126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
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/*
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* Copyright (C) 2004-2006 Atmel Corporation
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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/gfp.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/mmzone.h>
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#include <linux/module.h>
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#include <linux/bootmem.h>
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#include <linux/pagemap.h>
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#include <linux/nodemask.h>
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#include <asm/page.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data;
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struct page *empty_zero_page;
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EXPORT_SYMBOL(empty_zero_page);
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/*
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* Cache of MMU context last used.
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*/
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unsigned long mmu_context_cache = NO_CONTEXT;
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/*
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* paging_init() sets up the page tables
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*
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* This routine also unmaps the page at virtual kernel address 0, so
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* that we can trap those pesky NULL-reference errors in the kernel.
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*/
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void __init paging_init(void)
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{
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extern unsigned long _evba;
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void *zero_page;
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int nid;
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/*
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* Make sure we can handle exceptions before enabling
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* paging. Not that we should ever _get_ any exceptions this
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* early, but you never know...
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*/
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printk("Exception vectors start at %p\n", &_evba);
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sysreg_write(EVBA, (unsigned long)&_evba);
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/*
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* Since we are ready to handle exceptions now, we should let
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* the CPU generate them...
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*/
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__asm__ __volatile__ ("csrf %0" : : "i"(SR_EM_BIT));
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/*
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* Allocate the zero page. The allocator will panic if it
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* can't satisfy the request, so no need to check.
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*/
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zero_page = alloc_bootmem_low_pages_node(NODE_DATA(0),
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PAGE_SIZE);
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sysreg_write(PTBR, (unsigned long)swapper_pg_dir);
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enable_mmu();
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printk ("CPU: Paging enabled\n");
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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unsigned long zones_size[MAX_NR_ZONES];
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unsigned long low, start_pfn;
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start_pfn = pgdat->bdata->node_min_pfn;
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low = pgdat->bdata->node_low_pfn;
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memset(zones_size, 0, sizeof(zones_size));
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zones_size[ZONE_NORMAL] = low - start_pfn;
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printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
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nid, start_pfn, low);
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free_area_init_node(nid, zones_size, start_pfn, NULL);
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printk("Node %u: mem_map starts at %p\n",
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pgdat->node_id, pgdat->node_mem_map);
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}
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mem_map = NODE_DATA(0)->node_mem_map;
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empty_zero_page = virt_to_page(zero_page);
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flush_dcache_page(empty_zero_page);
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}
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void __init mem_init(void)
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{
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pg_data_t *pgdat;
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high_memory = NULL;
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for_each_online_pgdat(pgdat)
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high_memory = max_t(void *, high_memory,
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__va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
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set_max_mapnr(MAP_NR(high_memory));
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free_all_bootmem();
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mem_init_print_info(NULL);
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}
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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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#ifdef CONFIG_BLK_DEV_INITRD
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void 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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