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Fix stupid page allocator bitmap silliness

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This commit is contained in:
Eryn Wells 2016-04-14 02:36:26 -04:00
parent 58817e7ced
commit 99d29e48ac
1 changed files with 7 additions and 2 deletions
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9
src/memory/FrameAllocator.cc
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@ -52,17 +52,22 @@ FrameAllocator::allocate()
{
// Find the first bitmap with a free slot, and the first free slot, and return it.
const u32 pagesPerBitmap = Bitmap::length;
for (usize i = 0; i < mNumberOfPages; i += pagesPerBitmap) {
for (usize i = 0; i < mNumberOfPages; i++) {
auto bitmap = mBitmap[i];
if (!bitmap.isFull()) {
kstd::printFormat("Found partially full bitmap %ld -> %02X\n", i, u8(bitmap));
for (usize j = 0; j < pagesPerBitmap; j++) {
if (!bitmap.isSet(j)) {
bitmap.set(j);
return addressOfPage(i * pagesPerBitmap + j);
usize page = i * pagesPerBitmap + j;
void* pageAddress = addressOfPage(page);
kstd::printFormat("Allocating frame for page %ld at address 0x%08lX\n", page, u32(pageAddress));
return pageAddress;
}
}
}
}
kstd::printFormat("Couldn't allocate frame\n");
return nullptr;
}