/* * linux/arch/m32r/mm/init.c * * Copyright (c) 2001, 2002 Hitoshi Yamamoto * * Some code taken from sh version. * Copyright (C) 1999 Niibe Yutaka * Based on linux/arch/i386/mm/init.c: * Copyright (C) 1995 Linus Torvalds */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/pagemap.h> #include <linux/bootmem.h> #include <linux/swap.h> #include <linux/highmem.h> #include <linux/bitops.h> #include <linux/nodemask.h> #include <linux/pfn.h> #include <linux/gfp.h> #include <asm/types.h> #include <asm/processor.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/mmu_context.h> #include <asm/setup.h> #include <asm/tlb.h> #include <asm/sections.h> pgd_t swapper_pg_dir[1024]; /* * Cache of MMU context last used. */ #ifndef CONFIG_SMP unsigned long mmu_context_cache_dat; #else unsigned long mmu_context_cache_dat[NR_CPUS]; #endif /* * function prototype */ void __init paging_init(void); void __init mem_init(void); void free_initmem(void); #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long, unsigned long); #endif /* It'd be good if these lines were in the standard header file. */ #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn) #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn) #ifndef CONFIG_DISCONTIGMEM void __init zone_sizes_init(void) { unsigned long zones_size[MAX_NR_ZONES] = {0, }; unsigned long max_dma; unsigned long low; unsigned long start_pfn; #ifdef CONFIG_MMU start_pfn = START_PFN(0); max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; low = MAX_LOW_PFN(0); if (low < max_dma){ zones_size[ZONE_DMA] = low - start_pfn; zones_size[ZONE_NORMAL] = 0; } else { zones_size[ZONE_DMA] = low - start_pfn; zones_size[ZONE_NORMAL] = low - max_dma; } #else zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; start_pfn = __MEMORY_START >> PAGE_SHIFT; #endif /* CONFIG_MMU */ free_area_init_node(0, zones_size, start_pfn, 0); } #else /* CONFIG_DISCONTIGMEM */ extern void zone_sizes_init(void); #endif /* CONFIG_DISCONTIGMEM */ /*======================================================================* * paging_init() : sets up the page tables *======================================================================*/ void __init paging_init(void) { #ifdef CONFIG_MMU int i; pgd_t *pg_dir; /* We don't need kernel mapping as hardware support that. */ pg_dir = swapper_pg_dir; for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++) pgd_val(pg_dir[i]) = 0; #endif /* CONFIG_MMU */ zone_sizes_init(); } /*======================================================================* * mem_init() : * orig : arch/sh/mm/init.c *======================================================================*/ void __init mem_init(void) { #ifndef CONFIG_MMU extern unsigned long memory_end; high_memory = (void *)(memory_end & PAGE_MASK); #else high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0))); #endif /* CONFIG_MMU */ /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); set_max_mapnr(get_num_physpages()); free_all_bootmem(); mem_init_print_info(NULL); } /*======================================================================* * free_initmem() : * orig : arch/sh/mm/init.c *======================================================================*/ void free_initmem(void) { free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD /*======================================================================* * free_initrd_mem() : * orig : arch/sh/mm/init.c *======================================================================*/ void free_initrd_mem(unsigned long start, unsigned long end) { free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif