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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "video_core/memory_manager.h"
namespace Tegra {
PAddr MemoryManager::AllocateSpace(u64 size, u64 align) {
boost::optional<PAddr> paddr = FindFreeBlock(size, align);
ASSERT(paddr);
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
PageSlot(*paddr + offset) = static_cast<u64>(PageStatus::Allocated);
}
return *paddr;
}
PAddr MemoryManager::AllocateSpace(PAddr paddr, u64 size, u64 align) {
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
if (IsPageMapped(paddr + offset)) {
return AllocateSpace(size, align);
}
}
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
PageSlot(paddr + offset) = static_cast<u64>(PageStatus::Allocated);
}
return paddr;
}
PAddr MemoryManager::MapBufferEx(VAddr vaddr, u64 size) {
vaddr &= ~Memory::PAGE_MASK;
boost::optional<PAddr> paddr = FindFreeBlock(size);
ASSERT(paddr);
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
PageSlot(*paddr + offset) = vaddr + offset;
}
return *paddr;
}
PAddr MemoryManager::MapBufferEx(VAddr vaddr, PAddr paddr, u64 size) {
vaddr &= ~Memory::PAGE_MASK;
paddr &= ~Memory::PAGE_MASK;
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
if (PageSlot(paddr + offset) != static_cast<u64>(PageStatus::Allocated)) {
return MapBufferEx(vaddr, size);
}
}
for (u64 offset = 0; offset < size; offset += Memory::PAGE_SIZE) {
PageSlot(paddr + offset) = vaddr + offset;
}
return paddr;
}
boost::optional<PAddr> MemoryManager::FindFreeBlock(u64 size, u64 align) {
PAddr paddr{};
u64 free_space{};
align = (align + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
while (paddr + free_space < MAX_ADDRESS) {
if (!IsPageMapped(paddr + free_space)) {
free_space += Memory::PAGE_SIZE;
if (free_space >= size) {
return paddr;
}
} else {
paddr += free_space + Memory::PAGE_SIZE;
free_space = 0;
const u64 remainder{paddr % align};
if (!remainder) {
paddr = (paddr - remainder) + align;
}
}
}
return {};
}
VAddr MemoryManager::PhysicalToVirtualAddress(PAddr paddr) {
VAddr base_addr = PageSlot(paddr);
ASSERT(base_addr != static_cast<u64>(PageStatus::Unmapped));
return base_addr + (paddr & Memory::PAGE_MASK);
}
bool MemoryManager::IsPageMapped(PAddr paddr) {
return PageSlot(paddr) != static_cast<u64>(PageStatus::Unmapped);
}
VAddr& MemoryManager::PageSlot(PAddr paddr) {
auto& block = page_table[(paddr >> (Memory::PAGE_BITS + PAGE_TABLE_BITS)) & PAGE_TABLE_MASK];
if (!block) {
block = std::make_unique<PageBlock>();
for (unsigned index = 0; index < PAGE_BLOCK_SIZE; index++) {
(*block)[index] = static_cast<u64>(PageStatus::Unmapped);
}
}
return (*block)[(paddr >> Memory::PAGE_BITS) & PAGE_BLOCK_MASK];
}
} // namespace Tegra
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