o add my bsnes branch

2009-05-12 20:05:00 +02:00
parent 1c30d3db56
commit 091b82a7ef
402 changed files with 68660 additions and 0 deletions
--- a/tools/bsnes/memory/memory.cpp
+++ b/tools/bsnes/memory/memory.cpp
@@ -0,0 +1,121 @@
+#include <../base.hpp>
+#define MEMORY_CPP
+
+namespace memory {
+  MMIOAccess mmio;
+  StaticRAM  wram(128 * 1024);
+  StaticRAM  apuram(64 * 1024);
+  StaticRAM  vram(64 * 1024);
+  StaticRAM  oam(544);
+  StaticRAM  cgram(512);
+
+  UnmappedMemory memory_unmapped;
+  UnmappedMMIO   mmio_unmapped;
+};
+
+uint8 UnmappedMemory::read(unsigned) { return cpu.regs.mdr; }
+void UnmappedMemory::write(unsigned, uint8) {}
+
+uint8 UnmappedMMIO::mmio_read(unsigned) { return cpu.regs.mdr; }
+void UnmappedMMIO::mmio_write(unsigned, uint8) {}
+
+void MMIOAccess::map(unsigned addr, MMIO &access) {
+  //MMIO: $[00-3f]:[2000-5fff]
+  mmio[(addr - 0x2000) & 0x3fff] = &access;
+}
+
+MMIO* MMIOAccess::get(unsigned addr) {
+  return mmio[(addr - 0x2000) & 0x3fff];
+}
+
+uint8 MMIOAccess::read(unsigned addr) {
+	printf("MMIOAccess::read 0x%x\n",addr);
+
+	return mmio[(addr - 0x2000) & 0x3fff]->mmio_read(addr);
+}
+
+void MMIOAccess::write(unsigned addr, uint8 data) {
+  printf("MMIOAccess::write 0x%x %x\n",addr,data);
+  mmio[(addr - 0x2000) & 0x3fff]->mmio_write(addr, data);
+}
+
+unsigned Bus::mirror(unsigned addr, unsigned size) {
+  unsigned base = 0;
+  if(size) {
+    unsigned mask = 1 << 23;
+    while(addr >= size) {
+      while(!(addr & mask)) mask >>= 1;
+      addr -= mask;
+      if(size > mask) {
+        size -= mask;
+        base += mask;
+      }
+      mask >>= 1;
+    }
+    base += addr;
+  }
+  return base;
+}
+
+void Bus::map(unsigned addr, Memory &access, unsigned offset) {
+  page[addr >> 8].access = &access;
+  page[addr >> 8].offset = offset - addr;
+}
+
+void Bus::map(
+  MapMode mode,
+  uint8  bank_lo, uint8  bank_hi,
+  uint16 addr_lo, uint16 addr_hi,
+  Memory &access, unsigned offset, unsigned size
+) {
+  assert(bank_lo <= bank_hi);
+  assert(addr_lo <= addr_hi);
+
+  if(access.size() == -1U) return;
+
+  uint8 page_lo = addr_lo >> 8;
+  uint8 page_hi = addr_hi >> 8;
+  unsigned index = 0;
+
+  switch(mode) {
+    case MapDirect: {
+      printf("Bus::map MapDirect bank_lo=0x%02x bank_hi=0x%02x addr_lo=0x%04x addr_hi=0x%04x\n",
+    		  bank_lo,bank_hi,addr_lo,addr_hi);
+      for(unsigned bank = bank_lo; bank <= bank_hi; bank++) {
+        for(unsigned page = page_lo; page <= page_hi; page++) {
+          map((bank << 16) + (page << 8), access, (bank << 16) + (page << 8));
+        }
+      }
+    } break;
+
+    case MapLinear: {
+      printf("Bus::map MapLinear bank_lo=0x%02x bank_hi=0x%02x addr_lo=0x%04x addr_hi=0x%04x\n",
+      		  bank_lo,bank_hi,addr_lo,addr_hi);
+      for(unsigned bank = bank_lo; bank <= bank_hi; bank++) {
+        for(unsigned page = page_lo; page <= page_hi; page++) {
+          map((bank << 16) + (page << 8), access, mirror(offset + index, access.size()));
+          index += 256;
+          if(size) index %= size;
+        }
+      }
+    } break;
+
+    case MapShadow: {
+      printf("Bus::map MapShadow bank_lo=0x%02x bank_hi=0x%02x addr_lo=0x%04x addr_hi=0x%04x\n",
+        		  bank_lo,bank_hi,addr_lo,addr_hi);
+      for(unsigned bank = bank_lo; bank <= bank_hi; bank++) {
+        index += page_lo * 256;
+        if(size) index %= size;
+
+        for(unsigned page = page_lo; page <= page_hi; page++) {
+          map((bank << 16) + (page << 8), access, mirror(offset + index, access.size()));
+          index += 256;
+          if(size) index %= size;
+        }
+
+        index += (255 - page_hi) * 256;
+        if(size) index %= size;
+      }
+    } break;
+  }
+}