process: Add method to mirror a memory region.

This commit is contained in:
bunnei 2017-12-28 21:35:49 -05:00
parent 7618b5237d
commit 3421e1617e
2 changed files with 27 additions and 0 deletions

View file

@ -267,6 +267,31 @@ ResultCode Process::LinearFree(VAddr target, u32 size) {
return RESULT_SUCCESS; return RESULT_SUCCESS;
} }
ResultCode Process::MirrorMemory(VAddr dst_addr, VAddr src_addr, u64 size) {
auto vma = vm_manager.FindVMA(src_addr);
ASSERT_MSG(vma != vm_manager.vma_map.end(), "Invalid memory address");
ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
// The returned VMA might be a bigger one encompassing the desired address.
auto vma_offset = src_addr - vma->first;
ASSERT_MSG(vma_offset + size <= vma->second.size,
"Shared memory exceeds bounds of mapped block");
const std::shared_ptr<std::vector<u8>>& backing_block = vma->second.backing_block;
size_t backing_block_offset = vma->second.offset + vma_offset;
CASCADE_RESULT(auto new_vma,
vm_manager.MapMemoryBlock(dst_addr, backing_block, backing_block_offset, size,
vma->second.meminfo_state));
// Protect mirror with permissions from old region
vm_manager.Reprotect(new_vma, vma->second.permissions);
// Remove permissions from old region
vm_manager.Reprotect(vma, VMAPermission::None);
return RESULT_SUCCESS;
}
Kernel::Process::Process() {} Kernel::Process::Process() {}
Kernel::Process::~Process() {} Kernel::Process::~Process() {}

View file

@ -177,6 +177,8 @@ public:
ResultVal<VAddr> LinearAllocate(VAddr target, u32 size, VMAPermission perms); ResultVal<VAddr> LinearAllocate(VAddr target, u32 size, VMAPermission perms);
ResultCode LinearFree(VAddr target, u32 size); ResultCode LinearFree(VAddr target, u32 size);
ResultCode MirrorMemory(VAddr dst_addr, VAddr src_addr, u64 size);
private: private:
Process(); Process();
~Process() override; ~Process() override;