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- /* MN10300 Memory management initialisation
- *
- * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Modified by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/types.h>
- #include <linux/ptrace.h>
- #include <linux/mman.h>
- #include <linux/fs.h>
- #include <linux/mm.h>
- #include <linux/swap.h>
- #include <linux/smp.h>
- #include <linux/init.h>
- #include <linux/initrd.h>
- #include <linux/highmem.h>
- #include <linux/pagemap.h>
- #include <linux/bootmem.h>
- #include <linux/gfp.h>
- #include <asm/processor.h>
- #include <asm/uaccess.h>
- #include <asm/pgtable.h>
- #include <asm/pgalloc.h>
- #include <asm/dma.h>
- #include <asm/tlb.h>
- #include <asm/sections.h>
- unsigned long highstart_pfn, highend_pfn;
- #ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
- static struct vm_struct user_iomap_vm;
- #endif
- /*
- * set up paging
- */
- void __init paging_init(void)
- {
- unsigned long zones_size[MAX_NR_ZONES] = {0,};
- pte_t *ppte;
- int loop;
- /* main kernel space -> RAM mapping is handled as 1:1 transparent by
- * the MMU */
- memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
- memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
- /* load the VMALLOC area PTE table addresses into the kernel PGD */
- ppte = kernel_vmalloc_ptes;
- for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
- loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
- loop++
- ) {
- set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
- ppte += PAGE_SIZE / sizeof(pte_t);
- }
- /* declare the sizes of the RAM zones (only use the normal zone) */
- zones_size[ZONE_NORMAL] =
- contig_page_data.bdata->node_low_pfn -
- contig_page_data.bdata->node_min_pfn;
- /* pass the memory from the bootmem allocator to the main allocator */
- free_area_init(zones_size);
- #ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
- /* The Atomic Operation Unit registers need to be mapped to userspace
- * for all processes. The following uses vm_area_register_early() to
- * reserve the first page of the vmalloc area and sets the pte for that
- * page.
- *
- * glibc hardcodes this virtual mapping, so we're pretty much stuck with
- * it from now on.
- */
- user_iomap_vm.flags = VM_USERMAP;
- user_iomap_vm.size = 1 << PAGE_SHIFT;
- vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
- ppte = kernel_vmalloc_ptes;
- set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
- PAGE_USERIO));
- #endif
- local_flush_tlb_all();
- }
- /*
- * transfer all the memory from the bootmem allocator to the runtime allocator
- */
- void __init mem_init(void)
- {
- BUG_ON(!mem_map);
- #define START_PFN (contig_page_data.bdata->node_min_pfn)
- #define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn)
- max_mapnr = MAX_LOW_PFN - START_PFN;
- high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);
- /* clear the zero-page */
- memset(empty_zero_page, 0, PAGE_SIZE);
- /* this will put all low memory onto the freelists */
- free_all_bootmem();
- mem_init_print_info(NULL);
- }
- /*
- * recycle memory containing stuff only required for initialisation
- */
- void free_initmem(void)
- {
- free_initmem_default(POISON_FREE_INITMEM);
- }
- /*
- * dispose of the memory on which the initial ramdisk resided
- */
- #ifdef CONFIG_BLK_DEV_INITRD
- void free_initrd_mem(unsigned long start, unsigned long end)
- {
- free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
- "initrd");
- }
- #endif
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