patch-2.4.10 linux/arch/mips64/mips-boards/generic/memory.c

• Lines: 264
• Date: Sun Sep 9 10:43:02 2001
• Orig file: v2.4.9/linux/arch/mips64/mips-boards/generic/memory.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/arch/mips64/mips-boards/generic/memory.c linux/arch/mips64/mips-boards/generic/memory.c
@@ -0,0 +1,263 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ * ########################################################################
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * ########################################################################
+ *
+ * PROM library functions for acquiring/using memory descriptors given to 
+ * us from the YAMON.
+ * 
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+
+#include <asm/bootinfo.h>
+#include <asm/page.h>
+
+#include <asm/mips-boards/prom.h>
+
+/*#define DEBUG*/
+
+enum yamon_memtypes {
+	yamon_dontuse,
+	yamon_prom,
+	yamon_free,
+};
+struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
+
+#define MEMTYPE_DONTUSE 0
+#define MEMTYPE_PROM    1
+#define MEMTYPE_FREE    2
+
+#ifdef DEBUG
+static char *mtypes[3] = {
+	"Dont use memory",
+	"YAMON PROM memory",
+	"Free memmory",
+};
+#endif
+
+/* References to section boundaries */
+extern char _end;
+
+#define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
+
+struct prom_pmemblock * __init prom_getmdesc(void)
+{
+	char *memsize_str;
+	unsigned int memsize;
+
+	memsize_str = prom_getenv("memsize");
+	if (!memsize_str) {
+		prom_printf("memsize not set in boot prom, set to default (32Mb)\n");
+		memsize = 0x02000000;
+	} else {
+#ifdef DEBUG
+		prom_printf("prom_memsize = %s\n", memsize_str);
+#endif
+		memsize = simple_strtol(memsize_str, NULL, 0);
+	}
+
+	memset(mdesc, 0, sizeof(mdesc));
+
+	mdesc[0].type = yamon_dontuse;
+	mdesc[0].base = 0x00000000;
+	mdesc[0].size = 0x00001000;
+
+	mdesc[1].type = yamon_prom;
+	mdesc[1].base = 0x00001000;
+	mdesc[1].size = 0x000ef000;
+
+#if (CONFIG_MIPS_MALTA)
+	/* 
+	 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the
+	 * south bridge and PCI access always forwarded to the ISA Bus and 
+	 * BIOSCS# is always generated.
+	 * This mean that this area can't be used as DMA memory for PCI 
+	 * devices.
+	 */
+	mdesc[2].type = yamon_dontuse;
+	mdesc[2].base = 0x000f0000;
+	mdesc[2].size = 0x00010000;
+#else
+	mdesc[2].type = yamon_prom;
+	mdesc[2].base = 0x000f0000;
+	mdesc[2].size = 0x00010000;
+#endif
+
+	mdesc[3].type = yamon_dontuse;
+	mdesc[3].base = 0x00100000;
+	mdesc[3].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[3].base;
+
+	mdesc[4].type = yamon_free;
+	mdesc[4].base = CPHYSADDR(PFN_ALIGN(&_end));
+	mdesc[4].size = memsize - mdesc[4].base;
+
+	return &mdesc[0];
+}
+
+int __init page_is_ram(unsigned long pagenr)
+{
+	if ((pagenr << PAGE_SHIFT) < mdesc[4].base + mdesc[4].size)
+		return 1;
+
+	return 0;
+}
+
+static struct prom_pmemblock pblocks[PROM_MAX_PMEMBLOCKS];
+
+static int __init prom_memtype_classify (unsigned int type)
+{
+	switch (type) {
+	case yamon_free:
+		return MEMTYPE_FREE;
+	case yamon_prom:
+		return MEMTYPE_PROM;
+	default:
+		return MEMTYPE_DONTUSE;
+	}
+}
+
+static inline unsigned long find_max_low_pfn(void)
+{
+	struct prom_pmemblock *p, *highest;
+	unsigned long pfn;
+
+	p = pblocks;
+	highest = 0;
+	while (p->size != 0) {
+		if (!highest || p->base > highest->base)
+			highest = p;
+		p++;
+        }
+
+	pfn = (highest->base + highest->size) >> PAGE_SHIFT;
+#ifdef DEBUG
+	prom_printf("find_max_low_pfn: 0x%lx pfns.\n", pfn);
+#endif
+	return pfn;
+}
+
+static inline struct prom_pmemblock *find_largest_memblock(void)
+{
+	struct prom_pmemblock *p, *largest;
+
+	p = pblocks;
+	largest = 0;
+	while (p->size != 0) {
+		if (!largest || p->size > largest->size)
+			largest = p;
+		p++;
+	}
+
+	return largest;
+}
+
+void __init prom_meminit(void)
+{
+	struct prom_pmemblock *largest, *p;
+	unsigned long bootmap_size;
+	int totram;
+	int i = 0;
+
+#ifdef DEBUG
+	prom_printf("YAMON MEMORY DESCRIPTOR dump:\n");
+	p = prom_getmdesc();
+	while (p->size) {
+		prom_printf("[%d,%p]: base<%08lx> size<%08lx> type<%s>\n",
+			    i, p, p->base, p->size, mtypes[p->type]);
+		p++;
+		i++;
+	}
+#endif
+	totram = 0;
+	i = 0;
+	p = prom_getmdesc();
+
+	while (p->size) {
+		pblocks[i].type = prom_memtype_classify (p->type);
+		pblocks[i].base = p->base;
+		pblocks[i].size = p->size;
+		switch (pblocks[i].type) {
+		case MEMTYPE_FREE:
+			totram += pblocks[i].size;
+#ifdef DEBUG
+			prom_printf("free_chunk[%d]: base=%08lx size=%d\n",
+				    i, pblocks[i].base, pblocks[i].size);
+#endif
+			i++;
+			break;
+		case MEMTYPE_PROM:
+#ifdef DEBUG
+		        prom_printf("prom_chunk[%d]: base=%08lx size=%d\n",
+				    i, pblocks[i].base, pblocks[i].size);
+#endif
+			i++;
+			break;
+		default:
+			break;
+		}
+		p++;
+	}
+	pblocks[i].base = 0xdeadbeef;
+	pblocks[i].size = 0; /* indicates last elem. of array */
+
+	max_low_pfn = find_max_low_pfn();
+	largest = find_largest_memblock();
+	bootmap_size = init_bootmem(largest->base >> PAGE_SHIFT, max_low_pfn);
+
+	for (i = 0; pblocks[i].size; i++)
+		if (pblocks[i].type == MEMTYPE_FREE)
+			free_bootmem(pblocks[i].base, pblocks[i].size);
+
+	/* This test is simpleminded.  It will fail if the bootmem bitmap
+	   falls into multiple adjacent PROM memory areas.  */
+	if (bootmap_size > largest->size) {
+		prom_printf("CRITIAL: overwriting PROM data.\n");
+		BUG();
+	}
+
+	/* Reserve the memory bootmap itself */
+	reserve_bootmem(largest->base, bootmap_size);
+	printk("PROMLIB: Total free ram %d bytes (%dK,%dMB)\n",
+	       totram, (totram/1024), (totram/1024/1024));
+}
+
+void prom_free_prom_memory (void)
+{
+	struct prom_pmemblock *p;
+	unsigned long freed = 0;
+	unsigned long addr;
+
+	for (p = pblocks; p->size != 0; p++) {
+		if (p->type != MEMTYPE_PROM)
+			continue;
+
+		addr = p->base;
+		while (addr < p->base + p->size) {
+		        ClearPageReserved(virt_to_page(__va(addr)));
+			set_page_count(virt_to_page(__va(addr)), 1);
+			free_page(__va(addr));
+			addr += PAGE_SIZE;
+			freed += PAGE_SIZE;
+		}
+	}
+	printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
+}