unicore32 core architecture: mm related: generic codes

This patch includes generic codes for memory management.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 517 insertions, 0 deletions

diff --git a/arch/unicore32/mm/init.c b/arch/unicore32/mm/init.c
new file mode 100644
index 000000000000..3dbe3709b69d
--- /dev/null
+++ b/arch/unicore32/mm/init.c
@@ -0,0 +1,517 @@
+/*
+ *  linux/arch/unicore32/mm/init.c
+ *
+ *  Copyright (C) 2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/initrd.h>
+#include <linux/highmem.h>
+#include <linux/gfp.h>
+#include <linux/memblock.h>
+#include <linux/sort.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/sizes.h>
+#include <asm/tlb.h>
+#include <mach/map.h>
+
+#include "mm.h"
+
+static unsigned long phys_initrd_start __initdata = 0x01000000;
+static unsigned long phys_initrd_size __initdata = SZ_8M;
+
+static int __init early_initrd(char *p)
+{
+	unsigned long start, size;
+	char *endp;
+
+	start = memparse(p, &endp);
+	if (*endp == ',') {
+		size = memparse(endp + 1, NULL);
+
+		phys_initrd_start = start;
+		phys_initrd_size = size;
+	}
+	return 0;
+}
+early_param("initrd", early_initrd);
+
+/*
+ * This keeps memory configuration data used by a couple memory
+ * initialization functions, as well as show_mem() for the skipping
+ * of holes in the memory map.  It is populated by uc32_add_memory().
+ */
+struct meminfo meminfo;
+
+void show_mem(void)
+{
+	int free = 0, total = 0, reserved = 0;
+	int shared = 0, cached = 0, slab = 0, i;
+	struct meminfo *mi = &meminfo;
+
+	printk(KERN_DEFAULT "Mem-info:\n");
+	show_free_areas();
+
+	for_each_bank(i, mi) {
+		struct membank *bank = &mi->bank[i];
+		unsigned int pfn1, pfn2;
+		struct page *page, *end;
+
+		pfn1 = bank_pfn_start(bank);
+		pfn2 = bank_pfn_end(bank);
+
+		page = pfn_to_page(pfn1);
+		end  = pfn_to_page(pfn2 - 1) + 1;
+
+		do {
+			total++;
+			if (PageReserved(page))
+				reserved++;
+			else if (PageSwapCache(page))
+				cached++;
+			else if (PageSlab(page))
+				slab++;
+			else if (!page_count(page))
+				free++;
+			else
+				shared += page_count(page) - 1;
+			page++;
+		} while (page < end);
+	}
+
+	printk(KERN_DEFAULT "%d pages of RAM\n", total);
+	printk(KERN_DEFAULT "%d free pages\n", free);
+	printk(KERN_DEFAULT "%d reserved pages\n", reserved);
+	printk(KERN_DEFAULT "%d slab pages\n", slab);
+	printk(KERN_DEFAULT "%d pages shared\n", shared);
+	printk(KERN_DEFAULT "%d pages swap cached\n", cached);
+}
+
+static void __init find_limits(unsigned long *min, unsigned long *max_low,
+	unsigned long *max_high)
+{
+	struct meminfo *mi = &meminfo;
+	int i;
+
+	*min = -1UL;
+	*max_low = *max_high = 0;
+
+	for_each_bank(i, mi) {
+		struct membank *bank = &mi->bank[i];
+		unsigned long start, end;
+
+		start = bank_pfn_start(bank);
+		end = bank_pfn_end(bank);
+
+		if (*min > start)
+			*min = start;
+		if (*max_high < end)
+			*max_high = end;
+		if (bank->highmem)
+			continue;
+		if (*max_low < end)
+			*max_low = end;
+	}
+}
+
+static void __init uc32_bootmem_init(unsigned long start_pfn,
+	unsigned long end_pfn)
+{
+	struct memblock_region *reg;
+	unsigned int boot_pages;
+	phys_addr_t bitmap;
+	pg_data_t *pgdat;
+
+	/*
+	 * Allocate the bootmem bitmap page.  This must be in a region
+	 * of memory which has already been mapped.
+	 */
+	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
+	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
+				__pfn_to_phys(end_pfn));
+
+	/*
+	 * Initialise the bootmem allocator, handing the
+	 * memory banks over to bootmem.
+	 */
+	node_set_online(0);
+	pgdat = NODE_DATA(0);
+	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
+
+	/* Free the lowmem regions from memblock into bootmem. */
+	for_each_memblock(memory, reg) {
+		unsigned long start = memblock_region_memory_base_pfn(reg);
+		unsigned long end = memblock_region_memory_end_pfn(reg);
+
+		if (end >= end_pfn)
+			end = end_pfn;
+		if (start >= end)
+			break;
+
+		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
+	}
+
+	/* Reserve the lowmem memblock reserved regions in bootmem. */
+	for_each_memblock(reserved, reg) {
+		unsigned long start = memblock_region_reserved_base_pfn(reg);
+		unsigned long end = memblock_region_reserved_end_pfn(reg);
+
+		if (end >= end_pfn)
+			end = end_pfn;
+		if (start >= end)
+			break;
+
+		reserve_bootmem(__pfn_to_phys(start),
+			(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
+	}
+}
+
+static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
+	unsigned long max_high)
+{
+	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
+	struct memblock_region *reg;
+
+	/*
+	 * initialise the zones.
+	 */
+	memset(zone_size, 0, sizeof(zone_size));
+
+	/*
+	 * The memory size has already been determined.  If we need
+	 * to do anything fancy with the allocation of this memory
+	 * to the zones, now is the time to do it.
+	 */
+	zone_size[0] = max_low - min;
+
+	/*
+	 * Calculate the size of the holes.
+	 *  holes = node_size - sum(bank_sizes)
+	 */
+	memcpy(zhole_size, zone_size, sizeof(zhole_size));
+	for_each_memblock(memory, reg) {
+		unsigned long start = memblock_region_memory_base_pfn(reg);
+		unsigned long end = memblock_region_memory_end_pfn(reg);
+
+		if (start < max_low) {
+			unsigned long low_end = min(end, max_low);
+			zhole_size[0] -= low_end - start;
+		}
+	}
+
+	/*
+	 * Adjust the sizes according to any special requirements for
+	 * this machine type.
+	 */
+	arch_adjust_zones(zone_size, zhole_size);
+
+	free_area_init_node(0, zone_size, min, zhole_size);
+}
+
+int pfn_valid(unsigned long pfn)
+{
+	return memblock_is_memory(pfn << PAGE_SHIFT);
+}
+EXPORT_SYMBOL(pfn_valid);
+
+static void uc32_memory_present(void)
+{
+}
+
+static int __init meminfo_cmp(const void *_a, const void *_b)
+{
+	const struct membank *a = _a, *b = _b;
+	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
+	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
+}
+
+void __init uc32_memblock_init(struct meminfo *mi)
+{
+	int i;
+
+	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
+		meminfo_cmp, NULL);
+
+	memblock_init();
+	for (i = 0; i < mi->nr_banks; i++)
+		memblock_add(mi->bank[i].start, mi->bank[i].size);
+
+	/* Register the kernel text, kernel data and initrd with memblock. */
+	memblock_reserve(__pa(_text), _end - _text);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (phys_initrd_size) {
+		memblock_reserve(phys_initrd_start, phys_initrd_size);
+
+		/* Now convert initrd to virtual addresses */
+		initrd_start = __phys_to_virt(phys_initrd_start);
+		initrd_end = initrd_start + phys_initrd_size;
+	}
+#endif
+
+	uc32_mm_memblock_reserve();
+
+	memblock_analyze();
+	memblock_dump_all();
+}
+
+void __init bootmem_init(void)
+{
+	unsigned long min, max_low, max_high;
+
+	max_low = max_high = 0;
+
+	find_limits(&min, &max_low, &max_high);
+
+	uc32_bootmem_init(min, max_low);
+
+#ifdef CONFIG_SWIOTLB
+	swiotlb_init(1);
+#endif
+	/*
+	 * Sparsemem tries to allocate bootmem in memory_present(),
+	 * so must be done after the fixed reservations
+	 */
+	uc32_memory_present();
+
+	/*
+	 * sparse_init() needs the bootmem allocator up and running.
+	 */
+	sparse_init();
+
+	/*
+	 * Now free the memory - free_area_init_node needs
+	 * the sparse mem_map arrays initialized by sparse_init()
+	 * for memmap_init_zone(), otherwise all PFNs are invalid.
+	 */
+	uc32_bootmem_free(min, max_low, max_high);
+
+	high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
+
+	/*
+	 * This doesn't seem to be used by the Linux memory manager any
+	 * more, but is used by ll_rw_block.  If we can get rid of it, we
+	 * also get rid of some of the stuff above as well.
+	 *
+	 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
+	 * the system, not the maximum PFN.
+	 */
+	max_low_pfn = max_low - PHYS_PFN_OFFSET;
+	max_pfn = max_high - PHYS_PFN_OFFSET;
+}
+
+static inline int free_area(unsigned long pfn, unsigned long end, char *s)
+{
+	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
+
+	for (; pfn < end; pfn++) {
+		struct page *page = pfn_to_page(pfn);
+		ClearPageReserved(page);
+		init_page_count(page);
+		__free_page(page);
+		pages++;
+	}
+
+	if (size && s)
+		printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
+
+	return pages;
+}
+
+static inline void
+free_memmap(unsigned long start_pfn, unsigned long end_pfn)
+{
+	struct page *start_pg, *end_pg;
+	unsigned long pg, pgend;
+
+	/*
+	 * Convert start_pfn/end_pfn to a struct page pointer.
+	 */
+	start_pg = pfn_to_page(start_pfn - 1) + 1;
+	end_pg = pfn_to_page(end_pfn);
+
+	/*
+	 * Convert to physical addresses, and
+	 * round start upwards and end downwards.
+	 */
+	pg = PAGE_ALIGN(__pa(start_pg));
+	pgend = __pa(end_pg) & PAGE_MASK;
+
+	/*
+	 * If there are free pages between these,
+	 * free the section of the memmap array.
+	 */
+	if (pg < pgend)
+		free_bootmem(pg, pgend - pg);
+}
+
+/*
+ * The mem_map array can get very big.  Free the unused area of the memory map.
+ */
+static void __init free_unused_memmap(struct meminfo *mi)
+{
+	unsigned long bank_start, prev_bank_end = 0;
+	unsigned int i;
+
+	/*
+	 * This relies on each bank being in address order.
+	 * The banks are sorted previously in bootmem_init().
+	 */
+	for_each_bank(i, mi) {
+		struct membank *bank = &mi->bank[i];
+
+		bank_start = bank_pfn_start(bank);
+
+		/*
+		 * If we had a previous bank, and there is a space
+		 * between the current bank and the previous, free it.
+		 */
+		if (prev_bank_end && prev_bank_end < bank_start)
+			free_memmap(prev_bank_end, bank_start);
+
+		/*
+		 * Align up here since the VM subsystem insists that the
+		 * memmap entries are valid from the bank end aligned to
+		 * MAX_ORDER_NR_PAGES.
+		 */
+		prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
+	}
+}
+
+/*
+ * mem_init() marks the free areas in the mem_map and tells us how much
+ * memory is free.  This is done after various parts of the system have
+ * claimed their memory after the kernel image.
+ */
+void __init mem_init(void)
+{
+	unsigned long reserved_pages, free_pages;
+	struct memblock_region *reg;
+	int i;
+
+	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
+
+	/* this will put all unused low memory onto the freelists */
+	free_unused_memmap(&meminfo);
+
+	totalram_pages += free_all_bootmem();
+
+	reserved_pages = free_pages = 0;
+
+	for_each_bank(i, &meminfo) {
+		struct membank *bank = &meminfo.bank[i];
+		unsigned int pfn1, pfn2;
+		struct page *page, *end;
+
+		pfn1 = bank_pfn_start(bank);
+		pfn2 = bank_pfn_end(bank);
+
+		page = pfn_to_page(pfn1);
+		end  = pfn_to_page(pfn2 - 1) + 1;
+
+		do {
+			if (PageReserved(page))
+				reserved_pages++;
+			else if (!page_count(page))
+				free_pages++;
+			page++;
+		} while (page < end);
+	}
+
+	/*
+	 * Since our memory may not be contiguous, calculate the
+	 * real number of pages we have in this system
+	 */
+	printk(KERN_INFO "Memory:");
+	num_physpages = 0;
+	for_each_memblock(memory, reg) {
+		unsigned long pages = memblock_region_memory_end_pfn(reg) -
+			memblock_region_memory_base_pfn(reg);
+		num_physpages += pages;
+		printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
+	}
+	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
+
+	printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
+		nr_free_pages() << (PAGE_SHIFT-10),
+		free_pages << (PAGE_SHIFT-10),
+		reserved_pages << (PAGE_SHIFT-10),
+		totalhigh_pages << (PAGE_SHIFT-10));
+
+	printk(KERN_NOTICE "Virtual kernel memory layout:\n"
+		"    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+		"    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+		"      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
+		"      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
+		"      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
+
+		VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
+		DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
+		VMALLOC_START, VMALLOC_END,
+		DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
+		PAGE_OFFSET, (unsigned long)high_memory,
+		DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
+		MODULES_VADDR, MODULES_END,
+		DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
+
+		__init_begin, __init_end,
+		DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
+		_stext, _etext,
+		DIV_ROUND_UP((_etext - _stext), SZ_1K),
+		_sdata, _edata,
+		DIV_ROUND_UP((_edata - _sdata), SZ_1K));
+
+	BUILD_BUG_ON(TASK_SIZE				> MODULES_VADDR);
+	BUG_ON(TASK_SIZE				> MODULES_VADDR);
+
+	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
+		/*
+		 * On a machine this small we won't get
+		 * anywhere without overcommit, so turn
+		 * it on by default.
+		 */
+		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
+	}
+}
+
+void free_initmem(void)
+{
+	totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
+				    __phys_to_pfn(__pa(__init_end)),
+				    "init");
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int keep_initrd;
+
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	if (!keep_initrd)
+		totalram_pages += free_area(__phys_to_pfn(__pa(start)),
+					    __phys_to_pfn(__pa(end)),
+					    "initrd");
+}
+
+static int __init keepinitrd_setup(char *__unused)
+{
+	keep_initrd = 1;
+	return 1;
+}
+
+__setup("keepinitrd", keepinitrd_setup);
+#endif