avr/cmd_loadcpm3.c

   1 /*
   2  * (C) Copyright 2015 Leo C. <erbl259-lmu@yahoo.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 /*
   8  * See CP/M 3 System Manual, Appendix D: CPM3.SYS File Format
   9  */
  10
  11 #include "common.h"
  12 #include <stdlib.h>
  13 #include <ctype.h>
  14 #include <string.h>
  15 #include <stdbool.h>
  16
  17 #include "command.h"
  18 #include "env.h"
  19 #include "ff.h"
  20 #include "con-utils.h"
  21 #include "z80-if.h"
  22 #include "debug.h"
  23
  24
  25 #define RS              128             /* CP/M record size */
  26
  27 #define FSIZE_t DWORD
  28
  29 /*
  30  *      Load Routine
  31  *
  32  *      Input:  addr = Page Address of load top
  33  *                      len  = Length in pages of module to read
  34  *
  35  */
  36 int load(FIL *File, uint32_t addr, uint8_t len)
  37 {
  38         uint8_t buffer[RS];
  39         unsigned int br;                                        /* bytes read */
  40         int res;
  41
  42         len *= 2;               /* length in records of module */
  43         //debug("## load: addr: 0x%.4X, records: 0x%.4X, (%u)\n", addr, len, len);
  44
  45         for (; len; len--) {
  46                 addr -= RS;
  47                 res = f_read(File, buffer, RS, &br);
  48                 if (res || br != RS) {
  49                         return 1;
  50                 }
  51
  52                 if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
  53                         my_puts_P(PSTR("Bus timeout\n"));
  54                         return 2;
  55                 }
  56                 z80_write_block(buffer, addr, RS);
  57                 z80_bus_cmd(Release);
  58                 //debug("## written: 0x%.4X\n", addr);
  59         }
  60
  61         return 0;
  62 }
  63
  64 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
  65
  66 command_ret_t do_loadcpm3(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  67 {
  68         uint16_t mem_top;
  69         uint8_t res_len;
  70         uint16_t bank_top;
  71         uint8_t bank_len;
  72         uint16_t osentry_addr = 0;
  73         uint32_t common_base = 0;
  74         uint32_t banked_base;
  75         char *fname;
  76         FIL File;
  77         char default_fname[] = CONFIG_CPM3_SYSFILE;
  78         unsigned int br;                                        /* bytes read */
  79         uint8_t buffer[RS];
  80         int res;
  81
  82         (void) cmdtp; (void) flag;
  83
  84
  85         //common_base = getenv_ulong(PSTR(ENV_CPM3_COMMON_BASE), 16,
  86         //                                      CONFIG_CPM3_COMMON_BASE);
  87         banked_base = getenv_ulong(PSTR(ENV_CPM3_BANKED_BASE), 16,
  88                                                 CONFIG_CPM3_BANKED_BASE);
  89
  90         if (argc > 3)
  91                 banked_base = strtoul(argv[3], NULL, 16);
  92         if (argc > 2)
  93                 common_base = strtoul(argv[2], NULL, 16);
  94
  95         fname = getenv_char(PSTR(ENV_CPM3_SYSFILE));
  96         if (argc > 1) {
  97                 fname = argv[1];
  98         }
  99         if (fname == NULL || *fname == '\0')
 100                 fname = default_fname;
 101
 102         res = f_open(&File, fname, FA_READ );
 103         if (res) {
 104                 printf_P(PSTR("Error: failed to open '%s'\n"), fname);
 105                 return CMD_RET_FAILURE;
 106         }
 107
 108         printf_P(PSTR("Loading: '%s'...\n"), fname);
 109
 110         /* read the load record */
 111         res = f_read(&File, buffer, RS, &br);
 112         if (res || br != RS)
 113                 goto out;
 114
 115         mem_top = buffer[0] << 8;
 116         res_len = buffer[1];
 117         bank_top = buffer[2] << 8;
 118         bank_len = buffer[3];
 119         osentry_addr = buffer[4] + (buffer[5] << 8);
 120
 121         /* read display info */
 122         res = f_read(&File, buffer, RS, &br);
 123         if (res || br != RS)
 124                 goto out;
 125
 126         /* print the info */
 127         buffer[RS-1] = '$';
 128         uint8_t *p = memchr(buffer, '$', RS);
 129         *p = '\0';
 130         my_puts((char *)buffer);
 131
 132         if (common_base == 0) {
 133                 /* read common base
 134                  * http://www.seasip.info/Cpm/scb.html
 135                  */
 136                 FSIZE_t common_base_ofs = ((res_len - 6) << 8)  + 2*RS + RS-7;
 137                 FSIZE_t cur_pos = f_tell(&File);
 138                 if ((res = f_lseek(&File, common_base_ofs)) ||
 139                                 (res = f_read(&File, buffer, 2, &br)) ||
 140                                 (br != 2) ||
 141                                 (res = f_lseek(&File, cur_pos)))
 142                         goto out;
 143                 common_base = (uint16_t) buffer[0] + (buffer[1] << 8);
 144                 setenv_hex(PSTR(ENV_CPM3_COMMON_BASE), common_base);
 145         }
 146         /* Main System Load     */
 147
 148         /* Load Common Portion of System */
 149         if ((res = load(&File, common_base + mem_top, res_len)) != 0)
 150                 goto out;
 151
 152         /* Load Banked Portion of System */
 153         res = load(&File, banked_base + bank_top, bank_len);
 154
 155 out:
 156         f_close(&File);
 157
 158         if (res) {
 159                 printf_P(PSTR("Error: failed to read '%s'\n"), fname);
 160                 return CMD_RET_FAILURE;
 161         } else {
 162                 if (res_len != 0) {
 163                         if (osentry_addr + common_base > 0xffff) {
 164                                 z80_bus_cmd(Request);
 165                                 if (z80_read(osentry_addr + common_base) == 0xc3) {
 166                                         osentry_addr = z80_read(osentry_addr+common_base+1) +
 167                                                         (z80_read(osentry_addr + common_base+2) << 8);
 168                                 }
 169                                 z80_bus_cmd(Release);
 170                                 if (banked_base + osentry_addr > 0xffff)
 171                                         osentry_addr = 0;
 172                         }
 173                         setenv_hex(PSTR(ENV_STARTADDRESS), osentry_addr);
 174                 }
 175                 printf_P(PSTR("Loaded: Resident: "));
 176                 if (res_len != 0)
 177                         printf_P(PSTR("0x%.5lX-0x%.5lX, "),
 178                                 (common_base + mem_top) - res_len*256,
 179                                 (common_base + mem_top) - 1);
 180                 else
 181                         printf_P(PSTR(" -  "));
 182                 printf_P(PSTR("Banked: "));
 183                 if (bank_len != 0)
 184                         printf_P(PSTR("0x%.5lX-0x%.5lX\n"),
 185                         (banked_base + bank_top) - bank_len*256,
 186                         (banked_base + bank_top) - 1);
 187                 else
 188                         printf_P(PSTR(" -  \n"));
 189
 190                 return CMD_RET_SUCCESS;
 191         }
 192 }