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/*
casm - Simple, portable assembler
Copyright (C) 2003-2015 Ian Cowburn (ianc@noddybox.co.uk)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------
Stores assembly state (passes, memory, etc).
Memory is arranged in banks of RAM of 64K each.
*/
#ifndef CASM_STATE_H
#define CASM_STATE_H
/* ---------------------------------------- TYPES
*/
#define BANK_SIZE 0x10000u
typedef enum
{
MSB_Word,
LSB_Word
} WordMode;
typedef struct
{
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 */
} MemoryBank;
/* ---------------------------------------- INTERFACES
*/
/* Clear state to default. This creates 64K of RAM to write into and sets
zero as the current bank.
*/
void ClearState(void);
/* Sets the current bank to use. If it's never been used before it will be
initialised as an empty 64K of RAM.
*/
void SetAddressBank(unsigned bank);
/* Get the current bank
*/
unsigned Bank(void);
/* Move onto the next pass
*/
void NextPass(void);
/* Is final pass?
*/
int IsFinalPass(void);
/* Is first pass?
*/
int IsFirstPass(void);
/* Is intermediate pass?
*/
int IsIntermediatePass(void);
/* Set number of passes needed. This works while IsFinalPass() returns FALSE.
*/
void SetNeededPasses(int n);
/* Get current pass. Just used for debug.
*/
int GetCurrentPass(void);
/* Set the current PC
*/
void SetPC(int i);
/* Set the mode to write words in
*/
void SetWordMode(WordMode mode);
/* Set the size of address space
*/
void SetAddressSpace(int size);
/* Get the current PC
*/
int PC(void);
/* Add a number to the PC
*/
void PCAdd(int i);
/* Write a byte to the PC and increment it
*/
void PCWrite(int i);
/* Write a word to the PC and increment it
*/
void PCWriteWord(int i);
void PCWriteWordMode(int i, WordMode mode);
/* Gets a list of the banks used as an array of pointers. A NULL return means
no memory was written to at all.
*count will be updated with the number of banks used, or zero if no memory
was written to. Note that banks may not be contiguously numbered, but will
be in ascending order.
*/
MemoryBank **MemoryBanks(int *count);
/* Read a byte from the current bank.
*/
Byte ReadByte(int addr);
#endif
/*
vim: ai sw=4 ts=8 expandtab
*/
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