From 1bd0cf542ff8db1cda572c4d92462643296af121 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sun, 17 Apr 2016 21:07:52 -0500
Subject: Kernel/SharedMemory: Properly implemented shared memory support.

Applications can request the kernel to allocate a piece of the linear heap for them when creating a shared memory object.
Shared memory areas are now properly mapped into the target processes when calling svcMapMemoryBlock.

Removed the APT Shared Font hack as it is no longer needed.
---
 src/core/hle/kernel/shared_memory.h | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

(limited to 'src/core/hle/kernel/shared_memory.h')

diff --git a/src/core/hle/kernel/shared_memory.h b/src/core/hle/kernel/shared_memory.h
index b51049ad0..b442cb764 100644
--- a/src/core/hle/kernel/shared_memory.h
+++ b/src/core/hle/kernel/shared_memory.h
@@ -9,6 +9,7 @@
 #include "common/common_types.h"
 
 #include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/process.h"
 #include "core/hle/result.h"
 
 namespace Kernel {
@@ -30,13 +31,16 @@ class SharedMemory final : public Object {
 public:
     /**
      * Creates a shared memory object
+     * @param owner_process Process that created this shared memory object.
      * @param size Size of the memory block. Must be page-aligned.
      * @param permissions Permission restrictions applied to the process which created the block.
      * @param other_permissions Permission restrictions applied to other processes mapping the block.
+     * @param address The address from which to map the Shared Memory.
+     * @param region If the address is 0, the shared memory will be allocated in this region of the linear heap.
      * @param name Optional object name, used for debugging purposes.
      */
-    static SharedPtr<SharedMemory> Create(u32 size, MemoryPermission permissions,
-            MemoryPermission other_permissions, std::string name = "Unknown");
+    static SharedPtr<SharedMemory> Create(SharedPtr<Process> owner_process, u32 size, MemoryPermission permissions,
+            MemoryPermission other_permissions, VAddr address = 0, MemoryRegion region = MemoryRegion::BASE, std::string name = "Unknown");
 
     std::string GetTypeName() const override { return "SharedMemory"; }
     std::string GetName() const override { return name; }
@@ -45,19 +49,21 @@ public:
     HandleType GetHandleType() const override { return HANDLE_TYPE; }
 
     /**
-     * Maps a shared memory block to an address in system memory
+     * Maps a shared memory block to an address in the target process' address space
+     * @param target_process Process on which to map the memory block.
      * @param address Address in system memory to map shared memory block to
      * @param permissions Memory block map permissions (specified by SVC field)
      * @param other_permissions Memory block map other permissions (specified by SVC field)
      */
-    ResultCode Map(VAddr address, MemoryPermission permissions, MemoryPermission other_permissions);
+    ResultCode Map(Process* target_process, VAddr address, MemoryPermission permissions, MemoryPermission other_permissions);
 
     /**
      * Unmaps a shared memory block from the specified address in system memory
+     * @param target_process Process from which to umap the memory block.
      * @param address Address in system memory where the shared memory block is mapped
      * @return Result code of the unmap operation
      */
-    ResultCode Unmap(VAddr address);
+    ResultCode Unmap(Process* target_process, VAddr address);
 
     /**
     * Gets a pointer to the shared memory block
@@ -66,10 +72,16 @@ public:
     */
     u8* GetPointer(u32 offset = 0);
 
-    /// Address of shared memory block in the process.
+    /// Process that created this shared memory block.
+    SharedPtr<Process> owner_process;
+    /// Address of shared memory block in the owner process if specified.
     VAddr base_address;
-    /// Fixed address to allow mapping to. Used for blocks created from the linear heap.
-    VAddr fixed_address;
+    /// Physical address of the shared memory block in the linear heap if no address was specified during creation.
+    PAddr linear_heap_phys_address;
+    /// Backing memory for this shared memory block.
+    std::shared_ptr<std::vector<u8>> backing_block;
+    /// Offset into the backing block for this shared memory.
+    u32 backing_block_offset;
     /// Size of the memory block. Page-aligned.
     u32 size;
     /// Permission restrictions applied to the process which created the block.
-- 
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