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Bus: Fix RAM mirrors with LUT fastmem

This commit is contained in:
Stenzek 2023-09-30 23:14:06 +10:00
parent 31052581d3
commit 2171fd9a6f
1 changed files with 16 additions and 17 deletions
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33
src/core/bus.cpp
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@ -138,6 +138,7 @@ static std::tuple<TickCount, TickCount, TickCount> CalculateMemoryTiming(MEMDELA
static void RecalculateMemoryTimings();
static void SetCodePageFastmemProtection(u32 page_index, bool writable);
static void SetLUTFastmemProtection(u32 page_index, bool writable);
} // namespace Bus
#define FIXUP_HALFWORD_OFFSET(size, offset) ((size >= MemoryAccessSize::HalfWord) ? (offset) : ((offset) & ~1u))
@ -460,12 +461,13 @@ void Bus::UpdateFastmemViews(CPUFastmemMode mode)
std::memset(s_fastmem_lut, 0, sizeof(u8*) * FASTMEM_LUT_NUM_SLOTS);
auto MapRAM = [](u32 base_address) {
u8* ram_ptr = g_ram;
u8* ram_ptr = g_ram + (base_address & g_ram_mask);
for (u32 address = 0; address < g_ram_size; address += FASTMEM_LUT_PAGE_SIZE)
{
const u32 lut_index = (base_address + address) >> FASTMEM_LUT_PAGE_SHIFT;
s_fastmem_lut[lut_index] = ram_ptr;
s_fastmem_lut[FASTMEM_LUT_NUM_PAGES + lut_index] = g_ram_code_bits[address >> HOST_PAGE_SHIFT] ? nullptr : ram_ptr;
s_fastmem_lut[FASTMEM_LUT_NUM_PAGES + lut_index] =
g_ram_code_bits[address >> HOST_PAGE_SHIFT] ? nullptr : ram_ptr;
ram_ptr += FASTMEM_LUT_PAGE_SIZE;
}
};
@ -564,16 +566,16 @@ void Bus::SetCodePageFastmemProtection(u32 page_index, bool writable)
{
// mirrors...
const u32 code_addr = page_index << HOST_PAGE_SHIFT;
u8* code_ptr = &g_ram[code_addr];
for (u32 mirror_start : s_fastmem_ram_mirrors)
{
u32 ram_offset = code_addr;
u8* ram_ptr = code_ptr;
for (u32 i = 0; i < FASTMEM_LUT_PAGES_PER_CODE_PAGE; i++)
u32 lut_addr = mirror_start + code_addr;
u32 ram_offset = (lut_addr & g_ram_mask);
for (u32 j = 0; j < FASTMEM_LUT_PAGES_PER_CODE_PAGE; j++)
{
s_fastmem_lut[FASTMEM_LUT_NUM_PAGES + ((mirror_start + ram_offset) >> FASTMEM_LUT_PAGE_SHIFT)] = ram_ptr;
s_fastmem_lut[FASTMEM_LUT_NUM_PAGES + (lut_addr >> FASTMEM_LUT_PAGE_SHIFT)] =
writable ? &g_ram[ram_offset] : nullptr;
lut_addr += FASTMEM_LUT_PAGE_SIZE;
ram_offset += FASTMEM_LUT_PAGE_SIZE;
ram_ptr += FASTMEM_LUT_PAGE_SIZE;
}
}
}
@ -601,16 +603,13 @@ void Bus::ClearRAMCodePageFlags()
{
for (u32 i = 0; i < static_cast<u32>(g_ram_code_bits.size()); i++)
{
const u32 code_addr = (i * HOST_PAGE_SIZE);
for (u32 mirror_start : s_fastmem_ram_mirrors)
u32 lut_addr = (i * HOST_PAGE_SIZE);
u32 ram_offset = (lut_addr & g_ram_mask);
for (u32 j = 0; j < FASTMEM_LUT_PAGES_PER_CODE_PAGE; j++)
{
u32 ram_offset = code_addr;
for (u32 j = 0; j < FASTMEM_LUT_PAGES_PER_CODE_PAGE; j++)
{
s_fastmem_lut[FASTMEM_LUT_NUM_PAGES + ((mirror_start + ram_offset) >> FASTMEM_LUT_PAGE_SHIFT)] =
&g_ram[ram_offset];
ram_offset += FASTMEM_LUT_PAGE_SIZE;
}
s_fastmem_lut[FASTMEM_LUT_NUM_PAGES + (lut_addr >> FASTMEM_LUT_PAGE_SHIFT)] = &g_ram[ram_offset];
lut_addr += FASTMEM_LUT_PAGE_SIZE;
ram_offset += FASTMEM_LUT_PAGE_SIZE;
}
}
}