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| author | Gustavo F. Padovan <gustavo@las.ic.unicamp.br> | 2009-02-16 03:48:54 +0300 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-02-28 07:57:47 +0300 |
| commit | fd862dde18c3e360f510780e1d1bf615866b11c2 (patch) | |
| tree | d67317c975ec7ed65c517a84243f0c5f877ae910 | |
| parent | ab93e3c45dbac66c2e8e24fd560c052a3907903e (diff) | |
| download | linux-fd862dde18c3e360f510780e1d1bf615866b11c2.tar.xz | |
x86, fixmap: define reserve_top_address for x86_64
Impact: new interface (not yet use)
Define reserve_top_address for x86_64; only for later x86 integration.
Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Acked-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | arch/x86/include/asm/fixmap_64.h | 2 | ||||
| -rw-r--r-- | arch/x86/mm/pgtable.c | 18 | ||||
| -rw-r--r-- | arch/x86/mm/pgtable_32.c | 16 |
3 files changed, 20 insertions, 16 deletions
diff --git a/arch/x86/include/asm/fixmap_64.h b/arch/x86/include/asm/fixmap_64.h index d905de086753..b6c06dd55f1c 100644 --- a/arch/x86/include/asm/fixmap_64.h +++ b/arch/x86/include/asm/fixmap_64.h @@ -68,6 +68,8 @@ enum fixed_addresses { __end_of_fixed_addresses }; +extern void reserve_top_address(unsigned long reserve); + #define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE) #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index 86f2ffc43c3d..5b7c7c8464fe 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -313,6 +313,24 @@ int ptep_clear_flush_young(struct vm_area_struct *vma, return young; } +/** + * reserve_top_address - reserves a hole in the top of kernel address space + * @reserve - size of hole to reserve + * + * Can be used to relocate the fixmap area and poke a hole in the top + * of kernel address space to make room for a hypervisor. + */ +void __init reserve_top_address(unsigned long reserve) +{ +#ifdef CONFIG_X86_32 + BUG_ON(fixmaps_set > 0); + printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", + (int)-reserve); + __FIXADDR_TOP = -reserve - PAGE_SIZE; + __VMALLOC_RESERVE += reserve; +#endif +} + int fixmaps_set; void __native_set_fixmap(enum fixed_addresses idx, pte_t pte) diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c index 0951db9ee519..c3cf6e115768 100644 --- a/arch/x86/mm/pgtable_32.c +++ b/arch/x86/mm/pgtable_32.c @@ -97,22 +97,6 @@ void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) unsigned long __FIXADDR_TOP = 0xfffff000; EXPORT_SYMBOL(__FIXADDR_TOP); -/** - * reserve_top_address - reserves a hole in the top of kernel address space - * @reserve - size of hole to reserve - * - * Can be used to relocate the fixmap area and poke a hole in the top - * of kernel address space to make room for a hypervisor. - */ -void __init reserve_top_address(unsigned long reserve) -{ - BUG_ON(fixmaps_set > 0); - printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", - (int)-reserve); - __FIXADDR_TOP = -reserve - PAGE_SIZE; - __VMALLOC_RESERVE += reserve; -} - /* * vmalloc=size forces the vmalloc area to be exactly 'size' * bytes. This can be used to increase (or decrease) the |