| /* |
| * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu> |
| * Copyright (C) 2006 Atmark Techno, Inc. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| |
| #include <linux/bootmem.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/memblock.h> |
| #include <linux/mm.h> /* mem_init */ |
| #include <linux/initrd.h> |
| #include <linux/pagemap.h> |
| #include <linux/pfn.h> |
| #include <linux/slab.h> |
| #include <linux/swap.h> |
| |
| #include <asm/page.h> |
| #include <asm/mmu_context.h> |
| #include <asm/pgalloc.h> |
| #include <asm/sections.h> |
| #include <asm/tlb.h> |
| |
| /* Use for MMU and noMMU because of PCI generic code */ |
| int mem_init_done; |
| |
| #ifndef CONFIG_MMU |
| unsigned int __page_offset; |
| EXPORT_SYMBOL(__page_offset); |
| |
| #else |
| DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| |
| static int init_bootmem_done; |
| #endif /* CONFIG_MMU */ |
| |
| char *klimit = _end; |
| |
| /* |
| * Initialize the bootmem system and give it all the memory we |
| * have available. |
| */ |
| unsigned long memory_start; |
| EXPORT_SYMBOL(memory_start); |
| unsigned long memory_end; /* due to mm/nommu.c */ |
| unsigned long memory_size; |
| EXPORT_SYMBOL(memory_size); |
| |
| /* |
| * paging_init() sets up the page tables - in fact we've already done this. |
| */ |
| static void __init paging_init(void) |
| { |
| unsigned long zones_size[MAX_NR_ZONES]; |
| |
| /* Clean every zones */ |
| memset(zones_size, 0, sizeof(zones_size)); |
| |
| /* |
| * old: we can DMA to/from any address.put all page into ZONE_DMA |
| * We use only ZONE_NORMAL |
| */ |
| zones_size[ZONE_NORMAL] = max_mapnr; |
| |
| free_area_init(zones_size); |
| } |
| |
| void __init setup_memory(void) |
| { |
| unsigned long map_size; |
| struct memblock_region *reg; |
| |
| #ifndef CONFIG_MMU |
| u32 kernel_align_start, kernel_align_size; |
| |
| /* Find main memory where is the kernel */ |
| for_each_memblock(memory, reg) { |
| memory_start = (u32)reg->base; |
| memory_end = (u32) reg->base + reg->size; |
| if ((memory_start <= (u32)_text) && |
| ((u32)_text <= memory_end)) { |
| memory_size = memory_end - memory_start; |
| PAGE_OFFSET = memory_start; |
| printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, " |
| "size 0x%08x\n", __func__, (u32) memory_start, |
| (u32) memory_end, (u32) memory_size); |
| break; |
| } |
| } |
| |
| if (!memory_start || !memory_end) { |
| panic("%s: Missing memory setting 0x%08x-0x%08x\n", |
| __func__, (u32) memory_start, (u32) memory_end); |
| } |
| |
| /* reservation of region where is the kernel */ |
| kernel_align_start = PAGE_DOWN((u32)_text); |
| /* ALIGN can be remove because _end in vmlinux.lds.S is align */ |
| kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; |
| memblock_reserve(kernel_align_start, kernel_align_size); |
| printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n", |
| __func__, kernel_align_start, kernel_align_start |
| + kernel_align_size, kernel_align_size); |
| |
| #endif |
| /* |
| * Kernel: |
| * start: base phys address of kernel - page align |
| * end: base phys address of kernel - page align |
| * |
| * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) |
| * max_low_pfn |
| * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) |
| * num_physpages - number of all pages |
| */ |
| |
| /* memory start is from the kernel end (aligned) to higher addr */ |
| min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ |
| /* RAM is assumed contiguous */ |
| num_physpages = max_mapnr = memory_size >> PAGE_SHIFT; |
| max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT; |
| |
| printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
| printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); |
| printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); |
| |
| /* |
| * Find an area to use for the bootmem bitmap. |
| * We look for the first area which is at least |
| * 128kB in length (128kB is enough for a bitmap |
| * for 4GB of memory, using 4kB pages), plus 1 page |
| * (in case the address isn't page-aligned). |
| */ |
| map_size = init_bootmem_node(NODE_DATA(0), |
| PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn); |
| memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size); |
| |
| /* free bootmem is whole main memory */ |
| free_bootmem(memory_start, memory_size); |
| |
| /* reserve allocate blocks */ |
| for_each_memblock(reserved, reg) { |
| pr_debug("reserved - 0x%08x-0x%08x\n", |
| (u32) reg->base, (u32) reg->size); |
| reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); |
| } |
| #ifdef CONFIG_MMU |
| init_bootmem_done = 1; |
| #endif |
| paging_init(); |
| } |
| |
| void free_init_pages(char *what, unsigned long begin, unsigned long end) |
| { |
| unsigned long addr; |
| |
| for (addr = begin; addr < end; addr += PAGE_SIZE) { |
| ClearPageReserved(virt_to_page(addr)); |
| init_page_count(virt_to_page(addr)); |
| free_page(addr); |
| totalram_pages++; |
| } |
| printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| int pages = 0; |
| for (; start < end; start += PAGE_SIZE) { |
| ClearPageReserved(virt_to_page(start)); |
| init_page_count(virt_to_page(start)); |
| free_page(start); |
| totalram_pages++; |
| pages++; |
| } |
| printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", |
| (int)(pages * (PAGE_SIZE / 1024))); |
| } |
| #endif |
| |
| void free_initmem(void) |
| { |
| free_init_pages("unused kernel memory", |
| (unsigned long)(&__init_begin), |
| (unsigned long)(&__init_end)); |
| } |
| |
| void __init mem_init(void) |
| { |
| high_memory = (void *)__va(memory_end); |
| /* this will put all memory onto the freelists */ |
| totalram_pages += free_all_bootmem(); |
| |
| printk(KERN_INFO "Memory: %luk/%luk available\n", |
| nr_free_pages() << (PAGE_SHIFT-10), |
| num_physpages << (PAGE_SHIFT-10)); |
| mem_init_done = 1; |
| } |
| |
| #ifndef CONFIG_MMU |
| int page_is_ram(unsigned long pfn) |
| { |
| return __range_ok(pfn, 0); |
| } |
| #else |
| int page_is_ram(unsigned long pfn) |
| { |
| return pfn < max_low_pfn; |
| } |
| |
| /* |
| * Check for command-line options that affect what MMU_init will do. |
| */ |
| static void mm_cmdline_setup(void) |
| { |
| unsigned long maxmem = 0; |
| char *p = cmd_line; |
| |
| /* Look for mem= option on command line */ |
| p = strstr(cmd_line, "mem="); |
| if (p) { |
| p += 4; |
| maxmem = memparse(p, &p); |
| if (maxmem && memory_size > maxmem) { |
| memory_size = maxmem; |
| memory_end = memory_start + memory_size; |
| memblock.memory.region[0].size = memory_size; |
| } |
| } |
| } |
| |
| /* |
| * MMU_init_hw does the chip-specific initialization of the MMU hardware. |
| */ |
| static void __init mmu_init_hw(void) |
| { |
| /* |
| * The Zone Protection Register (ZPR) defines how protection will |
| * be applied to every page which is a member of a given zone. At |
| * present, we utilize only two of the zones. |
| * The zone index bits (of ZSEL) in the PTE are used for software |
| * indicators, except the LSB. For user access, zone 1 is used, |
| * for kernel access, zone 0 is used. We set all but zone 1 |
| * to zero, allowing only kernel access as indicated in the PTE. |
| * For zone 1, we set a 01 binary (a value of 10 will not work) |
| * to allow user access as indicated in the PTE. This also allows |
| * kernel access as indicated in the PTE. |
| */ |
| __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ |
| "mts rzpr, r11;" |
| : : : "r11"); |
| } |
| |
| /* |
| * MMU_init sets up the basic memory mappings for the kernel, |
| * including both RAM and possibly some I/O regions, |
| * and sets up the page tables and the MMU hardware ready to go. |
| */ |
| |
| /* called from head.S */ |
| asmlinkage void __init mmu_init(void) |
| { |
| unsigned int kstart, ksize; |
| |
| if (!memblock.reserved.cnt) { |
| printk(KERN_EMERG "Error memory count\n"); |
| machine_restart(NULL); |
| } |
| |
| if ((u32) memblock.memory.region[0].size < 0x1000000) { |
| printk(KERN_EMERG "Memory must be greater than 16MB\n"); |
| machine_restart(NULL); |
| } |
| /* Find main memory where the kernel is */ |
| memory_start = (u32) memblock.memory.region[0].base; |
| memory_end = (u32) memblock.memory.region[0].base + |
| (u32) memblock.memory.region[0].size; |
| memory_size = memory_end - memory_start; |
| |
| mm_cmdline_setup(); /* FIXME parse args from command line - not used */ |
| |
| /* |
| * Map out the kernel text/data/bss from the available physical |
| * memory. |
| */ |
| kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ |
| /* kernel size */ |
| ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); |
| memblock_reserve(kstart, ksize); |
| |
| #if defined(CONFIG_BLK_DEV_INITRD) |
| /* Remove the init RAM disk from the available memory. */ |
| /* if (initrd_start) { |
| mem_pieces_remove(&phys_avail, __pa(initrd_start), |
| initrd_end - initrd_start, 1); |
| }*/ |
| #endif /* CONFIG_BLK_DEV_INITRD */ |
| |
| /* Initialize the MMU hardware */ |
| mmu_init_hw(); |
| |
| /* Map in all of RAM starting at CONFIG_KERNEL_START */ |
| mapin_ram(); |
| |
| #ifdef HIGHMEM_START_BOOL |
| ioremap_base = HIGHMEM_START; |
| #else |
| ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */ |
| #endif /* CONFIG_HIGHMEM */ |
| ioremap_bot = ioremap_base; |
| |
| /* Initialize the context management stuff */ |
| mmu_context_init(); |
| } |
| |
| /* This is only called until mem_init is done. */ |
| void __init *early_get_page(void) |
| { |
| void *p; |
| if (init_bootmem_done) { |
| p = alloc_bootmem_pages(PAGE_SIZE); |
| } else { |
| /* |
| * Mem start + 32MB -> here is limit |
| * because of mem mapping from head.S |
| */ |
| p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, |
| memory_start + 0x2000000)); |
| } |
| return p; |
| } |
| |
| #endif /* CONFIG_MMU */ |
| |
| void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask) |
| { |
| if (mem_init_done) |
| return kmalloc(size, mask); |
| else |
| return alloc_bootmem(size); |
| } |
| |
| void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask) |
| { |
| void *p; |
| |
| if (mem_init_done) |
| p = kzalloc(size, mask); |
| else { |
| p = alloc_bootmem(size); |
| if (p) |
| memset(p, 0, size); |
| } |
| return p; |
| } |