diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-03-11 10:49:34 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-03-11 10:49:34 +0100 |
commit | d95c3578120e5bc4784069439f00ccb1b5f87717 (patch) | |
tree | c819de31de3983f3d69f223ede07667ff23bf7da /arch/x86/mm/pgtable.c | |
parent | ba1d755a36f66101aa88ac9ebb54694def6ec38d (diff) | |
parent | 78b020d035074fc3aa4d017353bb2c32e2aff56f (diff) |
Merge branch 'x86/core' into cpus4096
Diffstat (limited to 'arch/x86/mm/pgtable.c')
-rw-r--r-- | arch/x86/mm/pgtable.c | 18 |
1 files changed, 18 insertions, 0 deletions
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) |