2008-01-30 13:32:44 +01:00
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#ifndef _ASM_X86_PAGE_32_H
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#define _ASM_X86_PAGE_32_H
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/*
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* This handles the memory map.
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*
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* A __PAGE_OFFSET of 0xC0000000 means that the kernel has
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* a virtual address space of one gigabyte, which limits the
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* amount of physical memory you can use to about 950MB.
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*
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* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
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* and CONFIG_HIGHMEM64G options in the kernel configuration.
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*/
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#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
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2008-04-29 03:52:40 +02:00
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#ifdef CONFIG_4KSTACKS
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#define THREAD_ORDER 0
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#else
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#define THREAD_ORDER 1
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#endif
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#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
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2008-01-30 13:32:44 +01:00
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#ifdef CONFIG_X86_PAE
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2008-06-06 11:21:39 +02:00
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/* 44=32+12, the limit we can fit into an unsigned long pfn */
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#define __PHYSICAL_MASK_SHIFT 44
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2008-01-30 13:32:44 +01:00
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#define __VIRTUAL_MASK_SHIFT 32
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#define PAGETABLE_LEVELS 3
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2005-04-17 00:20:36 +02:00
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#ifndef __ASSEMBLY__
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2008-01-30 13:32:44 +01:00
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typedef u64 pteval_t;
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typedef u64 pmdval_t;
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typedef u64 pudval_t;
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typedef u64 pgdval_t;
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typedef u64 pgprotval_t;
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typedef u64 phys_addr_t;
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2005-04-17 00:20:36 +02:00
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2008-01-30 13:32:57 +01:00
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typedef union {
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struct {
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unsigned long pte_low, pte_high;
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};
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pteval_t pte;
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} pte_t;
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2008-01-30 13:32:44 +01:00
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#endif /* __ASSEMBLY__
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2005-04-17 00:20:36 +02:00
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*/
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2008-01-30 13:32:44 +01:00
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#else /* !CONFIG_X86_PAE */
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#define __PHYSICAL_MASK_SHIFT 32
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#define __VIRTUAL_MASK_SHIFT 32
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#define PAGETABLE_LEVELS 2
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#ifndef __ASSEMBLY__
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typedef unsigned long pteval_t;
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typedef unsigned long pmdval_t;
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typedef unsigned long pudval_t;
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typedef unsigned long pgdval_t;
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typedef unsigned long pgprotval_t;
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typedef unsigned long phys_addr_t;
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2007-05-02 19:27:13 +02:00
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2008-03-23 09:02:57 +01:00
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typedef union {
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pteval_t pte;
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pteval_t pte_low;
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} pte_t;
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2008-01-30 13:32:44 +01:00
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_X86_PAE */
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2008-02-09 00:15:06 +01:00
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#ifndef __ASSEMBLY__
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typedef struct page *pgtable_t;
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#endif
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2008-01-30 13:32:44 +01:00
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#ifdef CONFIG_HUGETLB_PAGE
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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2005-04-17 00:20:36 +02:00
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#ifndef __ASSEMBLY__
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2008-03-23 09:02:57 +01:00
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#define __phys_addr(x) ((x) - PAGE_OFFSET)
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2008-01-30 13:32:44 +01:00
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#define __phys_reloc_hide(x) RELOC_HIDE((x), 0)
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#endif /* CONFIG_FLATMEM */
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extern int nx_enabled;
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/*
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* This much address space is reserved for vmalloc() and iomap()
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* as well as fixmap mappings.
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*/
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extern unsigned int __VMALLOC_RESERVE;
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extern int sysctl_legacy_va_layout;
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#define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
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2008-03-23 09:02:57 +01:00
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#define MAXMEM (-__PAGE_OFFSET - __VMALLOC_RESERVE)
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2005-04-17 00:20:36 +02:00
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2008-06-23 12:05:30 +02:00
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extern void find_low_pfn_range(void);
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2008-06-24 21:18:14 +02:00
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extern unsigned long init_memory_mapping(unsigned long start,
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unsigned long end);
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2008-06-23 12:05:30 +02:00
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extern void initmem_init(unsigned long, unsigned long);
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2008-06-22 11:45:39 +02:00
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extern void setup_bootmem_allocator(void);
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2008-01-30 13:32:44 +01:00
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#ifdef CONFIG_X86_USE_3DNOW
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#include <asm/mmx.h>
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[PATCH] vdso: randomize the i386 vDSO by moving it into a vma
Move the i386 VDSO down into a vma and thus randomize it.
Besides the security implications, this feature also helps debuggers, which
can COW a vma-backed VDSO just like a normal DSO and can thus do
single-stepping and other debugging features.
It's good for hypervisors (Xen, VMWare) too, which typically live in the same
high-mapped address space as the VDSO, hence whenever the VDSO is used, they
get lots of guest pagefaults and have to fix such guest accesses up - which
slows things down instead of speeding things up (the primary purpose of the
VDSO).
There's a new CONFIG_COMPAT_VDSO (default=y) option, which provides support
for older glibcs that still rely on a prelinked high-mapped VDSO. Newer
distributions (using glibc 2.3.3 or later) can turn this option off. Turning
it off is also recommended for security reasons: attackers cannot use the
predictable high-mapped VDSO page as syscall trampoline anymore.
There is a new vdso=[0|1] boot option as well, and a runtime
/proc/sys/vm/vdso_enabled sysctl switch, that allows the VDSO to be turned
on/off.
(This version of the VDSO-randomization patch also has working ELF
coredumping, the previous patch crashed in the coredumping code.)
This code is a combined work of the exec-shield VDSO randomization
code and Gerd Hoffmann's hypervisor-centric VDSO patch. Rusty Russell
started this patch and i completed it.
[akpm@osdl.org: cleanups]
[akpm@osdl.org: compile fix]
[akpm@osdl.org: compile fix 2]
[akpm@osdl.org: compile fix 3]
[akpm@osdl.org: revernt MAXMEM change]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Cc: Gerd Hoffmann <kraxel@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-27 11:53:50 +02:00
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2008-01-30 13:32:44 +01:00
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static inline void clear_page(void *page)
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{
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mmx_clear_page(page);
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}
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2005-04-17 00:20:36 +02:00
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2008-01-30 13:32:44 +01:00
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static inline void copy_page(void *to, void *from)
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{
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mmx_copy_page(to, from);
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}
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#else /* !CONFIG_X86_USE_3DNOW */
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#include <linux/string.h>
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2005-04-17 00:20:36 +02:00
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2008-01-30 13:32:44 +01:00
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static inline void clear_page(void *page)
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{
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memset(page, 0, PAGE_SIZE);
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}
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2005-09-04 00:54:30 +02:00
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2008-01-30 13:32:44 +01:00
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static inline void copy_page(void *to, void *from)
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{
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memcpy(to, from, PAGE_SIZE);
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}
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#endif /* CONFIG_X86_3DNOW */
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#endif /* !__ASSEMBLY__ */
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2006-04-27 16:48:08 +02:00
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2008-01-30 13:32:44 +01:00
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#endif /* _ASM_X86_PAGE_32_H */
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