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Ignore physical memory ranges that are smaller than 64 KB. Those don't

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contribute significantly to the usable memory, but possibly make the MTRR
setup impossible. Might improve #5550.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35825 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2010-03-12 16:59:26 +00:00
parent f795376ec6
commit 6daecfb154
1 changed files with 16 additions and 1 deletions
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17
src/system/boot/platform/bios_ia32/mmu.cpp
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@ -697,9 +697,24 @@ mmu_init(void)
}
}
// sort the range
// sort the ranges
sort_addr_range(gKernelArgs.physical_memory_range,
gKernelArgs.num_physical_memory_ranges);
// On some machines we get several ranges that contain only a few pages
// (or even only one) each, which causes us to run out of MTRRs later.
// So we remove all ranges smaller than 64 KB, hoping that this will
// leave us only with a few larger contiguous ranges (ideally one).
for (int32 i = gKernelArgs.num_physical_memory_ranges - 1; i >= 0;
i--) {
size_t size = gKernelArgs.physical_memory_range[i].size;
if (size < 64 * 1024) {
addr_t start = gKernelArgs.physical_memory_range[i].start;
remove_address_range(gKernelArgs.physical_memory_range,
&gKernelArgs.num_physical_memory_ranges,
MAX_PHYSICAL_MEMORY_RANGE, start, size);
}
}
} else {
// TODO: for now!
dprintf("No extended memory block - using 64 MB (fix me!)\n");