188 строки
4.7 KiB
C
188 строки
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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/memblock.h>
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#ifdef CONFIG_BLK_DEV_INITRD
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#include <linux/initrd.h>
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#endif
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#include <linux/of_fdt.h>
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#include <linux/swap.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <asm/page.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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static const unsigned long low_mem_start = CONFIG_LINUX_RAM_BASE;
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static unsigned long low_mem_sz;
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#ifdef CONFIG_HIGHMEM
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static unsigned long min_high_pfn, max_high_pfn;
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static u64 high_mem_start;
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static u64 high_mem_sz;
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#endif
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#ifdef CONFIG_DISCONTIGMEM
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struct pglist_data node_data[MAX_NUMNODES] __read_mostly;
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EXPORT_SYMBOL(node_data);
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#endif
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long __init arc_get_mem_sz(void)
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{
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return low_mem_sz;
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}
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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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low_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(low_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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int in_use = 0;
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if (!low_mem_sz) {
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if (base != low_mem_start)
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panic("CONFIG_LINUX_RAM_BASE != DT memory { }");
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low_mem_sz = size;
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in_use = 1;
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memblock_add_node(base, size, 0);
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} else {
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#ifdef CONFIG_HIGHMEM
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high_mem_start = base;
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high_mem_sz = size;
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in_use = 1;
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memblock_add_node(base, size, 1);
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#endif
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}
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pr_info("Memory @ %llx [%lldM] %s\n",
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base, TO_MB(size), !in_use ? "Not used":"");
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}
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bool arch_has_descending_max_zone_pfns(void)
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{
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return !IS_ENABLED(CONFIG_ARC_HAS_PAE40);
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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 max_zone_pfn[MAX_NR_ZONES] = { 0 };
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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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/* first page of system - kernel .vector starts here */
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min_low_pfn = ARCH_PFN_OFFSET;
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/* Last usable page of low mem */
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max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
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#ifdef CONFIG_FLATMEM
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/* pfn_valid() uses this */
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max_mapnr = max_low_pfn - min_low_pfn;
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#endif
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/*------------- bootmem allocator setup -----------------------*/
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/*
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* seed the bootmem allocator after any DT memory node parsing or
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* "mem=xxx" cmdline overrides have potentially updated @arc_mem_sz
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*
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* Only low mem is added, otherwise we have crashes when allocating
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* mem_map[] itself. NO_BOOTMEM allocates mem_map[] at the end of
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* avail memory, ending in highmem with a > 32-bit address. However
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* it then tries to memset it with a truncaed 32-bit handle, causing
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* the crash
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*/
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memblock_reserve(CONFIG_LINUX_LINK_BASE,
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__pa(_end) - CONFIG_LINUX_LINK_BASE);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (phys_initrd_size) {
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memblock_reserve(phys_initrd_start, phys_initrd_size);
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initrd_start = (unsigned long)__va(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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#endif
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early_init_fdt_reserve_self();
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early_init_fdt_scan_reserved_mem();
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memblock_dump_all();
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/*----------------- node/zones setup --------------------------*/
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max_zone_pfn[ZONE_NORMAL] = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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/*
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* Populate a new node with highmem
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*
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* On ARC (w/o PAE) HIGHMEM addresses are actually smaller (0 based)
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* than addresses in normal ala low memory (0x8000_0000 based).
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* Even with PAE, the huge peripheral space hole would waste a lot of
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* mem with single mem_map[]. This warrants a mem_map per region design.
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* Thus HIGHMEM on ARC is imlemented with DISCONTIGMEM.
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*
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* DISCONTIGMEM in turns requires multiple nodes. node 0 above is
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* populated with normal memory zone while node 1 only has highmem
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*/
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node_set_online(1);
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min_high_pfn = PFN_DOWN(high_mem_start);
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max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
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max_zone_pfn[ZONE_HIGHMEM] = max_high_pfn;
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high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
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kmap_init();
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#endif
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free_area_init(max_zone_pfn);
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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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#ifdef CONFIG_HIGHMEM
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unsigned long tmp;
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reset_all_zones_managed_pages();
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for (tmp = min_high_pfn; tmp < max_high_pfn; tmp++)
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free_highmem_page(pfn_to_page(tmp));
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#endif
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memblock_free_all();
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mem_init_print_info(NULL);
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}
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