linux/arch/hexagon/mm/init.c

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/*
* Memory subsystem initialization for Hexagon
*
* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <asm/atomic.h>
#include <linux/highmem.h>
#include <asm/tlb.h>
#include <asm/sections.h>
#include <asm/vm_mmu.h>
/*
* Define a startpg just past the end of the kernel image and a lastpg
* that corresponds to the end of real or simulated platform memory.
*/
#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
unsigned long bootmem_lastpg; /* Should be set by platform code */
unsigned long __phys_offset; /* physical kernel offset >> 12 */
/* Set as variable to limit PMD copies */
int max_kernel_seg = 0x303;
/* think this should be (page_size-1) the way it's used...*/
unsigned long zero_page_mask;
/* indicate pfn's of high memory */
unsigned long highstart_pfn, highend_pfn;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
/* Default cache attribute for newly created page tables */
unsigned long _dflt_cache_att = CACHEDEF;
/*
* The current "generation" of kernel map, which should not roll
* over until Hell freezes over. Actual bound in years needs to be
* calculated to confirm.
*/
DEFINE_SPINLOCK(kmap_gen_lock);
/* checkpatch says don't init this to 0. */
unsigned long long kmap_generation;
/*
* mem_init - initializes memory
*
* Frees up bootmem
* Fixes up more stuff for HIGHMEM
* Calculates and displays memory available/used
*/
void __init mem_init(void)
{
/* No idea where this is actually declared. Seems to evade LXR. */
mm: concentrate modification of totalram_pages into the mm core Concentrate code to modify totalram_pages into the mm core, so the arch memory initialized code doesn't need to take care of it. With these changes applied, only following functions from mm core modify global variable totalram_pages: free_bootmem_late(), free_all_bootmem(), free_all_bootmem_node(), adjust_managed_page_count(). With this patch applied, it will be much more easier for us to keep totalram_pages and zone->managed_pages in consistence. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: David Howells <dhowells@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: <sworddragon2@aol.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Michel Lespinasse <walken@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-04 06:03:24 +08:00
free_all_bootmem();
mem_init_print_info(NULL);
/*
* To-Do: someone somewhere should wipe out the bootmem map
* after we're done?
*/
/*
* This can be moved to some more virtual-memory-specific
* initialization hook at some point. Set the init_mm
* descriptors "context" value to point to the initial
* kernel segment table's physical address.
*/
init_mm.context.ptbase = __pa(init_mm.pgd);
}
/*
* free_initmem - frees memory used by stuff declared with __init
*
* Todo: free pages between __init_begin and __init_end; possibly
* some devtree related stuff as well.
*/
void __init_refok free_initmem(void)
{
}
/*
* free_initrd_mem - frees... initrd memory.
* @start - start of init memory
* @end - end of init memory
*
* Apparently has to be passed the address of the initrd memory.
*
* Wrapped by #ifdef CONFIG_BLKDEV_INITRD
*/
void free_initrd_mem(unsigned long start, unsigned long end)
{
}
void sync_icache_dcache(pte_t pte)
{
unsigned long addr;
struct page *page;
page = pte_page(pte);
addr = (unsigned long) page_address(page);
__vmcache_idsync(addr, PAGE_SIZE);
}
/*
* In order to set up page allocator "nodes",
* somebody has to call free_area_init() for UMA.
*
* In this mode, we only have one pg_data_t
* structure: contig_mem_data.
*/
void __init paging_init(void)
{
unsigned long zones_sizes[MAX_NR_ZONES] = {0, };
/*
* This is not particularly well documented anywhere, but
* give ZONE_NORMAL all the memory, including the big holes
* left by the kernel+bootmem_map which are already left as reserved
* in the bootmem_map; free_area_init should see those bits and
* adjust accordingly.
*/
zones_sizes[ZONE_NORMAL] = max_low_pfn;
free_area_init(zones_sizes); /* sets up the zonelists and mem_map */
/*
* Start of high memory area. Will probably need something more
* fancy if we... get more fancy.
*/
high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT);
}
#ifndef DMA_RESERVE
#define DMA_RESERVE (4)
#endif
#define DMA_CHUNKSIZE (1<<22)
#define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE)
/*
* Pick out the memory size. We look for mem=size,
* where size is "size[KkMm]"
*/
static int __init early_mem(char *p)
{
unsigned long size;
char *endp;
size = memparse(p, &endp);
bootmem_lastpg = PFN_DOWN(size);
return 0;
}
early_param("mem", early_mem);
size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22);
void __init setup_arch_memory(void)
{
int bootmap_size;
/* XXX Todo: this probably should be cleaned up */
u32 *segtable = (u32 *) &swapper_pg_dir[0];
u32 *segtable_end;
/*
* Set up boot memory allocator
*
* The Gorman book also talks about these functions.
* This needs to change for highmem setups.
*/
/* Prior to this, bootmem_lastpg is actually mem size */
bootmem_lastpg += ARCH_PFN_OFFSET;
/* Memory size needs to be a multiple of 16M */
bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
~((BIG_KERNEL_PAGE_SIZE) - 1));
/*
* Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
* memory allocation
*/
max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
min_low_pfn = ARCH_PFN_OFFSET;
bootmap_size = init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn);
printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
printk(KERN_INFO "bootmap_size: %d\n", bootmap_size);
printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn);
/*
* The default VM page tables (will be) populated with
* VA=PA+PAGE_OFFSET mapping. We go in and invalidate entries
* higher than what we have memory for.
*/
/* this is pointer arithmetic; each entry covers 4MB */
segtable = segtable + (PAGE_OFFSET >> 22);
/* this actually only goes to the end of the first gig */
segtable_end = segtable + (1<<(30-22));
/*
* Move forward to the start of empty pages; take into account
* phys_offset shift.
*/
segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
{
int i;
for (i = 1 ; i <= DMA_RESERVE ; i++)
segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
| __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X
| __HEXAGON_C_UNC << 6
| __HVM_PDE_S_4MB);
}
printk(KERN_INFO "clearing segtable from %p to %p\n", segtable,
segtable_end);
while (segtable < (segtable_end-8))
*(segtable++) = __HVM_PDE_S_INVALID;
/* stop the pointer at the device I/O 4MB page */
printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n",
segtable);
#if 0
/* Other half of the early device table from vm_init_segtable. */
printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n",
(unsigned long) _K_init_devicetable-PAGE_OFFSET);
*segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) |
__HVM_PDE_S_4KB;
printk(KERN_INFO "*segtable = 0x%08x\n", *segtable);
#endif
/*
* Free all the memory that wasn't taken up by the bootmap, the DMA
* reserve, or kernel itself.
*/
free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size,
PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size -
DMA_RESERVED_BYTES);
/*
* The bootmem allocator seemingly just lives to feed memory
* to the paging system
*/
printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE);
paging_init(); /* See Gorman Book, 2.3 */
/*
* At this point, the page allocator is kind of initialized, but
* apparently no pages are available (just like with the bootmem
* allocator), and need to be freed themselves via mem_init(),
* which is called by start_kernel() later on in the process
*/
}