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kern: add SvcQueryIoMapping (NOTE: pre-10.x, ABI needs update)

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This commit is contained in:
Michael Scire 2020-07-13 13:24:32 -07:00
parent 57867d6ced
commit 18698bf1d3
6 changed files with 204 additions and 2 deletions
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70
libraries/libmesosphere/source/kern_k_page_table_base.cpp
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@ -585,6 +585,76 @@ namespace ams::kern {
return ResultSuccess();
}
Result KPageTableBase::QueryMappingImpl(KProcessAddress *out, KPhysicalAddress address, size_t size, KMemoryState state) const {
MESOSPHERE_ASSERT(!this->IsLockedByCurrentThread());
MESOSPHERE_ASSERT(out != nullptr);
const KProcessAddress region_start = this->GetRegionAddress(state);
const size_t region_size = this->GetRegionSize(state);
/* Check that the address/size are potentially valid. */
R_UNLESS((address < address + size), svc::ResultNotFound());
/* Lock the table. */
KScopedLightLock lk(this->general_lock);
auto &impl = this->GetImpl();
/* Begin traversal. */
TraversalContext context;
TraversalEntry cur_entry = {};
bool cur_valid = false;
TraversalEntry next_entry;
bool next_valid;
size_t tot_size = false;
next_valid = impl.BeginTraversal(std::addressof(next_entry), std::addressof(context), region_start);
next_entry.block_size = (next_entry.block_size - (GetInteger(address) & (next_entry.block_size - 1)));
/* Iterate, looking for entry. */
while (true) {
if ((!next_valid && !cur_valid) || (next_valid && cur_valid && next_entry.phys_addr == cur_entry.phys_addr + cur_entry.block_size)) {
cur_entry.block_size += next_entry.block_size;
} else {
if (cur_valid && cur_entry.phys_addr <= address && address + size <= cur_entry.phys_addr + cur_entry.block_size) {
/* Check if this region is valid. */
const KProcessAddress mapped_address = (region_start + tot_size) + (address - cur_entry.phys_addr);
if (R_SUCCEEDED(this->CheckMemoryState(mapped_address, size, KMemoryState_All, state, KMemoryPermission_UserRead, KMemoryPermission_UserRead, KMemoryAttribute_None, KMemoryAttribute_None))) {
/* It is! */
*out = mapped_address;
return ResultSuccess();
}
}
/* Update tracking variables. */
tot_size += cur_entry.block_size;
cur_entry = next_entry;
cur_valid = next_valid;
}
if (cur_entry.block_size + tot_size >= region_size) {
break;
}
next_valid = impl.ContinueTraversal(std::addressof(next_entry), std::addressof(context));
}
/* Check the last entry. */
R_UNLESS(cur_valid, svc::ResultNotFound());
R_UNLESS(cur_entry.phys_addr <= address, svc::ResultNotFound());
R_UNLESS(address + size <= cur_entry.phys_addr + cur_entry.block_size, svc::ResultNotFound());
/* Check if the last region is valid. */
const KProcessAddress mapped_address = (region_start + tot_size) + (address - cur_entry.phys_addr);
R_TRY_CATCH(this->CheckMemoryState(mapped_address, size, KMemoryState_All, state, KMemoryPermission_UserRead, KMemoryPermission_UserRead, KMemoryAttribute_None, KMemoryAttribute_None)) {
R_CONVERT_ALL(svc::ResultNotFound());
} R_END_TRY_CATCH;
/* We found the region. */
*out = mapped_address;
return ResultSuccess();
}
Result KPageTableBase::MapMemory(KProcessAddress dst_address, KProcessAddress src_address, size_t size) {
/* Lock the table. */
KScopedLightLock lk(this->general_lock);