OmniNX/Atmosphere
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files

68
libraries/libmesosphere/source/svc/kern_svc_address_translation.cpp
View File

@@ -21,7 +21,69 @@ namespace ams::kern::svc {
namespace {
Result QueryIoMapping(uintptr_t *out_address, size_t *out_size, uint64_t phys_addr, size_t size) {
/* Declare variables we'll populate. */
KProcessAddress found_address = Null<KProcessAddress>;
size_t found_size = 0;
/* Get reference to page table. */
auto &pt = GetCurrentProcess().GetPageTable();
/* Check whether the address is aligned. */
const bool aligned = util::IsAligned(phys_addr, PageSize);
if (aligned) {
/* The size must be non-zero. */
R_UNLESS(size > 0, svc::ResultInvalidSize());
/* The request must not overflow. */
R_UNLESS((phys_addr < phys_addr + size), svc::ResultNotFound());
/* Query the mapping. */
R_TRY(pt.QueryIoMapping(std::addressof(found_address), phys_addr, size));
/* Use the size as the found size. */
found_size = size;
} 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());
/* Try to find the memory region. */
const KMemoryRegion *region;
switch (static_cast<ams::svc::MemoryRegionType>(phys_addr)) {
case ams::svc::MemoryRegionType_KernelTraceBuffer:
region = KMemoryLayout::TryGetKernelTraceBufferRegion();
break;
case ams::svc::MemoryRegionType_OnMemoryBootImage:
region = KMemoryLayout::TryGetOnMemoryBootImageRegion();
break;
case ams::svc::MemoryRegionType_DTB:
region = KMemoryLayout::TryGetDTBRegion();
break;
default:
region = nullptr;
break;
}
/* Ensure that we found the region. */
R_UNLESS(region != nullptr, svc::ResultNotFound());
R_TRY(pt.QueryStaticMapping(std::addressof(found_address), region->GetAddress(), region->GetSize()));
found_size = region->GetSize();
}
/* We succeeded. */
MESOSPHERE_ASSERT(found_address != Null<KProcessAddress>);
MESOSPHERE_ASSERT(found_size != 0);
if (out_address != nullptr) {
*out_address = GetInteger(found_address);
}
if (out_size != nullptr) {
*out_size = found_size;
}
return ResultSuccess();
}
}
@@ -32,7 +94,8 @@ namespace ams::kern::svc {
}
Result QueryIoMapping64(ams::svc::Address *out_address, ams::svc::PhysicalAddress physical_address, ams::svc::Size size) {
MESOSPHERE_PANIC("Stubbed SvcQueryIoMapping64 was called.");
static_assert(sizeof(*out_address) == sizeof(uintptr_t));
return QueryIoMapping(reinterpret_cast<uintptr_t *>(out_address), nullptr, physical_address, size);
}
/* ============================= 64From32 ABI ============================= */
@@ -42,7 +105,8 @@ namespace ams::kern::svc {
}
Result QueryIoMapping64From32(ams::svc::Address *out_address, ams::svc::PhysicalAddress physical_address, ams::svc::Size size) {
MESOSPHERE_PANIC("Stubbed SvcQueryIoMapping64From32 was called.");
static_assert(sizeof(*out_address) == sizeof(uintptr_t));
return QueryIoMapping(reinterpret_cast<uintptr_t *>(out_address), nullptr, physical_address, size);
}
}