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 16 static 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 31 static int __init prom_meminit_v2(void) 32 { 33 struct linux_prom_registers reg[64]; 34 phandle node; 35 int size, num_ents, i; 36 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); 40 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; 44 } 45 46 return num_ents; 47 } 48 49 static int sp_banks_cmp(const void *a, const void *b) 50 { 51 const struct sparc_phys_banks *x = a, *y = b; 52 53 if (x->base_addr > y->base_addr) 54 return 1; 55 if (x->base_addr < y->base_addr) 56 return -1; 57 return 0; 58 } 59 60 /* Initialize the memory lists based upon the prom version. */ 61 void __init prom_meminit(void) 62 { 63 int i, num_ents = 0; 64 65 switch (prom_vers) { 66 case PROM_V0: 67 num_ents = prom_meminit_v0(); 68 break; 69 70 case PROM_V2: 71 case PROM_V3: 72 num_ents = prom_meminit_v2(); 73 break; 74 75 default: 76 break; 77 } 78 sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), 79 sp_banks_cmp, NULL); 80 81 /* Sentinel. */ 82 sp_banks[num_ents].base_addr = 0xdeadbeef; 83 sp_banks[num_ents].num_bytes = 0; 84 85 for (i = 0; i < num_ents; i++) 86 sp_banks[i].num_bytes &= PAGE_MASK; 87 } 88