avr/cmd_loadcpm3.c

   1 /*
   2  * (C) Copyright 2015,2016 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 "cmd_loadcpm3.h"
  12 #include <ctype.h>
  13
  14 #include "env.h"
  15 #include "ff.h"
  16 #include "eval_arg.h"
  17 #include "con-utils.h"
  18 #include "z80-if.h"
  19 #include "debug.h"
  20
  21
  22 #define RS              128             /* CP/M record size */
  23
  24 #define FSIZE_t DWORD
  25
  26 /*
  27  *      Load Routine
  28  *
  29  *      Input:  addr = Page Address of load top
  30  *                      len  = Length in pages of module to read
  31  *
  32  */
  33 int load(FIL *File, uint32_t addr, uint8_t len)
  34 {
  35         uint8_t buffer[RS];
  36         unsigned int br;                                        /* bytes read */
  37         int res;
  38
  39         len *= 2;               /* length in records of module */
  40         //debug("## load: addr: 0x%.4X, records: 0x%.4X, (%u)\n", addr, len, len);
  41
  42         for (; len; len--) {
  43                 addr -= RS;
  44                 res = f_read(File, buffer, RS, &br);
  45                 if (res || br != RS) {
  46                         return 1;
  47                 }
  48
  49                 if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
  50                         my_puts_P(PSTR("Bus timeout\n"));
  51                         return 2;
  52                 }
  53                 z80_write_block(buffer, addr, RS);
  54                 z80_bus_cmd(Release);
  55                 //debug("## written: 0x%.4X\n", addr);
  56         }
  57
  58         return 0;
  59 }
  60
  61 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
  62
  63 command_ret_t do_loadcpm3(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
  64 {
  65         uint16_t mem_top;
  66         uint8_t res_len;
  67         uint16_t bank_top;
  68         uint8_t bank_len;
  69         uint16_t osentry_addr = 0;
  70         uint32_t common_base = 0;
  71         uint32_t banked_base;
  72         char *fname;
  73         FIL File;
  74         char default_fname[] = CONFIG_CPM3_SYSFILE;
  75         unsigned int br;                                        /* bytes read */
  76         uint8_t buffer[RS];
  77         int res;
  78
  79         (void) cmdtp; (void) flag;
  80
  81
  82         //common_base = getenv_ulong(PSTR(ENV_CPM3_COMMON_BASE), 16,
  83         //                                      CONFIG_CPM3_COMMON_BASE);
  84         banked_base = getenv_ulong(PSTR(ENV_CPM3_BANKED_BASE), 16,
  85                                                 CONFIG_CPM3_BANKED_BASE);
  86
  87         if (argc > 3)
  88                 banked_base = eval_arg(argv[3], NULL);
  89         if (argc > 2)
  90                 common_base = eval_arg(argv[2], NULL);
  91
  92         fname = getenv_str(PSTR(ENV_CPM3_SYSFILE));
  93         if (argc > 1) {
  94                 fname = argv[1];
  95         }
  96         if (fname == NULL || *fname == '\0')
  97                 fname = default_fname;
  98
  99         res = f_open(&File, fname, FA_READ );
 100         if (res) {
 101                 printf_P(PSTR("Error: failed to open '%s'\n"), fname);
 102                 return CMD_RET_FAILURE;
 103         }
 104
 105         printf_P(PSTR("Loading: '%s'...\n"), fname);
 106
 107         /* read the load record */
 108         res = f_read(&File, buffer, RS, &br);
 109         if (res || br != RS)
 110                 goto out;
 111
 112         mem_top = buffer[0] << 8;
 113         res_len = buffer[1];
 114         bank_top = buffer[2] << 8;
 115         bank_len = buffer[3];
 116         osentry_addr = buffer[4] + (buffer[5] << 8);
 117
 118         /* read display info */
 119         res = f_read(&File, buffer, RS, &br);
 120         if (res || br != RS)
 121                 goto out;
 122
 123         /* print the info */
 124         buffer[RS-1] = '$';
 125         uint8_t *p = memchr(buffer, '$', RS);
 126         *p = '\0';
 127         my_puts((char *)buffer);
 128
 129         if (common_base == 0) {
 130                 /* read common base
 131                  * http://www.seasip.info/Cpm/scb.html
 132                  */
 133                 FSIZE_t common_base_ofs = ((res_len - 6) << 8)  + 2*RS + RS-7;
 134                 FSIZE_t cur_pos = f_tell(&File);
 135                 if ((res = f_lseek(&File, common_base_ofs)) ||
 136                                 (res = f_read(&File, buffer, 2, &br)) ||
 137                                 (br != 2) ||
 138                                 (res = f_lseek(&File, cur_pos)))
 139                         goto out;
 140                 common_base = (uint16_t) buffer[0] + (buffer[1] << 8);
 141                 setenv_hex(PSTR(ENV_CPM3_COMMON_BASE), common_base);
 142         }
 143
 144         setenv_hex(PSTR(ENV_CPM3_SCB), mem_top - ((res_len - (6 - 1)) << 8) + 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 }