1 // SPDX-License-Identifier: GPL-2.0 2 /* memory.c: Prom routine for acquiring various bits of information 3 * about RAM on the machine, both virtual and physical. 4 * 5 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) 6 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org) 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/sort.h> 11 #include <linux/init.h> 12 13 #include <asm/openprom.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 phandle node; 36 int size, num_ents, i; 37 38 node = prom_searchsiblings(prom_getchild(prom_root_node), "memory"); 39 size = prom_getproperty(node, "available", (char *) reg, sizeof(reg)); 40 num_ents = size / sizeof(struct linux_prom_registers); 41 42 for (i = 0; i < num_ents; i++) { 43 sp_banks[i].base_addr = reg[i].phys_addr; 44 sp_banks[i].num_bytes = reg[i].reg_size; 45 } 46 47 return num_ents; 48 } 49 50 static int sp_banks_cmp(const void *a, const void *b) 51 { 52 const struct sparc_phys_banks *x = a, *y = b; 53 54 if (x->base_addr > y->base_addr) 55 return 1; 56 if (x->base_addr < y->base_addr) 57 return -1; 58 return 0; 59 } 60 61 /* Initialize the memory lists based upon the prom version. */ 62 void __init prom_meminit(void) 63 { 64 int i, num_ents = 0; 65 66 switch (prom_vers) { 67 case PROM_V0: 68 num_ents = prom_meminit_v0(); 69 break; 70 71 case PROM_V2: 72 case PROM_V3: 73 num_ents = prom_meminit_v2(); 74 break; 75 76 default: 77 break; 78 } 79 sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), 80 sp_banks_cmp, NULL); 81 82 /* Sentinel. */ 83 sp_banks[num_ents].base_addr = 0xdeadbeef; 84 sp_banks[num_ents].num_bytes = 0; 85 86 for (i = 0; i < num_ents; i++) 87 sp_banks[i].num_bytes &= PAGE_MASK; 88 } 89