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219 lines
5.2 KiB
219 lines
5.2 KiB
/* |
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* arch/xtensa/mm/init.c |
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* |
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* Derived from MIPS, PPC. |
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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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* Copyright (C) 2001 - 2005 Tensilica Inc. |
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* Copyright (C) 2014 - 2016 Cadence Design Systems Inc. |
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* |
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* Chris Zankel <[email protected]> |
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* Joe Taylor <[email protected], [email protected]> |
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* Marc Gauthier |
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* Kevin Chea |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/memblock.h> |
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#include <linux/gfp.h> |
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#include <linux/highmem.h> |
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#include <linux/swap.h> |
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#include <linux/mman.h> |
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#include <linux/nodemask.h> |
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#include <linux/mm.h> |
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#include <linux/of_fdt.h> |
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#include <linux/dma-map-ops.h> |
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#include <asm/bootparam.h> |
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#include <asm/page.h> |
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#include <asm/sections.h> |
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#include <asm/sysmem.h> |
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/* |
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* Initialize the bootmem system and give it all low memory we have available. |
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*/ |
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void __init bootmem_init(void) |
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{ |
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/* Reserve all memory below PHYS_OFFSET, as memory |
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* accounting doesn't work for pages below that address. |
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* |
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* If PHYS_OFFSET is zero reserve page at address 0: |
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* successfull allocations should never return NULL. |
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*/ |
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memblock_reserve(0, PHYS_OFFSET ? PHYS_OFFSET : 1); |
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early_init_fdt_scan_reserved_mem(); |
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if (!memblock_phys_mem_size()) |
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panic("No memory found!\n"); |
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min_low_pfn = PFN_UP(memblock_start_of_DRAM()); |
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min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET)); |
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max_pfn = PFN_DOWN(memblock_end_of_DRAM()); |
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max_low_pfn = min(max_pfn, MAX_LOW_PFN); |
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early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT, |
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(phys_addr_t)max_low_pfn << PAGE_SHIFT); |
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memblock_set_current_limit(PFN_PHYS(max_low_pfn)); |
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dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); |
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memblock_dump_all(); |
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} |
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void __init zones_init(void) |
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{ |
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/* All pages are DMA-able, so we put them all in the DMA zone. */ |
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { |
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[ZONE_NORMAL] = max_low_pfn, |
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#ifdef CONFIG_HIGHMEM |
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[ZONE_HIGHMEM] = max_pfn, |
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#endif |
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}; |
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free_area_init(max_zone_pfn); |
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} |
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static void __init free_highpages(void) |
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{ |
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#ifdef CONFIG_HIGHMEM |
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unsigned long max_low = max_low_pfn; |
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phys_addr_t range_start, range_end; |
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u64 i; |
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/* set highmem page free */ |
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for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, |
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&range_start, &range_end, NULL) { |
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unsigned long start = PFN_UP(range_start); |
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unsigned long end = PFN_DOWN(range_end); |
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/* Ignore complete lowmem entries */ |
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if (end <= max_low) |
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continue; |
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/* Truncate partial highmem entries */ |
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if (start < max_low) |
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start = max_low; |
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for (; start < end; start++) |
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free_highmem_page(pfn_to_page(start)); |
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} |
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#endif |
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} |
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/* |
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* Initialize memory pages. |
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*/ |
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void __init mem_init(void) |
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{ |
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free_highpages(); |
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max_mapnr = max_pfn - ARCH_PFN_OFFSET; |
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high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); |
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memblock_free_all(); |
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mem_init_print_info(NULL); |
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pr_info("virtual kernel memory layout:\n" |
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#ifdef CONFIG_KASAN |
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" kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" |
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#endif |
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#ifdef CONFIG_MMU |
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" vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" |
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#endif |
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#ifdef CONFIG_HIGHMEM |
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" pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" |
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" fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" |
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#endif |
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" lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" |
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" .text : 0x%08lx - 0x%08lx (%5lu kB)\n" |
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" .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" |
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" .data : 0x%08lx - 0x%08lx (%5lu kB)\n" |
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" .init : 0x%08lx - 0x%08lx (%5lu kB)\n" |
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" .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", |
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#ifdef CONFIG_KASAN |
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KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, |
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KASAN_SHADOW_SIZE >> 20, |
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#endif |
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#ifdef CONFIG_MMU |
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VMALLOC_START, VMALLOC_END, |
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(VMALLOC_END - VMALLOC_START) >> 20, |
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#ifdef CONFIG_HIGHMEM |
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PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, |
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(LAST_PKMAP*PAGE_SIZE) >> 10, |
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FIXADDR_START, FIXADDR_END, |
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(FIXADDR_END - FIXADDR_START) >> 10, |
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#endif |
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PAGE_OFFSET, PAGE_OFFSET + |
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(max_low_pfn - min_low_pfn) * PAGE_SIZE, |
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#else |
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min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, |
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#endif |
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((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, |
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(unsigned long)_text, (unsigned long)_etext, |
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(unsigned long)(_etext - _text) >> 10, |
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(unsigned long)__start_rodata, (unsigned long)__end_rodata, |
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(unsigned long)(__end_rodata - __start_rodata) >> 10, |
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(unsigned long)_sdata, (unsigned long)_edata, |
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(unsigned long)(_edata - _sdata) >> 10, |
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(unsigned long)__init_begin, (unsigned long)__init_end, |
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(unsigned long)(__init_end - __init_begin) >> 10, |
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(unsigned long)__bss_start, (unsigned long)__bss_stop, |
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(unsigned long)(__bss_stop - __bss_start) >> 10); |
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} |
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static void __init parse_memmap_one(char *p) |
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{ |
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char *oldp; |
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unsigned long start_at, mem_size; |
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if (!p) |
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return; |
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oldp = p; |
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mem_size = memparse(p, &p); |
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if (p == oldp) |
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return; |
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switch (*p) { |
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case '@': |
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start_at = memparse(p + 1, &p); |
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memblock_add(start_at, mem_size); |
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break; |
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case '$': |
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start_at = memparse(p + 1, &p); |
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memblock_reserve(start_at, mem_size); |
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break; |
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case 0: |
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memblock_reserve(mem_size, -mem_size); |
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break; |
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default: |
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pr_warn("Unrecognized memmap syntax: %s\n", p); |
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break; |
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} |
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} |
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static int __init parse_memmap_opt(char *str) |
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{ |
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while (str) { |
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char *k = strchr(str, ','); |
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if (k) |
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*k++ = 0; |
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parse_memmap_one(str); |
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str = k; |
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} |
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return 0; |
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} |
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early_param("memmap", parse_memmap_opt);
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