1 /* ----------------------------------------------------------------------- *
3 * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330,
8 * Boston MA 02111-1307, USA; either version 2 of the License, or
9 * (at your option) any later version; incorporated herein by reference.
11 * ----------------------------------------------------------------------- */
22 const char *program = "memdump";
24 void __attribute__ ((noreturn)) die(const char *msg)
34 # define dprintf printf
36 # define dprintf(...) ((void)0)
39 static inline __attribute__ ((const))
43 asm("movw %%ds,%0":"=rm"(v));
47 #define GDT_ENTRY(flags,base,limit) \
48 (((uint64_t)(base & 0xff000000) << 32) | \
49 ((uint64_t)flags << 40) | \
50 ((uint64_t)(limit & 0x00ff0000) << 32) | \
51 ((uint64_t)(base & 0x00ffff00) << 16) | \
52 ((uint64_t)(limit & 0x0000ffff)))
54 static void get_bytes(void *buf, size_t len, struct file_info *finfo,
58 static uint64_t gdt[6];
61 pos += (size_t) finfo->pvt; /* Add base */
64 if (end <= 0x100000) {
65 /* Can stay in real mode */
66 asm volatile ("movw %3,%%fs ; "
69 "rep; movsb"::"D" (buf), "c"(len >> 2),
70 "r"((uint16_t) (len & 3)), "rm"((uint16_t) (pos >> 4)),
74 bufl = (ds() << 4) + (size_t) buf;
75 gdt[2] = GDT_ENTRY(0x0093, pos, 0xffff);
76 gdt[3] = GDT_ENTRY(0x0093, bufl, 0xffff);
77 asm volatile ("pushal ; int $0x15 ; popal"::"a" (0x8700),
78 "c"((len + 1) >> 1), "S"(&gdt)
83 int main(int argc, char *argv[])
85 uint16_t bios_ports[4];
89 static struct serial_if sif = {
91 .write = serial_write,
93 struct file_info finfo;
94 const char ymodem_banner[] = "Now begin Ymodem download...\r\n";
97 if (argv[1][0] == '-') {
98 srec = argv[1][1] == 's';
104 die("usage: memdump [-s] port prefix start,len...");
106 finfo.pvt = (void *)0x400;
107 get_bytes(bios_ports, 8, &finfo, 0); /* Get BIOS serial ports */
109 for (i = 0; i < 4; i++)
110 printf("ttyS%i (COM%i) is at %#x\n", i, i + 1, bios_ports[i]);
112 sif.port = strtoul(argv[1], NULL, 0);
114 sif.port = bios_ports[sif.port];
117 if (serial_init(&sif))
118 die("failed to initialize serial port");
123 puts("Printing prefix...\n");
124 sif.write(&sif, ymodem_banner, sizeof ymodem_banner - 1);
127 for (i = 3; i < argc; i++) {
131 start = strtoul(argv[i], &ep, 0);
133 die("invalid range specification");
134 len = strtoul(ep + 1, NULL, 0);
136 sprintf(filename, "%s%#x-%#x.bin", prefix, start, len);
137 finfo.name = filename;
139 finfo.pvt = (void *)start;
146 send_srec(&sif, &finfo, get_bytes);
148 send_ymodem(&sif, &finfo, get_bytes);
152 puts("Sending closing signature...\n");