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/*
* (C) Copyright 2015,2016 Leo C. <erbl259-lmu@yahoo.de>
*
* SPDX-License-Identifier: GPL-2.0
*/
/*
* See CP/M 3 System Manual, Appendix D: CPM3.SYS File Format
*/
#include "common.h"
#include <ctype.h>
#include <string.h>
#include <stdbool.h>
#include "command.h"
#include "env.h"
#include "ff.h"
#include "eval_arg.h"
#include "con-utils.h"
#include "z80-if.h"
#include "debug.h"
#define RS 128 /* CP/M record size */
#define FSIZE_t DWORD
/*
* Load Routine
*
* Input: addr = Page Address of load top
* len = Length in pages of module to read
*
*/
int load(FIL *File, uint32_t addr, uint8_t len)
{
uint8_t buffer[RS];
unsigned int br; /* bytes read */
int res;
len *= 2; /* length in records of module */
//debug("## load: addr: 0x%.4X, records: 0x%.4X, (%u)\n", addr, len, len);
for (; len; len--) {
addr -= RS;
res = f_read(File, buffer, RS, &br);
if (res || br != RS) {
return 1;
}
if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
my_puts_P(PSTR("Bus timeout\n"));
return 2;
}
z80_write_block(buffer, addr, RS);
z80_bus_cmd(Release);
//debug("## written: 0x%.4X\n", addr);
}
return 0;
}
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
command_ret_t do_loadcpm3(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
uint16_t mem_top;
uint8_t res_len;
uint16_t bank_top;
uint8_t bank_len;
uint16_t osentry_addr = 0;
uint32_t common_base = 0;
uint32_t banked_base;
char *fname;
FIL File;
char default_fname[] = CONFIG_CPM3_SYSFILE;
unsigned int br; /* bytes read */
uint8_t buffer[RS];
int res;
(void) cmdtp; (void) flag;
//common_base = getenv_ulong(PSTR(ENV_CPM3_COMMON_BASE), 16,
// CONFIG_CPM3_COMMON_BASE);
banked_base = getenv_ulong(PSTR(ENV_CPM3_BANKED_BASE), 16,
CONFIG_CPM3_BANKED_BASE);
if (argc > 3)
banked_base = eval_arg(argv[3], NULL);
if (argc > 2)
common_base = eval_arg(argv[2], NULL);
fname = getenv_str(PSTR(ENV_CPM3_SYSFILE));
if (argc > 1) {
fname = argv[1];
}
if (fname == NULL || *fname == '\0')
fname = default_fname;
res = f_open(&File, fname, FA_READ );
if (res) {
printf_P(PSTR("Error: failed to open '%s'\n"), fname);
return CMD_RET_FAILURE;
}
printf_P(PSTR("Loading: '%s'...\n"), fname);
/* read the load record */
res = f_read(&File, buffer, RS, &br);
if (res || br != RS)
goto out;
mem_top = buffer[0] << 8;
res_len = buffer[1];
bank_top = buffer[2] << 8;
bank_len = buffer[3];
osentry_addr = buffer[4] + (buffer[5] << 8);
/* read display info */
res = f_read(&File, buffer, RS, &br);
if (res || br != RS)
goto out;
/* print the info */
buffer[RS-1] = '$';
uint8_t *p = memchr(buffer, '$', RS);
*p = '\0';
my_puts((char *)buffer);
if (common_base == 0) {
/* read common base
* http://www.seasip.info/Cpm/scb.html
*/
FSIZE_t common_base_ofs = ((res_len - 6) << 8) + 2*RS + RS-7;
FSIZE_t cur_pos = f_tell(&File);
if ((res = f_lseek(&File, common_base_ofs)) ||
(res = f_read(&File, buffer, 2, &br)) ||
(br != 2) ||
(res = f_lseek(&File, cur_pos)))
goto out;
common_base = (uint16_t) buffer[0] + (buffer[1] << 8);
setenv_hex(PSTR(ENV_CPM3_COMMON_BASE), common_base);
}
setenv_hex(PSTR(ENV_CPM3_SCB), mem_top - ((res_len - (6 - 1)) << 8) + common_base);
/* Main System Load */
/* Load Common Portion of System */
if ((res = load(&File, common_base + mem_top, res_len)) != 0)
goto out;
/* Load Banked Portion of System */
res = load(&File, banked_base + bank_top, bank_len);
out:
f_close(&File);
if (res) {
printf_P(PSTR("Error: failed to read '%s'\n"), fname);
return CMD_RET_FAILURE;
} else {
if (res_len != 0) {
if (osentry_addr + common_base > 0xffff) {
z80_bus_cmd(Request);
if (z80_read(osentry_addr + common_base) == 0xc3) {
osentry_addr = z80_read(osentry_addr+common_base+1) +
(z80_read(osentry_addr + common_base+2) << 8);
}
z80_bus_cmd(Release);
if (banked_base + osentry_addr > 0xffff)
osentry_addr = 0;
}
setenv_hex(PSTR(ENV_STARTADDRESS), osentry_addr);
}
printf_P(PSTR("Loaded: Resident: "));
if (res_len != 0)
printf_P(PSTR("0x%.5lX-0x%.5lX, "),
(common_base + mem_top) - res_len*256,
(common_base + mem_top) - 1);
else
printf_P(PSTR(" - "));
printf_P(PSTR("Banked: "));
if (bank_len != 0)
printf_P(PSTR("0x%.5lX-0x%.5lX\n"),
(banked_base + bank_top) - bank_len*256,
(banked_base + bank_top) - 1);
else
printf_P(PSTR(" - \n"));
return CMD_RET_SUCCESS;
}
}
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