diff options
Diffstat (limited to 'z80.h')
| -rw-r--r-- | z80.h | 103 |
1 files changed, 49 insertions, 54 deletions
@@ -35,12 +35,6 @@ /* ---------------------------------------- TYPES */ -/* The processor -*/ -struct Z80; -typedef struct Z80 Z80; - - /* Large unsigned type */ typedef unsigned long Z80Val; @@ -61,6 +55,53 @@ typedef signed char Z80Relative; typedef unsigned short Z80Word; +/* A Z80 16-bit register. To access the HI/LO component use the indexes + Z80_HI_WORD and Z80_LO_WORD which will be initialised once Z80Init has been + called. +*/ +typedef union +{ + Z80Word w; + Z80Byte b[2]; +} Z80Reg; + +extern int Z80_HI_WORD; +extern int Z80_LO_WORD; + + +/* The processor +*/ +struct Z80Private; + +typedef struct +{ + Z80Word PC; + + Z80Reg AF; + Z80Reg BC; + Z80Reg DE; + Z80Reg HL; + + Z80Word AF_; + Z80Word BC_; + Z80Word DE_; + Z80Word HL_; + + Z80Reg IX; + Z80Reg IY; + + Z80Word SP; + + Z80Byte IFF1; + Z80Byte IFF2; + Z80Byte IM; + Z80Byte I; + Z80Byte R; + + struct Z80Private *priv; +} Z80; + + /* Interfaces used to handle memory */ typedef Z80Byte (*Z80ReadMemory)(Z80 *cpu, Z80Word address); @@ -100,36 +141,6 @@ typedef enum } Z80CallbackReason; -/* Get/settable state of the Z80 -*/ -typedef struct -{ - Z80Word PC; - Z80Word SP; - - Z80Val cycle; - - Z80Word AF; - Z80Word BC; - Z80Word DE; - Z80Word HL; - - Z80Word AF_; /* Alternate registers */ - Z80Word BC_; - Z80Word DE_; - Z80Word HL_; - - Z80Word IX; - Z80Word IY; - - Z80Byte IFF1; - Z80Byte IFF2; - Z80Byte IM; - Z80Byte I; - Z80Byte R; -} Z80State; - - /* Flags in the F register */ typedef enum @@ -179,21 +190,6 @@ Z80 *Z80Init(Z80ReadMemory read_memory, void Z80Reset(Z80 *cpu); -/* Sets the PC -*/ -void Z80SetPC(Z80 *cpu, Z80Word PC); - - -/* Gets the PC -*/ -Z80Word Z80GetPC(Z80 *cpu); - - -/* Sets the cycle count to the specified count -*/ -void Z80ResetCycles(Z80 *cpu, Z80Val cycles); - - /* Lodge a callback to be invoked after special events. Returns FALSE if the callback couldn't be lodged (there is a max of 10 callbacks per reason). @@ -233,11 +229,10 @@ int Z80SingleStep(Z80 *cpu); void Z80Exec(Z80 *cpu); -/* Interrogate the state of the Z80 +/* Manipulate the cylce count of the Z80 */ Z80Val Z80Cycles(Z80 *cpu); -void Z80GetState(Z80 *cpu, Z80State *state); -void Z80SetState(Z80 *cpu, const Z80State *state); +void Z80ResetCycles(Z80 *cpu, Z80Val cycles); /* Set address to label mappings for the disassembler |