29eb45a9ab
All arches do essentially the same thing now for early_init_dt_setup_initrd_arch, so it can now be removed. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: x86@kernel.org Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Acked-by: Grant Likely <grant.likely@linaro.org>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/swap.h>
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#include <linux/module.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/sections.h>
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#include <asm/arcregs.h>
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
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char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
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EXPORT_SYMBOL(empty_zero_page);
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/* Default tot mem from .config */
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static unsigned long arc_mem_sz = 0x20000000; /* some default */
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/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
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static int __init setup_mem_sz(char *str)
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{
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arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
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/* early console might not be setup yet - it will show up later */
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pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
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return 0;
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}
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early_param("mem", setup_mem_sz);
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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arc_mem_sz = size & PAGE_MASK;
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pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
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}
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/*
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* First memory setup routine called from setup_arch()
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* 1. setup swapper's mm @init_mm
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* 2. Count the pages we have and setup bootmem allocator
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* 3. zone setup
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*/
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void __init setup_arch_memory(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = { 0, 0 };
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unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
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init_mm.start_code = (unsigned long)_text;
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init_mm.end_code = (unsigned long)_etext;
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init_mm.end_data = (unsigned long)_edata;
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init_mm.brk = (unsigned long)_end;
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/*
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* We do it here, so that memory is correctly instantiated
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* even if "mem=xxx" cmline over-ride is given and/or
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* DT has memory node. Each causes an update to @arc_mem_sz
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* and we finally add memory one here
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*/
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memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
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/*------------- externs in mm need setting up ---------------*/
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/* first page of system - kernel .vector starts here */
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min_low_pfn = PFN_DOWN(CONFIG_LINUX_LINK_BASE);
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/* Last usable page of low mem (no HIGHMEM yet for ARC port) */
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max_low_pfn = max_pfn = PFN_DOWN(end_mem);
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max_mapnr = max_low_pfn - min_low_pfn;
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/*------------- reserve kernel image -----------------------*/
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memblock_reserve(CONFIG_LINUX_LINK_BASE,
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__pa(_end) - CONFIG_LINUX_LINK_BASE);
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memblock_dump_all();
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/*-------------- node setup --------------------------------*/
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memset(zones_size, 0, sizeof(zones_size));
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zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
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/*
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* We can't use the helper free_area_init(zones[]) because it uses
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* PAGE_OFFSET to compute the @min_low_pfn which would be wrong
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* when our kernel doesn't start at PAGE_OFFSET, i.e.
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* PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
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*/
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free_area_init_node(0, /* node-id */
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zones_size, /* num pages per zone */
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min_low_pfn, /* first pfn of node */
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NULL); /* NO holes */
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}
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/*
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* mem_init - initializes memory
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*
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* Frees up bootmem
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* Calculates and displays memory available/used
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*/
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void __init mem_init(void)
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{
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high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
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free_all_bootmem();
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mem_init_print_info(NULL);
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}
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/*
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* free_initmem: Free all the __init memory.
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*/
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void __init_refok free_initmem(void)
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{
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free_initmem_default(-1);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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{
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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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