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kern: SvcQueryPhysicalAddress

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Michael Scire 2020-07-30 17:26:09 -07:00 • committed by SciresM
parent 9bc2c0c0c5
commit 91fa0d651f
4 changed files with 107 additions and 2 deletions
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76
libraries/libmesosphere/source/kern_k_page_table_base.cpp
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@ -1492,6 +1492,82 @@ namespace ams::kern {
return this->QueryInfoImpl(out_info, out_page_info, addr);
}
Result KPageTableBase::QueryPhysicalAddress(ams::svc::PhysicalMemoryInfo *out, KProcessAddress address) const {
/* Lock the table. */
KScopedLightLock lk(this->general_lock);
/* Align the address down to page size. */
address = util::AlignDown(GetInteger(address), PageSize);
/* Verify that we can query the address. */
KMemoryInfo info;
ams::svc::PageInfo page_info;
R_TRY(this->QueryInfoImpl(std::addressof(info), std::addressof(page_info), address));
/* Check the memory state. */
R_TRY(this->CheckMemoryState(info, KMemoryState_FlagCanQueryPhysical, KMemoryState_FlagCanQueryPhysical, KMemoryPermission_UserReadExecute, KMemoryPermission_UserRead, KMemoryAttribute_None, KMemoryAttribute_None));
/* Prepare to traverse. */
KPhysicalAddress phys_addr;
size_t phys_size;
KProcessAddress virt_addr = info.GetAddress();
KProcessAddress end_addr = info.GetEndAddress();
/* Perform traversal. */
{
/* Begin traversal. */
TraversalContext context;
TraversalEntry next_entry;
bool traverse_valid = impl.BeginTraversal(std::addressof(next_entry), std::addressof(context), virt_addr);
R_UNLESS(traverse_valid, svc::ResultInvalidCurrentMemory());
/* Set tracking variables. */
phys_addr = next_entry.phys_addr;
phys_size = next_entry.block_size - (GetInteger(phys_addr) & (next_entry.block_size - 1));
/* Iterate. */
while (true) {
/* Continue the traversal. */
traverse_valid = impl.ContinueTraversal(std::addressof(next_entry), std::addressof(context));
if (!traverse_valid) {
break;
}
if (next_entry.phys_addr != (phys_addr + phys_size)) {
/* Check if we're done. */
if (virt_addr <= address && address <= virt_addr + phys_size - 1) {
break;
}
/* Advance. */
phys_addr = next_entry.phys_addr;
virt_addr += next_entry.block_size;
phys_size = next_entry.block_size - (GetInteger(phys_addr) & (next_entry.block_size - 1));
} else {
phys_size += next_entry.block_size;
}
/* Check if we're done. */
if (end_addr < virt_addr + phys_size) {
break;
}
}
MESOSPHERE_ASSERT(virt_addr <= address && address <= virt_addr + phys_size - 1);
/* Ensure we use the right size. */
if (end_addr < virt_addr + phys_size) {
phys_size = end_addr - virt_addr;
}
}
/* Set the output. */
out->physical_address = GetInteger(phys_addr);
out->virtual_address = GetInteger(virt_addr);
out->size = phys_size;
return ResultSuccess();
}
Result KPageTableBase::MapIo(KPhysicalAddress phys_addr, size_t size, KMemoryPermission perm) {
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(phys_addr), PageSize));
MESOSPHERE_ASSERT(util::IsAligned(size, PageSize));