CPU: Use partial icache fills for non-line-aligned addresses
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@ -1006,11 +1006,12 @@ TickCount GetICacheFillTicks(VirtualMemoryAddress address)
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if (address < RAM_MIRROR_END)
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{
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return 1 * (ICACHE_LINE_SIZE / sizeof(u32));
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return 1 * ((ICACHE_LINE_SIZE - (address & (ICACHE_LINE_SIZE - 1))) / sizeof(u32));
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}
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else if (address >= BIOS_BASE && address < (BIOS_BASE + BIOS_SIZE))
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{
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return m_bios_access_time[static_cast<u32>(MemoryAccessSize::Word)] * (ICACHE_LINE_SIZE / sizeof(u32));
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return m_bios_access_time[static_cast<u32>(MemoryAccessSize::Word)] *
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((ICACHE_LINE_SIZE - (address & (ICACHE_LINE_SIZE - 1))) / sizeof(u32));
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}
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else
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{
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@ -1046,9 +1047,29 @@ void CheckAndUpdateICacheTags(u32 line_count, TickCount uncached_ticks)
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u32 FillICache(VirtualMemoryAddress address)
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{
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const u32 line = GetICacheLine(address);
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g_state.icache_tags[line] = GetICacheTagForAddress(address);
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u8* line_data = &g_state.icache_data[line * ICACHE_LINE_SIZE];
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DoInstructionRead<true, true, 4>(address & ~(ICACHE_LINE_SIZE - 1u), line_data);
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u32 line_tag;
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switch ((address >> 2) & 0x03u)
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{
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case 0:
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DoInstructionRead<true, true, 4>(address & ~(ICACHE_LINE_SIZE - 1u), line_data);
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line_tag = GetICacheTagForAddress(address);
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break;
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case 1:
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DoInstructionRead<true, true, 3>(address & (~(ICACHE_LINE_SIZE - 1u) | 0x4), line_data + 0x4);
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line_tag = GetICacheTagForAddress(address) | 0x1;
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break;
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case 2:
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DoInstructionRead<true, true, 2>(address & (~(ICACHE_LINE_SIZE - 1u) | 0x8), line_data + 0x8);
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line_tag = GetICacheTagForAddress(address) | 0x3;
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break;
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case 3:
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default:
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DoInstructionRead<true, true, 1>(address & (~(ICACHE_LINE_SIZE - 1u) | 0xC), line_data + 0xC);
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line_tag = GetICacheTagForAddress(address) | 0x7;
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break;
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}
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g_state.icache_tags[line] = line_tag;
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const u32 offset = GetICacheLineOffset(address);
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u32 result;
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@ -1059,7 +1080,7 @@ u32 FillICache(VirtualMemoryAddress address)
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void ClearICache()
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{
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std::memset(g_state.icache_data.data(), 0, ICACHE_SIZE);
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g_state.icache_tags.fill(ICACHE_INVALD_BIT | ICACHE_DISABLED_BIT);
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g_state.icache_tags.fill(ICACHE_INVALID_BITS);
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}
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ALWAYS_INLINE_RELEASE static u32 ReadICache(VirtualMemoryAddress address)
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@ -1076,7 +1097,7 @@ ALWAYS_INLINE_RELEASE static void WriteICache(VirtualMemoryAddress address, u32
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{
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const u32 line = GetICacheLine(address);
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const u32 offset = GetICacheLineOffset(address);
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g_state.icache_tags[line] = GetICacheTagForAddress(address) | ICACHE_INVALD_BIT;
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g_state.icache_tags[line] = GetICacheTagForAddress(address) | ICACHE_INVALID_BITS;
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std::memcpy(&g_state.icache_data[line * ICACHE_LINE_SIZE + offset], &value, sizeof(value));
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}
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@ -1086,19 +1107,6 @@ static void WriteCacheControl(u32 value)
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CacheControl changed_bits{g_state.cache_control.bits ^ value};
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g_state.cache_control.bits = value;
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if (changed_bits.icache_enable)
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{
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if (g_state.cache_control.icache_enable)
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{
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for (u32 i = 0; i < ICACHE_LINES; i++)
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g_state.icache_tags[i] &= ~ICACHE_DISABLED_BIT;
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}
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else
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{
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for (u32 i = 0; i < ICACHE_LINES; i++)
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g_state.icache_tags[i] |= ICACHE_DISABLED_BIT;
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}
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}
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}
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template<MemoryAccessType type, MemoryAccessSize size>
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@ -1323,15 +1331,12 @@ bool FetchInstruction()
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case 0x04: // KSEG0 - physical memory cached
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{
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#if 0
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// TODO: icache
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TickCount cycles;
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DoInstructionRead(address, cycles, g_state.next_instruction.bits);
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DoInstructionRead<true, false, 1>(address, &g_state.next_instruction.bits);
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#else
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if (CompareICacheTag(address))
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g_state.next_instruction.bits = ReadICache(address);
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else
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g_state.next_instruction.bits = FillICache(address);
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#endif
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}
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break;
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@ -490,7 +490,6 @@ bool CompileBlock(CodeBlock* block)
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if (icache_line != last_cache_line)
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{
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block->icache_line_count++;
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block->icache_line_count = GetICacheFillTicks(pc);
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last_cache_line = icache_line;
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}
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block->uncached_fetch_ticks += GetInstructionReadTicks(pc);
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@ -25,13 +25,8 @@ enum : PhysicalMemoryAddress
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ICACHE_LINE_SIZE = 16,
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ICACHE_LINES = ICACHE_SIZE / ICACHE_LINE_SIZE,
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ICACHE_SLOTS_PER_LINE = ICACHE_SLOTS / ICACHE_LINES,
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ICACHE_TAG_ADDRESS_MASK = 0xFFFFFFF0u
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};
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enum : u32
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{
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ICACHE_DISABLED_BIT = 0x01,
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ICACHE_INVALD_BIT = 0x02,
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ICACHE_TAG_ADDRESS_MASK = 0xFFFFFFF0u,
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ICACHE_INVALID_BITS = 0x0Fu,
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};
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union CacheControl
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@ -1,6 +1,6 @@
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#pragma once
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#include "cpu_core.h"
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#include "bus.h"
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#include "cpu_core.h"
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namespace CPU {
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@ -11,7 +11,7 @@ void RaiseException(u32 CAUSE_bits, u32 EPC);
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ALWAYS_INLINE bool HasPendingInterrupt()
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{
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return g_state.cop0_regs.sr.IEc &&
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(((g_state.cop0_regs.cause.bits & g_state.cop0_regs.sr.bits) & (UINT32_C(0xFF) << 8)) != 0);
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(((g_state.cop0_regs.cause.bits & g_state.cop0_regs.sr.bits) & (UINT32_C(0xFF) << 8)) != 0);
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}
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ALWAYS_INLINE void CheckForPendingInterrupt()
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@ -40,10 +40,23 @@ ALWAYS_INLINE u32 GetICacheTagForAddress(VirtualMemoryAddress address)
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{
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return (address & ICACHE_TAG_ADDRESS_MASK);
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}
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ALWAYS_INLINE u32 GetICacheFillTagForAddress(VirtualMemoryAddress address)
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{
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static const u32 invalid_bits[4] = {0, 1, 3, 7};
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return GetICacheTagForAddress(address) | invalid_bits[(address >> 2) & 0x03u];
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}
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ALWAYS_INLINE u32 GetICacheTagMaskForAddress(VirtualMemoryAddress address)
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{
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const u32 offset = (address >> 2) & 0x03u;
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static const u32 mask[4] = {ICACHE_TAG_ADDRESS_MASK | 1, ICACHE_TAG_ADDRESS_MASK | 2, ICACHE_TAG_ADDRESS_MASK | 4,
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ICACHE_TAG_ADDRESS_MASK | 8};
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return mask[(address >> 2) & 0x03u];
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}
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ALWAYS_INLINE bool CompareICacheTag(VirtualMemoryAddress address)
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{
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const u32 line = GetICacheLine(address);
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return (g_state.icache_tags[line] == GetICacheTagForAddress(address));
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return ((g_state.icache_tags[line] & GetICacheTagMaskForAddress(address)) == GetICacheTagForAddress(address));
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}
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TickCount GetInstructionReadTicks(VirtualMemoryAddress address);
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