270 lines
6.2 KiB
C
270 lines
6.2 KiB
C
/*
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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 <chris@zankel.net>
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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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/bootmem.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-contiguous.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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if (PHYS_OFFSET)
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memblock_reserve(0, PHYS_OFFSET);
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else
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memblock_reserve(0, 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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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 zones_size[MAX_NR_ZONES] = {
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[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
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#ifdef CONFIG_HIGHMEM
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[ZONE_HIGHMEM] = max_pfn - max_low_pfn,
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#endif
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};
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free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
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}
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#ifdef CONFIG_HIGHMEM
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static void __init free_area_high(unsigned long pfn, unsigned long end)
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{
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for (; pfn < end; pfn++)
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free_highmem_page(pfn_to_page(pfn));
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}
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static void __init free_highpages(void)
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{
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unsigned long max_low = max_low_pfn;
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struct memblock_region *mem, *res;
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reset_all_zones_managed_pages();
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/* set highmem page free */
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for_each_memblock(memory, mem) {
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unsigned long start = memblock_region_memory_base_pfn(mem);
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unsigned long end = memblock_region_memory_end_pfn(mem);
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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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if (memblock_is_nomap(mem))
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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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/* Find and exclude any reserved regions */
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for_each_memblock(reserved, res) {
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unsigned long res_start, res_end;
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res_start = memblock_region_reserved_base_pfn(res);
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res_end = memblock_region_reserved_end_pfn(res);
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if (res_end < start)
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continue;
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if (res_start < start)
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res_start = start;
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if (res_start > end)
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res_start = end;
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if (res_end > end)
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res_end = end;
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if (res_start != start)
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free_area_high(start, res_start);
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start = res_end;
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if (start == end)
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break;
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}
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/* And now free anything which remains */
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if (start < end)
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free_area_high(start, end);
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}
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}
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#else
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static void __init free_highpages(void)
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{
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}
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#endif
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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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free_all_bootmem();
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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_TOP,
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(FIXADDR_TOP - 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)_sdata,
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(unsigned long)(_sdata - __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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#ifdef CONFIG_BLK_DEV_INITRD
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extern int initrd_is_mapped;
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (initrd_is_mapped)
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free_reserved_area((void *)start, (void *)end, -1, "initrd");
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}
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#endif
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void free_initmem(void)
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{
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free_initmem_default(-1);
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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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