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295 lines
7.3 KiB
295 lines
7.3 KiB
/* |
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* Copyright (C) 2007-2008 Michal Simek <[email protected]> |
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* Copyright (C) 2006 Atmark Techno, Inc. |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/dma-map-ops.h> |
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#include <linux/memblock.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> /* mem_init */ |
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#include <linux/initrd.h> |
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#include <linux/pagemap.h> |
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#include <linux/pfn.h> |
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#include <linux/slab.h> |
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#include <linux/swap.h> |
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#include <linux/export.h> |
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#include <asm/page.h> |
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#include <asm/mmu_context.h> |
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#include <asm/pgalloc.h> |
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#include <asm/sections.h> |
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#include <asm/tlb.h> |
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#include <asm/fixmap.h> |
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/* Use for MMU and noMMU because of PCI generic code */ |
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int mem_init_done; |
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char *klimit = _end; |
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/* |
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* Initialize the bootmem system and give it all the memory we |
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* have available. |
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*/ |
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unsigned long memory_start; |
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EXPORT_SYMBOL(memory_start); |
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unsigned long memory_size; |
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EXPORT_SYMBOL(memory_size); |
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unsigned long lowmem_size; |
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EXPORT_SYMBOL(min_low_pfn); |
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EXPORT_SYMBOL(max_low_pfn); |
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#ifdef CONFIG_HIGHMEM |
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static void __init highmem_init(void) |
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{ |
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pr_debug("%x\n", (u32)PKMAP_BASE); |
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map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
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pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
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} |
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static void highmem_setup(void) |
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{ |
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unsigned long pfn; |
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for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) { |
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struct page *page = pfn_to_page(pfn); |
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/* FIXME not sure about */ |
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if (!memblock_is_reserved(pfn << PAGE_SHIFT)) |
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free_highmem_page(page); |
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} |
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} |
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#endif /* CONFIG_HIGHMEM */ |
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/* |
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* paging_init() sets up the page tables - in fact we've already done this. |
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*/ |
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static void __init paging_init(void) |
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{ |
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unsigned long zones_size[MAX_NR_ZONES]; |
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int idx; |
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/* Setup fixmaps */ |
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for (idx = 0; idx < __end_of_fixed_addresses; idx++) |
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clear_fixmap(idx); |
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/* Clean every zones */ |
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memset(zones_size, 0, sizeof(zones_size)); |
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#ifdef CONFIG_HIGHMEM |
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highmem_init(); |
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zones_size[ZONE_DMA] = max_low_pfn; |
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zones_size[ZONE_HIGHMEM] = max_pfn; |
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#else |
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zones_size[ZONE_DMA] = max_pfn; |
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#endif |
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/* We don't have holes in memory map */ |
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free_area_init(zones_size); |
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} |
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void __init setup_memory(void) |
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{ |
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/* |
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* Kernel: |
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* start: base phys address of kernel - page align |
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* end: base phys address of kernel - page align |
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* |
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* min_low_pfn - the first page (mm/bootmem.c - node_boot_start) |
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* max_low_pfn |
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* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) |
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*/ |
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/* memory start is from the kernel end (aligned) to higher addr */ |
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min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ |
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/* RAM is assumed contiguous */ |
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max_mapnr = memory_size >> PAGE_SHIFT; |
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max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT; |
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max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT; |
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pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
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pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); |
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pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); |
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pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn); |
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paging_init(); |
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} |
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void __init mem_init(void) |
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{ |
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high_memory = (void *)__va(memory_start + lowmem_size - 1); |
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/* this will put all memory onto the freelists */ |
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memblock_free_all(); |
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#ifdef CONFIG_HIGHMEM |
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highmem_setup(); |
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#endif |
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mem_init_print_info(NULL); |
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mem_init_done = 1; |
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} |
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int page_is_ram(unsigned long pfn) |
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{ |
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return pfn < max_low_pfn; |
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} |
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/* |
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* Check for command-line options that affect what MMU_init will do. |
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*/ |
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static void mm_cmdline_setup(void) |
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{ |
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unsigned long maxmem = 0; |
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char *p = cmd_line; |
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/* Look for mem= option on command line */ |
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p = strstr(cmd_line, "mem="); |
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if (p) { |
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p += 4; |
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maxmem = memparse(p, &p); |
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if (maxmem && memory_size > maxmem) { |
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memory_size = maxmem; |
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memblock.memory.regions[0].size = memory_size; |
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} |
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} |
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} |
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/* |
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* MMU_init_hw does the chip-specific initialization of the MMU hardware. |
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*/ |
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static void __init mmu_init_hw(void) |
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{ |
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/* |
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* The Zone Protection Register (ZPR) defines how protection will |
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* be applied to every page which is a member of a given zone. At |
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* present, we utilize only two of the zones. |
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* The zone index bits (of ZSEL) in the PTE are used for software |
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* indicators, except the LSB. For user access, zone 1 is used, |
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* for kernel access, zone 0 is used. We set all but zone 1 |
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* to zero, allowing only kernel access as indicated in the PTE. |
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* For zone 1, we set a 01 binary (a value of 10 will not work) |
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* to allow user access as indicated in the PTE. This also allows |
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* kernel access as indicated in the PTE. |
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*/ |
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__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ |
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"mts rzpr, r11;" |
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: : : "r11"); |
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} |
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/* |
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* MMU_init sets up the basic memory mappings for the kernel, |
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* including both RAM and possibly some I/O regions, |
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* and sets up the page tables and the MMU hardware ready to go. |
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*/ |
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/* called from head.S */ |
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asmlinkage void __init mmu_init(void) |
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{ |
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unsigned int kstart, ksize; |
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if (!memblock.reserved.cnt) { |
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pr_emerg("Error memory count\n"); |
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machine_restart(NULL); |
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} |
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if ((u32) memblock.memory.regions[0].size < 0x400000) { |
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pr_emerg("Memory must be greater than 4MB\n"); |
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machine_restart(NULL); |
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} |
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if ((u32) memblock.memory.regions[0].size < kernel_tlb) { |
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pr_emerg("Kernel size is greater than memory node\n"); |
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machine_restart(NULL); |
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} |
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/* Find main memory where the kernel is */ |
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memory_start = (u32) memblock.memory.regions[0].base; |
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lowmem_size = memory_size = (u32) memblock.memory.regions[0].size; |
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if (lowmem_size > CONFIG_LOWMEM_SIZE) { |
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lowmem_size = CONFIG_LOWMEM_SIZE; |
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#ifndef CONFIG_HIGHMEM |
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memory_size = lowmem_size; |
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#endif |
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} |
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mm_cmdline_setup(); /* FIXME parse args from command line - not used */ |
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/* |
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* Map out the kernel text/data/bss from the available physical |
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* memory. |
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*/ |
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kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ |
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/* kernel size */ |
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ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); |
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memblock_reserve(kstart, ksize); |
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#if defined(CONFIG_BLK_DEV_INITRD) |
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/* Remove the init RAM disk from the available memory. */ |
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if (initrd_start) { |
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unsigned long size; |
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size = initrd_end - initrd_start; |
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memblock_reserve(__virt_to_phys(initrd_start), size); |
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} |
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#endif /* CONFIG_BLK_DEV_INITRD */ |
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/* Initialize the MMU hardware */ |
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mmu_init_hw(); |
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/* Map in all of RAM starting at CONFIG_KERNEL_START */ |
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mapin_ram(); |
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/* Extend vmalloc and ioremap area as big as possible */ |
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#ifdef CONFIG_HIGHMEM |
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ioremap_base = ioremap_bot = PKMAP_BASE; |
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#else |
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ioremap_base = ioremap_bot = FIXADDR_START; |
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#endif |
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/* Initialize the context management stuff */ |
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mmu_context_init(); |
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/* Shortly after that, the entire linear mapping will be available */ |
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/* This will also cause that unflatten device tree will be allocated |
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* inside 768MB limit */ |
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memblock_set_current_limit(memory_start + lowmem_size - 1); |
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parse_early_param(); |
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/* CMA initialization */ |
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dma_contiguous_reserve(memory_start + lowmem_size - 1); |
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} |
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/* This is only called until mem_init is done. */ |
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void __init *early_get_page(void) |
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{ |
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/* |
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* Mem start + kernel_tlb -> here is limit |
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* because of mem mapping from head.S |
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*/ |
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return memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE, |
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MEMBLOCK_LOW_LIMIT, memory_start + kernel_tlb, |
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NUMA_NO_NODE); |
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} |
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void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask) |
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{ |
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void *p; |
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if (mem_init_done) { |
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p = kzalloc(size, mask); |
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} else { |
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p = memblock_alloc(size, SMP_CACHE_BYTES); |
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if (!p) |
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panic("%s: Failed to allocate %zu bytes\n", |
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__func__, size); |
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} |
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return p; |
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}
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