Make experimental bitstream optional

[pistorm] / m68kcpu.h

diff --git a/m68kcpu.h b/m68kcpu.h
index d087d6260c09ce93622c7eedd60522d8d64ec391..b5b919745217c2837c88a73d6cd9421f4de5c1fa 100644 (file)
--- a/m68kcpu.h
+++ b/m68kcpu.h
@@ -937,6 +937,15 @@ typedef union
        double f;
 } fp_reg;
 
+typedef struct
+{
+    unsigned int lower;
+    unsigned int upper;
+    unsigned char *offset;
+} address_translation_cache;
+
+
+
 typedef struct
 {
        uint cpu_type;     /* CPU Type: 68000, 68008, 68010, 68EC020, 68020, 68EC030, 68030, 68EC040, or 68040 */
@@ -1042,6 +1051,19 @@ typedef struct
        void (*set_fc_callback)(unsigned int new_fc);     /* Called when the CPU function code changes */
        void (*instr_hook_callback)(unsigned int pc);     /* Called every instruction cycle prior to execution */
 
+       /* address translation caches */
+
+       unsigned char read_ranges;
+       unsigned int read_addr[8];
+       unsigned int read_upper[8];
+       unsigned char *read_data[8];
+       unsigned char write_ranges;
+       unsigned int write_addr[8];
+       unsigned int write_upper[8];
+       unsigned char *write_data[8];
+       address_translation_cache code_translation_cache;
+
+
 } m68ki_cpu_core;
 
 
@@ -1076,15 +1098,6 @@ char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type);
 
 /* ---------------------------- Read Immediate ---------------------------- */
 
-extern unsigned char read_ranges;
-extern unsigned int read_addr[8];
-extern unsigned int read_upper[8];
-extern unsigned char *read_data[8];
-extern unsigned char write_ranges;
-extern unsigned int write_addr[8];
-extern unsigned int write_upper[8];
-extern unsigned char *write_data[8];
-
 // clear the instruction cache
 inline void m68ki_ic_clear()
 {
@@ -1152,46 +1165,21 @@ static inline uint32 m68ki_ic_readimm16(uint32 address)
 /* Handles all immediate reads, does address error check, function code setting,
  * and prefetching if they are enabled in m68kconf.h
  */
-static inline uint m68ki_read_imm_16(void)
-{
-       uint32_t address = ADDRESS_68K(REG_PC);
-       for (int i = 0; i < read_ranges; i++) {
-               if(address >= read_addr[i] && address < read_upper[i]) {
-                       REG_PC += 2;
-                       return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);
-               }
-       }
+uint m68ki_read_imm6_addr_slowpath(uint32_t pc, address_translation_cache *cache);
 
-       m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
-       m68ki_cpu.mmu_tmp_fc = FLAG_S | FUNCTION_CODE_USER_PROGRAM;
-       m68ki_cpu.mmu_tmp_rw = 1;
-       m68ki_cpu.mmu_tmp_sz = M68K_SZ_WORD;
-       m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
 
-#if M68K_EMULATE_PREFETCH
+
+static inline uint m68ki_read_imm_16(void)
 {
-       uint result;
-       if(REG_PC != CPU_PREF_ADDR)
+       uint32_t pc = REG_PC;
+
+       address_translation_cache *cache = &m68ki_cpu.code_translation_cache;
+       if(pc >= cache->lower && pc < cache->upper)
        {
-               CPU_PREF_DATA = m68ki_ic_readimm16(REG_PC);
-               CPU_PREF_ADDR = m68ki_cpu.mmu_tmp_buserror_occurred ? ((uint32)~0) : REG_PC;
+               REG_PC += 2;
+               return be16toh(((unsigned short *)(cache->offset + pc))[0]);
        }
-       result = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
-       REG_PC += 2;
-       if (!m68ki_cpu.mmu_tmp_buserror_occurred) {
-               // prefetch only if no bus error occurred in opcode fetch
-               CPU_PREF_DATA = m68ki_ic_readimm16(REG_PC);
-               CPU_PREF_ADDR = m68ki_cpu.mmu_tmp_buserror_occurred ? ((uint32)~0) : REG_PC;
-               // ignore bus error on prefetch
-               m68ki_cpu.mmu_tmp_buserror_occurred = 0;
-       }
-       return result;
-}
-#else
-       REG_PC += 2;
-
-       return m68k_read_immediate_16(address);
-#endif /* M68K_EMULATE_PREFETCH */
+       return m68ki_read_imm6_addr_slowpath(pc, cache);
 }
 
 static inline uint m68ki_read_imm_8(void)
@@ -1209,10 +1197,10 @@ static inline uint m68ki_read_imm_32(void)
 #endif
 #endif
        uint32_t address = ADDRESS_68K(REG_PC);
-       for (int i = 0; i < read_ranges; i++) {
-               if(address >= read_addr[i] && address < read_upper[i]) {
+       for (int i = 0; i < m68ki_cpu.read_ranges; i++) {
+               if(address >= m68ki_cpu.read_addr[i] && address < m68ki_cpu.read_upper[i]) {
                        REG_PC += 4;
-                       return be32toh(((unsigned int *)(read_data[i] + (address - read_addr[i])))[0]);
+                       return be32toh(((unsigned int *)(m68ki_cpu.read_data[i] + (address - m68ki_cpu.read_addr[i])))[0]);
                }
        }
 
@@ -1270,9 +1258,9 @@ static inline uint m68ki_read_8_fc(uint address, uint fc)
            address = pmmu_translate_addr(address,1);
 #endif
 
-       for (int i = 0; i < read_ranges; i++) {
-               if(address >= read_addr[i] && address < read_upper[i]) {
-                       return read_data[i][address - read_addr[i]];
+       for (int i = 0; i < m68ki_cpu.read_ranges; i++) {
+               if(address >= m68ki_cpu.read_addr[i] && address < m68ki_cpu.read_upper[i]) {
+                       return m68ki_cpu.read_data[i][address - m68ki_cpu.read_addr[i]];
                }
        }
 
@@ -1291,9 +1279,9 @@ static inline uint m68ki_read_16_fc(uint address, uint fc)
            address = pmmu_translate_addr(address,1);
 #endif
 
-       for (int i = 0; i < read_ranges; i++) {
-               if(address >= read_addr[i] && address < read_upper[i]) {
-                       return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);
+       for (int i = 0; i < m68ki_cpu.read_ranges; i++) {
+               if(address >= m68ki_cpu.read_addr[i] && address < m68ki_cpu.read_upper[i]) {
+                       return be16toh(((unsigned short *)(m68ki_cpu.read_data[i] + (address - m68ki_cpu.read_addr[i])))[0]);
                }
        }
 
@@ -1312,9 +1300,9 @@ static inline uint m68ki_read_32_fc(uint address, uint fc)
            address = pmmu_translate_addr(address,1);
 #endif
 
-       for (int i = 0; i < read_ranges; i++) {
-               if(address >= read_addr[i] && address < read_upper[i]) {
-                       return be32toh(((unsigned int *)(read_data[i] + (address - read_addr[i])))[0]);
+       for (int i = 0; i < m68ki_cpu.read_ranges; i++) {
+               if(address >= m68ki_cpu.read_addr[i] && address < m68ki_cpu.read_upper[i]) {
+                       return be32toh(((unsigned int *)(m68ki_cpu.read_data[i] + (address - m68ki_cpu.read_addr[i])))[0]);
                }
        }
 
@@ -1333,9 +1321,9 @@ static inline void m68ki_write_8_fc(uint address, uint fc, uint value)
            address = pmmu_translate_addr(address,0);
 #endif
 
-       for (int i = 0; i < write_ranges; i++) {
-               if(address >= write_addr[i] && address < write_upper[i]) {
-                       write_data[i][address - write_addr[i]] = (unsigned char)value;
+       for (int i = 0; i < m68ki_cpu.write_ranges; i++) {
+               if(address >= m68ki_cpu.write_addr[i] && address < m68ki_cpu.write_upper[i]) {
+                       m68ki_cpu.write_data[i][address - m68ki_cpu.write_addr[i]] = (unsigned char)value;
                        return;
                }
        }
@@ -1355,9 +1343,9 @@ static inline void m68ki_write_16_fc(uint address, uint fc, uint value)
            address = pmmu_translate_addr(address,0);
 #endif
 
-       for (int i = 0; i < write_ranges; i++) {
-               if(address >= write_addr[i] && address < write_upper[i]) {
-                       ((short *)(write_data[i] + (address - write_addr[i])))[0] = htobe16(value);
+       for (int i = 0; i < m68ki_cpu.write_ranges; i++) {
+               if(address >= m68ki_cpu.write_addr[i] && address < m68ki_cpu.write_upper[i]) {
+                       ((short *)(m68ki_cpu.write_data[i] + (address - m68ki_cpu.write_addr[i])))[0] = htobe16(value);
                        return;
                }
        }
@@ -1377,9 +1365,9 @@ static inline void m68ki_write_32_fc(uint address, uint fc, uint value)
            address = pmmu_translate_addr(address,0);
 #endif
 
-       for (int i = 0; i < write_ranges; i++) {
-               if(address >= write_addr[i] && address < write_upper[i]) {
-                       ((int *)(write_data[i] + (address - write_addr[i])))[0] = htobe32(value);
+       for (int i = 0; i < m68ki_cpu.write_ranges; i++) {
+               if(address >= m68ki_cpu.write_addr[i] && address < m68ki_cpu.write_upper[i]) {
+                       ((int *)(m68ki_cpu.write_data[i] + (address - m68ki_cpu.write_addr[i])))[0] = htobe32(value);
                        return;
                }
        }