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author | Yuri Kunde Schlesner <yuriks@yuriks.net> | 2015-05-30 03:00:17 +0200 |
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committer | Yuri Kunde Schlesner <yuriks@yuriks.net> | 2015-05-30 03:00:17 +0200 |
commit | 8a04c65e20ba1f5c472c026b7a558e1d54324306 (patch) | |
tree | c11c0c6a472184f25479b0679748ee71653a2985 /src/core/hle/kernel/vm_manager.cpp | |
parent | Merge pull request #818 from linkmauve/no-trailing-whitespace (diff) | |
parent | Memmap: Remove unused global pointers to memory areas (diff) | |
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Diffstat (limited to 'src/core/hle/kernel/vm_manager.cpp')
-rw-r--r-- | src/core/hle/kernel/vm_manager.cpp | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/core/hle/kernel/vm_manager.cpp b/src/core/hle/kernel/vm_manager.cpp new file mode 100644 index 000000000..b2dd21542 --- /dev/null +++ b/src/core/hle/kernel/vm_manager.cpp @@ -0,0 +1,245 @@ +// Copyright 2015 Citra Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include "common/assert.h" + +#include "core/hle/kernel/vm_manager.h" +#include "core/memory_setup.h" + +namespace Kernel { + +bool VirtualMemoryArea::CanBeMergedWith(const VirtualMemoryArea& next) const { + ASSERT(base + size == next.base); + if (permissions != next.permissions || + meminfo_state != next.meminfo_state || + type != next.type) { + return false; + } + if (type == VMAType::AllocatedMemoryBlock && + (backing_block != next.backing_block || offset + size != next.offset)) { + return false; + } + if (type == VMAType::BackingMemory && backing_memory + size != next.backing_memory) { + return false; + } + if (type == VMAType::MMIO && paddr + size != next.paddr) { + return false; + } + return true; +} + +VMManager::VMManager() { + Reset(); +} + +void VMManager::Reset() { + vma_map.clear(); + + // Initialize the map with a single free region covering the entire managed space. + VirtualMemoryArea initial_vma; + initial_vma.size = MAX_ADDRESS; + vma_map.emplace(initial_vma.base, initial_vma); + + UpdatePageTableForVMA(initial_vma); +} + +VMManager::VMAHandle VMManager::FindVMA(VAddr target) const { + return std::prev(vma_map.upper_bound(target)); +} + +ResultVal<VMManager::VMAHandle> VMManager::MapMemoryBlock(VAddr target, + std::shared_ptr<std::vector<u8>> block, u32 offset, u32 size, MemoryState state) { + ASSERT(block != nullptr); + ASSERT(offset + size <= block->size()); + + // This is the appropriately sized VMA that will turn into our allocation. + CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size)); + VirtualMemoryArea& final_vma = vma_handle->second; + ASSERT(final_vma.size == size); + + final_vma.type = VMAType::AllocatedMemoryBlock; + final_vma.permissions = VMAPermission::ReadWrite; + final_vma.meminfo_state = state; + final_vma.backing_block = block; + final_vma.offset = offset; + UpdatePageTableForVMA(final_vma); + + return MakeResult<VMAHandle>(MergeAdjacent(vma_handle)); +} + +ResultVal<VMManager::VMAHandle> VMManager::MapBackingMemory(VAddr target, u8 * memory, u32 size, MemoryState state) { + ASSERT(memory != nullptr); + + // This is the appropriately sized VMA that will turn into our allocation. + CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size)); + VirtualMemoryArea& final_vma = vma_handle->second; + ASSERT(final_vma.size == size); + + final_vma.type = VMAType::BackingMemory; + final_vma.permissions = VMAPermission::ReadWrite; + final_vma.meminfo_state = state; + final_vma.backing_memory = memory; + UpdatePageTableForVMA(final_vma); + + return MakeResult<VMAHandle>(MergeAdjacent(vma_handle)); +} + +ResultVal<VMManager::VMAHandle> VMManager::MapMMIO(VAddr target, PAddr paddr, u32 size, MemoryState state) { + // This is the appropriately sized VMA that will turn into our allocation. + CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size)); + VirtualMemoryArea& final_vma = vma_handle->second; + ASSERT(final_vma.size == size); + + final_vma.type = VMAType::MMIO; + final_vma.permissions = VMAPermission::ReadWrite; + final_vma.meminfo_state = state; + final_vma.paddr = paddr; + UpdatePageTableForVMA(final_vma); + + return MakeResult<VMAHandle>(MergeAdjacent(vma_handle)); +} + +void VMManager::Unmap(VMAHandle vma_handle) { + VMAIter iter = StripIterConstness(vma_handle); + + VirtualMemoryArea& vma = iter->second; + vma.type = VMAType::Free; + vma.permissions = VMAPermission::None; + vma.meminfo_state = MemoryState::Free; + + vma.backing_block = nullptr; + vma.offset = 0; + vma.backing_memory = nullptr; + vma.paddr = 0; + + UpdatePageTableForVMA(vma); + + MergeAdjacent(iter); +} + +void VMManager::Reprotect(VMAHandle vma_handle, VMAPermission new_perms) { + VMAIter iter = StripIterConstness(vma_handle); + + VirtualMemoryArea& vma = iter->second; + vma.permissions = new_perms; + UpdatePageTableForVMA(vma); + + MergeAdjacent(iter); +} + +VMManager::VMAIter VMManager::StripIterConstness(const VMAHandle & iter) { + // This uses a neat C++ trick to convert a const_iterator to a regular iterator, given + // non-const access to its container. + return vma_map.erase(iter, iter); // Erases an empty range of elements +} + +ResultVal<VMManager::VMAIter> VMManager::CarveVMA(VAddr base, u32 size) { + ASSERT_MSG((size & Memory::PAGE_MASK) == 0, "non-page aligned size: %8X", size); + ASSERT_MSG((base & Memory::PAGE_MASK) == 0, "non-page aligned base: %08X", base); + + VMAIter vma_handle = StripIterConstness(FindVMA(base)); + if (vma_handle == vma_map.end()) { + // Target address is outside the range managed by the kernel + return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS, + ErrorSummary::InvalidArgument, ErrorLevel::Usage); // 0xE0E01BF5 + } + + VirtualMemoryArea& vma = vma_handle->second; + if (vma.type != VMAType::Free) { + // Region is already allocated + return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS, + ErrorSummary::InvalidState, ErrorLevel::Usage); // 0xE0A01BF5 + } + + u32 start_in_vma = base - vma.base; + u32 end_in_vma = start_in_vma + size; + + if (end_in_vma > vma.size) { + // Requested allocation doesn't fit inside VMA + return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS, + ErrorSummary::InvalidState, ErrorLevel::Usage); // 0xE0A01BF5 + } + + if (end_in_vma != vma.size) { + // Split VMA at the end of the allocated region + SplitVMA(vma_handle, end_in_vma); + } + if (start_in_vma != 0) { + // Split VMA at the start of the allocated region + vma_handle = SplitVMA(vma_handle, start_in_vma); + } + + return MakeResult<VMAIter>(vma_handle); +} + +VMManager::VMAIter VMManager::SplitVMA(VMAIter vma_handle, u32 offset_in_vma) { + VirtualMemoryArea& old_vma = vma_handle->second; + VirtualMemoryArea new_vma = old_vma; // Make a copy of the VMA + + // For now, don't allow no-op VMA splits (trying to split at a boundary) because it's probably + // a bug. This restriction might be removed later. + ASSERT(offset_in_vma < old_vma.size); + ASSERT(offset_in_vma > 0); + + old_vma.size = offset_in_vma; + new_vma.base += offset_in_vma; + new_vma.size -= offset_in_vma; + + switch (new_vma.type) { + case VMAType::Free: + break; + case VMAType::AllocatedMemoryBlock: + new_vma.offset += offset_in_vma; + break; + case VMAType::BackingMemory: + new_vma.backing_memory += offset_in_vma; + break; + case VMAType::MMIO: + new_vma.paddr += offset_in_vma; + break; + } + + ASSERT(old_vma.CanBeMergedWith(new_vma)); + + return vma_map.emplace_hint(std::next(vma_handle), new_vma.base, new_vma); +} + +VMManager::VMAIter VMManager::MergeAdjacent(VMAIter iter) { + VMAIter next_vma = std::next(iter); + if (next_vma != vma_map.end() && iter->second.CanBeMergedWith(next_vma->second)) { + iter->second.size += next_vma->second.size; + vma_map.erase(next_vma); + } + + if (iter != vma_map.begin()) { + VMAIter prev_vma = std::prev(iter); + if (prev_vma->second.CanBeMergedWith(iter->second)) { + prev_vma->second.size += iter->second.size; + vma_map.erase(iter); + iter = prev_vma; + } + } + + return iter; +} + +void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) { + switch (vma.type) { + case VMAType::Free: + Memory::UnmapRegion(vma.base, vma.size); + break; + case VMAType::AllocatedMemoryBlock: + Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_block->data() + vma.offset); + break; + case VMAType::BackingMemory: + Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_memory); + break; + case VMAType::MMIO: + // TODO(yuriks): Add support for MMIO handlers. + Memory::MapIoRegion(vma.base, vma.size); + break; + } +} + +} |