
42 sp_banks[i].base_addr = reg[i].phys_addr;
43 sp_banks[i].num_bytes = reg[i].reg_size;
49 static int __init prom_meminit_sun4(void)
52 sp_banks[0].base_addr = 0;
53 sp_banks[0].num_bytes = *(sun4_romvec->memoryavail);
58 static int sp_banks_cmp(const void *a, const void *b)
60 const struct sparc_phys_banks *x = a, *y = b;
62 if (x->base_addr > y->base_addr)
64 if (x->base_addr < y->base_addr)
69 /* Initialize the memory lists based upon the prom version. */
70 void __init prom_meminit(void)
76 num_ents = prom_meminit_v0();
81 num_ents = prom_meminit_v2();
85 num_ents = prom_meminit_sun4();
91 sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
95 sp_banks[num_ents].base_addr = 0xdeadbeef;
96 sp_banks[num_ents].num_bytes = 0;
98 for (i = 0; i < num_ents; i++)
99 sp_banks[i].num_bytes &= PAGE_MASK;