Haiku/haiku
Haiku/haiku
1
0
Fork 0
mirror of https://review.haiku-os.org/haiku synced 2024-11-23 07:18:40 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

arm64: Port working MaxPagesNeededToMap from RISCV

Browse Source 
Change-Id: Ib532621656c57a34989879c43cc02a5bf81dc7bd
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8437
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
This commit is contained in:
Owen Anderson 2024-10-07 08:42:20 +00:00 committed by waddlesplash
parent 17c50417f8
commit 6519d02771
1 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/system/kernel/arch/arm64/VMSAv8TranslationMap.cpp
View File

@ -251,18 +251,29 @@ VMSAv8TranslationMap::MappedSize() const
size_t
VMSAv8TranslationMap::MaxPagesNeededToMap(addr_t start, addr_t end) const
{
size_t result = 0;
size_t size = end - start + 1;
constexpr uint64_t level3Range = B_PAGE_SIZE * 512;
constexpr uint64_t level2Range = level3Range * 512;
constexpr uint64_t level1Range = level2Range * 512;
constexpr uint64_t level0Range = level1Range * 512;
for (int i = fInitialLevel; i < 3; i++) {
int tableBits = fPageBits - 3;
int shift = tableBits * (3 - i) + fPageBits;
uint64_t entrySize = 1UL << shift;
result += size / entrySize + 2;
if (start == 0) {
start = level3Range - B_PAGE_SIZE;
end += start;
}
return result;
size_t requiredPages[] = {
end / level0Range + 1 - start / level0Range,
end / level1Range + 1 - start / level1Range,
end / level2Range + 1 - start / level2Range,
end / level3Range + 1 - start / level3Range
};
size_t ret = 0;
for (int i = fInitialLevel; i < 4; ++i) {
ret += requiredPages[i];
}
return ret;
}