162 lines
4.5 KiB
C
162 lines
4.5 KiB
C
/*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/gfp.h>
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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 <asm/early_printk.h>
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#include "blackfin_sram.h"
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/*
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* ZERO_PAGE is a special page that is used for zero-initialized data and COW.
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* Let the bss do its zero-init magic so we don't have to do it ourselves.
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*/
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char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
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EXPORT_SYMBOL(empty_zero_page);
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#ifndef CONFIG_EXCEPTION_L1_SCRATCH
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#if defined CONFIG_SYSCALL_TAB_L1
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__attribute__((l1_data))
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#endif
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static unsigned long exception_stack[NR_CPUS][1024];
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#endif
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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 of the world
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*/
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unsigned long end_mem = memory_end & PAGE_MASK;
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unsigned long zones_size[MAX_NR_ZONES] = {
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[0] = 0,
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[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT,
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[ZONE_NORMAL] = 0,
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#ifdef CONFIG_HIGHMEM
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[ZONE_HIGHMEM] = 0,
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#endif
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};
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/* Set up SFC/DFC registers (user data space) */
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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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free_area_init(zones_size);
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}
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asmlinkage void __init init_pda(void)
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{
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unsigned int cpu = raw_smp_processor_id();
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early_shadow_stamp();
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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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#ifdef CONFIG_EXCEPTION_L1_SCRATCH
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cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \
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L1_SCRATCH_LENGTH);
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#else
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cpu_pda[cpu].ex_stack = exception_stack[cpu + 1];
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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 __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_EXTMEM_ICACHEABLE) && 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 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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