1 files changed, 161 insertions, 0 deletions
diff --git a/arch/mips/fw/arc/memory.c b/arch/mips/fw/arc/memory.c
new file mode 100644
index 000000000..dd9496f26
--- /dev/null
+++ b/arch/mips/fw/arc/memory.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * memory.c: PROM library functions for acquiring/using memory descriptors
+ *	     given to us from the ARCS firmware.
+ *
+ * Copyright (C) 1996 by David S. Miller
+ * Copyright (C) 1999, 2000, 2001 by Ralf Baechle
+ * Copyright (C) 1999, 2000 by Silicon Graphics, Inc.
+ *
+ * PROM library functions for acquiring/using memory descriptors given to us
+ * from the ARCS firmware.  This is only used when CONFIG_ARC_MEMORY is set
+ * because on some machines like SGI IP27 the ARC memory configuration data
+ * completely bogus and alternate easier to use mechanisms are available.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
+
+#include <asm/sgialib.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+
+#undef DEBUG
+
+/*
+ * For ARC firmware memory functions the unit of meassuring memory is always
+ * a 4k page of memory
+ */
+#define ARC_PAGE_SHIFT	12
+
+struct linux_mdesc * __init ArcGetMemoryDescriptor(struct linux_mdesc *Current)
+{
+	return (struct linux_mdesc *) ARC_CALL1(get_mdesc, Current);
+}
+
+#ifdef DEBUG /* convenient for debugging */
+static char *arcs_mtypes[8] = {
+	"Exception Block",
+	"ARCS Romvec Page",
+	"Free/Contig RAM",
+	"Generic Free RAM",
+	"Bad Memory",
+	"Standalone Program Pages",
+	"ARCS Temp Storage Area",
+	"ARCS Permanent Storage Area"
+};
+
+static char *arc_mtypes[8] = {
+	"Exception Block",
+	"SystemParameterBlock",
+	"FreeMemory",
+	"Bad Memory",
+	"LoadedProgram",
+	"FirmwareTemporary",
+	"FirmwarePermanent",
+	"FreeContiguous"
+};
+#define mtypes(a) (prom_flags & PROM_FLAG_ARCS) ? arcs_mtypes[a.arcs] \
+						: arc_mtypes[a.arc]
+#endif
+
+static inline int memtype_classify_arcs(union linux_memtypes type)
+{
+	switch (type.arcs) {
+	case arcs_fcontig:
+	case arcs_free:
+		return BOOT_MEM_RAM;
+	case arcs_atmp:
+		return BOOT_MEM_ROM_DATA;
+	case arcs_eblock:
+	case arcs_rvpage:
+	case arcs_bmem:
+	case arcs_prog:
+	case arcs_aperm:
+		return BOOT_MEM_RESERVED;
+	default:
+		BUG();
+	}
+	while(1);				/* Nuke warning.  */
+}
+
+static inline int memtype_classify_arc(union linux_memtypes type)
+{
+	switch (type.arc) {
+	case arc_free:
+	case arc_fcontig:
+		return BOOT_MEM_RAM;
+	case arc_atmp:
+		return BOOT_MEM_ROM_DATA;
+	case arc_eblock:
+	case arc_rvpage:
+	case arc_bmem:
+	case arc_prog:
+	case arc_aperm:
+		return BOOT_MEM_RESERVED;
+	default:
+		BUG();
+	}
+	while(1);				/* Nuke warning.  */
+}
+
+static int __init prom_memtype_classify(union linux_memtypes type)
+{
+	if (prom_flags & PROM_FLAG_ARCS)	/* SGI is ``different'' ... */
+		return memtype_classify_arcs(type);
+
+	return memtype_classify_arc(type);
+}
+
+void __init prom_meminit(void)
+{
+	struct linux_mdesc *p;
+
+#ifdef DEBUG
+	int i = 0;
+
+	printk("ARCS MEMORY DESCRIPTOR dump:\n");
+	p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
+	while(p) {
+		printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
+		       i, p, p->base, p->pages, mtypes(p->type));
+		p = ArcGetMemoryDescriptor(p);
+		i++;
+	}
+#endif
+
+	p = PROM_NULL_MDESC;
+	while ((p = ArcGetMemoryDescriptor(p))) {
+		unsigned long base, size;
+		long type;
+
+		base = p->base << ARC_PAGE_SHIFT;
+		size = p->pages << ARC_PAGE_SHIFT;
+		type = prom_memtype_classify(p->type);
+
+		add_memory_region(base, size, type);
+	}
+}
+
+void __init prom_free_prom_memory(void)
+{
+	unsigned long addr;
+	int i;
+
+	if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)
+		return;
+
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
+			continue;
+
+		addr = boot_mem_map.map[i].addr;
+		free_init_pages("prom memory",
+				addr, addr + boot_mem_map.map[i].size);
+	}
+}