mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 08:01:59 +00:00
8ceafbfa91
Pull DMA mask updates from Russell King:
"This series cleans up the handling of DMA masks in a lot of drivers,
fixing some bugs as we go.
Some of the more serious errors include:
- drivers which only set their coherent DMA mask if the attempt to
set the streaming mask fails.
- drivers which test for a NULL dma mask pointer, and then set the
dma mask pointer to a location in their module .data section -
which will cause problems if the module is reloaded.
To counter these, I have introduced two helper functions:
- dma_set_mask_and_coherent() takes care of setting both the
streaming and coherent masks at the same time, with the correct
error handling as specified by the API.
- dma_coerce_mask_and_coherent() which resolves the problem of
drivers forcefully setting DMA masks. This is more a marker for
future work to further clean these locations up - the code which
creates the devices really should be initialising these, but to fix
that in one go along with this change could potentially be very
disruptive.
The last thing this series does is prise away some of Linux's addition
to "DMA addresses are physical addresses and RAM always starts at
zero". We have ARM LPAE systems where all system memory is above 4GB
physical, hence having DMA masks interpreted by (eg) the block layers
as describing physical addresses in the range 0..DMAMASK fails on
these platforms. Santosh Shilimkar addresses this in this series; the
patches were copied to the appropriate people multiple times but were
ignored.
Fixing this also gets rid of some ARM weirdness in the setup of the
max*pfn variables, and brings ARM into line with every other Linux
architecture as far as those go"
* 'for-linus-dma-masks' of git://git.linaro.org/people/rmk/linux-arm: (52 commits)
ARM: 7805/1: mm: change max*pfn to include the physical offset of memory
ARM: 7797/1: mmc: Use dma_max_pfn(dev) helper for bounce_limit calculations
ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper for bounce_limit calculations
ARM: 7795/1: mm: dma-mapping: Add dma_max_pfn(dev) helper function
ARM: 7794/1: block: Rename parameter dma_mask to max_addr for blk_queue_bounce_limit()
ARM: DMA-API: better handing of DMA masks for coherent allocations
ARM: 7857/1: dma: imx-sdma: setup dma mask
DMA-API: firmware/google/gsmi.c: avoid direct access to DMA masks
DMA-API: dcdbas: update DMA mask handing
DMA-API: dma: edma.c: no need to explicitly initialize DMA masks
DMA-API: usb: musb: use platform_device_register_full() to avoid directly messing with dma masks
DMA-API: crypto: remove last references to 'static struct device *dev'
DMA-API: crypto: fix ixp4xx crypto platform device support
DMA-API: others: use dma_set_coherent_mask()
DMA-API: staging: use dma_set_coherent_mask()
DMA-API: usb: use new dma_coerce_mask_and_coherent()
DMA-API: usb: use dma_set_coherent_mask()
DMA-API: parport: parport_pc.c: use dma_coerce_mask_and_coherent()
DMA-API: net: octeon: use dma_coerce_mask_and_coherent()
DMA-API: net: nxp/lpc_eth: use dma_coerce_mask_and_coherent()
...
714 lines
18 KiB
C
714 lines
18 KiB
C
/*
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* linux/arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mman.h>
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#include <linux/export.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/dma-contiguous.h>
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#include <linux/sizes.h>
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#include <asm/mach-types.h>
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#include <asm/memblock.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/tlb.h>
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#include <asm/fixmap.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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static phys_addr_t phys_initrd_start __initdata = 0;
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static unsigned long phys_initrd_size __initdata = 0;
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static int __init early_initrd(char *p)
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{
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phys_addr_t start;
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unsigned long size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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phys_initrd_start = start;
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phys_initrd_size = size;
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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static int __init parse_tag_initrd(const struct tag *tag)
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{
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printk(KERN_WARNING "ATAG_INITRD is deprecated; "
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"please update your bootloader.\n");
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phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD, parse_tag_initrd);
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static int __init parse_tag_initrd2(const struct tag *tag)
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{
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phys_initrd_start = tag->u.initrd.start;
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD2, parse_tag_initrd2);
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/*
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* This keeps memory configuration data used by a couple memory
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* initialization functions, as well as show_mem() for the skipping
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* of holes in the memory map. It is populated by arm_add_memory().
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*/
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struct meminfo meminfo;
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void show_mem(unsigned int filter)
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{
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int free = 0, total = 0, reserved = 0;
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int shared = 0, cached = 0, slab = 0, i;
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struct meminfo * mi = &meminfo;
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printk("Mem-info:\n");
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show_free_areas(filter);
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if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
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return;
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for_each_bank (i, mi) {
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struct membank *bank = &mi->bank[i];
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unsigned int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = bank_pfn_start(bank);
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pfn2 = bank_pfn_end(bank);
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page = pfn_to_page(pfn1);
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end = pfn_to_page(pfn2 - 1) + 1;
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do {
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (PageSlab(page))
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slab++;
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else if (!page_count(page))
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free++;
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else
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shared += page_count(page) - 1;
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page++;
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} while (page < end);
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}
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printk("%d pages of RAM\n", total);
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printk("%d free pages\n", free);
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printk("%d reserved pages\n", reserved);
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printk("%d slab pages\n", slab);
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printk("%d pages shared\n", shared);
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printk("%d pages swap cached\n", cached);
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}
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static void __init find_limits(unsigned long *min, unsigned long *max_low,
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unsigned long *max_high)
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{
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struct meminfo *mi = &meminfo;
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int i;
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/* This assumes the meminfo array is properly sorted */
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*min = bank_pfn_start(&mi->bank[0]);
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for_each_bank (i, mi)
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if (mi->bank[i].highmem)
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break;
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*max_low = bank_pfn_end(&mi->bank[i - 1]);
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*max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
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}
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static void __init arm_bootmem_init(unsigned long start_pfn,
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unsigned long end_pfn)
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{
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struct memblock_region *reg;
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unsigned int boot_pages;
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phys_addr_t bitmap;
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pg_data_t *pgdat;
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/*
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* Allocate the bootmem bitmap page. This must be in a region
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* of memory which has already been mapped.
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*/
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boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
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__pfn_to_phys(end_pfn));
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/*
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* Initialise the bootmem allocator, handing the
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* memory banks over to bootmem.
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*/
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node_set_online(0);
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pgdat = NODE_DATA(0);
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init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
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/* Free the lowmem regions from memblock into bootmem. */
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (end >= end_pfn)
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end = end_pfn;
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if (start >= end)
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break;
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free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
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}
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/* Reserve the lowmem memblock reserved regions in bootmem. */
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for_each_memblock(reserved, reg) {
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unsigned long start = memblock_region_reserved_base_pfn(reg);
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unsigned long end = memblock_region_reserved_end_pfn(reg);
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if (end >= end_pfn)
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end = end_pfn;
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if (start >= end)
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break;
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reserve_bootmem(__pfn_to_phys(start),
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(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
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}
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}
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#ifdef CONFIG_ZONE_DMA
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phys_addr_t arm_dma_zone_size __read_mostly;
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EXPORT_SYMBOL(arm_dma_zone_size);
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/*
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* The DMA mask corresponding to the maximum bus address allocatable
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* using GFP_DMA. The default here places no restriction on DMA
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* allocations. This must be the smallest DMA mask in the system,
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* so a successful GFP_DMA allocation will always satisfy this.
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*/
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phys_addr_t arm_dma_limit;
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unsigned long arm_dma_pfn_limit;
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static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
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unsigned long dma_size)
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{
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if (size[0] <= dma_size)
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return;
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size[ZONE_NORMAL] = size[0] - dma_size;
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size[ZONE_DMA] = dma_size;
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hole[ZONE_NORMAL] = hole[0];
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hole[ZONE_DMA] = 0;
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}
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#endif
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void __init setup_dma_zone(const struct machine_desc *mdesc)
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{
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#ifdef CONFIG_ZONE_DMA
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if (mdesc->dma_zone_size) {
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arm_dma_zone_size = mdesc->dma_zone_size;
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arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
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} else
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arm_dma_limit = 0xffffffff;
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arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT;
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#endif
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}
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static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
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unsigned long max_high)
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{
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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struct memblock_region *reg;
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/*
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* initialise the zones.
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*/
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memset(zone_size, 0, sizeof(zone_size));
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/*
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* The memory size has already been determined. If we need
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* to do anything fancy with the allocation of this memory
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* to the zones, now is the time to do it.
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*/
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zone_size[0] = max_low - min;
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#ifdef CONFIG_HIGHMEM
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zone_size[ZONE_HIGHMEM] = max_high - max_low;
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#endif
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/*
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* Calculate the size of the holes.
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* holes = node_size - sum(bank_sizes)
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*/
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memcpy(zhole_size, zone_size, sizeof(zhole_size));
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (start < max_low) {
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unsigned long low_end = min(end, max_low);
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zhole_size[0] -= low_end - start;
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}
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#ifdef CONFIG_HIGHMEM
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if (end > max_low) {
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unsigned long high_start = max(start, max_low);
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zhole_size[ZONE_HIGHMEM] -= end - high_start;
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}
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#endif
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}
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#ifdef CONFIG_ZONE_DMA
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/*
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* Adjust the sizes according to any special requirements for
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* this machine type.
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*/
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if (arm_dma_zone_size)
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arm_adjust_dma_zone(zone_size, zhole_size,
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arm_dma_zone_size >> PAGE_SHIFT);
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#endif
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free_area_init_node(0, zone_size, min, zhole_size);
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}
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#ifdef CONFIG_HAVE_ARCH_PFN_VALID
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int pfn_valid(unsigned long pfn)
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{
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return memblock_is_memory(__pfn_to_phys(pfn));
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}
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EXPORT_SYMBOL(pfn_valid);
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#endif
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#ifndef CONFIG_SPARSEMEM
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static void __init arm_memory_present(void)
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{
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}
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#else
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static void __init arm_memory_present(void)
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{
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struct memblock_region *reg;
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for_each_memblock(memory, reg)
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memory_present(0, memblock_region_memory_base_pfn(reg),
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memblock_region_memory_end_pfn(reg));
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}
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#endif
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static bool arm_memblock_steal_permitted = true;
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phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
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{
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phys_addr_t phys;
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BUG_ON(!arm_memblock_steal_permitted);
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phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
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memblock_free(phys, size);
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memblock_remove(phys, size);
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return phys;
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}
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void __init arm_memblock_init(struct meminfo *mi,
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const struct machine_desc *mdesc)
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{
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int i;
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for (i = 0; i < mi->nr_banks; i++)
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memblock_add(mi->bank[i].start, mi->bank[i].size);
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/* Register the kernel text, kernel data and initrd with memblock. */
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#ifdef CONFIG_XIP_KERNEL
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memblock_reserve(__pa(_sdata), _end - _sdata);
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#else
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memblock_reserve(__pa(_stext), _end - _stext);
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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/* FDT scan will populate initrd_start */
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if (initrd_start) {
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phys_initrd_start = __virt_to_phys(initrd_start);
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phys_initrd_size = initrd_end - initrd_start;
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}
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if (phys_initrd_size &&
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!memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
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pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
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(u64)phys_initrd_start, phys_initrd_size);
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phys_initrd_start = phys_initrd_size = 0;
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}
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if (phys_initrd_size &&
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memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
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pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
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(u64)phys_initrd_start, phys_initrd_size);
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phys_initrd_start = phys_initrd_size = 0;
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}
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if (phys_initrd_size) {
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memblock_reserve(phys_initrd_start, phys_initrd_size);
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/* Now convert initrd to virtual addresses */
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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#endif
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arm_mm_memblock_reserve();
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arm_dt_memblock_reserve();
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/* reserve any platform specific memblock areas */
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if (mdesc->reserve)
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mdesc->reserve();
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/*
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* reserve memory for DMA contigouos allocations,
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* must come from DMA area inside low memory
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*/
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dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
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arm_memblock_steal_permitted = false;
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memblock_allow_resize();
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memblock_dump_all();
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}
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void __init bootmem_init(void)
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{
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unsigned long min, max_low, max_high;
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max_low = max_high = 0;
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find_limits(&min, &max_low, &max_high);
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arm_bootmem_init(min, max_low);
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/*
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* Sparsemem tries to allocate bootmem in memory_present(),
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* so must be done after the fixed reservations
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*/
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arm_memory_present();
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/*
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* sparse_init() needs the bootmem allocator up and running.
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*/
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sparse_init();
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/*
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* Now free the memory - free_area_init_node needs
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* the sparse mem_map arrays initialized by sparse_init()
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* for memmap_init_zone(), otherwise all PFNs are invalid.
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*/
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arm_bootmem_free(min, max_low, max_high);
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/*
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* This doesn't seem to be used by the Linux memory manager any
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* more, but is used by ll_rw_block. If we can get rid of it, we
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* also get rid of some of the stuff above as well.
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*/
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min_low_pfn = min;
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max_low_pfn = max_low;
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max_pfn = max_high;
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}
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/*
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* Poison init memory with an undefined instruction (ARM) or a branch to an
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* undefined instruction (Thumb).
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*/
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static inline void poison_init_mem(void *s, size_t count)
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{
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u32 *p = (u32 *)s;
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for (; count != 0; count -= 4)
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*p++ = 0xe7fddef0;
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}
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static inline void
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free_memmap(unsigned long start_pfn, unsigned long end_pfn)
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{
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struct page *start_pg, *end_pg;
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phys_addr_t pg, pgend;
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/*
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* Convert start_pfn/end_pfn to a struct page pointer.
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*/
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start_pg = pfn_to_page(start_pfn - 1) + 1;
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end_pg = pfn_to_page(end_pfn - 1) + 1;
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/*
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* Convert to physical addresses, and
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* round start upwards and end downwards.
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*/
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pg = PAGE_ALIGN(__pa(start_pg));
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pgend = __pa(end_pg) & PAGE_MASK;
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|
|
/*
|
|
* If there are free pages between these,
|
|
* free the section of the memmap array.
|
|
*/
|
|
if (pg < pgend)
|
|
free_bootmem(pg, pgend - pg);
|
|
}
|
|
|
|
/*
|
|
* The mem_map array can get very big. Free the unused area of the memory map.
|
|
*/
|
|
static void __init free_unused_memmap(struct meminfo *mi)
|
|
{
|
|
unsigned long bank_start, prev_bank_end = 0;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* This relies on each bank being in address order.
|
|
* The banks are sorted previously in bootmem_init().
|
|
*/
|
|
for_each_bank(i, mi) {
|
|
struct membank *bank = &mi->bank[i];
|
|
|
|
bank_start = bank_pfn_start(bank);
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
/*
|
|
* Take care not to free memmap entries that don't exist
|
|
* due to SPARSEMEM sections which aren't present.
|
|
*/
|
|
bank_start = min(bank_start,
|
|
ALIGN(prev_bank_end, PAGES_PER_SECTION));
|
|
#else
|
|
/*
|
|
* Align down here since the VM subsystem insists that the
|
|
* memmap entries are valid from the bank start aligned to
|
|
* MAX_ORDER_NR_PAGES.
|
|
*/
|
|
bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
|
|
#endif
|
|
/*
|
|
* If we had a previous bank, and there is a space
|
|
* between the current bank and the previous, free it.
|
|
*/
|
|
if (prev_bank_end && prev_bank_end < bank_start)
|
|
free_memmap(prev_bank_end, bank_start);
|
|
|
|
/*
|
|
* Align up here since the VM subsystem insists that the
|
|
* memmap entries are valid from the bank end aligned to
|
|
* MAX_ORDER_NR_PAGES.
|
|
*/
|
|
prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
|
|
free_memmap(prev_bank_end,
|
|
ALIGN(prev_bank_end, PAGES_PER_SECTION));
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
static inline void free_area_high(unsigned long pfn, unsigned long end)
|
|
{
|
|
for (; pfn < end; pfn++)
|
|
free_highmem_page(pfn_to_page(pfn));
|
|
}
|
|
#endif
|
|
|
|
static void __init free_highpages(void)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
unsigned long max_low = max_low_pfn;
|
|
struct memblock_region *mem, *res;
|
|
|
|
/* set highmem page free */
|
|
for_each_memblock(memory, mem) {
|
|
unsigned long start = memblock_region_memory_base_pfn(mem);
|
|
unsigned long end = memblock_region_memory_end_pfn(mem);
|
|
|
|
/* Ignore complete lowmem entries */
|
|
if (end <= max_low)
|
|
continue;
|
|
|
|
/* Truncate partial highmem entries */
|
|
if (start < max_low)
|
|
start = max_low;
|
|
|
|
/* Find and exclude any reserved regions */
|
|
for_each_memblock(reserved, res) {
|
|
unsigned long res_start, res_end;
|
|
|
|
res_start = memblock_region_reserved_base_pfn(res);
|
|
res_end = memblock_region_reserved_end_pfn(res);
|
|
|
|
if (res_end < start)
|
|
continue;
|
|
if (res_start < start)
|
|
res_start = start;
|
|
if (res_start > end)
|
|
res_start = end;
|
|
if (res_end > end)
|
|
res_end = end;
|
|
if (res_start != start)
|
|
free_area_high(start, res_start);
|
|
start = res_end;
|
|
if (start == end)
|
|
break;
|
|
}
|
|
|
|
/* And now free anything which remains */
|
|
if (start < end)
|
|
free_area_high(start, end);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* mem_init() marks the free areas in the mem_map and tells us how much
|
|
* memory is free. This is done after various parts of the system have
|
|
* claimed their memory after the kernel image.
|
|
*/
|
|
void __init mem_init(void)
|
|
{
|
|
#ifdef CONFIG_HAVE_TCM
|
|
/* These pointers are filled in on TCM detection */
|
|
extern u32 dtcm_end;
|
|
extern u32 itcm_end;
|
|
#endif
|
|
|
|
max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
|
|
|
|
/* this will put all unused low memory onto the freelists */
|
|
free_unused_memmap(&meminfo);
|
|
free_all_bootmem();
|
|
|
|
#ifdef CONFIG_SA1111
|
|
/* now that our DMA memory is actually so designated, we can free it */
|
|
free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
|
|
#endif
|
|
|
|
free_highpages();
|
|
|
|
mem_init_print_info(NULL);
|
|
|
|
#define MLK(b, t) b, t, ((t) - (b)) >> 10
|
|
#define MLM(b, t) b, t, ((t) - (b)) >> 20
|
|
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
|
|
|
|
printk(KERN_NOTICE "Virtual kernel memory layout:\n"
|
|
" vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#ifdef CONFIG_HAVE_TCM
|
|
" DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
" ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#endif
|
|
" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#ifdef CONFIG_HIGHMEM
|
|
" pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#endif
|
|
#ifdef CONFIG_MODULES
|
|
" modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#endif
|
|
" .text : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .init : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .data : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .bss : 0x%p" " - 0x%p" " (%4d kB)\n",
|
|
|
|
MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
|
|
(PAGE_SIZE)),
|
|
#ifdef CONFIG_HAVE_TCM
|
|
MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
|
|
MLK(ITCM_OFFSET, (unsigned long) itcm_end),
|
|
#endif
|
|
MLK(FIXADDR_START, FIXADDR_TOP),
|
|
MLM(VMALLOC_START, VMALLOC_END),
|
|
MLM(PAGE_OFFSET, (unsigned long)high_memory),
|
|
#ifdef CONFIG_HIGHMEM
|
|
MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
|
|
(PAGE_SIZE)),
|
|
#endif
|
|
#ifdef CONFIG_MODULES
|
|
MLM(MODULES_VADDR, MODULES_END),
|
|
#endif
|
|
|
|
MLK_ROUNDUP(_text, _etext),
|
|
MLK_ROUNDUP(__init_begin, __init_end),
|
|
MLK_ROUNDUP(_sdata, _edata),
|
|
MLK_ROUNDUP(__bss_start, __bss_stop));
|
|
|
|
#undef MLK
|
|
#undef MLM
|
|
#undef MLK_ROUNDUP
|
|
|
|
/*
|
|
* Check boundaries twice: Some fundamental inconsistencies can
|
|
* be detected at build time already.
|
|
*/
|
|
#ifdef CONFIG_MMU
|
|
BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
|
|
BUG_ON(TASK_SIZE > MODULES_VADDR);
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
|
|
BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
|
|
#endif
|
|
|
|
if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
|
|
extern int sysctl_overcommit_memory;
|
|
/*
|
|
* On a machine this small we won't get
|
|
* anywhere without overcommit, so turn
|
|
* it on by default.
|
|
*/
|
|
sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
|
|
}
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
#ifdef CONFIG_HAVE_TCM
|
|
extern char __tcm_start, __tcm_end;
|
|
|
|
poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
|
|
free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
|
|
#endif
|
|
|
|
poison_init_mem(__init_begin, __init_end - __init_begin);
|
|
if (!machine_is_integrator() && !machine_is_cintegrator())
|
|
free_initmem_default(-1);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
static int keep_initrd;
|
|
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (!keep_initrd) {
|
|
poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
|
|
free_reserved_area((void *)start, (void *)end, -1, "initrd");
|
|
}
|
|
}
|
|
|
|
static int __init keepinitrd_setup(char *__unused)
|
|
{
|
|
keep_initrd = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("keepinitrd", keepinitrd_setup);
|
|
#endif
|