diff options
Diffstat (limited to 'arch/score/mm/init.c')
| -rw-r--r-- | arch/score/mm/init.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/score/mm/init.c b/arch/score/mm/init.c new file mode 100644 index 00000000000..4e3dcd0c471 --- /dev/null +++ b/arch/score/mm/init.c @@ -0,0 +1,161 @@ +/* + * arch/score/mm/init.c + * + * Score Processor version. + * + * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. + * Lennox Wu <lennox.wu@sunplusct.com> + * Chen Liqin <liqin.chen@sunplusct.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/errno.h> +#include <linux/bootmem.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/pagemap.h> +#include <linux/proc_fs.h> +#include <linux/sched.h> +#include <linux/initrd.h> + +#include <asm/sections.h> +#include <asm/tlb.h> + +DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); + +unsigned long empty_zero_page; +EXPORT_SYMBOL_GPL(empty_zero_page); + +static struct kcore_list kcore_mem, kcore_vmalloc; + +static unsigned long setup_zero_page(void) +{ + struct page *page; + + empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0); + if (!empty_zero_page) + panic("Oh boy, that early out of memory?"); + + page = virt_to_page((void *) empty_zero_page); + SetPageReserved(page); + + return 1UL; +} + +#ifndef CONFIG_NEED_MULTIPLE_NODES +static int __init page_is_ram(unsigned long pagenr) +{ + if (pagenr >= min_low_pfn && pagenr < max_low_pfn) + return 1; + else + return 0; +} + +void __init paging_init(void) +{ + unsigned long max_zone_pfns[MAX_NR_ZONES]; + unsigned long lastpfn; + + pagetable_init(); + max_zone_pfns[ZONE_NORMAL] = max_low_pfn; + lastpfn = max_low_pfn; + free_area_init_nodes(max_zone_pfns); +} + +void __init mem_init(void) +{ + unsigned long codesize, reservedpages, datasize, initsize; + unsigned long tmp, ram = 0; + + max_mapnr = max_low_pfn; + high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); + totalram_pages += free_all_bootmem(); + totalram_pages -= setup_zero_page(); /* Setup zeroed pages. */ + reservedpages = 0; + + for (tmp = 0; tmp < max_low_pfn; tmp++) + if (page_is_ram(tmp)) { + ram++; + if (PageReserved(pfn_to_page(tmp))) + reservedpages++; + } + + num_physpages = ram; + codesize = (unsigned long) &_etext - (unsigned long) &_text; + datasize = (unsigned long) &_edata - (unsigned long) &_etext; + initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; + + kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); + kclist_add(&kcore_vmalloc, (void *) VMALLOC_START, + VMALLOC_END - VMALLOC_START); + + printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " + "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", + (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), + ram << (PAGE_SHIFT-10), codesize >> 10, + reservedpages << (PAGE_SHIFT-10), datasize >> 10, + initsize >> 10, + (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); +} +#endif /* !CONFIG_NEED_MULTIPLE_NODES */ + +static void free_init_pages(const char *what, unsigned long begin, unsigned long end) +{ + unsigned long pfn; + + for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { + struct page *page = pfn_to_page(pfn); + void *addr = phys_to_virt(PFN_PHYS(pfn)); + + ClearPageReserved(page); + init_page_count(page); + memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); + __free_page(page); + totalram_pages++; + } + printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_init_pages("initrd memory", + virt_to_phys((void *) start), + virt_to_phys((void *) end)); +} +#endif + +void __init_refok free_initmem(void) +{ + free_init_pages("unused kernel memory", + __pa(&__init_begin), + __pa(&__init_end)); +} + +unsigned long pgd_current; + +#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order))) + +/* + * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER + * are constants. So we use the variants from asm-offset.h until that gcc + * will officially be retired. + */ +pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER); +pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); |