| /* |
| * 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/memblock.h> |
| #include <linux/init.h> |
| #include <linux/kernel.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 <linux/export.h> |
| |
| #include <asm/page.h> |
| #include <asm/mmu_context.h> |
| #include <asm/pgalloc.h> |
| #include <asm/sections.h> |
| #include <asm/tlb.h> |
| #include <asm/fixmap.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); |
| #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_size; |
| EXPORT_SYMBOL(memory_size); |
| unsigned long lowmem_size; |
| |
| #ifdef CONFIG_HIGHMEM |
| pte_t *kmap_pte; |
| EXPORT_SYMBOL(kmap_pte); |
| pgprot_t kmap_prot; |
| EXPORT_SYMBOL(kmap_prot); |
| |
| static inline pte_t *virt_to_kpte(unsigned long vaddr) |
| { |
| return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), |
| vaddr), vaddr); |
| } |
| |
| static void __init highmem_init(void) |
| { |
| pr_debug("%x\n", (u32)PKMAP_BASE); |
| map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
| pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
| |
| kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); |
| kmap_prot = PAGE_KERNEL; |
| } |
| |
| static void highmem_setup(void) |
| { |
| unsigned long pfn; |
| |
| for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) { |
| struct page *page = pfn_to_page(pfn); |
| |
| /* FIXME not sure about */ |
| if (!memblock_is_reserved(pfn << PAGE_SHIFT)) |
| free_highmem_page(page); |
| } |
| } |
| #endif /* CONFIG_HIGHMEM */ |
| |
| /* |
| * 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]; |
| #ifdef CONFIG_MMU |
| int idx; |
| |
| /* Setup fixmaps */ |
| for (idx = 0; idx < __end_of_fixed_addresses; idx++) |
| clear_fixmap(idx); |
| #endif |
| |
| /* Clean every zones */ |
| memset(zones_size, 0, sizeof(zones_size)); |
| |
| #ifdef CONFIG_HIGHMEM |
| highmem_init(); |
| |
| zones_size[ZONE_DMA] = max_low_pfn; |
| zones_size[ZONE_HIGHMEM] = max_pfn; |
| #else |
| zones_size[ZONE_DMA] = max_pfn; |
| #endif |
| |
| /* We don't have holes in memory map */ |
| free_area_init_nodes(zones_size); |
| } |
| |
| void __init setup_memory(void) |
| { |
| 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; |
| lowmem_size = reg->size; |
| if ((memory_start <= (u32)_text) && |
| ((u32)_text <= (memory_start + lowmem_size - 1))) { |
| memory_size = lowmem_size; |
| PAGE_OFFSET = memory_start; |
| pr_info("%s: Main mem: 0x%x, size 0x%08x\n", |
| __func__, (u32) memory_start, |
| (u32) memory_size); |
| break; |
| } |
| } |
| |
| if (!memory_start || !memory_size) { |
| panic("%s: Missing memory setting 0x%08x, size=0x%08x\n", |
| __func__, (u32) memory_start, (u32) memory_size); |
| } |
| |
| /* 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; |
| pr_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); |
| memblock_reserve(kernel_align_start, 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) |
| */ |
| |
| /* 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 */ |
| max_mapnr = memory_size >> PAGE_SHIFT; |
| max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT; |
| max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT; |
| |
| pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
| pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); |
| pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); |
| pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn); |
| |
| /* Add active regions with valid PFNs */ |
| for_each_memblock(memory, reg) { |
| unsigned long start_pfn, end_pfn; |
| |
| start_pfn = memblock_region_memory_base_pfn(reg); |
| end_pfn = memblock_region_memory_end_pfn(reg); |
| memblock_set_node(start_pfn << PAGE_SHIFT, |
| (end_pfn - start_pfn) << PAGE_SHIFT, |
| &memblock.memory, 0); |
| } |
| |
| /* XXX need to clip this if using highmem? */ |
| sparse_memory_present_with_active_regions(0); |
| |
| paging_init(); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
| } |
| #endif |
| |
| void free_initmem(void) |
| { |
| free_initmem_default(-1); |
| } |
| |
| void __init mem_init(void) |
| { |
| high_memory = (void *)__va(memory_start + lowmem_size - 1); |
| |
| /* this will put all memory onto the freelists */ |
| memblock_free_all(); |
| #ifdef CONFIG_HIGHMEM |
| highmem_setup(); |
| #endif |
| |
| mem_init_print_info(NULL); |
| #ifdef CONFIG_MMU |
| pr_info("Kernel virtual memory layout:\n"); |
| pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); |
| #ifdef CONFIG_HIGHMEM |
| pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", |
| PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); |
| #endif /* CONFIG_HIGHMEM */ |
| pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
| ioremap_bot, ioremap_base); |
| pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", |
| (unsigned long)VMALLOC_START, VMALLOC_END); |
| #endif |
| 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; |
| memblock.memory.regions[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) { |
| pr_emerg("Error memory count\n"); |
| machine_restart(NULL); |
| } |
| |
| if ((u32) memblock.memory.regions[0].size < 0x400000) { |
| pr_emerg("Memory must be greater than 4MB\n"); |
| machine_restart(NULL); |
| } |
| |
| if ((u32) memblock.memory.regions[0].size < kernel_tlb) { |
| pr_emerg("Kernel size is greater than memory node\n"); |
| machine_restart(NULL); |
| } |
| |
| /* Find main memory where the kernel is */ |
| memory_start = (u32) memblock.memory.regions[0].base; |
| lowmem_size = memory_size = (u32) memblock.memory.regions[0].size; |
| |
| if (lowmem_size > CONFIG_LOWMEM_SIZE) { |
| lowmem_size = CONFIG_LOWMEM_SIZE; |
| #ifndef CONFIG_HIGHMEM |
| memory_size = lowmem_size; |
| #endif |
| } |
| |
| 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) { |
| unsigned long size; |
| size = initrd_end - initrd_start; |
| memblock_reserve(__virt_to_phys(initrd_start), size); |
| } |
| #endif /* CONFIG_BLK_DEV_INITRD */ |
| |
| /* Initialize the MMU hardware */ |
| mmu_init_hw(); |
| |
| /* Map in all of RAM starting at CONFIG_KERNEL_START */ |
| mapin_ram(); |
| |
| /* Extend vmalloc and ioremap area as big as possible */ |
| #ifdef CONFIG_HIGHMEM |
| ioremap_base = ioremap_bot = PKMAP_BASE; |
| #else |
| ioremap_base = ioremap_bot = FIXADDR_START; |
| #endif |
| |
| /* Initialize the context management stuff */ |
| mmu_context_init(); |
| |
| /* Shortly after that, the entire linear mapping will be available */ |
| /* This will also cause that unflatten device tree will be allocated |
| * inside 768MB limit */ |
| memblock_set_current_limit(memory_start + lowmem_size - 1); |
| } |
| |
| /* This is only called until mem_init is done. */ |
| void __init *early_get_page(void) |
| { |
| /* |
| * Mem start + kernel_tlb -> here is limit |
| * because of mem mapping from head.S |
| */ |
| return __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, |
| memory_start + kernel_tlb)); |
| } |
| |
| #endif /* CONFIG_MMU */ |
| |
| void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask) |
| { |
| void *p; |
| |
| if (mem_init_done) |
| p = kzalloc(size, mask); |
| else { |
| p = memblock_alloc(size, SMP_CACHE_BYTES); |
| if (p) |
| memset(p, 0, size); |
| } |
| return p; |
| } |