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Merge pull request #1726 from MerryMage/read-write-region

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AudioCore: CurrentRegion() -> ReadRegion(), WriteRegion()
This commit is contained in:
bunnei 2016-04-29 12:18:26 -04:00
commit 73624b4721
3 changed files with 31 additions and 26 deletions
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4
src/audio_core/audio_core.cpp
View file

@ -38,10 +38,10 @@ void Init() {
/// Add DSP address spaces to Process's address space.
void AddAddressSpace(Kernel::VMManager& address_space) {
auto r0_vma = address_space.MapBackingMemory(DSP::HLE::region0_base, reinterpret_cast<u8*>(&DSP::HLE::g_region0), sizeof(DSP::HLE::SharedMemory), Kernel::MemoryState::IO).MoveFrom();
auto r0_vma = address_space.MapBackingMemory(DSP::HLE::region0_base, reinterpret_cast<u8*>(&DSP::HLE::g_regions[0]), sizeof(DSP::HLE::SharedMemory), Kernel::MemoryState::IO).MoveFrom();
address_space.Reprotect(r0_vma, Kernel::VMAPermission::ReadWrite);
auto r1_vma = address_space.MapBackingMemory(DSP::HLE::region1_base, reinterpret_cast<u8*>(&DSP::HLE::g_region1), sizeof(DSP::HLE::SharedMemory), Kernel::MemoryState::IO).MoveFrom();
auto r1_vma = address_space.MapBackingMemory(DSP::HLE::region1_base, reinterpret_cast<u8*>(&DSP::HLE::g_regions[1]), sizeof(DSP::HLE::SharedMemory), Kernel::MemoryState::IO).MoveFrom();
address_space.Reprotect(r1_vma, Kernel::VMAPermission::ReadWrite);
}

44
src/audio_core/hle/dsp.cpp
View file

@ -8,8 +8,32 @@
namespace DSP {
namespace HLE {
SharedMemory g_region0;
SharedMemory g_region1;
std::array<SharedMemory, 2> g_regions;
static size_t CurrentRegionIndex() {
// The region with the higher frame counter is chosen unless there is wraparound.
// This function only returns a 0 or 1.
if (g_regions[0].frame_counter == 0xFFFFu && g_regions[1].frame_counter != 0xFFFEu) {
// Wraparound has occured.
return 1;
}
if (g_regions[1].frame_counter == 0xFFFFu && g_regions[0].frame_counter != 0xFFFEu) {
// Wraparound has occured.
return 0;
}
return (g_regions[0].frame_counter > g_regions[1].frame_counter) ? 0 : 1;
}
static SharedMemory& ReadRegion() {
return g_regions[CurrentRegionIndex()];
}
static SharedMemory& WriteRegion() {
return g_regions[1 - CurrentRegionIndex()];
}
void Init() {
DSP::HLE::ResetPipes();
@ -22,21 +46,5 @@ bool Tick() {
return true;
}
SharedMemory& CurrentRegion() {
// The region with the higher frame counter is chosen unless there is wraparound.
if (g_region0.frame_counter == 0xFFFFu && g_region1.frame_counter != 0xFFFEu) {
// Wraparound has occured.
return g_region1;
}
if (g_region1.frame_counter == 0xFFFFu && g_region0.frame_counter != 0xFFFEu) {
// Wraparound has occured.
return g_region0;
}
return (g_region0.frame_counter > g_region1.frame_counter) ? g_region0 : g_region1;
}
} // namespace HLE
} // namespace DSP

9
src/audio_core/hle/dsp.h
View file

@ -4,6 +4,7 @@
#pragma once
#include <array>
#include <cstddef>
#include <type_traits>
@ -30,10 +31,9 @@ namespace HLE {
struct SharedMemory;
constexpr VAddr region0_base = 0x1FF50000;
extern SharedMemory g_region0;
constexpr VAddr region1_base = 0x1FF70000;
extern SharedMemory g_region1;
extern std::array<SharedMemory, 2> g_regions;
/**
* The DSP is native 16-bit. The DSP also appears to be big-endian. When reading 32-bit numbers from
@ -535,8 +535,5 @@ void Shutdown();
*/
bool Tick();
/// Returns a mutable reference to the current region. Current region is selected based on the frame counter.
SharedMemory& CurrentRegion();
} // namespace HLE
} // namespace DSP