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/sun4prom.h> 14 #include <asm/oplib.h> 15 #include <asm/page.h> 16 17 static int __init prom_meminit_v0(void) 18 { 19 struct linux_mlist_v0 *p; 20 int index; 21 22 index = 0; 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; 26 index++; 27 } 28 29 return index; 30 } 31 32 static int __init prom_meminit_v2(void) 33 { 34 struct linux_prom_registers reg[64]; 35 int node, 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 __init prom_meminit_sun4(void) 50 { 51 #ifdef CONFIG_SUN4 52 sp_banks[0].base_addr = 0; 53 sp_banks[0].num_bytes = *(sun4_romvec->memoryavail); 54 #endif 55 return 1; 56 } 57 58 static int sp_banks_cmp(const void *a, const void *b) 59 { 60 const struct sparc_phys_banks *x = a, *y = b; 61 62 if (x->base_addr > y->base_addr) 63 return 1; 64 if (x->base_addr < y->base_addr) 65 return -1; 66 return 0; 67 } 68 69 /* Initialize the memory lists based upon the prom version. */ 70 void __init prom_meminit(void) 71 { 72 int i, num_ents = 0; 73 74 switch (prom_vers) { 75 case PROM_V0: 76 num_ents = prom_meminit_v0(); 77 break; 78 79 case PROM_V2: 80 case PROM_V3: 81 num_ents = prom_meminit_v2(); 82 break; 83 84 case PROM_SUN4: 85 num_ents = prom_meminit_sun4(); 86 break; 87 88 default: 89 break; 90 } 91 sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), 92 sp_banks_cmp, NULL); 93 94 /* Sentinel. */ 95 sp_banks[num_ents].base_addr = 0xdeadbeef; 96 sp_banks[num_ents].num_bytes = 0; 97 98 for (i = 0; i < num_ents; i++) 99 sp_banks[i].num_bytes &= PAGE_MASK; 100 } 101