1 files changed, 88 insertions, 0 deletions
diff --git a/arch/sparc/prom/memory.c b/arch/sparc/prom/memory.c
new file mode 100644
index 000000000..269d6ab5e
--- /dev/null
+++ b/arch/sparc/prom/memory.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/* memory.c: Prom routine for acquiring various bits of information
+ *           about RAM on the machine, both virtual and physical.
+ *
+ * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
+ */
+
+#include <linux/kernel.h>
+#include <linux/sort.h>
+#include <linux/init.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/page.h>
+
+static int __init prom_meminit_v0(void)
+{
+	struct linux_mlist_v0 *p;
+	int index;
+
+	index = 0;
+	for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
+		sp_banks[index].base_addr = (unsigned long) p->start_adr;
+		sp_banks[index].num_bytes = p->num_bytes;
+		index++;
+	}
+
+	return index;
+}
+
+static int __init prom_meminit_v2(void)
+{
+	struct linux_prom_registers reg[64];
+	phandle node;
+	int size, num_ents, i;
+
+	node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
+	size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
+	num_ents = size / sizeof(struct linux_prom_registers);
+
+	for (i = 0; i < num_ents; i++) {
+		sp_banks[i].base_addr = reg[i].phys_addr;
+		sp_banks[i].num_bytes = reg[i].reg_size;
+	}
+
+	return num_ents;
+}
+
+static int sp_banks_cmp(const void *a, const void *b)
+{
+	const struct sparc_phys_banks *x = a, *y = b;
+
+	if (x->base_addr > y->base_addr)
+		return 1;
+	if (x->base_addr < y->base_addr)
+		return -1;
+	return 0;
+}
+
+/* Initialize the memory lists based upon the prom version. */
+void __init prom_meminit(void)
+{
+	int i, num_ents = 0;
+
+	switch (prom_vers) {
+	case PROM_V0:
+		num_ents = prom_meminit_v0();
+		break;
+
+	case PROM_V2:
+	case PROM_V3:
+		num_ents = prom_meminit_v2();
+		break;
+
+	default:
+		break;
+	}
+	sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
+	     sp_banks_cmp, NULL);
+
+	/* Sentinel.  */
+	sp_banks[num_ents].base_addr = 0xdeadbeef;
+	sp_banks[num_ents].num_bytes = 0;
+
+	for (i = 0; i < num_ents; i++)
+		sp_banks[i].num_bytes &= PAGE_MASK;
+}