mirror of https://gitee.com/openkylin/linux.git
227 lines
6.4 KiB
C
227 lines
6.4 KiB
C
/*
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* File: arch/blackfin/mm/init.c
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* Based on:
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* Author:
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright 2004-2007 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/swap.h>
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#include <linux/bootmem.h>
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#include <linux/uaccess.h>
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#include <asm/bfin-global.h>
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#include <asm/pda.h>
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#include <asm/cplbinit.h>
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#include "blackfin_sram.h"
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/*
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* BAD_PAGE is the page that is used for page faults when linux
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* is out-of-memory. Older versions of linux just did a
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* do_exit(), but using this instead means there is less risk
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* for a process dying in kernel mode, possibly leaving a inode
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* unused etc..
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*
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* BAD_PAGETABLE is the accompanying page-table: it is initialized
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* to point to BAD_PAGE entries.
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*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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*/
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static unsigned long empty_bad_page_table;
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static unsigned long empty_bad_page;
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unsigned long empty_zero_page;
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extern unsigned long exception_stack[NR_CPUS][1024];
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struct blackfin_pda cpu_pda[NR_CPUS];
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EXPORT_SYMBOL(cpu_pda);
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/*
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* paging_init() continues the virtual memory environment setup which
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* was begun by the code in arch/head.S.
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* The parameters are pointers to where to stick the starting and ending
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* addresses of available kernel virtual memory.
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*/
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void __init paging_init(void)
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{
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/*
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* make sure start_mem is page aligned, otherwise bootmem and
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* page_alloc get different views og the world
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*/
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unsigned long end_mem = memory_end & PAGE_MASK;
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pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
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/*
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* initialize the bad page table and bad page to point
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* to a couple of allocated pages
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*/
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empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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memset((void *)empty_zero_page, 0, PAGE_SIZE);
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/*
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* Set up SFC/DFC registers (user data space)
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*/
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set_fs(KERNEL_DS);
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pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
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PAGE_ALIGN(memory_start), end_mem);
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{
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unsigned long zones_size[MAX_NR_ZONES] = { 0, };
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zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
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zones_size[ZONE_NORMAL] = 0;
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#ifdef CONFIG_HIGHMEM
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zones_size[ZONE_HIGHMEM] = 0;
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#endif
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free_area_init(zones_size);
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}
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}
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asmlinkage void init_pda(void)
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{
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unsigned int cpu = raw_smp_processor_id();
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/* Initialize the PDA fields holding references to other parts
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of the memory. The content of such memory is still
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undefined at the time of the call, we are only setting up
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valid pointers to it. */
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memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu]));
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cpu_pda[0].next = &cpu_pda[1];
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cpu_pda[1].next = &cpu_pda[0];
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cpu_pda[cpu].ex_stack = exception_stack[cpu + 1];
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#ifdef CONFIG_MPU
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#else
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cpu_pda[cpu].ipdt = ipdt_tables[cpu];
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cpu_pda[cpu].dpdt = dpdt_tables[cpu];
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#ifdef CONFIG_CPLB_INFO
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cpu_pda[cpu].ipdt_swapcount = ipdt_swapcount_tables[cpu];
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cpu_pda[cpu].dpdt_swapcount = dpdt_swapcount_tables[cpu];
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#endif
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#endif
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#ifdef CONFIG_SMP
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cpu_pda[cpu].imask = 0x1f;
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#endif
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}
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void __cpuinit reserve_pda(void)
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{
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printk(KERN_INFO "PDA for CPU%u reserved at %p\n", smp_processor_id(),
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&cpu_pda[smp_processor_id()]);
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}
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void __init mem_init(void)
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{
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unsigned int codek = 0, datak = 0, initk = 0;
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unsigned int reservedpages = 0, freepages = 0;
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unsigned long tmp;
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unsigned long start_mem = memory_start;
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unsigned long end_mem = memory_end;
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end_mem &= PAGE_MASK;
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high_memory = (void *)end_mem;
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start_mem = PAGE_ALIGN(start_mem);
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max_mapnr = num_physpages = MAP_NR(high_memory);
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printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
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/* This will put all memory onto the freelists. */
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totalram_pages = free_all_bootmem();
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reservedpages = 0;
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for (tmp = 0; tmp < max_mapnr; tmp++)
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if (PageReserved(pfn_to_page(tmp)))
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reservedpages++;
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freepages = max_mapnr - reservedpages;
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/* do not count in kernel image between _rambase and _ramstart */
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reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
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#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
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reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
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#endif
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codek = (_etext - _stext) >> 10;
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initk = (__init_end - __init_begin) >> 10;
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datak = ((_ramstart - _rambase) >> 10) - codek - initk;
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printk(KERN_INFO
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"Memory available: %luk/%luk RAM, "
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"(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
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(unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
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initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));
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}
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static int __init sram_init(void)
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{
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/* Initialize the blackfin L1 Memory. */
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bfin_sram_init();
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/* Reserve the PDA space for the boot CPU right after we
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* initialized the scratch memory allocator.
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*/
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reserve_pda();
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return 0;
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}
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pure_initcall(sram_init);
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static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
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{
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unsigned long addr;
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/* next to check that the page we free is not a partial page */
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for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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{
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#ifndef CONFIG_MPU
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free_init_pages("initrd memory", start, end);
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#endif
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}
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#endif
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void __init_refok free_initmem(void)
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{
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#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
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free_init_pages("unused kernel memory",
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(unsigned long)(&__init_begin),
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(unsigned long)(&__init_end));
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#endif
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}
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