diff options
Diffstat (limited to 'src/state.h')
| -rw-r--r-- | src/state.h | 41 |
1 files changed, 24 insertions, 17 deletions
diff --git a/src/state.h b/src/state.h index 0ebdce5..e10463c 100644 --- a/src/state.h +++ b/src/state.h @@ -19,7 +19,9 @@ ------------------------------------------------------------------------- - Stores assembly state. + Stores assembly state (passes, memory, etc). + + Memory is arranged in banks of RAM of 64K each. */ @@ -28,23 +30,37 @@ /* ---------------------------------------- TYPES */ +#define BANK_SIZE 0x10000u + typedef enum { MSB_Word, LSB_Word } WordMode; + +typedef struct mbnk +{ + unsigned number; /* The bank number, 0 .. n */ + Byte memory[BANK_SIZE]; /* The memory in that bank */ + int min_address_used; /* Will be BANK_SIZE if not used */ + int max_address_used; /* Will be -1 if not used */ + struct mbnk *next; /* The next memory bank */ +} MemoryBank; + /* ---------------------------------------- INTERFACES */ -/* Clear state to default. This creates 64K of RAM to write into. +/* Clear state to default. This creates 64K of RAM to write into and sets + zero as the current bank. */ void ClearState(void); -/* Sets the number of bytes in RAM. Addressing always starts from zero. +/* Sets the current bank to use. If it's never been used before it will be + initialised as an empty 64K of RAM. */ -void SetAddressSpace(int size); +void SetAddressBank(unsigned bank); /* Move onto the next pass @@ -103,22 +119,13 @@ void PCWriteWord(int i); void PCWriteWordMode(int i, WordMode mode); -/* Get the minimum address written to -*/ -int GetMinAddressWritten(void); - - -/* Get the maximum address written to -*/ -int GetMaxAddressWritten(void); - - -/* Access the address space directly +/* Gets a list of the banks used. A NULL return means no memory was written + to at all. */ -const Byte *AddressSpace(void); +const MemoryBank *MemoryBanks(void); -/* Read a byte from the address space +/* Read a byte from the current bank. */ Byte ReadByte(int addr); |