308 lines
7.8 KiB
C
308 lines
7.8 KiB
C
/*
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* Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/dma-map-ops.h>
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#include <linux/memblock.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h> /* mem_init */
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <linux/pagemap.h>
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#include <linux/pfn.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/export.h>
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#include <asm/page.h>
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#include <asm/mmu_context.h>
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#include <asm/pgalloc.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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#include <asm/fixmap.h>
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/* Use for MMU and noMMU because of PCI generic code */
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int mem_init_done;
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char *klimit = _end;
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/*
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* Initialize the bootmem system and give it all the memory we
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* have available.
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*/
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unsigned long memory_start;
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EXPORT_SYMBOL(memory_start);
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unsigned long memory_size;
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EXPORT_SYMBOL(memory_size);
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unsigned long lowmem_size;
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EXPORT_SYMBOL(min_low_pfn);
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EXPORT_SYMBOL(max_low_pfn);
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#ifdef CONFIG_HIGHMEM
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static void __init highmem_init(void)
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{
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pr_debug("%x\n", (u32)PKMAP_BASE);
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map_page(PKMAP_BASE, 0, 0); /* XXX gross */
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pkmap_page_table = virt_to_kpte(PKMAP_BASE);
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}
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static void __meminit highmem_setup(void)
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{
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unsigned long pfn;
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for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
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struct page *page = pfn_to_page(pfn);
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/* FIXME not sure about */
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if (!memblock_is_reserved(pfn << PAGE_SHIFT))
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free_highmem_page(page);
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}
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}
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#endif /* CONFIG_HIGHMEM */
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/*
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* paging_init() sets up the page tables - in fact we've already done this.
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*/
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static void __init paging_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES];
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int idx;
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/* Setup fixmaps */
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for (idx = 0; idx < __end_of_fixed_addresses; idx++)
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clear_fixmap(idx);
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/* Clean every zones */
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memset(zones_size, 0, sizeof(zones_size));
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#ifdef CONFIG_HIGHMEM
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highmem_init();
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zones_size[ZONE_DMA] = max_low_pfn;
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zones_size[ZONE_HIGHMEM] = max_pfn;
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#else
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zones_size[ZONE_DMA] = max_pfn;
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#endif
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/* We don't have holes in memory map */
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free_area_init(zones_size);
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}
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void __init setup_memory(void)
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{
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/*
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* Kernel:
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* start: base phys address of kernel - page align
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* end: base phys address of kernel - page align
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*
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* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
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* max_low_pfn
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* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
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*/
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/* memory start is from the kernel end (aligned) to higher addr */
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min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
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/* RAM is assumed contiguous */
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max_mapnr = memory_size >> PAGE_SHIFT;
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max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
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max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
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pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr);
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pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
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pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
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pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
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paging_init();
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}
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void __init mem_init(void)
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{
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high_memory = (void *)__va(memory_start + lowmem_size - 1);
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/* this will put all memory onto the freelists */
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memblock_free_all();
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#ifdef CONFIG_HIGHMEM
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highmem_setup();
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#endif
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mem_init_done = 1;
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}
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int page_is_ram(unsigned long pfn)
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{
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return pfn < max_low_pfn;
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}
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/*
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* Check for command-line options that affect what MMU_init will do.
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*/
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static void mm_cmdline_setup(void)
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{
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unsigned long maxmem = 0;
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char *p = cmd_line;
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/* Look for mem= option on command line */
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p = strstr(cmd_line, "mem=");
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if (p) {
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p += 4;
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maxmem = memparse(p, &p);
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if (maxmem && memory_size > maxmem) {
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memory_size = maxmem;
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memblock.memory.regions[0].size = memory_size;
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}
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}
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}
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/*
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* MMU_init_hw does the chip-specific initialization of the MMU hardware.
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*/
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static void __init mmu_init_hw(void)
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{
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/*
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* The Zone Protection Register (ZPR) defines how protection will
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* be applied to every page which is a member of a given zone. At
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* present, we utilize only two of the zones.
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* The zone index bits (of ZSEL) in the PTE are used for software
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* indicators, except the LSB. For user access, zone 1 is used,
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* for kernel access, zone 0 is used. We set all but zone 1
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* to zero, allowing only kernel access as indicated in the PTE.
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* For zone 1, we set a 01 binary (a value of 10 will not work)
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* to allow user access as indicated in the PTE. This also allows
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* kernel access as indicated in the PTE.
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*/
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__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
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"mts rzpr, r11;"
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: : : "r11");
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}
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/*
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* MMU_init sets up the basic memory mappings for the kernel,
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* including both RAM and possibly some I/O regions,
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* and sets up the page tables and the MMU hardware ready to go.
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*/
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/* called from head.S */
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asmlinkage void __init mmu_init(void)
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{
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unsigned int kstart, ksize;
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if (!memblock.reserved.cnt) {
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pr_emerg("Error memory count\n");
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machine_restart(NULL);
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}
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if ((u32) memblock.memory.regions[0].size < 0x400000) {
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pr_emerg("Memory must be greater than 4MB\n");
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machine_restart(NULL);
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}
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if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
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pr_emerg("Kernel size is greater than memory node\n");
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machine_restart(NULL);
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}
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/* Find main memory where the kernel is */
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memory_start = (u32) memblock.memory.regions[0].base;
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lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
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if (lowmem_size > CONFIG_LOWMEM_SIZE) {
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lowmem_size = CONFIG_LOWMEM_SIZE;
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#ifndef CONFIG_HIGHMEM
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memory_size = lowmem_size;
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#endif
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}
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mm_cmdline_setup(); /* FIXME parse args from command line - not used */
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/*
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* Map out the kernel text/data/bss from the available physical
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* memory.
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*/
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kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
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/* kernel size */
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ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
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memblock_reserve(kstart, ksize);
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#if defined(CONFIG_BLK_DEV_INITRD)
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/* Remove the init RAM disk from the available memory. */
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if (initrd_start) {
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unsigned long size;
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size = initrd_end - initrd_start;
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memblock_reserve(__virt_to_phys(initrd_start), size);
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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/* Initialize the MMU hardware */
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mmu_init_hw();
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/* Map in all of RAM starting at CONFIG_KERNEL_START */
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mapin_ram();
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/* Extend vmalloc and ioremap area as big as possible */
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#ifdef CONFIG_HIGHMEM
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ioremap_base = ioremap_bot = PKMAP_BASE;
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#else
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ioremap_base = ioremap_bot = FIXADDR_START;
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#endif
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/* Initialize the context management stuff */
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mmu_context_init();
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/* Shortly after that, the entire linear mapping will be available */
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/* This will also cause that unflatten device tree will be allocated
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* inside 768MB limit */
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memblock_set_current_limit(memory_start + lowmem_size - 1);
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parse_early_param();
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early_init_fdt_scan_reserved_mem();
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/* CMA initialization */
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dma_contiguous_reserve(memory_start + lowmem_size - 1);
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memblock_dump_all();
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}
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void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
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{
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void *p;
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if (mem_init_done) {
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p = kzalloc(size, mask);
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} else {
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p = memblock_alloc(size, SMP_CACHE_BYTES);
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if (!p)
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panic("%s: Failed to allocate %zu bytes\n",
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__func__, size);
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}
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return p;
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}
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static const pgprot_t protection_map[16] = {
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[VM_NONE] = PAGE_NONE,
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[VM_READ] = PAGE_READONLY_X,
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[VM_WRITE] = PAGE_COPY,
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[VM_WRITE | VM_READ] = PAGE_COPY_X,
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[VM_EXEC] = PAGE_READONLY,
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[VM_EXEC | VM_READ] = PAGE_READONLY_X,
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[VM_EXEC | VM_WRITE] = PAGE_COPY,
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X,
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[VM_SHARED] = PAGE_NONE,
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[VM_SHARED | VM_READ] = PAGE_READONLY_X,
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[VM_SHARED | VM_WRITE] = PAGE_SHARED,
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED_X,
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[VM_SHARED | VM_EXEC] = PAGE_READONLY,
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X,
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED,
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X
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};
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DECLARE_VM_GET_PAGE_PROT
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