2005-04-16 22:20:36 +00:00
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/*
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* structures and definitions for the int 15, ax=e820 memory map
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* scheme.
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*
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* In a nutshell, setup.S populates a scratch table in the
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* empty_zero_block that contains a list of usable address/size
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* duples. setup.c, this information is transferred into the e820map,
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* and in init.c/numa.c, that new information is used to mark pages
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* reserved or not.
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*/
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#ifndef __E820_HEADER
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#define __E820_HEADER
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2008-01-30 12:30:32 +00:00
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#include <linux/ioport.h>
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2005-04-16 22:20:36 +00:00
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#ifndef __ASSEMBLY__
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extern unsigned long find_e820_area(unsigned long start, unsigned long end,
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2008-02-01 16:49:41 +00:00
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unsigned size, unsigned long align);
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2005-04-16 22:20:36 +00:00
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extern void add_memory_region(unsigned long start, unsigned long size,
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int type);
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2008-03-18 23:44:19 +00:00
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extern void update_memory_range(u64 start, u64 size, unsigned old_type,
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unsigned new_type);
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2005-04-16 22:20:36 +00:00
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extern void setup_memory_region(void);
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extern void contig_e820_setup(void);
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extern unsigned long e820_end_of_ram(void);
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2008-01-30 12:30:32 +00:00
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extern void e820_reserve_resources(struct resource *code_resource,
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struct resource *data_resource, struct resource *bss_resource);
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2006-09-26 06:32:46 +00:00
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extern void e820_mark_nosave_regions(void);
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2006-04-07 17:49:24 +00:00
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extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type);
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2006-04-07 17:49:27 +00:00
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extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type);
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2008-01-30 12:33:08 +00:00
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extern int e820_any_non_reserved(unsigned long start, unsigned long end);
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extern int is_memory_any_valid(unsigned long start, unsigned long end);
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extern int e820_all_non_reserved(unsigned long start, unsigned long end);
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extern int is_memory_all_valid(unsigned long start, unsigned long end);
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2007-02-13 12:26:22 +00:00
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extern unsigned long e820_hole_size(unsigned long start, unsigned long end);
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2005-04-16 22:20:36 +00:00
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2005-04-16 22:25:12 +00:00
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extern void e820_setup_gap(void);
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2006-09-27 08:49:52 +00:00
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extern void e820_register_active_regions(int nid,
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unsigned long start_pfn, unsigned long end_pfn);
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2005-04-16 22:20:36 +00:00
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2006-09-26 08:52:32 +00:00
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extern void finish_e820_parsing(void);
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2005-04-16 22:20:36 +00:00
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extern struct e820map e820;
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x86: disable the GART early, 64-bit
For K8 system: 4G RAM with memory hole remapping enabled, or more than
4G RAM installed.
when try to use kexec second kernel, and the first doesn't include
gart_shutdown. the second kernel could have different aper position than
the first kernel. and second kernel could use that hole as RAM that is
still used by GART set by the first kernel. esp. when try to kexec
2.6.24 with sparse mem enable from previous kernel (from RHEL 5 or SLES
10). the new kernel will use aper by GART (set by first kernel) for
vmemmap. and after new kernel setting one new GART. the position will be
real RAM. the _mapcount set is lost.
Bad page state in process 'swapper'
page:ffffe2000e600020 flags:0x0000000000000000 mapping:0000000000000000 mapcount:1 count:0
Trying to fix it up, but a reboot is needed
Backtrace:
Pid: 0, comm: swapper Not tainted 2.6.24-rc7-smp-gcdf71a10-dirty #13
Call Trace:
[<ffffffff8026401f>] bad_page+0x63/0x8d
[<ffffffff80264169>] __free_pages_ok+0x7c/0x2a5
[<ffffffff80ba75d1>] free_all_bootmem_core+0xd0/0x198
[<ffffffff80ba3a42>] numa_free_all_bootmem+0x3b/0x76
[<ffffffff80ba3461>] mem_init+0x3b/0x152
[<ffffffff80b959d3>] start_kernel+0x236/0x2c2
[<ffffffff80b9511a>] _sinittext+0x11a/0x121
and
[ffffe2000e600000-ffffe2000e7fffff] PMD ->ffff81001c200000 on node 0
phys addr is : 0x1c200000
RHEL 5.1 kernel -53 said:
PCI-DMA: aperture base @ 1c000000 size 65536 KB
new kernel said:
Mapping aperture over 65536 KB of RAM @ 3c000000
So could try to disable that GART if possible.
According to Ingo
> hm, i'm wondering, instead of modifying the GART, why dont we simply
> _detect_ whatever GART settings we have inherited, and propagate that
> into our e820 maps? I.e. if there's inconsistency, then punch that out
> from the memory maps and just dont use that memory.
>
> that way it would not matter whether the GART settings came from a [old
> or crashing] Linux kernel that has not called gart_iommu_shutdown(), or
> whether it's a BIOS that has set up an aperture hole inconsistent with
> the memory map it passed. (or the memory map we _think_ i tried to pass
> us)
>
> it would also be more robust to only read and do a memory map quirk
> based on that, than actively trying to change the GART so early in the
> bootup. Later on we have to re-enable the GART _anyway_ and have to
> punch a hole for it.
>
> and as a bonus, we would have shored up our defenses against crappy
> BIOSes as well.
add e820 modification for gart inconsistent setting.
gart_fix_e820=off could be used to disable e820 fix.
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 12:33:09 +00:00
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extern void update_e820(void);
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2006-05-08 13:17:28 +00:00
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2008-02-01 16:49:41 +00:00
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extern void reserve_early(unsigned long start, unsigned long end, char *name);
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2008-01-30 12:33:17 +00:00
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extern void early_res_to_bootmem(void);
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2008-01-30 12:33:08 +00:00
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2005-04-16 22:20:36 +00:00
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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/
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