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kern: Implement QueryIoMapping logic for < 8.0.0

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This commit is contained in:
Michael Scire 2020-07-13 19:02:00 -07:00 committed by SciresM
parent ff022115ca
commit d9e9fbe3c2
1 changed files with 40 additions and 25 deletions
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19
libraries/libmesosphere/source/svc/kern_svc_address_translation.cpp
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@ -32,7 +32,7 @@ namespace ams::kern::svc {
/* Check whether the address is aligned. */
const bool aligned = util::IsAligned(phys_addr, PageSize);
if (aligned) {
auto QueryIoMappingFromPageTable = [&] ALWAYS_INLINE_LAMBDA (uint64_t phys_addr, size_t size) -> Result {
/* The size must be non-zero. */
R_UNLESS(size > 0, svc::ResultInvalidSize());
@ -44,8 +44,22 @@ namespace ams::kern::svc {
/* Use the size as the found size. */
found_size = size;
return ResultSuccess();
};
if (aligned) {
/* Query the input. */
R_TRY(QueryIoMappingFromPageTable(phys_addr, size));
} else {
if (kern::GetTargetFirmware() < TargetFirmware_8_0_0 && phys_addr >= PageSize) {
/* Query the aligned-down page. */
const size_t offset = phys_addr & (PageSize - 1);
R_TRY(QueryIoMappingFromPageTable(phys_addr - offset, size + offset));
/* Adjust the output address. */
found_address += offset;
} else {
/* TODO: Older kernel ABI compatibility. */
/* Newer kernel only allows unaligned addresses when they're special enum members. */
R_UNLESS(phys_addr < PageSize, svc::ResultNotFound());
@ -72,6 +86,7 @@ namespace ams::kern::svc {
R_TRY(pt.QueryStaticMapping(std::addressof(found_address), region->GetAddress(), region->GetSize()));
found_size = region->GetSize();
}
}
/* We succeeded. */
MESOSPHERE_ASSERT(found_address != Null<KProcessAddress>);