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152 lines
3.8 KiB
152 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m32r/mm/init.c
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*
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* Copyright (c) 2001, 2002 Hitoshi Yamamoto
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*
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* Some code taken from sh version.
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* Copyright (C) 1999 Niibe Yutaka
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* Based on linux/arch/i386/mm/init.c:
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/swap.h>
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#include <linux/highmem.h>
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#include <linux/bitops.h>
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#include <linux/nodemask.h>
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#include <linux/pfn.h>
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#include <linux/gfp.h>
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#include <asm/types.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/setup.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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pgd_t swapper_pg_dir[1024];
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/*
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* Cache of MMU context last used.
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*/
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#ifndef CONFIG_SMP
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unsigned long mmu_context_cache_dat;
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#else
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unsigned long mmu_context_cache_dat[NR_CPUS];
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#endif
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/*
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* function prototype
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*/
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void __init paging_init(void);
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void __init mem_init(void);
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void free_initmem(void);
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long, unsigned long);
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#endif
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/* It'd be good if these lines were in the standard header file. */
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#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
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#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
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#ifndef CONFIG_DISCONTIGMEM
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void __init zone_sizes_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0, };
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unsigned long start_pfn;
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#ifdef CONFIG_MMU
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{
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unsigned long low;
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unsigned long max_dma;
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start_pfn = START_PFN(0);
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max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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low = MAX_LOW_PFN(0);
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if (low < max_dma) {
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zones_size[ZONE_DMA] = low - start_pfn;
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zones_size[ZONE_NORMAL] = 0;
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} else {
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zones_size[ZONE_DMA] = low - start_pfn;
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zones_size[ZONE_NORMAL] = low - max_dma;
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}
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}
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#else
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zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
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zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
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start_pfn = __MEMORY_START >> PAGE_SHIFT;
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#endif /* CONFIG_MMU */
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free_area_init_node(0, zones_size, start_pfn, 0);
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}
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#else /* CONFIG_DISCONTIGMEM */
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extern void zone_sizes_init(void);
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#endif /* CONFIG_DISCONTIGMEM */
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/*======================================================================*
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* paging_init() : sets up the page tables
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*======================================================================*/
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void __init paging_init(void)
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{
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#ifdef CONFIG_MMU
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int i;
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pgd_t *pg_dir;
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/* We don't need kernel mapping as hardware support that. */
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pg_dir = swapper_pg_dir;
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for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
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pgd_val(pg_dir[i]) = 0;
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#endif /* CONFIG_MMU */
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zone_sizes_init();
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}
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/*======================================================================*
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* mem_init() :
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* orig : arch/sh/mm/init.c
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*======================================================================*/
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void __init mem_init(void)
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{
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#ifndef CONFIG_MMU
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extern unsigned long memory_end;
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high_memory = (void *)(memory_end & PAGE_MASK);
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#else
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high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
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#endif /* CONFIG_MMU */
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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set_max_mapnr(get_num_physpages());
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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() :
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* orig : arch/sh/mm/init.c
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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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/*======================================================================*
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* free_initrd_mem() :
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* orig : arch/sh/mm/init.c
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*======================================================================*/
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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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