u32 VirtualMemoryBlock::Map(u32 realaddr, u32 size)
{
assert(size);
for (u32 addr = GetStartAddr(); addr <= GetEndAddr() - GetReservedAmount() - size;)
{
bool is_good_addr = true;
// check if address is already mapped
for (u32 i = 0; i<m_mapped_memory.size(); ++i)
{
if ((addr >= m_mapped_memory[i].addr && addr < m_mapped_memory[i].addr + m_mapped_memory[i].size) ||
(m_mapped_memory[i].addr >= addr && m_mapped_memory[i].addr < addr + size))
{
is_good_addr = false;
addr = m_mapped_memory[i].addr + m_mapped_memory[i].size;
break;
}
}
if (!is_good_addr) continue;
m_mapped_memory.emplace_back(addr, realaddr, size);
return addr;
}
return 0;
}
bool VirtualMemoryBlock::Reserve(u32 size)
{
if(size + GetReservedAmount() > GetEndAddr() - GetStartAddr())
return false;
m_reserve_size += size;
return true;
}
u64 VirtualMemoryBlock::Map(u64 realaddr, u32 size, u64 addr)
{
if(addr)
{
if(!IsInMyRange(addr, size) && (IsMyAddress(addr) || IsMyAddress(addr + size - 1)))
return 0;
m_mapped_memory.emplace_back(addr, realaddr, size);
return addr;
}
else
{
for(u64 addr = GetStartAddr(); addr <= GetEndAddr() - GetReservedAmount() - size;)
{
bool is_good_addr = true;
// check if address is already mapped
for(u32 i=0; i<m_mapped_memory.size(); ++i)
{
if((addr >= m_mapped_memory[i].addr && addr < m_mapped_memory[i].addr + m_mapped_memory[i].size) ||
(m_mapped_memory[i].addr >= addr && m_mapped_memory[i].addr < addr + size))
{
is_good_addr = false;
addr = m_mapped_memory[i].addr + m_mapped_memory[i].size;
break;
}
}
if(!is_good_addr) continue;
m_mapped_memory.emplace_back(addr, realaddr, size);
return addr;
}
return 0;
}
}
bool MemoryBlock::IsMyAddress(const u64 addr)
{
return mem && addr >= GetStartAddr() && addr < GetEndAddr();
}
bool VirtualMemoryBlock::IsInMyRange(const u32 addr, const u32 size)
{
return addr >= GetStartAddr() && addr + size - 1 <= GetEndAddr() - GetReservedAmount();
}