1/* memory.c: Prom routine for acquiring various bits of information 2 * about RAM on the machine, both virtual and physical. 3 * 4 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) 5 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org) 6 */ 7 8#include <linux/kernel.h> 9#include <linux/sort.h> 10#include <linux/init.h> 11 12#include <asm/openprom.h> 13#include <asm/oplib.h> 14#include <asm/page.h> 15 16static int __init prom_meminit_v0(void) 17{ 18 struct linux_mlist_v0 *p; 19 int index; 20 21 index = 0; 22 for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) { 23 sp_banks[index].base_addr = (unsigned long) p->start_adr; 24 sp_banks[index].num_bytes = p->num_bytes; 25 index++; 26 } 27 28 return index; 29} 30 31static int __init prom_meminit_v2(void) 32{ 33 struct linux_prom_registers reg[64]; 34 int node, size, num_ents, i; 35 36 node = prom_searchsiblings(prom_getchild(prom_root_node), "memory"); 37 size = prom_getproperty(node, "available", (char *) reg, sizeof(reg)); 38 num_ents = size / sizeof(struct linux_prom_registers); 39 40 for (i = 0; i < num_ents; i++) { 41 sp_banks[i].base_addr = reg[i].phys_addr; 42 sp_banks[i].num_bytes = reg[i].reg_size; 43 } 44 45 return num_ents; 46} 47 48static int sp_banks_cmp(const void *a, const void *b) 49{ 50 const struct sparc_phys_banks *x = a, *y = b; 51 52 if (x->base_addr > y->base_addr) 53 return 1; 54 if (x->base_addr < y->base_addr) 55 return -1; 56 return 0; 57} 58 59/* Initialize the memory lists based upon the prom version. */ 60void __init prom_meminit(void) 61{ 62 int i, num_ents = 0; 63 64 switch (prom_vers) { 65 case PROM_V0: 66 num_ents = prom_meminit_v0(); 67 break; 68 69 case PROM_V2: 70 case PROM_V3: 71 num_ents = prom_meminit_v2(); 72 break; 73 74 default: 75 break; 76 } 77 sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), 78 sp_banks_cmp, NULL); 79 80 /* Sentinel. */ 81 sp_banks[num_ents].base_addr = 0xdeadbeef; 82 sp_banks[num_ents].num_bytes = 0; 83 84 for (i = 0; i < num_ents; i++) 85 sp_banks[i].num_bytes &= PAGE_MASK; 86} 87