1 files changed, 129 insertions, 0 deletions
diff --git a/arch/mips/sgi/prom/memory.c b/arch/mips/sgi/prom/memory.c
new file mode 100644
index 000000000..cb392a805
--- /dev/null
+++ b/arch/mips/sgi/prom/memory.c
@@ -0,0 +1,129 @@
+/* $Id: memory.c,v 1.5 1996/06/10 16:38:33 dm Exp $
+ * memory.c: PROM library functions for acquiring/using memory descriptors
+ *           given to us from the ARCS firmware.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+
+#include <asm/sgialib.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/bootinfo.h>
+
+/* #define DEBUG */
+
+struct linux_mdesc *prom_getmdesc(struct linux_mdesc *curr)
+{
+	return romvec->get_mdesc(curr);
+}
+
+#ifdef DEBUG /* convenient for debugging */
+static char *mtypes[8] = {
+	"Exception Block",
+	"ARCS Romvec Page",
+	"Free/Contig RAM",
+	"Generic Free RAM",
+	"Bad Memory",
+	"Standlong Program Pages",
+	"ARCS Temp Storage Area",
+	"ARCS Permanent Storage Area"
+};
+#endif
+
+static struct prom_pmemblock prom_pblocks[PROM_MAX_PMEMBLOCKS];
+
+struct prom_pmemblock *prom_getpblock_array(void)
+{
+	return &prom_pblocks[0];
+}
+
+static void prom_setup_memupper(void)
+{
+	struct prom_pmemblock *p, *highest;
+
+	for(p = prom_getpblock_array(), highest = 0; p->size != 0; p++) {
+		if(p->base == 0xdeadbeef)
+			prom_printf("WHEEE, bogus pmemblock\n");
+		if(!highest || p->base > highest->base)
+			highest = p;
+	}
+	mips_memory_upper = highest->base + highest->size;
+#ifdef DEBUG
+	prom_printf("prom_setup_memupper: mips_memory_upper = %08lx\n",
+		    mips_memory_upper);
+#endif
+}
+
+void prom_meminit(void)
+{
+	struct linux_mdesc *p;
+	int totram;
+	int i = 0;
+
+	p = prom_getmdesc(PROM_NULL_MDESC);
+#ifdef DEBUG
+	prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
+	while(p) {
+		prom_printf("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
+			    i, p, p->base, p->pages, mtypes[p->type]);
+		p = prom_getmdesc(p);
+		i++;
+	}
+#endif
+	p = prom_getmdesc(PROM_NULL_MDESC);
+	totram = 0;
+	i = 0;
+	while(p) {
+		if(p->type == free || p->type == fcontig) {
+			prom_pblocks[i].base =
+				((p->base<<PAGE_SHIFT) + 0x80000000);
+			prom_pblocks[i].size = p->pages << PAGE_SHIFT;
+			totram += prom_pblocks[i].size;
+#ifdef DEBUG
+			prom_printf("free_chunk[%d]: base=%08lx size=%d\n",
+				    i, prom_pblocks[i].base,
+				    prom_pblocks[i].size);
+#endif
+			i++;
+		}
+		p = prom_getmdesc(p);
+	}
+	prom_pblocks[i].base = 0xdeadbeef;
+	prom_pblocks[i].size = 0; /* indicates last elem. of array */
+	printk("PROMLIB: Total free ram %d bytes (%dK,%dMB)\n",
+		    totram, (totram/1024), (totram/1024/1024));
+
+	/* Setup upper physical memory bound. */
+	prom_setup_memupper();
+}
+
+/* Called from mem_init() to fixup the mem_map page settings. */
+void prom_fixup_mem_map(unsigned long start, unsigned long end)
+{
+	struct prom_pmemblock *p;
+	int i, nents;
+
+	/* Determine number of pblockarray entries. */
+	p = prom_getpblock_array();
+	for(i = 0; p[i].size; i++)
+		;
+	nents = i;
+	while(start < end) {
+		for(i = 0; i < nents; i++) {
+			if((start >= (p[i].base)) &&
+			   (start < (p[i].base + p[i].size))) {
+				start = p[i].base + p[i].size;
+				start &= PAGE_MASK;
+				continue;
+			}
+		}
+		set_bit(PG_reserved, &mem_map[MAP_NR(start)].flags);
+		start += PAGE_SIZE;
+	}
+}