| 1 | /* Author : Rick van der Zwet
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| 2 | * S-number : 0433373
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| 3 | * Version : $Id: memory.c 365 2007-12-03 08:54:04Z rick $
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| 4 | * Copyright : FreeBSD Licence
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| 5 | * Description : Memory unit
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| 6 | */
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| 7 |
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| 8 | #include <stdlib.h>
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| 9 | #include <stdio.h>
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| 10 | #include <sysexits.h>
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| 11 | #include "memory.h"
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| 12 |
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| 13 | /* Initial value */
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| 14 | boolean mem_busy = FALSE;
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| 15 |
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| 16 |
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| 17 | void
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| 18 | readmem()
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| 19 | {
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| 20 | int address = 0;
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| 21 | uint32_t input = 0;
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| 22 |
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| 23 | //read 4-byte integer numbers in hexadecimal from input
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| 24 | while (scanf("%x", &input) != EOF) {
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| 25 | mem_operation(address * 4, input, WRITE_WORD);
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| 26 | address++;
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| 27 | }
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| 28 | //zero the end
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| 29 | for (; address < 1024; address++)
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| 30 | mem_operation(address * 4, 0, WRITE_WORD);
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| 31 | }
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| 32 |
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| 33 |
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| 34 | void
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| 35 | writemem()
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| 36 | {
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| 37 | int zeros = 0;
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| 38 | int address = 0;
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| 39 | word value = 0;
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| 40 | for (address = 0; address < 1024; address++) {
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| 41 | value = mem_operation(address * 4, 0, READ);
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| 42 | if (value == 0)
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| 43 | zeros++;
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| 44 | else {
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| 45 | for (; zeros > 0; zeros--)
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| 46 | printf("%#010x\n", 0);
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| 47 | printf("%#010x\n", value);
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 |
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| 52 |
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| 53 | word
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| 54 | mem_operation(const word address, const word value,
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| 55 | const mem_control_t action)
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| 56 | {
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| 57 | static union memword_t memory[1024];
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| 58 |
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| 59 | int coreAddress = address / 4;
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| 60 | int8_t offset = address % 4;
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| 61 |
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| 62 | if (coreAddress > 1024) {
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| 63 | fprintf(stderr, "Memory which is greater than 1024 word, '%i'\n",
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| 64 | coreAddress);
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| 65 | exit(EX_SOFTWARE);
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| 66 | }
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| 67 |
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| 68 | switch (action) {
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| 69 | case READ:
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| 70 | if (offset != 0) {
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| 71 | fprintf(stderr, "Read needs mod 4 bytes alligned\n");
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| 72 | exit(EX_SOFTWARE);
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| 73 | } else {
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| 74 | mem_busy = FALSE;
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| 75 | return(memory[coreAddress].fullword);
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| 76 | }
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| 77 | break;
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| 78 | case WRITE_BYTE:
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| 79 | memory[coreAddress].byte[offset] = (byte)value;
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| 80 | break;
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| 81 | case WRITE_HALFWORD:
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| 82 | if ((offset % 2) != 0) {
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| 83 | fprintf(stderr, "Halfword need mod 16 bits alligned\n");
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| 84 | exit(EX_SOFTWARE);
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| 85 | }
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| 86 | memory[coreAddress].halfword[offset / 2] = (halfword)value;
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| 87 | break;
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| 88 | case WRITE_WORD:
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| 89 | if (offset != 0) {
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| 90 | fprintf(stderr, "Write needs mod 4 bytes alligned\n");
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| 91 | exit(EX_SOFTWARE);
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| 92 | }
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| 93 | memory[coreAddress].fullword = value;
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| 94 | break;
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| 95 | default:
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| 96 | fprintf(stderr, "Memory control '%i' not implemented\n", action);
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| 97 | exit(EX_SOFTWARE);
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| 98 | break;
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| 99 | };
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| 100 | mem_busy = FALSE;
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| 101 | return(0);
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| 102 | }
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