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kernel_ldr: finish implementing all core logic.

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Michael Scire 2019-12-17 00:37:55 -08:00 committed by SciresM
parent 623b5f4eb9
commit 8efdd04fcd
20 changed files with 854 additions and 81 deletions
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5
libraries/config/arch/arm64/cpu/cortex_a57/cpu.mk Normal file
View file

@ -0,0 +1,5 @@
export ATMOSPHERE_DEFINES += -DATMOSPHERE_CPU_ARM_CORTEX_A57
export ATMOSPHERE_SETTINGS += -mtune=cortex-a57
export ATMOSPHERE_CFLAGS +=
export ATMOSPHERE_CXXFLAGS +=
export ATMOSPHERE_ASFLAGS +=

2
libraries/config/board/nintendo/switch/board.mk
View file

@ -1,5 +1,5 @@
export ATMOSPHERE_DEFINES += -DATMOSPHERE_BOARD_NINTENDO_SWITCH -D__SWITCH__ export ATMOSPHERE_DEFINES += -DATMOSPHERE_BOARD_NINTENDO_SWITCH -D__SWITCH__
export ATMOSPHERE_SETTINGS += -mtune=cortex-a57 export ATMOSPHERE_SETTINGS +=
export ATMOSPHERE_CFLAGS += export ATMOSPHERE_CFLAGS +=
export ATMOSPHERE_CXXFLAGS += export ATMOSPHERE_CXXFLAGS +=
export ATMOSPHERE_ASFLAGS += export ATMOSPHERE_ASFLAGS +=

11
libraries/config/common.mk
View file

@ -9,6 +9,10 @@ ifeq ($(strip $(ATMOSPHERE_BOARD)),)
export ATMOSPHERE_BOARD := nx-hac-001 export ATMOSPHERE_BOARD := nx-hac-001
endif endif
ifeq ($(strip $(ATMOSPHERE_CPU)),)
export ATMOSPHERE_CPU := arm-cortex-a57
endif
export ATMOSPHERE_DEFINES := -DATMOSPHERE export ATMOSPHERE_DEFINES := -DATMOSPHERE
export ATMOSPHERE_SETTINGS := -fPIE -g export ATMOSPHERE_SETTINGS := -fPIE -g
export ATMOSPHERE_CFLAGS := -Wall -ffunction-sections -fdata-sections -fno-strict-aliasing -fwrapv \ export ATMOSPHERE_CFLAGS := -Wall -ffunction-sections -fdata-sections -fno-strict-aliasing -fwrapv \
@ -27,14 +31,21 @@ export ATMOSPHERE_BOARD_NAME := nintendo_switch
export ATMOSPHERE_OS_NAME := horizon export ATMOSPHERE_OS_NAME := horizon
endif endif
ifeq ($(ATMOSPHERE_CPU),arm-cortex-a57)
export ATMOSPHERE_CPU_DIR := arch/arm64/cpu/cortex_a57
export ATMOSPHERE_CPU_NAME := arm_cortex_a57
endif
export ATMOSPHERE_ARCH_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_ARCH_DIR) export ATMOSPHERE_ARCH_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_ARCH_DIR)
export ATMOSPHERE_BOARD_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_BOARD_DIR) export ATMOSPHERE_BOARD_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_BOARD_DIR)
export ATMOSPHERE_OS_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_OS_DIR) export ATMOSPHERE_OS_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_OS_DIR)
export ATMOSPHERE_CPU_MAKE_DIR := $(ATMOSPHERE_CONFIG_MAKE_DIR)/$(ATMOSPHERE_CPU_DIR)
include $(ATMOSPHERE_ARCH_MAKE_DIR)/arch.mk include $(ATMOSPHERE_ARCH_MAKE_DIR)/arch.mk
include $(ATMOSPHERE_BOARD_MAKE_DIR)/board.mk include $(ATMOSPHERE_BOARD_MAKE_DIR)/board.mk
include $(ATMOSPHERE_OS_MAKE_DIR)/os.mk include $(ATMOSPHERE_OS_MAKE_DIR)/os.mk
include $(ATMOSPHERE_CPU_MAKE_DIR)/cpu.mk
#--------------------------------------------------------------------------------- #---------------------------------------------------------------------------------
# get atmosphere git revision information # get atmosphere git revision information

3
libraries/libmesosphere/include/mesosphere.hpp
View file

@ -25,6 +25,9 @@
#include "mesosphere/kern_k_typed_address.hpp" #include "mesosphere/kern_k_typed_address.hpp"
#include "mesosphere/kern_initial_process.hpp" #include "mesosphere/kern_initial_process.hpp"
/* Core pre-initialization includes. */
#include "mesosphere/kern_select_cpu.hpp"
/* Initialization headers. */ /* Initialization headers. */
#include "mesosphere/init/kern_init_elf.hpp" #include "mesosphere/init/kern_init_elf.hpp"
#include "mesosphere/init/kern_init_layout.hpp" #include "mesosphere/init/kern_init_layout.hpp"

250
libraries/libmesosphere/include/mesosphere/arch/arm64/init/kern_k_init_page_table.hpp
View file

@ -17,7 +17,7 @@
#include <vapours.hpp> #include <vapours.hpp>
#include <mesosphere/kern_panic.hpp> #include <mesosphere/kern_panic.hpp>
#include <mesosphere/kern_k_typed_address.hpp> #include <mesosphere/kern_k_typed_address.hpp>
#include "../kern_hardware_registers.hpp" #include "../kern_cpu.hpp"
namespace ams::kern::init { namespace ams::kern::init {
@ -93,10 +93,17 @@ namespace ams::kern::init {
constexpr ALWAYS_INLINE bool IsNonSecure() const { return this->GetBits(5, 1) != 0; } constexpr ALWAYS_INLINE bool IsNonSecure() const { return this->GetBits(5, 1) != 0; }
constexpr ALWAYS_INLINE bool IsBlock() const { return this->GetBits(0, 2) == 0x1; } constexpr ALWAYS_INLINE bool IsBlock() const { return this->GetBits(0, 2) == 0x1; }
constexpr ALWAYS_INLINE bool IsTable() const { return this->GetBits(0, 2) == 0x3; } constexpr ALWAYS_INLINE bool IsTable() const { return this->GetBits(0, 2) == 0x3; }
/* Should not be called except by derived classes. */
constexpr ALWAYS_INLINE u64 GetRawAttributes() const {
return this->attributes;
}
}; };
static_assert(sizeof(PageTableEntry) == sizeof(u64)); static_assert(sizeof(PageTableEntry) == sizeof(u64));
constexpr PageTableEntry InvalidPageTableEntry = PageTableEntry(0);
constexpr size_t MaxPageTableEntries = PageSize / sizeof(PageTableEntry); constexpr size_t MaxPageTableEntries = PageSize / sizeof(PageTableEntry);
class L1PageTableEntry : public PageTableEntry { class L1PageTableEntry : public PageTableEntry {
@ -106,6 +113,7 @@ namespace ams::kern::init {
{ {
/* ... */ /* ... */
} }
constexpr ALWAYS_INLINE L1PageTableEntry(KPhysicalAddress phys_addr, const PageTableEntry &attr, bool contig) constexpr ALWAYS_INLINE L1PageTableEntry(KPhysicalAddress phys_addr, const PageTableEntry &attr, bool contig)
: PageTableEntry(attr, (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x1) : PageTableEntry(attr, (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x1)
{ {
@ -115,9 +123,15 @@ namespace ams::kern::init {
constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const { constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const {
return this->SelectBits(30, 18); return this->SelectBits(30, 18);
} }
constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const { constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const {
return this->SelectBits(12, 36); return this->SelectBits(12, 36);
} }
constexpr ALWAYS_INLINE bool IsCompatibleWithAttribute(const PageTableEntry &rhs) const {
/* Check whether this has the same permission/etc as the desired attributes. */
return (this->GetBlock() | rhs.GetRawAttributes()) == this->GetRawAttributes();
}
}; };
class L2PageTableEntry : public PageTableEntry { class L2PageTableEntry : public PageTableEntry {
@ -127,6 +141,7 @@ namespace ams::kern::init {
{ {
/* ... */ /* ... */
} }
constexpr ALWAYS_INLINE L2PageTableEntry(KPhysicalAddress phys_addr, const PageTableEntry &attr, bool contig) constexpr ALWAYS_INLINE L2PageTableEntry(KPhysicalAddress phys_addr, const PageTableEntry &attr, bool contig)
: PageTableEntry(attr, (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x1) : PageTableEntry(attr, (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x1)
{ {
@ -136,9 +151,15 @@ namespace ams::kern::init {
constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const { constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const {
return this->SelectBits(21, 27); return this->SelectBits(21, 27);
} }
constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const { constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const {
return this->SelectBits(12, 36); return this->SelectBits(12, 36);
} }
constexpr ALWAYS_INLINE bool IsCompatibleWithAttribute(const PageTableEntry &rhs) const {
/* Check whether this has the same permission/etc as the desired attributes. */
return (this->GetBlock() | rhs.GetRawAttributes()) == this->GetRawAttributes();
}
}; };
class L3PageTableEntry : public PageTableEntry { class L3PageTableEntry : public PageTableEntry {
@ -149,12 +170,16 @@ namespace ams::kern::init {
/* ... */ /* ... */
} }
constexpr ALWAYS_INLINE bool IsBlock() const { return this->GetBits(0, 2) == 0x3; }
constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const { constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const {
return this->SelectBits(21, 27);
}
constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const {
return this->SelectBits(12, 36); return this->SelectBits(12, 36);
} }
constexpr ALWAYS_INLINE bool IsCompatibleWithAttribute(const PageTableEntry &rhs) const {
/* Check whether this has the same permission/etc as the desired attributes. */
return (this->GetBlock() | rhs.GetRawAttributes()) == this->GetRawAttributes();
}
}; };
@ -171,6 +196,10 @@ namespace ams::kern::init {
constexpr ALWAYS_INLINE KInitialPageTable(KPhysicalAddress l1) : l1_table(l1) { constexpr ALWAYS_INLINE KInitialPageTable(KPhysicalAddress l1) : l1_table(l1) {
ClearNewPageTable(this->l1_table); ClearNewPageTable(this->l1_table);
} }
constexpr ALWAYS_INLINE uintptr_t GetL1TableAddress() const {
return GetInteger(this->l1_table);
}
private: private:
static constexpr ALWAYS_INLINE L1PageTableEntry *GetL1Entry(KPhysicalAddress _l1_table, KVirtualAddress address) { static constexpr ALWAYS_INLINE L1PageTableEntry *GetL1Entry(KPhysicalAddress _l1_table, KVirtualAddress address) {
L1PageTableEntry *l1_table = reinterpret_cast<L1PageTableEntry *>(GetInteger(_l1_table)); L1PageTableEntry *l1_table = reinterpret_cast<L1PageTableEntry *>(GetInteger(_l1_table));
@ -193,7 +222,7 @@ namespace ams::kern::init {
std::memset(reinterpret_cast<void *>(GetInteger(address)), 0, PageSize); std::memset(reinterpret_cast<void *>(GetInteger(address)), 0, PageSize);
} }
public: public:
void Map(KVirtualAddress virt_addr, size_t size, KPhysicalAddress phys_addr, const PageTableEntry &attr, IPageAllocator &allocator) { void NOINLINE Map(KVirtualAddress virt_addr, size_t size, KPhysicalAddress phys_addr, const PageTableEntry &attr, IPageAllocator &allocator) {
/* Ensure that addresses and sizes are page aligned. */ /* Ensure that addresses and sizes are page aligned. */
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), PageSize)); MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), PageSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(phys_addr), PageSize)); MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(phys_addr), PageSize));
@ -206,7 +235,8 @@ namespace ams::kern::init {
/* Can we make an L1 block? */ /* Can we make an L1 block? */
if (util::IsAligned(GetInteger(virt_addr), L1BlockSize) && util::IsAligned(GetInteger(phys_addr), L1BlockSize) && util::IsAligned(size, L1BlockSize)) { if (util::IsAligned(GetInteger(virt_addr), L1BlockSize) && util::IsAligned(GetInteger(phys_addr), L1BlockSize) && util::IsAligned(size, L1BlockSize)) {
*l1_entry = L1PageTableEntry(phys_addr, attr, false); *l1_entry = L1PageTableEntry(phys_addr, attr, false);
/* TODO: DataSynchronizationBarrier */ cpu::DataSynchronizationBarrierInnerShareable();
virt_addr += L1BlockSize; virt_addr += L1BlockSize;
phys_addr += L1BlockSize; phys_addr += L1BlockSize;
size -= L1BlockSize; size -= L1BlockSize;
@ -218,6 +248,7 @@ namespace ams::kern::init {
KPhysicalAddress new_table = allocator.Allocate(); KPhysicalAddress new_table = allocator.Allocate();
ClearNewPageTable(new_table); ClearNewPageTable(new_table);
*l1_entry = L1PageTableEntry(phys_addr, attr.IsPrivilegedExecuteNever()); *l1_entry = L1PageTableEntry(phys_addr, attr.IsPrivilegedExecuteNever());
cpu::DataSynchronizationBarrierInnerShareable();
} }
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr); L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
@ -226,10 +257,11 @@ namespace ams::kern::init {
if (util::IsAligned(GetInteger(virt_addr), L2ContiguousBlockSize) && util::IsAligned(GetInteger(phys_addr), L2ContiguousBlockSize) && util::IsAligned(size, L2ContiguousBlockSize)) { if (util::IsAligned(GetInteger(virt_addr), L2ContiguousBlockSize) && util::IsAligned(GetInteger(phys_addr), L2ContiguousBlockSize) && util::IsAligned(size, L2ContiguousBlockSize)) {
for (size_t i = 0; i < L2ContiguousBlockSize / L2BlockSize; i++) { for (size_t i = 0; i < L2ContiguousBlockSize / L2BlockSize; i++) {
l2_entry[i] = L2PageTableEntry(phys_addr, attr, true); l2_entry[i] = L2PageTableEntry(phys_addr, attr, true);
/* TODO: DataSynchronizationBarrier */ cpu::DataSynchronizationBarrierInnerShareable();
virt_addr += L2ContiguousBlockSize;
phys_addr += L2ContiguousBlockSize; virt_addr += L2BlockSize;
size -= L2ContiguousBlockSize; phys_addr += L2BlockSize;
size -= L2BlockSize;
} }
continue; continue;
} }
@ -237,7 +269,8 @@ namespace ams::kern::init {
/* Can we make an L2 block? */ /* Can we make an L2 block? */
if (util::IsAligned(GetInteger(virt_addr), L2BlockSize) && util::IsAligned(GetInteger(phys_addr), L2BlockSize) && util::IsAligned(size, L2BlockSize)) { if (util::IsAligned(GetInteger(virt_addr), L2BlockSize) && util::IsAligned(GetInteger(phys_addr), L2BlockSize) && util::IsAligned(size, L2BlockSize)) {
*l2_entry = L2PageTableEntry(phys_addr, attr, false); *l2_entry = L2PageTableEntry(phys_addr, attr, false);
/* TODO: DataSynchronizationBarrier */ cpu::DataSynchronizationBarrierInnerShareable();
virt_addr += L2BlockSize; virt_addr += L2BlockSize;
phys_addr += L2BlockSize; phys_addr += L2BlockSize;
size -= L2BlockSize; size -= L2BlockSize;
@ -249,6 +282,7 @@ namespace ams::kern::init {
KPhysicalAddress new_table = allocator.Allocate(); KPhysicalAddress new_table = allocator.Allocate();
ClearNewPageTable(new_table); ClearNewPageTable(new_table);
*l2_entry = L2PageTableEntry(phys_addr, attr.IsPrivilegedExecuteNever()); *l2_entry = L2PageTableEntry(phys_addr, attr.IsPrivilegedExecuteNever());
cpu::DataSynchronizationBarrierInnerShareable();
} }
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr); L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
@ -257,17 +291,18 @@ namespace ams::kern::init {
if (util::IsAligned(GetInteger(virt_addr), L3ContiguousBlockSize) && util::IsAligned(GetInteger(phys_addr), L3ContiguousBlockSize) && util::IsAligned(size, L3ContiguousBlockSize)) { if (util::IsAligned(GetInteger(virt_addr), L3ContiguousBlockSize) && util::IsAligned(GetInteger(phys_addr), L3ContiguousBlockSize) && util::IsAligned(size, L3ContiguousBlockSize)) {
for (size_t i = 0; i < L3ContiguousBlockSize / L3BlockSize; i++) { for (size_t i = 0; i < L3ContiguousBlockSize / L3BlockSize; i++) {
l3_entry[i] = L3PageTableEntry(phys_addr, attr, true); l3_entry[i] = L3PageTableEntry(phys_addr, attr, true);
/* TODO: DataSynchronizationBarrier */ cpu::DataSynchronizationBarrierInnerShareable();
virt_addr += L3ContiguousBlockSize;
phys_addr += L3ContiguousBlockSize; virt_addr += L3BlockSize;
size -= L3ContiguousBlockSize; phys_addr += L3BlockSize;
size -= L3BlockSize;
} }
continue; continue;
} }
/* Make an L3 block. */ /* Make an L3 block. */
*l3_entry = L3PageTableEntry(phys_addr, attr, false); *l3_entry = L3PageTableEntry(phys_addr, attr, false);
/* TODO: DataSynchronizationBarrier */ cpu::DataSynchronizationBarrierInnerShareable();
virt_addr += L3BlockSize; virt_addr += L3BlockSize;
phys_addr += L3BlockSize; phys_addr += L3BlockSize;
size -= L3BlockSize; size -= L3BlockSize;
@ -275,12 +310,187 @@ namespace ams::kern::init {
} }
bool IsFree(KVirtualAddress virt_addr, size_t size) { bool IsFree(KVirtualAddress virt_addr, size_t size) {
/* TODO */ /* Ensure that addresses and sizes are page aligned. */
return false; MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), PageSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, PageSize));
const KVirtualAddress end_virt_addr = virt_addr + size;
while (virt_addr < end_virt_addr) {
L1PageTableEntry *l1_entry = GetL1Entry(this->l1_table, virt_addr);
/* If an L1 block is mapped, the address isn't free. */
if (l1_entry->IsBlock()) {
return false;
}
if (!l1_entry->IsTable()) {
/* Not a table, so just move to check the next region. */
virt_addr = util::AlignDown(GetInteger(virt_addr) + L1BlockSize, L1BlockSize);
continue;
}
/* Table, so check if we're mapped in L2. */
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
return false;
}
if (!l2_entry->IsTable()) {
/* Not a table, so just move to check the next region. */
virt_addr = util::AlignDown(GetInteger(virt_addr) + L2BlockSize, L2BlockSize);
continue;
}
/* Table, so check if we're mapped in L3. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
if (l3_entry->IsBlock()) {
return false;
}
/* Not a block, so move on to check the next page. */
virt_addr = util::AlignDown(GetInteger(virt_addr) + L3BlockSize, L3BlockSize);
}
return true;
} }
void ReprotectFromReadWriteToRead(KVirtualAddress virt_addr, size_t size) { void Reprotect(KVirtualAddress virt_addr, size_t size, const PageTableEntry &attr_before, const PageTableEntry &attr_after) {
/* TODO */ /* Ensure data consistency before we begin reprotection. */
cpu::DataSynchronizationBarrierInnerShareable();
/* Ensure that addresses and sizes are page aligned. */
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), PageSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, PageSize));
/* Iteratively reprotect pages until the requested region is reprotected. */
while (size > 0) {
L1PageTableEntry *l1_entry = GetL1Entry(this->l1_table, virt_addr);
/* Check if an L1 block is present. */
if (l1_entry->IsBlock()) {
/* Ensure that we are allowed to have an L1 block here. */
const KPhysicalAddress block = l1_entry->GetBlock();
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L1BlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, L1BlockSize));
MESOSPHERE_ABORT_UNLESS(l1_entry->IsCompatibleWithAttribute(attr_before));
/* Invalidate the existing L1 block. */
*static_cast<PageTableEntry *>(l1_entry) = InvalidPageTableEntry;
cpu::DataSynchronizationBarrierInnerShareable();
cpu::InvalidateEntireTlb();
/* Create new L1 block. */
*l1_entry = L1PageTableEntry(block, attr_after, false);
virt_addr += L1BlockSize;
size -= L1BlockSize;
continue;
}
/* Not a block, so we must be a table. */
MESOSPHERE_ABORT_UNLESS(l1_entry->IsTable());
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
const KPhysicalAddress block = l2_entry->GetBlock();
if (l2_entry->IsContiguous()) {
/* Ensure that we are allowed to have a contiguous L2 block here. */
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L2ContiguousBlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(block), L2ContiguousBlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, L2ContiguousBlockSize));
/* Invalidate the existing contiguous L2 block. */
for (size_t i = 0; i < L2ContiguousBlockSize / L2BlockSize; i++) {
/* Ensure that the entry is valid. */
MESOSPHERE_ABORT_UNLESS(l2_entry[i].IsCompatibleWithAttribute(attr_before));
static_cast<PageTableEntry *>(l2_entry)[i] = InvalidPageTableEntry;
}
cpu::DataSynchronizationBarrierInnerShareable();
cpu::InvalidateEntireTlb();
/* Create a new contiguous L2 block. */
for (size_t i = 0; i < L2ContiguousBlockSize / L2BlockSize; i++) {
l2_entry[i] = L2PageTableEntry(block + L2BlockSize * i, attr_after, true);
}
virt_addr += L2ContiguousBlockSize;
size -= L2ContiguousBlockSize;
} else {
/* Ensure that we are allowed to have an L2 block here. */
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L2BlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(block), L2BlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, L2BlockSize));
MESOSPHERE_ABORT_UNLESS(l2_entry->IsCompatibleWithAttribute(attr_before));
/* Invalidate the existing L2 block. */
*static_cast<PageTableEntry *>(l2_entry) = InvalidPageTableEntry;
cpu::DataSynchronizationBarrierInnerShareable();
cpu::InvalidateEntireTlb();
/* Create new L2 block. */
*l2_entry = L2PageTableEntry(block, attr_after, false);
virt_addr += L2BlockSize;
size -= L2BlockSize;
}
continue;
}
/* Not a block, so we must be a table. */
MESOSPHERE_ABORT_UNLESS(l2_entry->IsTable());
/* We must have a mapped l3 entry to reprotect. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
MESOSPHERE_ABORT_UNLESS(l3_entry->IsBlock());
const KPhysicalAddress block = l3_entry->GetBlock();
if (l3_entry->IsContiguous()) {
/* Ensure that we are allowed to have a contiguous L3 block here. */
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L3ContiguousBlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(block), L3ContiguousBlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, L3ContiguousBlockSize));
/* Invalidate the existing contiguous L3 block. */
for (size_t i = 0; i < L3ContiguousBlockSize / L3BlockSize; i++) {
/* Ensure that the entry is valid. */
MESOSPHERE_ABORT_UNLESS(l3_entry[i].IsCompatibleWithAttribute(attr_before));
static_cast<PageTableEntry *>(l3_entry)[i] = InvalidPageTableEntry;
}
cpu::DataSynchronizationBarrierInnerShareable();
cpu::InvalidateEntireTlb();
/* Create a new contiguous L3 block. */
for (size_t i = 0; i < L3ContiguousBlockSize / L3BlockSize; i++) {
l3_entry[i] = L3PageTableEntry(block + L3BlockSize * i, attr_after, true);
}
virt_addr += L3ContiguousBlockSize;
size -= L3ContiguousBlockSize;
} else {
/* Ensure that we are allowed to have an L3 block here. */
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L3BlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(block), L3BlockSize));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(size, L3BlockSize));
MESOSPHERE_ABORT_UNLESS(l3_entry->IsCompatibleWithAttribute(attr_before));
/* Invalidate the existing L3 block. */
*static_cast<PageTableEntry *>(l3_entry) = InvalidPageTableEntry;
cpu::DataSynchronizationBarrierInnerShareable();
cpu::InvalidateEntireTlb();
/* Create new L3 block. */
*l3_entry = L3PageTableEntry(block, attr_after, false);
virt_addr += L3BlockSize;
size -= L3BlockSize;
}
}
/* Ensure data consistency after we complete reprotection. */
cpu::DataSynchronizationBarrierInnerShareable();
} }
}; };

58
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_cpu.hpp Normal file
View file

@ -0,0 +1,58 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours.hpp>
#include "kern_cpu_system_registers.hpp"
namespace ams::kern::arm64::cpu {
/* Helpers for managing memory state. */
ALWAYS_INLINE void DataSynchronizationBarrier() {
__asm__ __volatile__("dsb sy");
}
ALWAYS_INLINE void DataSynchronizationBarrierInnerShareable() {
__asm__ __volatile__("dsb ish");
}
ALWAYS_INLINE void DataMemoryBarrier() {
__asm__ __volatile__("dmb sy");
}
ALWAYS_INLINE void InstructionMemoryBarrier() {
__asm__ __volatile__("isb");
}
ALWAYS_INLINE void EnsureInstructionConsistency() {
DataSynchronizationBarrier();
InstructionMemoryBarrier();
}
ALWAYS_INLINE void InvalidateEntireInstructionCache() {
__asm__ __volatile__("ic iallu" ::: "memory");
EnsureInstructionConsistency();
}
/* Cache management helpers. */
void FlushEntireDataCacheShared();
void FlushEntireDataCacheLocal();
ALWAYS_INLINE void InvalidateEntireTlb() {
__asm__ __volatile__("tlbi vmalle1is" ::: "memory");
EnsureInstructionConsistency();
}
}

135
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_cpu_system_registers.hpp Normal file
View file

@ -0,0 +1,135 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours.hpp>
namespace ams::kern::arm64::cpu {
#define MESOSPHERE_CPU_GET_SYSREG(name) \
({ \
u64 temp_value; \
__asm__ __volatile__("mrs %0, " #name "" : "=&r"(temp_value) :: "memory"); \
temp_value; \
})
#define MESOSPHERE_CPU_SET_SYSREG(name, value) \
({ \
__asm__ __volatile__("msr " #name ", %0" :: "r"(value) : "memory", "cc"); \
})
#define MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(name, reg_name) \
ALWAYS_INLINE void Set##name(u64 value) { MESOSPHERE_CPU_SET_SYSREG(reg_name, value); } \
ALWAYS_INLINE u64 Get##name() { return MESOSPHERE_CPU_GET_SYSREG(reg_name); }
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(Ttbr0El1, ttbr0_el1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(Ttbr1El1, ttbr1_el1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(MairEl1, mair_el1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(TcrEl1, tcr_el1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(SctlrEl1, sctlr_el1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CpuActlrEl1, s3_1_c15_c2_0)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CpuEctlrEl1, s3_1_c15_c2_1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CsselrEl1, csselr_el1)
/* Base class for register accessors. */
class GenericRegisterAccessor {
private:
u64 value;
public:
ALWAYS_INLINE GenericRegisterAccessor(u64 v) : value(v) { /* ... */ }
protected:
constexpr ALWAYS_INLINE u64 GetBits(size_t offset, size_t count) const {
return (this->value >> offset) & ((1 << count) - 1);
}
};
/* Special code for main id register. */
class MainIdRegisterAccessor : public GenericRegisterAccessor {
public:
enum class Implementer {
ArmLimited = 0x41,
};
enum class PrimaryPartNumber {
CortexA53 = 0xD03,
CortexA57 = 0xD07,
};
public:
ALWAYS_INLINE MainIdRegisterAccessor() : GenericRegisterAccessor(MESOSPHERE_CPU_GET_SYSREG(midr_el1)) { /* ... */ }
public:
constexpr ALWAYS_INLINE Implementer GetImplementer() const {
return static_cast<Implementer>(this->GetBits(24, 8));
}
constexpr ALWAYS_INLINE u64 GetVariant() const {
return this->GetBits(20, 4);
}
constexpr ALWAYS_INLINE u64 GetArchitecture() const {
return this->GetBits(16, 4);
}
constexpr ALWAYS_INLINE PrimaryPartNumber GetPrimaryPartNumber() const {
return static_cast<PrimaryPartNumber>(this->GetBits(4, 12));
}
constexpr ALWAYS_INLINE u64 GetRevision() const {
return this->GetBits(0, 4);
}
};
/* Accessors for cache registers. */
class CacheLineIdAccessor : public GenericRegisterAccessor {
public:
ALWAYS_INLINE CacheLineIdAccessor() : GenericRegisterAccessor(MESOSPHERE_CPU_GET_SYSREG(clidr_el1)) { /* ... */ }
public:
constexpr ALWAYS_INLINE int GetLevelsOfCoherency() const {
return static_cast<int>(this->GetBits(24, 3));
}
constexpr ALWAYS_INLINE int GetLevelsOfUnification() const {
return static_cast<int>(this->GetBits(21, 3));
}
/* TODO: Other bitfield accessors? */
};
class CacheSizeIdAccessor : public GenericRegisterAccessor {
public:
ALWAYS_INLINE CacheSizeIdAccessor() : GenericRegisterAccessor(MESOSPHERE_CPU_GET_SYSREG(ccsidr_el1)) { /* ... */ }
public:
constexpr ALWAYS_INLINE int GetNumberOfSets() const {
return static_cast<int>(this->GetBits(13, 15));
}
constexpr ALWAYS_INLINE int GetAssociativity() const {
return static_cast<int>(this->GetBits(3, 10));
}
constexpr ALWAYS_INLINE int GetLineSize() const {
return static_cast<int>(this->GetBits(0, 3));
}
/* TODO: Other bitfield accessors? */
};
#undef MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS
#undef MESOSPHERE_CPU_GET_SYSREG
#undef MESOSPHERE_CPU_SET_SYSREG
}

47
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_hardware_registers.hpp
View file

@ -1,47 +0,0 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
From musl include/elf.h
Copyright © 2005-2014 Rich Felker, et al.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#pragma once
#include <vapours.hpp>
namespace ams::kern::hw {
}

4
libraries/libmesosphere/include/mesosphere/board/nintendo/switch/kern_k_system_control.hpp
View file

@ -25,6 +25,10 @@ namespace ams::kern {
static KPhysicalAddress GetKernelPhysicalBaseAddress(uintptr_t base_address); static KPhysicalAddress GetKernelPhysicalBaseAddress(uintptr_t base_address);
static bool ShouldIncreaseResourceRegionSize(); static bool ShouldIncreaseResourceRegionSize();
/* Randomness. */
static void GenerateRandomBytes(void *dst, size_t size);
static u64 GenerateRandomRange(u64 min, u64 max);
/* Panic. */ /* Panic. */
static NORETURN void StopSystem(); static NORETURN void StopSystem();
}; };

2
libraries/libmesosphere/include/mesosphere/init/kern_init_layout.hpp
View file

@ -28,7 +28,7 @@ namespace ams::kern::init {
u32 bss_offset; u32 bss_offset;
u32 bss_end_offset; u32 bss_end_offset;
u32 ini_end_offset; u32 ini_end_offset;
u32 dynamic_end_offset; u32 dynamic_offset;
u32 init_array_offset; u32 init_array_offset;
u32 init_array_end_offset; u32 init_array_end_offset;
}; };

29
libraries/libmesosphere/include/mesosphere/kern_select_cpu.hpp Normal file
View file

@ -0,0 +1,29 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef ATMOSPHERE_ARCH_ARM64
#include "arch/arm64/kern_cpu.hpp"
namespace ams::kern::cpu {
using namespace ams::kern::arm64::cpu;
}
#else
#error "Unknown architecture for CPU"
#endif

69
libraries/libmesosphere/source/arch/arm64/kern_cpu.cpp Normal file
View file

@ -0,0 +1,69 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern::arm64::cpu {
namespace {
void FlushEntireDataCacheImpl(int level) {
/* Used in multiple locations. */
const u64 level_sel_value = static_cast<u64>(level << 1);
/* Set selection register. */
cpu::SetCsselrEl1(level_sel_value);
cpu::InstructionMemoryBarrier();
/* Get cache size id info. */
CacheSizeIdAccessor ccsidr_el1;
const int num_sets = ccsidr_el1.GetNumberOfSets();
const int num_ways = ccsidr_el1.GetAssociativity();
const int line_size = ccsidr_el1.GetLineSize();
const u64 way_shift = static_cast<u64>(__builtin_clz(num_ways));
const u64 set_shift = static_cast<u64>(line_size + 4);
for (int way = 0; way <= num_ways; way++) {
for (int set = 0; set <= num_sets; set++) {
const u64 way_value = static_cast<u64>(way) << way_shift;
const u64 set_value = static_cast<u64>(set) << set_shift;
const u64 cisw_value = way_value | set_value | level_sel_value;
__asm__ __volatile__("dc cisw, %0" ::"r"(cisw_value) : "memory");
}
}
}
}
void FlushEntireDataCacheShared() {
CacheLineIdAccessor clidr_el1;
const int levels_of_coherency = clidr_el1.GetLevelsOfCoherency();
const int levels_of_unification = clidr_el1.GetLevelsOfUnification();
for (int level = levels_of_coherency; level >= levels_of_unification; level--) {
FlushEntireDataCacheImpl(level);
}
}
void FlushEntireDataCacheLocal() {
CacheLineIdAccessor clidr_el1;
const int levels_of_unification = clidr_el1.GetLevelsOfUnification();
for (int level = levels_of_unification - 1; level >= 0; level--) {
FlushEntireDataCacheImpl(level);
}
}
}

24
libraries/libmesosphere/source/board/nintendo/switch/kern_k_system_control.cpp
View file

@ -39,6 +39,12 @@ namespace ams::kern {
return value; return value;
} }
inline u64 GenerateRandomU64() {
u64 value;
smc::GenerateRandomBytes(&value, sizeof(value));
return value;
}
inline smc::MemoryMode GetMemoryMode() { inline smc::MemoryMode GetMemoryMode() {
return static_cast<smc::MemoryMode>((GetKernelConfiguration() >> 10) & 0x3); return static_cast<smc::MemoryMode>((GetKernelConfiguration() >> 10) & 0x3);
} }
@ -73,6 +79,24 @@ namespace ams::kern {
return (GetKernelConfiguration() >> 3) & 1; return (GetKernelConfiguration() >> 3) & 1;
} }
/* Randomness. */
void KSystemControl::GenerateRandomBytes(void *dst, size_t size) {
MESOSPHERE_ABORT_UNLESS(size <= 0x38);
smc::GenerateRandomBytes(dst, size);
}
u64 KSystemControl::GenerateRandomRange(u64 min, u64 max) {
/* This is a biased random, but this is okay for now. */
/* TODO: unbiased random? */
const u64 range_size = ((max + 1) - min);
const u64 effective_max = (std::numeric_limits<u64>::max() / range_size) * range_size;
while (true) {
if (const u64 rnd = GenerateRandomU64(); rnd < effective_max) {
return rnd % effective_max;
}
}
}
void KSystemControl::StopSystem() { void KSystemControl::StopSystem() {
/* Display a panic screen via exosphere. */ /* Display a panic screen via exosphere. */
smc::Panic(0xF00); smc::Panic(0xF00);

12
libraries/libmesosphere/source/board/nintendo/switch/kern_secure_monitor.cpp
View file

@ -80,6 +80,18 @@ namespace ams::kern::smc {
} }
} }
void GenerateRandomBytes(void *dst, size_t size) {
/* Call SmcGenerateRandomBytes() */
/* TODO: Lock this to ensure only one core calls at once. */
SecureMonitorArguments args = { FunctionId_GetConfig, size };
MESOSPHERE_ABORT_UNLESS(size <= sizeof(args) - sizeof(args.x[0]));
CallPrivilegedSecureMonitorFunction(args);
MESOSPHERE_ABORT_UNLESS((static_cast<SmcResult>(args.x[0]) == SmcResult::Success));
/* Copy output. */
std::memcpy(dst, &args.x[1], size);
}
void NORETURN Panic(u32 color) { void NORETURN Panic(u32 color) {
SecureMonitorArguments args = { FunctionId_Panic, color }; SecureMonitorArguments args = { FunctionId_Panic, color };
CallPrivilegedSecureMonitorFunction(args); CallPrivilegedSecureMonitorFunction(args);

1
libraries/libmesosphere/source/board/nintendo/switch/kern_secure_monitor.hpp
View file

@ -65,6 +65,7 @@ namespace ams::kern::smc {
/* TODO: Rest of Secure Monitor API. */ /* TODO: Rest of Secure Monitor API. */
void GetConfig(u64 *out, size_t num_qwords, ConfigItem config_item); void GetConfig(u64 *out, size_t num_qwords, ConfigItem config_item);
void GenerateRandomBytes(void *dst, size_t size);
void NORETURN Panic(u32 color); void NORETURN Panic(u32 color);
bool ReadWriteRegister(u32 *out, u64 address, u32 mask, u32 value); bool ReadWriteRegister(u32 *out, u64 address, u32 mask, u32 value);

1
libraries/libvapours/include/vapours/defines.hpp
View file

@ -35,6 +35,7 @@
#define NORETURN __attribute__((noreturn)) #define NORETURN __attribute__((noreturn))
#define WEAK_SYMBOL __attribute__((weak)) #define WEAK_SYMBOL __attribute__((weak))
#define ALWAYS_INLINE inline __attribute__((always_inline)) #define ALWAYS_INLINE inline __attribute__((always_inline))
#define NOINLINE __attribute__((noinline))
#define CONST_FOLD(x) (__builtin_constant_p(x) ? (x) : (x)) #define CONST_FOLD(x) (__builtin_constant_p(x) ? (x) : (x))

201
mesosphere/kernel_ldr/source/kern_init_loader.cpp
View file

@ -14,6 +14,15 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>. * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
#include <mesosphere.hpp> #include <mesosphere.hpp>
#include "kern_init_loader_asm.hpp"
/* Necessary for calculating kernelldr size/base for initial identity mapping */
extern "C" {
extern const u8 __start__[];
extern const u8 __end__[];
}
namespace ams::kern::init::loader { namespace ams::kern::init::loader {
@ -67,6 +76,26 @@ namespace ams::kern::init::loader {
} }
} }
void EnsureEntireDataCacheFlushed() {
/* Flush shared cache. */
cpu::FlushEntireDataCacheShared();
cpu::DataSynchronizationBarrier();
/* Flush local cache. */
cpu::FlushEntireDataCacheLocal();
cpu::DataSynchronizationBarrier();
/* Flush shared cache. */
cpu::FlushEntireDataCacheShared();
cpu::DataSynchronizationBarrier();
/* Invalidate entire instruction cache. */
cpu::InvalidateEntireInstructionCache();
/* Invalidate entire TLB. */
cpu::InvalidateEntireTlb();
}
void SetupInitialIdentityMapping(KInitialPageTable &ttbr1_table, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageTable::IPageAllocator &allocator) { void SetupInitialIdentityMapping(KInitialPageTable &ttbr1_table, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageTable::IPageAllocator &allocator) {
/* Make a new page table for TTBR0_EL1. */ /* Make a new page table for TTBR0_EL1. */
KInitialPageTable ttbr0_table(allocator.Allocate()); KInitialPageTable ttbr0_table(allocator.Allocate());
@ -77,7 +106,139 @@ namespace ams::kern::init::loader {
/* Map in an RWX identity mapping for ourselves. */ /* Map in an RWX identity mapping for ourselves. */
constexpr PageTableEntry KernelLdrRWXIdentityAttribute(PageTableEntry::Permission_KernelRWX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable); constexpr PageTableEntry KernelLdrRWXIdentityAttribute(PageTableEntry::Permission_KernelRWX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable);
//ttbr0_table.Map(base_address, kernel_size, base_address, KernelRWXIdentityAttribute, allocator); const uintptr_t kernel_ldr_base = util::AlignDown(reinterpret_cast<uintptr_t>(__start__), PageSize);
const uintptr_t kernel_ldr_size = util::AlignUp(reinterpret_cast<uintptr_t>(__end__), PageSize) - kernel_ldr_base;
ttbr0_table.Map(kernel_ldr_base, kernel_ldr_size, kernel_ldr_base, KernelRWXIdentityAttribute, allocator);
/* Map in the page table region as RW- for ourselves. */
constexpr PageTableEntry PageTableRegionRWAttribute(PageTableEntry::Permission_KernelRW, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable);
ttbr0_table.Map(page_table_region, page_table_region_size, page_table_region, KernelRWXIdentityAttribute, allocator);
/* Place the L1 table addresses in the relevant system registers. */
cpu::SetTtbr0El1(ttbr0_table.GetL1TableAddress());
cpu::SetTtbr1El1(ttbr1_table.GetL1TableAddress());
/* Setup MAIR_EL1, TCR_EL1. */
/* TODO: Define these bits properly elsewhere, document exactly what each bit set is doing .*/
constexpr u64 MairValue = 0x0000000044FF0400ul;
constexpr u64 TcrValue = 0x00000011B5193519ul;
cpu::SetMairEl1(MairValue);
cpu::SetTcrEl1(TcrValue);
/* Perform cpu-specific setup. */
{
SavedRegisterState saved_registers;
SaveRegistersToTpidrEl1(&saved_registers);
ON_SCOPE_EXIT { VerifyAndClearTpidrEl1(&saved_registers); };
/* Main ID specific setup. */
cpu::MainIdRegisterAccessor midr_el1;
if (midr_el1.GetImplementer() == cpu::MainIdRegisterAccessor::Implementer::ArmLimited) {
/* ARM limited specific setup. */
const auto cpu_primary_part = midr_el1.GetPrimaryPartNumber();
const auto cpu_variant = midr_el1.GetVariant();
const auto cpu_revision = midr_el1.GetRevision();
if (cpu_primary_part == cpu::MainIdRegisterAccessor::PrimaryPartNumber::CortexA57) {
/* Cortex-A57 specific setup. */
/* Non-cacheable load forwarding enabled. */
u64 cpuactlr_value = 0x1000000;
/* Enable the processor to receive instruction cache and TLB maintenance */
/* operations broadcast from other processors in the cluster; */
/* set the L2 load/store data prefetch distance to 8 requests; */
/* set the L2 instruction fetch prefetch distance to 3 requests. */
u64 cpuectlr_value = 0x1B00000040;
/* Disable load-pass DMB on certain hardware variants. */
if (cpu_variant == 0 || (cpu_variant == 1 && cpu_revision <= 1)) {
cpuactlr_value |= 0x800000000000000;
}
/* Set actlr and ectlr. */
if (cpu::GetCpuActlrEl1() != cpuactlr_value) {
cpu::SetCpuActlrEl1(cpuactlr_value);
}
if (cpu::GetCpuEctlrEl1() != cpuectlr_value) {
cpu::SetCpuEctlrEl1(cpuectlr_value);
}
} else if (cpu_primary_part == cpu::MainIdRegisterAccessor::PrimaryPartNumber::CortexA53) {
/* Cortex-A53 specific setup. */
/* Set L1 data prefetch control to allow 5 outstanding prefetches; */
/* enable device split throttle; */
/* set the number of independent data prefetch streams to 2; */
/* disable transient and no-read-allocate hints for loads; */
/* set write streaming no-allocate threshold so the 128th consecutive streaming */
/* cache line does not allocate in the L1 or L2 cache. */
u64 cpuactlr_value = 0x90CA000;
/* Enable hardware management of data coherency with other cores in the cluster. */
u64 cpuectlr_value = 0x40;
/* If supported, enable data cache clean as data cache clean/invalidate. */
if (cpu_variant != 0 || (cpu_variant == 0 && cpu_revision > 2)) {
cpuactlr_value |= 0x100000000000;
}
/* Set actlr and ectlr. */
if (cpu::GetCpuActlrEl1() != cpuactlr_value) {
cpu::SetCpuActlrEl1(cpuactlr_value);
}
if (cpu::GetCpuEctlrEl1() != cpuectlr_value) {
cpu::SetCpuEctlrEl1(cpuectlr_value);
}
}
}
}
/* Ensure that the entire cache is flushed. */
EnsureEntireDataCacheFlushed();
/* Setup SCTLR_EL1. */
/* TODO: Define these bits properly elsewhere, document exactly what each bit set is doing .*/
constexpr u64 SctlrValue = 0x0000000034D5D925ul;
cpu::SetSctlrEl1(SctlrValue);
cpu::EnsureInstructionConsistency();
}
KVirtualAddress GetRandomKernelBaseAddress(KInitialPageTable &page_table, KPhysicalAddress phys_base_address, size_t kernel_size) {
/* Define useful values for random generation. */
constexpr uintptr_t KernelBaseAlignment = 0x200000;
constexpr uintptr_t KernelBaseRangeMin = 0xFFFFFF8000000000;
constexpr uintptr_t KernelBaseRangeMax = 0xFFFFFFFFFFE00000;
constexpr uintptr_t KernelBaseRangeEnd = KernelBaseRangeMax - 1;
static_assert(util::IsAligned(KernelBaseRangeMin, KernelBaseAlignment));
static_assert(util::IsAligned(KernelBaseRangeMax, KernelBaseAlignment));
static_assert(KernelBaseRangeMin <= KernelBaseRangeEnd);
const uintptr_t kernel_offset = GetInteger(phys_base_address) % KernelBaseAlignment;
/* Repeatedly generate a random virtual address until we get one that's unmapped in the destination page table. */
while (true) {
const KVirtualAddress random_kaslr_slide = KSystemControl::GenerateRandomRange(KernelBaseRangeMin, KernelBaseRangeEnd);
const KVirtualAddress kernel_region_start = util::AlignDown(GetInteger(random_kaslr_slide), KernelBaseAlignment);
const KVirtualAddress kernel_region_end = util::AlignUp(GetInteger(kernel_region_start) + kernel_offset + kernel_size, KernelBaseAlignment);
const size_t kernel_region_size = GetInteger(kernel_region_end) - GetInteger(kernel_region_start);
/* Make sure the region has not overflowed */
if (kernel_region_start >= kernel_region_end) {
continue;
}
/* Make sure that the region stays within our intended bounds. */
if (kernel_region_end > KernelBaseRangeMax) {
continue;
}
/* Validate we can map the range we've selected. */
if (!page_table.IsFree(kernel_region_start, kernel_region_size)) {
continue;
}
/* Our range is valid! */
return kernel_region_start + kernel_offset;
}
} }
} }
@ -104,11 +265,10 @@ namespace ams::kern::init::loader {
MESOSPHERE_ABORT_UNLESS(util::IsAligned(ro_offset, 0x1000)); MESOSPHERE_ABORT_UNLESS(util::IsAligned(ro_offset, 0x1000));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(ro_end_offset, 0x1000)); MESOSPHERE_ABORT_UNLESS(util::IsAligned(ro_end_offset, 0x1000));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(rw_offset, 0x1000)); MESOSPHERE_ABORT_UNLESS(util::IsAligned(rw_offset, 0x1000));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(rw_end_offset, 0x1000));
MESOSPHERE_ABORT_UNLESS(util::IsAligned(bss_end_offset, 0x1000)); MESOSPHERE_ABORT_UNLESS(util::IsAligned(bss_end_offset, 0x1000));
const uintptr_t bss_offset = layout->bss_offset; const uintptr_t bss_offset = layout->bss_offset;
const uintptr_t ini_end_offset = layout->ini_end_offset; const uintptr_t ini_end_offset = layout->ini_end_offset;
const uintptr_t dynamic_end_offset = layout->dynamic_end_offset; const uintptr_t dynamic_offset = layout->dynamic_offset;
const uintptr_t init_array_offset = layout->init_array_offset; const uintptr_t init_array_offset = layout->init_array_offset;
const uintptr_t init_array_end_offset = layout->init_array_end_offset; const uintptr_t init_array_end_offset = layout->init_array_end_offset;
@ -140,16 +300,35 @@ namespace ams::kern::init::loader {
/* Setup initial identity mapping. TTBR1 table passed by reference. */ /* Setup initial identity mapping. TTBR1 table passed by reference. */
SetupInitialIdentityMapping(ttbr1_table, base_address, bss_end_offset, ini_end_address, InitialPageTableRegionSize, g_initial_page_allocator); SetupInitialIdentityMapping(ttbr1_table, base_address, bss_end_offset, ini_end_address, InitialPageTableRegionSize, g_initial_page_allocator);
/* TODO: Use these. */ /* Generate a random slide for the kernel's base address. */
(void)(bss_offset); const KVirtualAddress virtual_base_address = GetRandomKernelBaseAddress(ttbr1_table, base_address, bss_end_offset);
(void)(ini_end_offset);
(void)(dynamic_end_offset);
(void)(init_array_offset);
(void)(init_array_end_offset);
/* Map kernel .text as R-X. */
constexpr PageTableEntry KernelTextAttribute(PageTableEntry::Permission_KernelRX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable);
ttbr1_table.Map(virtual_base_address + rx_offset, rx_end_offset - rx_offset, base_address + rx_offset, KernelTextAttribute, g_initial_page_allocator);
/* TODO */ /* Map kernel .rodata and .rwdata as RW-. */
return 0; /* Note that we will later reprotect .rodata as R-- */
constexpr PageTableEntry KernelRoDataAttribute(PageTableEntry::Permission_KernelR, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable);
constexpr PageTableEntry KernelRwDataAttribute(PageTableEntry::Permission_KernelRW, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable);
ttbr1_table.Map(virtual_base_address + ro_offset, ro_end_offset - ro_offset, base_address + ro_offset, KernelRwDataAttribute, g_initial_page_allocator);
ttbr1_table.Map(virtual_base_address + rw_offset, bss_end_offset - rw_offset, base_address + rw_offset, KernelRwDataAttribute, g_initial_page_allocator);
/* Clear kernel .bss. */
std::memset(GetVoidPointer(virtual_base_address + bss_offset), 0, bss_end_offset - rw_end_offset);
/* Apply relocations to the kernel. */
const Elf::Elf64::Dyn *kernel_dynamic = reinterpret_cast<const Elf::Elf64::Dyn *>(GetInteger(virtual_base_address) + dynamic_offset);
Elf::Elf64::ApplyRelocations(GetInteger(virtual_base_address), kernel_dynamic);
/* Reprotect .rodata as R-- */
ttbr1_table.Reprotect(virtual_base_address + ro_offset, ro_end_offset - ro_offset, KernelRwDataAttribute, KernelRoDataAttribute);
/* Call the kernel's init array functions. */
Elf::Elf64::CallInitArrayFuncs(GetInteger(virtual_base_address) + init_array_offset, GetInteger(virtual_base_address) + init_array_end_offset);
/* Return the difference between the random virtual base and the physical base. */
return GetInteger(virtual_base_address) - base_address;
} }
void Finalize() { void Finalize() {

31
mesosphere/kernel_ldr/source/kern_init_loader_asm.hpp Normal file
View file

@ -0,0 +1,31 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <mesosphere.hpp>
namespace ams::kern::init::loader {
struct SavedRegisterState {
u64 x[(30 - 19) + 1];
u64 sp;
u64 xzr;
};
static_assert(sizeof(SavedRegisterState) == 0x70);
int SaveRegistersToTpidrEl1(void *tpidr_el1);
void VerifyAndClearTpidrEl1(void *tpidr_el1);
}

48
mesosphere/kernel_ldr/source/kern_init_loader_asm.s Normal file
View file

@ -0,0 +1,48 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
.section .text._ZN3ams4kern4init6loader23SaveRegistersToTpidrEl1EPv, "ax", %progbits
.global _ZN3ams4kern4init6loader23SaveRegistersToTpidrEl1EPv
_ZN3ams4kern4init6loader23SaveRegistersToTpidrEl1EPv:
/* Set TPIDR_EL1 to the input register. */
msr tpidr_el1, x0
/* Save registers to the region specified. */
mov x1, sp
stp x19, x20, [x0], #0x10
stp x21, x22, [x0], #0x10
stp x23, x24, [x0], #0x10
stp x25, x26, [x0], #0x10
stp x27, x28, [x0], #0x10
stp x29, x30, [x0], #0x10
stp x1, xzr, [x0], #0x10
mov x0, #0x0
ret
.section .text._ZN3ams4kern4init6loader22VerifyAndClearTpidrEl1EPv, "ax", %progbits
.global _ZN3ams4kern4init6loader22VerifyAndClearTpidrEl1EPv
_ZN3ams4kern4init6loader22VerifyAndClearTpidrEl1EPv:
/* Get system register area from thread-specific processor id */
mrs x1, tpidr_el1
/* We require here that the region registers are saved is same as input. */
cmp x0, x1
invalid_tpidr:
b.ne invalid_tpidr
/* Clear TPIDR_EL1. */
msr tpidr_el1, xzr
ret

2
mesosphere/kernel_ldr/source/start.s
View file

@ -80,7 +80,7 @@ _start:
/* Return to the newly-relocated kernel. */ /* Return to the newly-relocated kernel. */
ldr x1, [sp, #0x18] /* Return address to Kernel */ ldr x1, [sp, #0x18] /* Return address to Kernel */
ldr x2, [sp, #0x00] /* Relocated kernel base address. */ ldr x2, [sp, #0x00] /* Relocated kernel base address diff. */
add x1, x2, x1 add x1, x2, x1
br x1 br x1