diff options
Diffstat (limited to 'arch/avr32/mm/init.c')
| -rw-r--r-- | arch/avr32/mm/init.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c new file mode 100644 index 000000000..def5391d9 --- /dev/null +++ b/arch/avr32/mm/init.c @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/gfp.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/init.h> +#include <linux/mmzone.h> +#include <linux/module.h> +#include <linux/bootmem.h> +#include <linux/pagemap.h> +#include <linux/nodemask.h> + +#include <asm/page.h> +#include <asm/mmu_context.h> +#include <asm/tlb.h> +#include <asm/io.h> +#include <asm/dma.h> +#include <asm/setup.h> +#include <asm/sections.h> + +pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data; + +struct page *empty_zero_page; +EXPORT_SYMBOL(empty_zero_page); + +/* + * Cache of MMU context last used. + */ +unsigned long mmu_context_cache = NO_CONTEXT; + +/* + * paging_init() sets up the page tables + * + * This routine also unmaps the page at virtual kernel address 0, so + * that we can trap those pesky NULL-reference errors in the kernel. + */ +void __init paging_init(void) +{ + extern unsigned long _evba; + void *zero_page; + int nid; + + /* + * Make sure we can handle exceptions before enabling + * paging. Not that we should ever _get_ any exceptions this + * early, but you never know... + */ + printk("Exception vectors start at %p\n", &_evba); + sysreg_write(EVBA, (unsigned long)&_evba); + + /* + * Since we are ready to handle exceptions now, we should let + * the CPU generate them... + */ + __asm__ __volatile__ ("csrf %0" : : "i"(SR_EM_BIT)); + + /* + * Allocate the zero page. The allocator will panic if it + * can't satisfy the request, so no need to check. + */ + zero_page = alloc_bootmem_low_pages_node(NODE_DATA(0), + PAGE_SIZE); + + sysreg_write(PTBR, (unsigned long)swapper_pg_dir); + enable_mmu(); + printk ("CPU: Paging enabled\n"); + + for_each_online_node(nid) { + pg_data_t *pgdat = NODE_DATA(nid); + unsigned long zones_size[MAX_NR_ZONES]; + unsigned long low, start_pfn; + + start_pfn = pgdat->bdata->node_min_pfn; + low = pgdat->bdata->node_low_pfn; + + memset(zones_size, 0, sizeof(zones_size)); + zones_size[ZONE_NORMAL] = low - start_pfn; + + printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", + nid, start_pfn, low); + + free_area_init_node(nid, zones_size, start_pfn, NULL); + + printk("Node %u: mem_map starts at %p\n", + pgdat->node_id, pgdat->node_mem_map); + } + + mem_map = NODE_DATA(0)->node_mem_map; + + empty_zero_page = virt_to_page(zero_page); + flush_dcache_page(empty_zero_page); +} + +void __init mem_init(void) +{ + pg_data_t *pgdat; + + high_memory = NULL; + for_each_online_pgdat(pgdat) + high_memory = max_t(void *, high_memory, + __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); + + set_max_mapnr(MAP_NR(high_memory)); + free_all_bootmem(); + mem_init_print_info(NULL); +} + +void free_initmem(void) +{ + free_initmem_default(-1); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, -1, "initrd"); +} +#endif |