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bootloader.c
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bootloader.c
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/* bootloader.h: deposit TU58 bootloader into monitor and start
*
* Copyright (c) 2017, Joerg Hoppe
* j_hoppe@t-online.de, www.retrocmp.com
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* 23-Mar-2017 JH created
*/
#define _BOOTLOADER_C_
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "error.h"
#include "main.h"
#include "serial.h"
#include "monitor.h"
#include "bootloader.h" // own
/* Assembler code of relocatable PDP-11 TU58 bootloader
* |
* |M9312 'DD' BOOT prom for TU58 D MACRO V05.05 Tuesday 23-Mar-99 00:02 Page 1
* |
* |
* | 1
* | 2 .title M9312 'DD' BOOT prom for TU58 DECtapeII serial tape controller (REVISED)
* | 3
* | 4 ; Original edition AK6DN Don North,
* | 5 ; Further processed JH
* | 6
* | 7 ; This source code is an M9312 boot PROM for the TU58 version 23-765B9.
* | 8 ;
* | 9 ; This boot PROM is for the TU58 DECtapeII serial tape controller.
* | 10 ;
* | 11 ; Multiple units and/or CSR addresses are supported via different entry points.
* | 12 ;
* | 13 ; Standard devices are 82S131, Am27S13, 74S571 or other compatible bipolar
* | 14 ; PROMs with a 512x4 TriState 16pin DIP architecture. This code resides in
* | 15 ; the low half of the device; the top half is blank and unused.
* | 16 ;
* | 17 ; Alternatively, 82S129 compatible 256x4 TriState 16pin DIP devices can be
* | 18 ; used, as the uppermost address line (hardwired low) is an active low chip
* | 19 ; select (and will be correctly asserted low).
* | 20
* | 21
* | 22 ;VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
* | 23 ;
* | 24 ; The original code in 23-765A9 is REALLY BROKEN when it comes to
* | 25 ; supporting a non-std CSR other than 776500 in R1 on entry
* | 26 ;
* | 27 ; All the hard references to: ddrbuf, ddxcsr, ddxbuf
* | 28 ; have been changed to: 2(R1), 4(R1), 6(R1)
* | 29 ;
* | 30 ; The one reference where 'ddrcsr' might have been used is '(R1)' instead
* | 31 ; which is actually correct (but totally inconsistent with other usage).
* | 32 ;
* | 33 ;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
* | 34
* | 35
* | 36 176500 ddcsr =176500 ; std TU58 csrbase
* | 37
* | 38 000000 ddrcsr =+0 ; receive control
* | 39 000002 ddrbuf =+2 ; receive data
* | 40 000004 ddxcsr =+4 ; transmit control
* | 41 000006 ddxbuf =+6 ; transmit data
* | 42
* | 43 000000 .asect
* | 44 010000 .=10000
* | 45
* | 46 ; --------------------------------------------------
* | 47
* | 48 010000 start:
* | 49
* | 50 010000 000261 dd0n: sec ; boot std csr, unit zero, no diags
* | 51 010002 012700 000000 dd0d: mov #0,r0 ; boot std csr, unit zero, with diags
* | 52 010006 012701 176500 ddNr: mov #ddcsr,r1 ; boot std csr, unit <R0>
* | 53
* | 54
* | 55 ; mov #101,r3 ; transmit A
* | 56 ; mov r3,@#176506
* | 57 ; halt
* | M9312 'DD' BOOT prom for TU58 D MACRO V05.05 Tuesday 23-Mar-99 00:02 Page 1-1
* |
* |
* | 58 ; call xmtch ; transmit unit number
* | 59 ; halt
* | 60 ; mov #132,r3 ; transmit A
* | 61 ; call xmtch ; transmit unit number
* | 62 ; halt
* | 63 010012 012706 002000 go: mov #2000,sp ; setup a stack
* | 64 010016 005004 clr r4 ; zap old return address
* | 65 010020 005261 000004 inc ddxcsr(r1) ; set break bit
* | 66 010024 005003 clr r3 ; data 000,000
* | 67 010026 004767 000050 call xmtch8 ; transmit 8 zero chars
* | 68 010032 005061 000004 clr ddxcsr(r1) ; clear break bit
* | 69 010036 005761 000002 tst ddrbuf(r1) ; read/flush any stale rx char
* | 70 010042 012703 004004 mov #<010*400>+004,r3 ; data 010,004
* | 71 010046 004767 000034 call xmtch2 ; transmit 004 (init) and 010 (boot)
* | 72 010052 010003 mov r0,r3 ; get unit number
* | 73 010054 004767 000030 call xmtch ; transmit unit number
* | 74
* | 75 010060 005003 clr r3 ; clear rx buffer ptr
* | 76 010062 105711 2$: tstb (r1) ; wait for rcv'd char available
* | 77 010064 100376 bpl 2$ ; br if not yet
* | 78 010066 116123 000002 movb ddrbuf(r1),(r3)+ ; store the char in buffer, bump ptr
* | 79 010072 022703 001000 cmp #1000,r3 ; hit end of buffer (512. bytes)?
* | 80 010076 101371 bhi 2$ ; br if not yet
* | 81
* | 82 ; halt
* | 83 010100 005007 clr pc ; jump to bootstrap at zero
* | 84
* | 85 010102 xmtch8: ; transmit 4x the two chars in r3
* | 86 010102 004717 jsr pc,(pc) ; recursive call for char replication
* | 87 010104 xmtch4:
* | 88 010104 004717 jsr pc,(pc) ; recursive call for char replication
* | 89 010106 xmtch2: ; transmit 2 chars in lower r3, upper r3
* | 90 010106 004717 jsr pc,(pc) ; recursive call for char replication
* | 91 010110 xmtch: ; xmt char in lower r3, then swap r3
* | 92 010110 105761 000004 tstb ddxcsr(r1) ; wait for xmit buffer available
* | 93 010114 100375 bpl xmtch ; br if not yet
* | 94 010116 110361 000006 movb r3,ddxbuf(r1) ; send the char
* | 95 010122 000303 swab r3 ; swap to other char
* | 96 010124 000207 return ; rts pc ; now recurse or return
* | 97
* | 98 000001 .end
* | M9312 'DD' BOOT prom for TU58 D MACRO V05.05 Tuesday 23-Mar-99 00:02 Page 1-2
* |Symbol table
* |
* |DDCSR = 176500 DDRCSR= 000000 DD0D 010002 START 010000 XMTCH4 010104
* |DDNR 010006 DDXBUF= 000006 DD0N 010000 XMTCH 010110 XMTCH8 010102
* |DDRBUF= 000002 DDXCSR= 000004 GO 010012 XMTCH2 010106
* |
* |. ABS. 010126 000 (RW,I,GBL,ABS,OVR)
* | 000000 001 (RW,I,LCL,REL,CON)
* |Errors detected: 0
* |
* |*** Assembler statistics
* |
* |
* |Work file reads: 0
* |Work file writes: 0
* |Size of work file: 48 Words ( 1 Pages)
* |Size of core pool: 15104 Words ( 59 Pages)
* |Operating system: RT-11
* |
* |Elapsed time: 00:00:09.30
* |DK:DDBOOT,DK:DDBOOT.LST=DK:DDBOOT
*/
/*** binary image of TU58 boot loader ***/
#define obj_code_word_count ((010124 - 010000)/2 + 1)
static uint16_t obj_code[obj_code_word_count] = { 0000261, 0012700, 0000000, 0012701, 0176500,
0012706, 0002000, 0005004, 0005261, 0000004, 0005003, 0004767, 0000050, 0005061,
0000004, 0005761, 0000002, 0012703, 0004004, 0004767, 0000034, 0010003, 0004767,
0000030, 0005003, 0105711, 0100376, 0116123, 0000002, 0022703, 0001000, 0101371,
0005007, 0004717, 0004717, 0004717, 0105761, 0000004, 0100375, 0110361, 0000006,
0000303, 0000207 };
void bootloader_show_code(FILE *fout, int opt_boot_address) {
unsigned i;
fprintf(fout, "# TU58 boot loader octal address/value dump\n");
// dump out address/value pairs
for (i = 0; i < obj_code_word_count; i++) {
unsigned addr = opt_boot_address + 2 * i;
unsigned value = obj_code[i];
fprintf(fout, "%06o %06o\n", addr, value);
}
fprintf(fout, "\n");
}
/*
* Download object code over monitor into PDP-11
*/
int bootloader_download(serial_device_t *serialdevice, monitor_type_t monitor_type,
int opt_boot_address) {
monitor_t monitor;
unsigned i;
if (monitor_init(&monitor, serialdevice, monitor_type, stdout, opt_usbdelay))
return error_set(ERROR_MONITOR, "monitor_init in bootloader_download");
if (monitor_assert_prompt(&monitor))
return error_set(ERROR_MONITOR,
"Boot loader download: PDP-11 console prompt not found.");
// dump out address/value pairs
for (i = 0; i < obj_code_word_count; i++) {
unsigned addr = opt_boot_address + 2 * i;
unsigned value = obj_code[i];
if (monitor_deposit(&monitor, addr, value))
return error_set(ERROR_MONITOR, "bootloader_download");
}
//monitor_trace_dump(stderr) ; //debug
monitor_close(&monitor);
return ERROR_OK;
}
/*
* Start execution of monitor code
*/
int bootloader_go(serial_device_t *serialdevice, monitor_type_t monitor_type, int boot_address) {
monitor_t monitor;
if (monitor_init(&monitor, serialdevice, monitor_type, stdout, opt_usbdelay))
return error_set(ERROR_MONITOR, "monitor_init in bootloader_go");
if (monitor_assert_prompt(&monitor))
return error_set(ERROR_MONITOR, "monitor_assert_prompt in bootloader_go");
if (monitor_go(&monitor, boot_address, 0))
return error_set(ERROR_MONITOR, "monitor_go in bootloader_go");
return ERROR_OK;
}
/* primitive teletype:
* User "keyboard" input from stdin, display to stdout,
* Interface to PDP-11 over pre-initialized "serialdevice".
* Exit
*/
int run_teletype(serial_device_t *serialdevice, monitor_type_t monitor_type, char *userinfo) {
#define EXITKEY1 0x01
#define EXITKEY2 0x01
monitor_t monitor;
int ready = 0;
int exitkey1_typed = 0; // 1 if 1st exit hotkey typed
// no user echo to stdout by monitor_*() functions
if (monitor_init(&monitor, serialdevice, monitor_type, NULL, opt_usbdelay))
return error_set(ERROR_MONITOR, "monitor_init in teletype");
// console is in RAW mode: so do own CR LF
fprintf(stdout, "\r\nTU58FS: teletype session to PDP-11 console opened.\r\n");
fprintf(stdout, "TU58FS: ^G sound is shown as \"<BEL>\"\r\n");
fprintf(stdout, "TU58FS: Terminate teletype session with ^A ^A double key sequence.\r\n");
if (userinfo)
fprintf(stdout, "TU58FS: %s\r\n", userinfo);
while (!ready) {
int status;
fd_set readfds;
struct timeval timeout;
/*
* 1. read char from PDP, echo to user
*/
char *s = monitor_gets(&monitor, 0);
if (s && strlen(s)) {
// show unprocessed on Linux console
fputs(s, stdout);
fflush(stdout);
}
/*
* 2. if user keyboard input, xmt to PDP-11 and check for exit hot key
*/
// http://stackoverflow.com/questions/26948723/checking-the-stdin-buffer-if-its-empty
FD_ZERO(&readfds);
FD_SET(STDIN_FILENO, &readfds);
timeout.tv_sec = timeout.tv_usec = 0; // zero timeout, just poll
status = select(1, &readfds, NULL, NULL, &timeout); // rtfm
if (status < 0) {
error_set(ERROR_TTY, "Teletype keyboard polling, errno=%u", errno);
} else if (status > 0) {
// single char input!
char c = getchar();
// test for exit hotkey sequence
if (exitkey1_typed && c == EXITKEY2) {
// terminate
ready = 1;
} else if (!exitkey1_typed && c == EXITKEY1) {
exitkey1_typed = 1;
// do not echo to PDP
} else {
char buff[10];
exitkey1_typed = 0;
if (c == 0x07)
strcpy(buff, "<BEL>");
else {
// char in buff[0], send it to PDP.
buff[0] = c;
buff[1] = 0; // char -> string
}
monitor_puts(&monitor, buff);
}
}
}
monitor_close(&monitor);
fprintf(stdout, "\r\nTU58FS: teletype session closed.\r\n");
return ERROR_OK;
}