13e4415a7SThomas Huth /* 23e4415a7SThomas Huth * S390 virtio-ccw network boot loading program 33e4415a7SThomas Huth * 43e4415a7SThomas Huth * Copyright 2017 Thomas Huth, Red Hat Inc. 53e4415a7SThomas Huth * 63e4415a7SThomas Huth * Based on the S390 virtio-ccw loading program (main.c) 73e4415a7SThomas Huth * Copyright (c) 2013 Alexander Graf <agraf@suse.de> 83e4415a7SThomas Huth * 929d12216SThomas Huth * And based on the network loading code from SLOF (netload.c) 1029d12216SThomas Huth * Copyright (c) 2004, 2008 IBM Corporation 1129d12216SThomas Huth * 123e4415a7SThomas Huth * This code is free software; you can redistribute it and/or modify it 133e4415a7SThomas Huth * under the terms of the GNU General Public License as published by the 143e4415a7SThomas Huth * Free Software Foundation; either version 2 of the License, or (at your 153e4415a7SThomas Huth * option) any later version. 163e4415a7SThomas Huth */ 173e4415a7SThomas Huth 183e4415a7SThomas Huth #include <stdint.h> 193e4415a7SThomas Huth #include <stdbool.h> 203e4415a7SThomas Huth #include <stdio.h> 213e4415a7SThomas Huth #include <stdlib.h> 223e4415a7SThomas Huth #include <string.h> 233e4415a7SThomas Huth #include <unistd.h> 2429d12216SThomas Huth 2529d12216SThomas Huth #include <tftp.h> 2629d12216SThomas Huth #include <ethernet.h> 2729d12216SThomas Huth #include <dhcp.h> 2829d12216SThomas Huth #include <dhcpv6.h> 2929d12216SThomas Huth #include <ipv4.h> 3029d12216SThomas Huth #include <ipv6.h> 3129d12216SThomas Huth #include <dns.h> 323e4415a7SThomas Huth #include <time.h> 33ec623990SThomas Huth #include <pxelinux.h> 343e4415a7SThomas Huth 353e4415a7SThomas Huth #include "s390-ccw.h" 36120d0410SJason J. Herne #include "cio.h" 373e4415a7SThomas Huth #include "virtio.h" 38*e70bc57bSJanosch Frank #include "s390-time.h" 393e4415a7SThomas Huth 4029d12216SThomas Huth #define DEFAULT_BOOT_RETRIES 10 4129d12216SThomas Huth #define DEFAULT_TFTP_RETRIES 20 4229d12216SThomas Huth 433e4415a7SThomas Huth extern char _start[]; 449bfc04f9SJanosch Frank void write_iplb_location(void) {} 453e4415a7SThomas Huth 46c4942ee9SThomas Huth #define KERNEL_ADDR ((void *)0L) 47c4942ee9SThomas Huth #define KERNEL_MAX_SIZE ((long)_start) 48ec623990SThomas Huth #define ARCH_COMMAND_LINE_SIZE 896 /* Taken from Linux kernel */ 49c4942ee9SThomas Huth 500d8261b5SThomas Huth /* STSI 3.2.2 offset of first vmdb + offset of uuid inside vmdb */ 510d8261b5SThomas Huth #define STSI322_VMDB_UUID_OFFSET ((8 + 12) * 4) 520d8261b5SThomas Huth 533e4415a7SThomas Huth char stack[PAGE_SIZE * 8] __attribute__((aligned(PAGE_SIZE))); 543e4415a7SThomas Huth IplParameterBlock iplb __attribute__((aligned(PAGE_SIZE))); 55c4942ee9SThomas Huth static char cfgbuf[2048]; 563e4415a7SThomas Huth 573e4415a7SThomas Huth static SubChannelId net_schid = { .one = 1 }; 58ec623990SThomas Huth static uint8_t mac[6]; 593e4415a7SThomas Huth static uint64_t dest_timer; 603e4415a7SThomas Huth 613e4415a7SThomas Huth void set_timer(int val) 623e4415a7SThomas Huth { 63*e70bc57bSJanosch Frank dest_timer = get_time_ms() + val; 643e4415a7SThomas Huth } 653e4415a7SThomas Huth 663e4415a7SThomas Huth int get_timer(void) 673e4415a7SThomas Huth { 68*e70bc57bSJanosch Frank return dest_timer - get_time_ms(); 693e4415a7SThomas Huth } 703e4415a7SThomas Huth 713e4415a7SThomas Huth int get_sec_ticks(void) 723e4415a7SThomas Huth { 733e4415a7SThomas Huth return 1000; /* number of ticks in 1 second */ 743e4415a7SThomas Huth } 753e4415a7SThomas Huth 7629d12216SThomas Huth /** 7729d12216SThomas Huth * Obtain IP and configuration info from DHCP server (either IPv4 or IPv6). 7829d12216SThomas Huth * @param fn_ip contains the following configuration information: 7929d12216SThomas Huth * client MAC, client IP, TFTP-server MAC, TFTP-server IP, 8029d12216SThomas Huth * boot file name 8129d12216SThomas Huth * @param retries Number of DHCP attempts 8229d12216SThomas Huth * @return 0 : IP and configuration info obtained; 8329d12216SThomas Huth * non-0 : error condition occurred. 8429d12216SThomas Huth */ 8529d12216SThomas Huth static int dhcp(struct filename_ip *fn_ip, int retries) 8629d12216SThomas Huth { 8729d12216SThomas Huth int i = retries + 1; 8829d12216SThomas Huth int rc = -1; 8929d12216SThomas Huth 9029d12216SThomas Huth printf(" Requesting information via DHCP: "); 9129d12216SThomas Huth 9229d12216SThomas Huth dhcpv4_generate_transaction_id(); 9329d12216SThomas Huth dhcpv6_generate_transaction_id(); 9429d12216SThomas Huth 9529d12216SThomas Huth do { 9629d12216SThomas Huth printf("\b\b\b%03d", i - 1); 9729d12216SThomas Huth if (!--i) { 9829d12216SThomas Huth printf("\nGiving up after %d DHCP requests\n", retries); 9929d12216SThomas Huth return -1; 10029d12216SThomas Huth } 101134f0b3dSThomas Huth fn_ip->ip_version = 4; 10229d12216SThomas Huth rc = dhcpv4(NULL, fn_ip); 10329d12216SThomas Huth if (rc == -1) { 104134f0b3dSThomas Huth fn_ip->ip_version = 6; 10529d12216SThomas Huth set_ipv6_address(fn_ip->fd, 0); 10629d12216SThomas Huth rc = dhcpv6(NULL, fn_ip); 10729d12216SThomas Huth if (rc == 0) { 10829d12216SThomas Huth memcpy(&fn_ip->own_ip6, get_ipv6_address(), 16); 10929d12216SThomas Huth break; 11029d12216SThomas Huth } 11129d12216SThomas Huth } 11229d12216SThomas Huth if (rc != -1) { /* either success or non-dhcp failure */ 11329d12216SThomas Huth break; 11429d12216SThomas Huth } 11529d12216SThomas Huth } while (1); 11629d12216SThomas Huth printf("\b\b\b\bdone\n"); 11729d12216SThomas Huth 11829d12216SThomas Huth return rc; 11929d12216SThomas Huth } 12029d12216SThomas Huth 12129d12216SThomas Huth /** 12229d12216SThomas Huth * Seed the random number generator with our mac and current timestamp 12329d12216SThomas Huth */ 12429d12216SThomas Huth static void seed_rng(uint8_t mac[]) 12529d12216SThomas Huth { 12629d12216SThomas Huth uint64_t seed; 12729d12216SThomas Huth 12829d12216SThomas Huth asm volatile(" stck %0 " : : "Q"(seed) : "memory"); 12929d12216SThomas Huth seed ^= (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]; 13029d12216SThomas Huth srand(seed); 13129d12216SThomas Huth } 13229d12216SThomas Huth 1330c188229SThomas Huth static int tftp_load(filename_ip_t *fnip, void *buffer, int len) 13429d12216SThomas Huth { 13529d12216SThomas Huth tftp_err_t tftp_err; 13629d12216SThomas Huth int rc; 13729d12216SThomas Huth 138134f0b3dSThomas Huth rc = tftp(fnip, buffer, len, DEFAULT_TFTP_RETRIES, &tftp_err); 13929d12216SThomas Huth 140c4942ee9SThomas Huth if (rc < 0) { 141c4942ee9SThomas Huth /* Make sure that error messages are put into a new line */ 142c4942ee9SThomas Huth printf("\n "); 143c4942ee9SThomas Huth } 144c4942ee9SThomas Huth 145c4942ee9SThomas Huth if (rc > 1024) { 146c4942ee9SThomas Huth printf(" TFTP: Received %s (%d KBytes)\n", fnip->filename, rc / 1024); 147c4942ee9SThomas Huth } else if (rc > 0) { 148c4942ee9SThomas Huth printf(" TFTP: Received %s (%d Bytes)\n", fnip->filename, rc); 149134f0b3dSThomas Huth } else { 150134f0b3dSThomas Huth const char *errstr = NULL; 151134f0b3dSThomas Huth int ecode; 152134f0b3dSThomas Huth tftp_get_error_info(fnip, &tftp_err, rc, &errstr, &ecode); 153134f0b3dSThomas Huth printf("TFTP error: %s\n", errstr ? errstr : "unknown error"); 15429d12216SThomas Huth } 15529d12216SThomas Huth 15629d12216SThomas Huth return rc; 15729d12216SThomas Huth } 15829d12216SThomas Huth 1590c188229SThomas Huth static int net_init(filename_ip_t *fn_ip) 16029d12216SThomas Huth { 16129d12216SThomas Huth int rc; 16229d12216SThomas Huth 1630c188229SThomas Huth memset(fn_ip, 0, sizeof(filename_ip_t)); 16429d12216SThomas Huth 16529d12216SThomas Huth rc = virtio_net_init(mac); 16629d12216SThomas Huth if (rc < 0) { 16729d12216SThomas Huth puts("Could not initialize network device"); 16829d12216SThomas Huth return -101; 16929d12216SThomas Huth } 1700c188229SThomas Huth fn_ip->fd = rc; 17129d12216SThomas Huth 17229d12216SThomas Huth printf(" Using MAC address: %02x:%02x:%02x:%02x:%02x:%02x\n", 17329d12216SThomas Huth mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); 17429d12216SThomas Huth 17529d12216SThomas Huth set_mac_address(mac); /* init ethernet layer */ 17629d12216SThomas Huth seed_rng(mac); 17729d12216SThomas Huth 1780c188229SThomas Huth rc = dhcp(fn_ip, DEFAULT_BOOT_RETRIES); 17929d12216SThomas Huth if (rc >= 0) { 180134f0b3dSThomas Huth if (fn_ip->ip_version == 4) { 1810c188229SThomas Huth set_ipv4_address(fn_ip->own_ip); 18229d12216SThomas Huth } 18329d12216SThomas Huth } else { 18429d12216SThomas Huth puts("Could not get IP address"); 18529d12216SThomas Huth return -101; 18629d12216SThomas Huth } 18729d12216SThomas Huth 188134f0b3dSThomas Huth if (fn_ip->ip_version == 4) { 18929d12216SThomas Huth printf(" Using IPv4 address: %d.%d.%d.%d\n", 1900c188229SThomas Huth (fn_ip->own_ip >> 24) & 0xFF, (fn_ip->own_ip >> 16) & 0xFF, 1910c188229SThomas Huth (fn_ip->own_ip >> 8) & 0xFF, fn_ip->own_ip & 0xFF); 192134f0b3dSThomas Huth } else if (fn_ip->ip_version == 6) { 19329d12216SThomas Huth char ip6_str[40]; 1940c188229SThomas Huth ipv6_to_str(fn_ip->own_ip6.addr, ip6_str); 19529d12216SThomas Huth printf(" Using IPv6 address: %s\n", ip6_str); 19629d12216SThomas Huth } 19729d12216SThomas Huth 19829d12216SThomas Huth if (rc == -2) { 19929d12216SThomas Huth printf("ARP request to TFTP server (%d.%d.%d.%d) failed\n", 2000c188229SThomas Huth (fn_ip->server_ip >> 24) & 0xFF, (fn_ip->server_ip >> 16) & 0xFF, 2010c188229SThomas Huth (fn_ip->server_ip >> 8) & 0xFF, fn_ip->server_ip & 0xFF); 20229d12216SThomas Huth return -102; 20329d12216SThomas Huth } 20429d12216SThomas Huth if (rc == -4 || rc == -3) { 20529d12216SThomas Huth puts("Can't obtain TFTP server IP address"); 20629d12216SThomas Huth return -107; 20729d12216SThomas Huth } 20829d12216SThomas Huth 2090c188229SThomas Huth printf(" Using TFTP server: "); 210134f0b3dSThomas Huth if (fn_ip->ip_version == 4) { 2110c188229SThomas Huth printf("%d.%d.%d.%d\n", 2120c188229SThomas Huth (fn_ip->server_ip >> 24) & 0xFF, (fn_ip->server_ip >> 16) & 0xFF, 2130c188229SThomas Huth (fn_ip->server_ip >> 8) & 0xFF, fn_ip->server_ip & 0xFF); 214134f0b3dSThomas Huth } else if (fn_ip->ip_version == 6) { 21529d12216SThomas Huth char ip6_str[40]; 2160c188229SThomas Huth ipv6_to_str(fn_ip->server_ip6.addr, ip6_str); 21729d12216SThomas Huth printf("%s\n", ip6_str); 21829d12216SThomas Huth } 21929d12216SThomas Huth 220134f0b3dSThomas Huth if (strlen(fn_ip->filename) > 0) { 2210c188229SThomas Huth printf(" Bootfile name: '%s'\n", fn_ip->filename); 22229d12216SThomas Huth } 22329d12216SThomas Huth 22429d12216SThomas Huth return rc; 22529d12216SThomas Huth } 22629d12216SThomas Huth 2270c188229SThomas Huth static void net_release(filename_ip_t *fn_ip) 2280c188229SThomas Huth { 229134f0b3dSThomas Huth if (fn_ip->ip_version == 4) { 2300c188229SThomas Huth dhcp_send_release(fn_ip->fd); 2310c188229SThomas Huth } 2320c188229SThomas Huth } 2330c188229SThomas Huth 234c4942ee9SThomas Huth /** 2350d8261b5SThomas Huth * Retrieve the Universally Unique Identifier of the VM. 2360d8261b5SThomas Huth * @return UUID string, or NULL in case of errors 2370d8261b5SThomas Huth */ 2380d8261b5SThomas Huth static const char *get_uuid(void) 2390d8261b5SThomas Huth { 2400d8261b5SThomas Huth register int r0 asm("0"); 2410d8261b5SThomas Huth register int r1 asm("1"); 2420d8261b5SThomas Huth uint8_t *mem, *buf, uuid[16]; 2430d8261b5SThomas Huth int i, cc, chk = 0; 2440d8261b5SThomas Huth static char uuid_str[37]; 2450d8261b5SThomas Huth 2460d8261b5SThomas Huth mem = malloc(2 * PAGE_SIZE); 2470d8261b5SThomas Huth if (!mem) { 2480d8261b5SThomas Huth puts("Out of memory ... can not get UUID."); 2490d8261b5SThomas Huth return NULL; 2500d8261b5SThomas Huth } 2510d8261b5SThomas Huth buf = (uint8_t *)(((uint64_t)mem + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 2520d8261b5SThomas Huth memset(buf, 0, PAGE_SIZE); 2530d8261b5SThomas Huth 2540d8261b5SThomas Huth /* Get SYSIB 3.2.2 */ 2550d8261b5SThomas Huth r0 = (3 << 28) | 2; 2560d8261b5SThomas Huth r1 = 2; 2570d8261b5SThomas Huth asm volatile(" stsi 0(%[addr])\n" 2580d8261b5SThomas Huth " ipm %[cc]\n" 2590d8261b5SThomas Huth " srl %[cc],28\n" 2600d8261b5SThomas Huth : [cc] "=d" (cc) 2610d8261b5SThomas Huth : "d" (r0), "d" (r1), [addr] "a" (buf) 2620d8261b5SThomas Huth : "cc", "memory"); 2630d8261b5SThomas Huth if (cc) { 26409be82ceSYifan Luo free(mem); 2650d8261b5SThomas Huth return NULL; 2660d8261b5SThomas Huth } 2670d8261b5SThomas Huth 2680d8261b5SThomas Huth for (i = 0; i < 16; i++) { 2690d8261b5SThomas Huth uuid[i] = buf[STSI322_VMDB_UUID_OFFSET + i]; 2700d8261b5SThomas Huth chk |= uuid[i]; 2710d8261b5SThomas Huth } 2720d8261b5SThomas Huth free(mem); 2730d8261b5SThomas Huth if (!chk) { 2740d8261b5SThomas Huth return NULL; 2750d8261b5SThomas Huth } 2760d8261b5SThomas Huth 2770d8261b5SThomas Huth sprintf(uuid_str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" 2780d8261b5SThomas Huth "%02x%02x%02x%02x%02x%02x", uuid[0], uuid[1], uuid[2], uuid[3], 2790d8261b5SThomas Huth uuid[4], uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], 2800d8261b5SThomas Huth uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]); 2810d8261b5SThomas Huth 2820d8261b5SThomas Huth return uuid_str; 2830d8261b5SThomas Huth } 2840d8261b5SThomas Huth 2850d8261b5SThomas Huth /** 286ec623990SThomas Huth * Load a kernel with initrd (i.e. with the information that we've got from 287ec623990SThomas Huth * a pxelinux.cfg config file) 288ec623990SThomas Huth */ 289ec623990SThomas Huth static int load_kernel_with_initrd(filename_ip_t *fn_ip, 290ec623990SThomas Huth struct pl_cfg_entry *entry) 291ec623990SThomas Huth { 292ec623990SThomas Huth int rc; 293ec623990SThomas Huth 294ec623990SThomas Huth printf("Loading pxelinux.cfg entry '%s'\n", entry->label); 295ec623990SThomas Huth 296ec623990SThomas Huth if (!entry->kernel) { 297ec623990SThomas Huth printf("Kernel entry is missing!\n"); 298ec623990SThomas Huth return -1; 299ec623990SThomas Huth } 300ec623990SThomas Huth 301ec623990SThomas Huth strncpy(fn_ip->filename, entry->kernel, sizeof(fn_ip->filename)); 302ec623990SThomas Huth rc = tftp_load(fn_ip, KERNEL_ADDR, KERNEL_MAX_SIZE); 303ec623990SThomas Huth if (rc < 0) { 304ec623990SThomas Huth return rc; 305ec623990SThomas Huth } 306ec623990SThomas Huth 307ec623990SThomas Huth if (entry->initrd) { 308ec623990SThomas Huth uint64_t iaddr = (rc + 0xfff) & ~0xfffUL; 309ec623990SThomas Huth 310ec623990SThomas Huth strncpy(fn_ip->filename, entry->initrd, sizeof(fn_ip->filename)); 311ec623990SThomas Huth rc = tftp_load(fn_ip, (void *)iaddr, KERNEL_MAX_SIZE - iaddr); 312ec623990SThomas Huth if (rc < 0) { 313ec623990SThomas Huth return rc; 314ec623990SThomas Huth } 315ec623990SThomas Huth /* Patch location and size: */ 316ec623990SThomas Huth *(uint64_t *)0x10408 = iaddr; 317ec623990SThomas Huth *(uint64_t *)0x10410 = rc; 318ec623990SThomas Huth rc += iaddr; 319ec623990SThomas Huth } 320ec623990SThomas Huth 321ec623990SThomas Huth if (entry->append) { 322ec623990SThomas Huth strncpy((char *)0x10480, entry->append, ARCH_COMMAND_LINE_SIZE); 323ec623990SThomas Huth } 324ec623990SThomas Huth 325ec623990SThomas Huth return rc; 326ec623990SThomas Huth } 327ec623990SThomas Huth 328ec623990SThomas Huth #define MAX_PXELINUX_ENTRIES 16 329ec623990SThomas Huth 330ec623990SThomas Huth static int net_try_pxelinux_cfg(filename_ip_t *fn_ip) 331ec623990SThomas Huth { 332ec623990SThomas Huth struct pl_cfg_entry entries[MAX_PXELINUX_ENTRIES]; 333ec623990SThomas Huth int num_ent, def_ent = 0; 334ec623990SThomas Huth 3350d8261b5SThomas Huth num_ent = pxelinux_load_parse_cfg(fn_ip, mac, get_uuid(), 3360d8261b5SThomas Huth DEFAULT_TFTP_RETRIES, 337ec623990SThomas Huth cfgbuf, sizeof(cfgbuf), 338ec623990SThomas Huth entries, MAX_PXELINUX_ENTRIES, &def_ent); 339ec623990SThomas Huth if (num_ent > 0) { 340ec623990SThomas Huth return load_kernel_with_initrd(fn_ip, &entries[def_ent]); 341ec623990SThomas Huth } 342ec623990SThomas Huth 343ec623990SThomas Huth return -1; 344ec623990SThomas Huth } 345ec623990SThomas Huth 346ec623990SThomas Huth /** 347c4942ee9SThomas Huth * Load via information from a .INS file (which can be found on CD-ROMs 348c4942ee9SThomas Huth * for example) 349c4942ee9SThomas Huth */ 350c4942ee9SThomas Huth static int handle_ins_cfg(filename_ip_t *fn_ip, char *cfg, int cfgsize) 351c4942ee9SThomas Huth { 352c4942ee9SThomas Huth char *ptr; 353c4942ee9SThomas Huth int rc = -1, llen; 354c4942ee9SThomas Huth void *destaddr; 355c4942ee9SThomas Huth char *insbuf = cfg; 356c4942ee9SThomas Huth 357c4942ee9SThomas Huth ptr = strchr(insbuf, '\n'); 358c4942ee9SThomas Huth if (!ptr) { 359c4942ee9SThomas Huth puts("Does not seem to be a valid .INS file"); 360c4942ee9SThomas Huth return -1; 361c4942ee9SThomas Huth } 362c4942ee9SThomas Huth 363c4942ee9SThomas Huth *ptr = 0; 364c4942ee9SThomas Huth printf("\nParsing .INS file:\n %s\n", &insbuf[2]); 365c4942ee9SThomas Huth 366c4942ee9SThomas Huth insbuf = ptr + 1; 367c4942ee9SThomas Huth while (*insbuf && insbuf < cfg + cfgsize) { 368c4942ee9SThomas Huth ptr = strchr(insbuf, '\n'); 369c4942ee9SThomas Huth if (ptr) { 370c4942ee9SThomas Huth *ptr = 0; 371c4942ee9SThomas Huth } 372c4942ee9SThomas Huth llen = strlen(insbuf); 373c4942ee9SThomas Huth if (!llen) { 374c4942ee9SThomas Huth insbuf = ptr + 1; 375c4942ee9SThomas Huth continue; 376c4942ee9SThomas Huth } 377c4942ee9SThomas Huth ptr = strchr(insbuf, ' '); 378c4942ee9SThomas Huth if (!ptr) { 379c4942ee9SThomas Huth puts("Missing space separator in .INS file"); 380c4942ee9SThomas Huth return -1; 381c4942ee9SThomas Huth } 382c4942ee9SThomas Huth *ptr = 0; 383134f0b3dSThomas Huth strncpy(fn_ip->filename, insbuf, sizeof(fn_ip->filename)); 384c4942ee9SThomas Huth destaddr = (char *)atol(ptr + 1); 385c4942ee9SThomas Huth rc = tftp_load(fn_ip, destaddr, (long)_start - (long)destaddr); 386c4942ee9SThomas Huth if (rc <= 0) { 387c4942ee9SThomas Huth break; 388c4942ee9SThomas Huth } 389c4942ee9SThomas Huth insbuf += llen + 1; 390c4942ee9SThomas Huth } 391c4942ee9SThomas Huth 392c4942ee9SThomas Huth return rc; 393c4942ee9SThomas Huth } 394c4942ee9SThomas Huth 395c4942ee9SThomas Huth static int net_try_direct_tftp_load(filename_ip_t *fn_ip) 396c4942ee9SThomas Huth { 397c4942ee9SThomas Huth int rc; 398c4942ee9SThomas Huth void *loadaddr = (void *)0x2000; /* Load right after the low-core */ 399c4942ee9SThomas Huth 400c4942ee9SThomas Huth rc = tftp_load(fn_ip, loadaddr, KERNEL_MAX_SIZE - (long)loadaddr); 401c4942ee9SThomas Huth if (rc < 0) { 402c4942ee9SThomas Huth return rc; 403c4942ee9SThomas Huth } else if (rc < 8) { 404c4942ee9SThomas Huth printf("'%s' is too small (%i bytes only).\n", fn_ip->filename, rc); 405c4942ee9SThomas Huth return -1; 406c4942ee9SThomas Huth } 407c4942ee9SThomas Huth 408c4942ee9SThomas Huth /* Check whether it is a configuration file instead of a kernel */ 409c4942ee9SThomas Huth if (rc < sizeof(cfgbuf) - 1) { 410c4942ee9SThomas Huth memcpy(cfgbuf, loadaddr, rc); 411c4942ee9SThomas Huth cfgbuf[rc] = 0; /* Make sure that it is NUL-terminated */ 412c4942ee9SThomas Huth if (!strncmp("* ", cfgbuf, 2)) { 413c4942ee9SThomas Huth return handle_ins_cfg(fn_ip, cfgbuf, rc); 414c4942ee9SThomas Huth } 415ec623990SThomas Huth /* 416ec623990SThomas Huth * pxelinux.cfg support via bootfile name is just here for developers' 417ec623990SThomas Huth * convenience (it eases testing with the built-in DHCP server of QEMU 418ec623990SThomas Huth * that does not support RFC 5071). The official way to configure a 419ec623990SThomas Huth * pxelinux.cfg file name is to use DHCP options 209 and 210 instead. 420ec623990SThomas Huth * So only use the pxelinux.cfg parser here for files that start with 421ec623990SThomas Huth * a magic comment string. 422ec623990SThomas Huth */ 423ec623990SThomas Huth if (!strncasecmp("# pxelinux", cfgbuf, 10)) { 424ec623990SThomas Huth struct pl_cfg_entry entries[MAX_PXELINUX_ENTRIES]; 425ec623990SThomas Huth int num_ent, def_ent = 0; 426ec623990SThomas Huth 427ec623990SThomas Huth num_ent = pxelinux_parse_cfg(cfgbuf, sizeof(cfgbuf), entries, 428ec623990SThomas Huth MAX_PXELINUX_ENTRIES, &def_ent); 429ec623990SThomas Huth if (num_ent <= 0) { 430ec623990SThomas Huth return -1; 431ec623990SThomas Huth } 432ec623990SThomas Huth return load_kernel_with_initrd(fn_ip, &entries[def_ent]); 433ec623990SThomas Huth } 434c4942ee9SThomas Huth } 435c4942ee9SThomas Huth 436c4942ee9SThomas Huth /* Move kernel to right location */ 437c4942ee9SThomas Huth memmove(KERNEL_ADDR, loadaddr, rc); 438c4942ee9SThomas Huth 439c4942ee9SThomas Huth return rc; 440c4942ee9SThomas Huth } 441c4942ee9SThomas Huth 4423e4415a7SThomas Huth void panic(const char *string) 4433e4415a7SThomas Huth { 4443e4415a7SThomas Huth sclp_print(string); 4453e4415a7SThomas Huth for (;;) { 4463e4415a7SThomas Huth disabled_wait(); 4473e4415a7SThomas Huth } 4483e4415a7SThomas Huth } 4493e4415a7SThomas Huth 4509a848adfSThomas Huth void write_subsystem_identification(void) 4519a848adfSThomas Huth { 4529a848adfSThomas Huth SubChannelId *schid = (SubChannelId *) 184; 4539a848adfSThomas Huth uint32_t *zeroes = (uint32_t *) 188; 4549a848adfSThomas Huth 4559a848adfSThomas Huth *schid = net_schid; 4569a848adfSThomas Huth *zeroes = 0; 4579a848adfSThomas Huth } 4589a848adfSThomas Huth 4593e4415a7SThomas Huth static bool find_net_dev(Schib *schib, int dev_no) 4603e4415a7SThomas Huth { 4613e4415a7SThomas Huth int i, r; 4623e4415a7SThomas Huth 4633e4415a7SThomas Huth for (i = 0; i < 0x10000; i++) { 4643e4415a7SThomas Huth net_schid.sch_no = i; 4653e4415a7SThomas Huth r = stsch_err(net_schid, schib); 4663e4415a7SThomas Huth if (r == 3 || r == -EIO) { 4673e4415a7SThomas Huth break; 4683e4415a7SThomas Huth } 4693e4415a7SThomas Huth if (!schib->pmcw.dnv) { 4703e4415a7SThomas Huth continue; 4713e4415a7SThomas Huth } 4723668cb7cSJason J. Herne enable_subchannel(net_schid); 4733e4415a7SThomas Huth if (!virtio_is_supported(net_schid)) { 4743e4415a7SThomas Huth continue; 4753e4415a7SThomas Huth } 4763e4415a7SThomas Huth if (virtio_get_device_type() != VIRTIO_ID_NET) { 4773e4415a7SThomas Huth continue; 4783e4415a7SThomas Huth } 4793e4415a7SThomas Huth if (dev_no < 0 || schib->pmcw.dev == dev_no) { 4803e4415a7SThomas Huth return true; 4813e4415a7SThomas Huth } 4823e4415a7SThomas Huth } 4833e4415a7SThomas Huth 4843e4415a7SThomas Huth return false; 4853e4415a7SThomas Huth } 4863e4415a7SThomas Huth 4873e4415a7SThomas Huth static void virtio_setup(void) 4883e4415a7SThomas Huth { 4893e4415a7SThomas Huth Schib schib; 4903e4415a7SThomas Huth int ssid; 4913e4415a7SThomas Huth bool found = false; 4923e4415a7SThomas Huth uint16_t dev_no; 4933e4415a7SThomas Huth 4943e4415a7SThomas Huth /* 4953e4415a7SThomas Huth * We unconditionally enable mss support. In every sane configuration, 4963e4415a7SThomas Huth * this will succeed; and even if it doesn't, stsch_err() can deal 4973e4415a7SThomas Huth * with the consequences. 4983e4415a7SThomas Huth */ 4993e4415a7SThomas Huth enable_mss_facility(); 5003e4415a7SThomas Huth 5013e4415a7SThomas Huth if (store_iplb(&iplb)) { 5023e4415a7SThomas Huth IPL_assert(iplb.pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected"); 5033e4415a7SThomas Huth dev_no = iplb.ccw.devno; 5043e4415a7SThomas Huth debug_print_int("device no. ", dev_no); 5053e4415a7SThomas Huth net_schid.ssid = iplb.ccw.ssid & 0x3; 5063e4415a7SThomas Huth debug_print_int("ssid ", net_schid.ssid); 5073e4415a7SThomas Huth found = find_net_dev(&schib, dev_no); 5083e4415a7SThomas Huth } else { 5093e4415a7SThomas Huth for (ssid = 0; ssid < 0x3; ssid++) { 5103e4415a7SThomas Huth net_schid.ssid = ssid; 5113e4415a7SThomas Huth found = find_net_dev(&schib, -1); 5123e4415a7SThomas Huth if (found) { 5133e4415a7SThomas Huth break; 5143e4415a7SThomas Huth } 5153e4415a7SThomas Huth } 5163e4415a7SThomas Huth } 5173e4415a7SThomas Huth 5183e4415a7SThomas Huth IPL_assert(found, "No virtio net device found"); 5193e4415a7SThomas Huth } 5203e4415a7SThomas Huth 5213e4415a7SThomas Huth void main(void) 5223e4415a7SThomas Huth { 5230c188229SThomas Huth filename_ip_t fn_ip; 524c4942ee9SThomas Huth int rc, fnlen; 52529d12216SThomas Huth 5263e4415a7SThomas Huth sclp_setup(); 5273e4415a7SThomas Huth sclp_print("Network boot starting...\n"); 5283e4415a7SThomas Huth 5293e4415a7SThomas Huth virtio_setup(); 5303e4415a7SThomas Huth 5310c188229SThomas Huth rc = net_init(&fn_ip); 5320c188229SThomas Huth if (rc) { 5330c188229SThomas Huth panic("Network initialization failed. Halting.\n"); 5340c188229SThomas Huth } 5350c188229SThomas Huth 536134f0b3dSThomas Huth fnlen = strlen(fn_ip.filename); 537c4942ee9SThomas Huth if (fnlen > 0 && fn_ip.filename[fnlen - 1] != '/') { 538c4942ee9SThomas Huth rc = net_try_direct_tftp_load(&fn_ip); 539c4942ee9SThomas Huth } 540ec623990SThomas Huth if (rc <= 0) { 541ec623990SThomas Huth rc = net_try_pxelinux_cfg(&fn_ip); 542ec623990SThomas Huth } 5430c188229SThomas Huth 5440c188229SThomas Huth net_release(&fn_ip); 5450c188229SThomas Huth 54629d12216SThomas Huth if (rc > 0) { 54729d12216SThomas Huth sclp_print("Network loading done, starting kernel...\n"); 5489a848adfSThomas Huth jump_to_low_kernel(); 54929d12216SThomas Huth } 55029d12216SThomas Huth 5513e4415a7SThomas Huth panic("Failed to load OS from network\n"); 5523e4415a7SThomas Huth } 553