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Add partial unmap support (#322)

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* Add partial unmap support

* undo accidental whitespace removal

* Fix assertions

* Adjust Reserve and Free functions for partial unmapping
This commit is contained in:
Borchev 2024-08-12 23:05:30 -07:00 • committed by GitHub
parent a8b6a55559
commit 18f1799280
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4 changed files with 47 additions and 20 deletions
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24
src/core/address_space.cpp
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@ -454,8 +454,28 @@ void* AddressSpace::MapFile(VAddr virtual_addr, size_t size, size_t offset, u32
#endif
}
void AddressSpace::Unmap(VAddr virtual_addr, size_t size, bool has_backing) {
return impl->Unmap(virtual_addr, size, has_backing);
void AddressSpace::Unmap(VAddr virtual_addr, size_t size, VAddr start_in_vma, VAddr end_in_vma,
PAddr phys_base, bool is_exec, bool has_backing) {
#ifdef _WIN32
// There does not appear to be comparable support for partial unmapping on Windows.
// Unfortunately, a least one title was found to require this. The workaround is to unmap
// the entire allocation and remap the portions outside of the requested unmapping range.
impl->Unmap(virtual_addr, size, has_backing);
// TODO: Determine if any titles require partial unmapping support for flexible allocations.
ASSERT_MSG(has_backing || (start_in_vma == 0 && end_in_vma == size),
"Partial unmapping of flexible allocations is not supported");
if (start_in_vma != 0) {
Map(virtual_addr, start_in_vma, 0, phys_base, is_exec);
}
if (end_in_vma != size) {
Map(virtual_addr + end_in_vma, size - end_in_vma, 0, phys_base + end_in_vma, is_exec);
}
#else
impl->Unmap(virtual_addr + start_in_vma, end_in_vma - start_in_vma, has_backing);
#endif
}
void AddressSpace::Protect(VAddr virtual_addr, size_t size, MemoryPermission perms) {