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kern: add SvcReadWriteRegister

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This commit is contained in:
Michael Scire 2020-07-14 01:53:32 -07:00 committed by SciresM
parent ef1763334b
commit 9f79710cb7
3 changed files with 98 additions and 10 deletions
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2
libraries/libmesosphere/include/mesosphere/board/nintendo/nx/kern_k_system_control.hpp
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@ -48,7 +48,7 @@ namespace ams::kern::board::nintendo::nx {
/* Privileged Access. */
static void ReadWriteRegisterPrivileged(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value);
static void ReadWriteRegister(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value);
static Result ReadWriteRegister(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value);
static ALWAYS_INLINE u32 ReadRegisterPrivileged(ams::svc::PhysicalAddress address) {
u32 v;

98
libraries/libmesosphere/source/board/nintendo/nx/kern_k_system_control.cpp
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@ -125,12 +125,95 @@ namespace ams::kern::board::nintendo::nx {
return GetConfigU64(which) != 0;
}
ALWAYS_INLINE bool CheckRegisterAllowedTable(const u8 *table, const size_t offset) {
return (table[(offset / sizeof(u32)) / BITSIZEOF(u8)] & (1u << ((offset / sizeof(u32)) % BITSIZEOF(u8)))) != 0;
}
/* TODO: Generate this from a list of register names (see similar logic in exosphere)? */
constexpr inline const u8 McKernelRegisterWhitelist[(PageSize / sizeof(u32)) / BITSIZEOF(u8)] = {
0x9F, 0x31, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0x73, 0x3E, 0x6F, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xE4, 0xFF, 0xFF, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
/* TODO: Generate this from a list of register names (see similar logic in exosphere)? */
constexpr inline const u8 McUserRegisterWhitelist[(PageSize / sizeof(u32)) / BITSIZEOF(u8)] = {
0x00, 0x00, 0x20, 0x00, 0xF0, 0xFF, 0xF7, 0x01,
0xCD, 0xFE, 0xC0, 0xFE, 0x00, 0x00, 0x00, 0x00,
0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6E,
0x30, 0x05, 0x06, 0xB0, 0x71, 0xC8, 0x43, 0x04,
0x80, 0xFF, 0x08, 0x80, 0x03, 0x38, 0x8E, 0x1F,
0xC8, 0xFF, 0xFF, 0x00, 0x0E, 0x00, 0x00, 0x00,
0xF0, 0x1F, 0x00, 0x30, 0xF0, 0x03, 0x03, 0x30,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x31, 0x00, 0x00, 0x00, 0x00,
0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x0C, 0x00, 0xFE, 0x0F,
0x01, 0x00, 0x80, 0x00, 0x00, 0x08, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
bool IsRegisterAccessibleToPrivileged(ams::svc::PhysicalAddress address) {
if (!KMemoryLayout::GetMemoryControllerRegion().Contains(address)) {
return false;
/* Find the region for the address. */
KMemoryRegionTree::const_iterator it = KMemoryLayout::FindContainingRegion(KPhysicalAddress(address));
if (AMS_LIKELY(it != KMemoryLayout::GetPhysicalMemoryRegionTree().end())) {
if (AMS_LIKELY(it->IsDerivedFrom(KMemoryRegionAttr_NoUserMap | KMemoryRegionType_MemoryController))) {
/* Get the offset within the region. */
const size_t offset = address - it->GetAddress();
MESOSPHERE_ABORT_UNLESS(offset < it->GetSize());
/* Check the whitelist. */
if (AMS_LIKELY(CheckRegisterAllowedTable(McKernelRegisterWhitelist, offset))) {
return true;
}
}
}
/* TODO: Validate specific offsets. */
return true;
return false;
}
bool IsRegisterAccessibleToUser(ams::svc::PhysicalAddress address) {
/* Find the region for the address. */
KMemoryRegionTree::const_iterator it = KMemoryLayout::FindContainingRegion(KPhysicalAddress(address));
if (AMS_LIKELY(it != KMemoryLayout::GetPhysicalMemoryRegionTree().end())) {
/* The PMC is always allowed. */
if (it->IsDerivedFrom(KMemoryRegionAttr_NoUserMap | KMemoryRegionType_PowerManagementController)) {
return true;
}
/* Memory controller is allowed if the register is whitelisted. */
if (it->IsDerivedFrom(KMemoryRegionAttr_NoUserMap | KMemoryRegionType_MemoryController ) ||
it->IsDerivedFrom(KMemoryRegionAttr_NoUserMap | KMemoryRegionType_MemoryController0) ||
it->IsDerivedFrom(KMemoryRegionAttr_NoUserMap | KMemoryRegionType_MemoryController1))
{
/* Get the offset within the region. */
const size_t offset = address - it->GetAddress();
MESOSPHERE_ABORT_UNLESS(offset < it->GetSize());
/* Check the whitelist. */
if (AMS_LIKELY(CheckRegisterAllowedTable(McUserRegisterWhitelist, offset))) {
return true;
}
}
}
return false;
}
}
@ -299,8 +382,11 @@ namespace ams::kern::board::nintendo::nx {
MESOSPHERE_ABORT_UNLESS(smc::ReadWriteRegister(out, address, mask, value));
}
void KSystemControl::ReadWriteRegister(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value) {
MESOSPHERE_UNIMPLEMENTED();
Result KSystemControl::ReadWriteRegister(u32 *out, ams::svc::PhysicalAddress address, u32 mask, u32 value) {
R_UNLESS(AMS_LIKELY(util::IsAligned(address, sizeof(u32))), svc::ResultInvalidAddress());
R_UNLESS(AMS_LIKELY(IsRegisterAccessibleToUser(address)), svc::ResultInvalidAddress());
R_UNLESS(AMS_LIKELY(smc::ReadWriteRegister(out, address, mask, value)), svc::ResultInvalidAddress());
return ResultSuccess();
}
/* Randomness. */

8
libraries/libmesosphere/source/svc/kern_svc_register.cpp
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@ -21,20 +21,22 @@ namespace ams::kern::svc {
namespace {
Result ReadWriteRegister(uint32_t *out, ams::svc::PhysicalAddress address, uint32_t mask, uint32_t value) {
return KSystemControl::ReadWriteRegister(out, address, mask, value);
}
}
/* ============================= 64 ABI ============================= */
Result ReadWriteRegister64(uint32_t *out_value, ams::svc::PhysicalAddress address, uint32_t mask, uint32_t value) {
MESOSPHERE_PANIC("Stubbed SvcReadWriteRegister64 was called.");
return ReadWriteRegister(out_value, address, mask, value);
}
/* ============================= 64From32 ABI ============================= */
Result ReadWriteRegister64From32(uint32_t *out_value, ams::svc::PhysicalAddress address, uint32_t mask, uint32_t value) {
MESOSPHERE_PANIC("Stubbed SvcReadWriteRegister64From32 was called.");
return ReadWriteRegister(out_value, address, mask, value);
}
}