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DSP: Create backing memory for entire DSP RAM

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Also move address space mapping out of video_core.
This commit is contained in:
Yuri Kunde Schlesner 2017-04-30 21:36:00 -07:00
parent d3db770cad
commit b4a93cfdde
5 changed files with 42 additions and 32 deletions
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14
src/audio_core/hle/dsp.cpp
View file

@ -16,31 +16,33 @@ namespace HLE {
// Region management
std::array<SharedMemory, 2> g_regions;
DspMemory g_dsp_memory;
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.
u16 frame_counter_0 = g_dsp_memory.region_0.frame_counter;
u16 frame_counter_1 = g_dsp_memory.region_1.frame_counter;
if (g_regions[0].frame_counter == 0xFFFFu && g_regions[1].frame_counter != 0xFFFEu) {
if (frame_counter_0 == 0xFFFFu && frame_counter_1 != 0xFFFEu) {
// Wraparound has occurred.
return 1;
}
if (g_regions[1].frame_counter == 0xFFFFu && g_regions[0].frame_counter != 0xFFFEu) {
if (frame_counter_1 == 0xFFFFu && frame_counter_0 != 0xFFFEu) {
// Wraparound has occurred.
return 0;
}
return (g_regions[0].frame_counter > g_regions[1].frame_counter) ? 0 : 1;
return (frame_counter_0 > frame_counter_1) ? 0 : 1;
}
static SharedMemory& ReadRegion() {
return g_regions[CurrentRegionIndex()];
return CurrentRegionIndex() == 0 ? g_dsp_memory.region_0 : g_dsp_memory.region_1;
}
static SharedMemory& WriteRegion() {
return g_regions[1 - CurrentRegionIndex()];
return CurrentRegionIndex() != 0 ? g_dsp_memory.region_0 : g_dsp_memory.region_1;
}
// Audio processing and mixing

21
src/audio_core/hle/dsp.h
View file

@ -31,8 +31,8 @@ namespace HLE {
// double-buffer. The frame counter is located as the very last u16 of each region and is
// incremented each audio tick.
constexpr VAddr region0_base = 0x1FF50000;
constexpr VAddr region1_base = 0x1FF70000;
constexpr u32 region0_offset = 0x50000;
constexpr u32 region1_offset = 0x70000;
/**
* The DSP is native 16-bit. The DSP also appears to be big-endian. When reading 32-bit numbers from
@ -512,7 +512,22 @@ struct SharedMemory {
};
ASSERT_DSP_STRUCT(SharedMemory, 0x8000);
extern std::array<SharedMemory, 2> g_regions;
union DspMemory {
std::array<u8, 0x80000> raw_memory;
struct {
u8 unused_0[0x50000];
SharedMemory region_0;
u8 unused_1[0x18000];
SharedMemory region_1;
u8 unused_2[0x8000];
};
};
static_assert(offsetof(DspMemory, region_0) == region0_offset,
"DSP region 0 is at the wrong offset");
static_assert(offsetof(DspMemory, region_1) == region1_offset,
"DSP region 1 is at the wrong offset");
extern DspMemory g_dsp_memory;
// Structures must have an offset that is a multiple of two.
static_assert(offsetof(SharedMemory, frame_counter) % 2 == 0,