From 31d49e01094068519850bbfa414f314fdb27beee Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Sat, 16 Apr 2016 15:22:45 +0100
Subject: [PATCH] Memory: CopyBlock

---
 src/core/memory.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
 src/core/memory.h   |  4 ++--
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/src/core/memory.cpp b/src/core/memory.cpp
index 1604a7da5..bf2493270 100644
--- a/src/core/memory.cpp
+++ b/src/core/memory.cpp
@@ -495,6 +495,47 @@ void ZeroBlock(const VAddr dest_addr, const size_t size) {
     }
 }
 
+void CopyBlock(VAddr dest_addr, VAddr src_addr, const size_t size) {
+    size_t remaining_size = size;
+    size_t page_index = src_addr >> PAGE_BITS;
+    size_t page_offset = src_addr & PAGE_MASK;
+
+    while (remaining_size > 0) {
+        const size_t copy_amount = std::min(PAGE_SIZE - page_offset, remaining_size);
+        const VAddr current_vaddr = (page_index << PAGE_BITS) + page_offset;
+
+        switch (current_page_table->attributes[page_index]) {
+        case PageType::Unmapped: {
+            LOG_ERROR(HW_Memory, "unmapped CopyBlock @ 0x%08X (start address = 0x%08X, size = %zu)", current_vaddr, src_addr, size);
+            ZeroBlock(dest_addr, copy_amount);
+            break;
+        }
+        case PageType::Memory: {
+            DEBUG_ASSERT(current_page_table->pointers[page_index]);
+            const u8* src_ptr = current_page_table->pointers[page_index] + page_offset;
+            WriteBlock(dest_addr, src_ptr, copy_amount);
+            break;
+        }
+        case PageType::Special: {
+            DEBUG_ASSERT(GetMMIOHandler(current_vaddr));
+
+            std::vector<u8> buffer(copy_amount);
+            GetMMIOHandler(current_vaddr)->ReadBlock(current_vaddr, buffer.data(), buffer.size());
+            WriteBlock(dest_addr, buffer.data(), buffer.size());
+            break;
+        }
+        default:
+            UNREACHABLE();
+        }
+
+        page_index++;
+        page_offset = 0;
+        dest_addr += copy_amount;
+        src_addr += copy_amount;
+        remaining_size -= copy_amount;
+    }
+}
+
 template<>
 u8 ReadMMIO<u8>(MMIORegionPointer mmio_handler, VAddr addr) {
     return mmio_handler->Read8(addr);
diff --git a/src/core/memory.h b/src/core/memory.h
index 713cdfb2f..bb5dd0d15 100644
--- a/src/core/memory.h
+++ b/src/core/memory.h
@@ -118,15 +118,15 @@ u16 Read16(VAddr addr);
 u32 Read32(VAddr addr);
 u64 Read64(VAddr addr);
 
-void ReadBlock(const VAddr src_addr, u8* dest_buffer, size_t size);
-
 void Write8(VAddr addr, u8 data);
 void Write16(VAddr addr, u16 data);
 void Write32(VAddr addr, u32 data);
 void Write64(VAddr addr, u64 data);
 
+void ReadBlock(const VAddr src_addr, u8* dest_buffer, size_t size);
 void WriteBlock(const VAddr dest_addr, const u8* src_buffer, size_t size);
 void ZeroBlock(const VAddr dest_addr, const size_t size);
+void CopyBlock(VAddr dest_addr, VAddr src_addr, size_t size);
 
 u8* GetPointer(VAddr virtual_address);