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Diffstat (limited to 'source/sa1.c')
-rw-r--r--source/sa1.c179
1 files changed, 108 insertions, 71 deletions
diff --git a/source/sa1.c b/source/sa1.c
index 005a9c7..1666e17 100644
--- a/source/sa1.c
+++ b/source/sa1.c
@@ -277,31 +277,39 @@ uint8_t S9xGetSA1(uint32_t address)
{
switch (address)
{
- case 0x2300:
- return (uint8_t)((Memory.FillRAM [0x2209] & 0x5f) | (CPU.IRQActive & (SA1_IRQ_SOURCE | SA1_DMA_IRQ_SOURCE)));
- case 0x2301:
- return (Memory.FillRAM [0x2200] & 0xf) | (Memory.FillRAM [0x2301] & 0xf0);
- case 0x2306:
- return (uint8_t) SA1.sum;
- case 0x2307:
- return (uint8_t) (SA1.sum >> 8);
- case 0x2308:
- return (uint8_t) (SA1.sum >> 16);
- case 0x2309:
- return (uint8_t) (SA1.sum >> 24);
- case 0x230a:
- return (uint8_t) (SA1.sum >> 32);
- case 0x230d:
- {
- uint8_t byte = Memory.FillRAM [0x230d];
+ case 0x2300:
+ return (Memory.FillRAM[0x2209] & 0x5f) | (Memory.FillRAM[0x2300] & 0xa0);
+ case 0x2301:
+ return (Memory.FillRAM[0x2200] & 0x0f) | (Memory.FillRAM[0x2301] & 0xf0);
+ case 0x2306:
+ return (uint8_t) SA1.sum;
+ case 0x2307:
+ return (uint8_t) (SA1.sum >> 8);
+ case 0x2308:
+ return (uint8_t) (SA1.sum >> 16);
+ case 0x2309:
+ return (uint8_t) (SA1.sum >> 24);
+ case 0x230a:
+ return (uint8_t) (SA1.sum >> 32);
+ case 0x230b:
+ return SA1.overflow ? 0x80 : 0;
+ case 0x230c:
+ return Memory.FillRAM[0x230c];
+ case 0x230d:
+ {
+ uint8_t byte = Memory.FillRAM[0x230d];
- if (Memory.FillRAM [0x2258] & 0x80)
- S9xSA1ReadVariableLengthData(true, false);
- return byte;
- }
+ if (Memory.FillRAM[0x2258] & 0x80)
+ S9xSA1ReadVariableLengthData(true, false);
+ return byte;
+ }
+ case 0x230e: /* version code register */
+ return 0x01;
+ default:
+ break;
}
- return Memory.FillRAM [address];
+ return Memory.FillRAM[address];
}
void S9xSetSA1(uint8_t byte, uint32_t address)
@@ -314,26 +322,37 @@ void S9xSetSA1(uint8_t byte, uint32_t address)
case 0x2200:
SA1.Waiting = (byte & 0x60) != 0;
- if (!(byte & 0x20) && (Memory.FillRAM [0x2200] & 0x20))
+ if (!(byte & 0x80) && (Memory.FillRAM[0x2200] & 0x20))
S9xSA1Reset();
if (byte & 0x80)
{
- Memory.FillRAM [0x2301] |= 0x80;
- if (Memory.FillRAM [0x220a] & 0x80)
+ Memory.FillRAM[0x2301] |= 0x80;
+ if (Memory.FillRAM[0x220a] & 0x80)
{
+ Memory.FillRAM[0x220b] &= ~0x80;
SA1.Flags |= IRQ_PENDING_FLAG;
SA1.IRQActive |= SNES_IRQ_SOURCE;
SA1.Executing = !SA1.Waiting && SA1.S9xOpcodes;
}
}
if (byte & 0x10)
- Memory.FillRAM [0x2301] |= 0x10;
+ {
+ Memory.FillRAM[0x2301] |= 0x10;
+ if (Memory.FillRAM[0x220a] & 0x10)
+ Memory.FillRAM[0x220b] &= ~0x10;
+ }
break;
case 0x2201:
- if (((byte ^ Memory.FillRAM [0x2201]) & 0x80) && (Memory.FillRAM [0x2300] & byte & 0x80))
+ if (((byte ^ Memory.FillRAM[0x2201]) & 0x80) && (Memory.FillRAM[0x2300] & byte & 0x80))
+ {
+ Memory.FillRAM[0x2202] &= ~0x80;
S9xSetIRQ(SA1_IRQ_SOURCE);
- if (((byte ^ Memory.FillRAM [0x2201]) & 0x20) && (Memory.FillRAM [0x2300] & byte & 0x20))
+ }
+ if (((byte ^ Memory.FillRAM[0x2201]) & 0x20) && (Memory.FillRAM[0x2300] & byte & 0x20))
+ {
+ Memory.FillRAM[0x2202] &= ~0x20;
S9xSetIRQ(SA1_DMA_IRQ_SOURCE);
+ }
break;
case 0x2202:
if (byte & 0x80)
@@ -348,29 +367,37 @@ void S9xSetSA1(uint8_t byte, uint32_t address)
}
break;
case 0x2209:
- Memory.FillRAM [0x2209] = byte;
if (byte & 0x80)
- Memory.FillRAM [0x2300] |= 0x80;
-
- if (byte & Memory.FillRAM [0x2201] & 0x80)
- S9xSetIRQ(SA1_IRQ_SOURCE);
- return;
+ {
+ Memory.FillRAM[0x2300] |= 0x80;
+ if (Memory.FillRAM[0x2201] & 0x80)
+ {
+ Memory.FillRAM[0x2202] &= ~0x80;
+ S9xSetIRQ(SA1_IRQ_SOURCE);
+ }
+ }
+ break;
case 0x220a:
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x80) && (Memory.FillRAM [0x2301] & byte & 0x80))
+ if (((byte ^ Memory.FillRAM[0x220a]) & 0x80) && (Memory.FillRAM[0x2301] & byte & 0x80))
{
+ Memory.FillRAM[0x220b] &= ~0x80;
SA1.Flags |= IRQ_PENDING_FLAG;
SA1.IRQActive |= SNES_IRQ_SOURCE;
}
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x40) && (Memory.FillRAM [0x2301] & byte & 0x40))
+ if (((byte ^ Memory.FillRAM[0x220a]) & 0x40) && (Memory.FillRAM[0x2301] & byte & 0x40))
{
+ Memory.FillRAM[0x220b] &= ~0x40;
SA1.Flags |= IRQ_PENDING_FLAG;
SA1.IRQActive |= TIMER_IRQ_SOURCE;
}
- if (((byte ^ Memory.FillRAM [0x220a]) & 0x20) && (Memory.FillRAM [0x2301] & byte & 0x20))
+ if (((byte ^ Memory.FillRAM[0x220a]) & 0x20) && (Memory.FillRAM[0x2301] & byte & 0x20))
{
+ Memory.FillRAM[0x220b] &= ~0x20;
SA1.Flags |= IRQ_PENDING_FLAG;
SA1.IRQActive |= DMA_IRQ_SOURCE;
}
+ if (((byte ^ Memory.FillRAM[0x220a]) & 0x10) && (Memory.FillRAM[0x2301] & byte & 0x10))
+ Memory.FillRAM[0x220b] &= ~0x10;
break;
case 0x220b:
if (byte & 0x80)
@@ -389,7 +416,7 @@ void S9xSetSA1(uint8_t byte, uint32_t address)
Memory.FillRAM [0x2301] &= ~0x20;
}
if (byte & 0x10)
- Memory.FillRAM [0x2301] &= ~0x10; // Clear NMI
+ Memory.FillRAM [0x2301] &= ~0x10;
if (!SA1.IRQActive)
SA1.Flags &= ~IRQ_PENDING_FLAG;
break;
@@ -410,23 +437,26 @@ void S9xSetSA1(uint8_t byte, uint32_t address)
if (byte & 0x80)
SA1.in_char_dma = 0;
break;
- case 0x2236:
- Memory.FillRAM [address] = byte;
- if ((Memory.FillRAM [0x2230] & 0xa4) == 0x80)
- S9xSA1DMA(); // Normal DMA to I-RAM
- else if ((Memory.FillRAM [0x2230] & 0xb0) == 0xb0)
+ case 0x2236: /* DMA destination start address (LH) */
+ Memory.FillRAM[address] = byte;
+ if ((Memory.FillRAM[0x2230] & 0xa4) == 0x80) /* Normal DMA to I-RAM */
+ S9xSA1DMA(); /* Normal DMA to I-RAM */
+ else if ((Memory.FillRAM[0x2230] & 0xb0) == 0xb0)
{
- Memory.FillRAM [0x2300] |= 0x20;
- if (Memory.FillRAM [0x2201] & 0x20)
- S9xSetIRQ(SA1_DMA_IRQ_SOURCE);
SA1.in_char_dma = 1;
+ Memory.FillRAM[0x2300] |= 0x20;
+ if (Memory.FillRAM[0x2201] & 0x20)
+ {
+ Memory.FillRAM[0x2202] &= ~0x20;
+ S9xSetIRQ(SA1_DMA_IRQ_SOURCE);
+ }
}
- return;
+ break;
case 0x2237:
Memory.FillRAM [address] = byte;
if ((Memory.FillRAM [0x2230] & 0xa4) == 0x84)
S9xSA1DMA(); // Normal DMA to BW-RAM
- return;
+ break;
case 0x223f:
SA1.VirtualBitmapFormat = (byte & 0x80) ? 2 : 4;
break;
@@ -434,14 +464,14 @@ void S9xSetSA1(uint8_t byte, uint32_t address)
Memory.FillRAM [address] = byte;
if ((Memory.FillRAM [0x2230] & 0xb0) == 0xa0)
{
- // Char conversion 2 DMA enabled
- // memmove converted: Same malloc but constant non-overlapping addresses [Neb]
+ /* Char conversion 2 DMA enabled */
+ /* memmove converted: Same malloc but constant non-overlapping addresses [Neb] */
memcpy(&Memory.ROM [MAX_ROM_SIZE - 0x10000] + (SA1.in_char_dma << 4), &Memory.FillRAM [0x2240], 16);
SA1.in_char_dma = (SA1.in_char_dma + 1) & 7;
if ((SA1.in_char_dma & 3) == 0)
S9xSA1CharConv2();
}
- return;
+ break;
case 0x2250:
if (byte & 2)
SA1.sum = 0;
@@ -451,48 +481,55 @@ void S9xSetSA1(uint8_t byte, uint32_t address)
SA1.op1 = (SA1.op1 & 0xff00) | byte;
break;
case 0x2252:
- SA1.op1 = (SA1.op1 & 0xff) | (byte << 8);
+ SA1.op1 = (SA1.op1 & 0x00ff) | (byte << 8);
break;
case 0x2253:
SA1.op2 = (SA1.op2 & 0xff00) | byte;
break;
case 0x2254:
- SA1.op2 = (SA1.op2 & 0xff) | (byte << 8);
+ SA1.op2 = (SA1.op2 & 0x00ff) | (byte << 8);
switch (SA1.arithmetic_op)
{
- case 0: // multiply
- SA1.sum = SA1.op1 * SA1.op2;
+ case 0: /* multiply */
+ SA1.sum = (int16_t) SA1.op1 * (int16_t) SA1.op2;
+ SA1.op2 = 0;
break;
- case 1: // divide
+ case 1: /* divide */
if (SA1.op2 == 0)
- SA1.sum = SA1.op1 << 16;
+ SA1.sum = 0;
else
{
- uint32_t x = (SA1.op1 / (uint16_t) SA1.op2);
- SA1.sum = x | ((SA1.op1 - (x * (uint16_t) SA1.op2)) << 16);
+ int16_t quotient = (int16_t) SA1.op1 / (uint16_t) SA1.op2;
+ uint16_t remainder = (int16_t) SA1.op1 % (uint16_t) SA1.op2;
+ SA1.sum = (remainder << 16) | quotient;
}
+ SA1.op1 = 0;
+ SA1.op2 = 0;
break;
- default: // cumulative sum
- SA1.sum += SA1.op1 * SA1.op2;
- if (SA1.sum & ((int64_t) 0xffffff << 32))
- SA1.overflow = true;
+ default: /* cumulative sum */
+ SA1.sum += (int16_t) SA1.op1 * (int16_t) SA1.op2;
+ SA1.overflow = (SA1.sum >= (1ULL << 40));
+ SA1.sum &= (1ULL << 40) - 1;
+ SA1.op2 = 0;
break;
}
break;
- case 0x2258: // Variable bit-field length/auto inc/start.
- Memory.FillRAM [0x2258] = byte;
+ case 0x2258: /* Variable bit-field length/auto inc/start. */
+ Memory.FillRAM[0x2258] = byte;
S9xSA1ReadVariableLengthData(true, false);
return;
case 0x2259:
case 0x225a:
- case 0x225b: // Variable bit-field start address
- Memory.FillRAM [address] = byte;
+ case 0x225b: /* Variable bit-field start address */
+ Memory.FillRAM[address] = byte;
SA1.variable_bit_pos = 0;
S9xSA1ReadVariableLengthData(false, true);
return;
+ default:
+ break;
}
- Memory.FillRAM [address] = byte;
+ Memory.FillRAM[address] = byte;
}
static void S9xSA1CharConv2()
@@ -537,14 +574,14 @@ static void S9xSA1DMA()
switch (Memory.FillRAM [0x2230] & 3)
{
- case 0: // ROM
+ case 0: /* ROM */
s = SA1.Map [(src >> MEMMAP_SHIFT) & MEMMAP_MASK];
if (s >= (uint8_t*) MAP_LAST)
s += (src & 0xffff);
else
s = Memory.ROM + (src & 0xffff);
break;
- case 1: // BW-RAM
+ case 1: /* BW-RAM */
src &= Memory.SRAMMask;
len &= Memory.SRAMMask;
s = Memory.SRAM + src;
@@ -568,7 +605,7 @@ static void S9xSA1DMA()
len &= 0x3ff;
d = &Memory.FillRAM [0x3000] + dst;
}
- // memmove required: Can overlap arbitrarily [Neb]
+ /* memmove required: Can overlap arbitrarily [Neb] */
memmove(d, s, len);
Memory.FillRAM [0x2301] |= 0x20;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 21:37:28 +0000