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| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-06-01 13:17:38 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-03 13:26:27 +0200 |
| commit | 2944e16b25e7fb8b5ee0dd9dc7197a0f9e523cfd (patch) | |
| tree | 0114128fdb9d2f54188a1684758e0217eadae1e5 /arch/x86/kernel/e820.c | |
| parent | e8c27ac9191ab9e6506ae5cbe70d87ac50f8e960 (diff) | |
| download | lwn-2944e16b25e7fb8b5ee0dd9dc7197a0f9e523cfd.tar.gz lwn-2944e16b25e7fb8b5ee0dd9dc7197a0f9e523cfd.zip | |
x86: update mptable
make mptable to be consistent with acpi routing, so we could:
1. kexec kernel with acpi=off
2. work around BIOSes where acpi routing is working, but mptable is
not right, so can use kernel/kexec to start other OSes that don't have
good acpi support.
command line: update_mptable
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/e820.c')
| -rw-r--r-- | arch/x86/kernel/e820.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 0cd9132c9450..cd2b99e27d43 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -739,3 +739,28 @@ u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align) return -1UL; } + +/* + * pre allocated 4k and reserved it in e820 + */ +u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align) +{ + u64 size = 0; + u64 addr; + u64 start; + + start = startt; + while (size < sizet) + start = find_e820_area_size(start, &size, align); + + if (size < sizet) + return 0; + + addr = round_down(start + size - sizet, align); + update_memory_range(addr, sizet, E820_RAM, E820_RESERVED); + printk(KERN_INFO "update e820 for early_reserve_e820\n"); + update_e820(); + + return addr; +} + |