diff options
| author | Jan Beulich <jbeulich@novell.com> | 2007-05-02 19:27:11 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:11 +0200 |
| commit | b92e9fac400d4ae5bc7a75c568e9844ec53ea329 (patch) | |
| tree | 2e5d5194d2532a4d8d4849802e19adcc617013f6 /arch/i386/kernel/e820.c | |
| parent | b00742d399513a4100c24cc2accefdc1bb1e0b15 (diff) | |
[PATCH] x86: fix amd64-agp aperture validation
Under CONFIG_DISCONTIGMEM, assuming that a !pfn_valid() implies all
subsequent pfn-s are also invalid is wrong. Thus replace this by
explicitly checking against the E820 map.
AK: make e820 on x86-64 not initdata
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Mark Langsdorf <mark.langsdorf@amd.com>
Diffstat (limited to 'arch/i386/kernel/e820.c')
| -rw-r--r-- | arch/i386/kernel/e820.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c index 31f4670ef74..829beec9247 100644 --- a/arch/i386/kernel/e820.c +++ b/arch/i386/kernel/e820.c @@ -825,6 +825,26 @@ void __init limit_regions(unsigned long long size) print_memory_map("limit_regions endfunc"); } +/* + * This function checks if any part of the range <start,end> is mapped + * with type. + */ +int +e820_any_mapped(u64 start, u64 end, unsigned type) +{ + int i; + for (i = 0; i < e820.nr_map; i++) { + const struct e820entry *ei = &e820.map[i]; + if (type && ei->type != type) + continue; + if (ei->addr >= end || ei->addr + ei->size <= start) + continue; + return 1; + } + return 0; +} +EXPORT_SYMBOL_GPL(e820_any_mapped); + /* * This function checks if the entire range <start,end> is mapped with type. * |