137 lines
3.0 KiB
C
137 lines
3.0 KiB
C
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/*
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* S390 virtio-ccw network boot loading program
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*
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* Copyright 2017 Thomas Huth, Red Hat Inc.
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*
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* Based on the S390 virtio-ccw loading program (main.c)
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include "s390-ccw.h"
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#include "virtio.h"
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extern char _start[];
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char stack[PAGE_SIZE * 8] __attribute__((aligned(PAGE_SIZE)));
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IplParameterBlock iplb __attribute__((aligned(PAGE_SIZE)));
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static SubChannelId net_schid = { .one = 1 };
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static uint64_t dest_timer;
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static uint64_t get_timer_ms(void)
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{
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uint64_t clk;
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asm volatile(" stck %0 " : : "Q"(clk) : "memory");
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/* Bit 51 is incremented each microsecond */
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return (clk >> (63 - 51)) / 1000;
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}
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void set_timer(int val)
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{
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dest_timer = get_timer_ms() + val;
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}
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int get_timer(void)
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{
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return dest_timer - get_timer_ms();
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}
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int get_sec_ticks(void)
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{
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return 1000; /* number of ticks in 1 second */
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}
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void panic(const char *string)
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{
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sclp_print(string);
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for (;;) {
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disabled_wait();
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}
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}
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static bool find_net_dev(Schib *schib, int dev_no)
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{
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int i, r;
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for (i = 0; i < 0x10000; i++) {
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net_schid.sch_no = i;
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r = stsch_err(net_schid, schib);
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if (r == 3 || r == -EIO) {
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break;
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}
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if (!schib->pmcw.dnv) {
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continue;
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}
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if (!virtio_is_supported(net_schid)) {
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continue;
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}
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if (virtio_get_device_type() != VIRTIO_ID_NET) {
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continue;
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}
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if (dev_no < 0 || schib->pmcw.dev == dev_no) {
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return true;
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}
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}
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return false;
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}
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static void virtio_setup(void)
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{
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Schib schib;
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int ssid;
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bool found = false;
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uint16_t dev_no;
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/*
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* We unconditionally enable mss support. In every sane configuration,
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* this will succeed; and even if it doesn't, stsch_err() can deal
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* with the consequences.
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*/
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enable_mss_facility();
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if (store_iplb(&iplb)) {
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IPL_assert(iplb.pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected");
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dev_no = iplb.ccw.devno;
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debug_print_int("device no. ", dev_no);
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net_schid.ssid = iplb.ccw.ssid & 0x3;
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debug_print_int("ssid ", net_schid.ssid);
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found = find_net_dev(&schib, dev_no);
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} else {
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for (ssid = 0; ssid < 0x3; ssid++) {
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net_schid.ssid = ssid;
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found = find_net_dev(&schib, -1);
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if (found) {
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break;
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}
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}
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}
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IPL_assert(found, "No virtio net device found");
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}
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void main(void)
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{
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sclp_setup();
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sclp_print("Network boot starting...\n");
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virtio_setup();
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panic("Failed to load OS from network\n");
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}
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