nss/login/main.c

   1 /*
   2  * Copyright (c) 2007-2019 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #include <arch.h>
  24 #include <string.h>
  25 #include "int.h"
  26 #include "misc.h"
  27
  28 /*
  29  * This guest OS has a very simple purpose.  It is responsible for
  30  * displaying the login splash, prompting the user for a username and
  31  * password, and then querying CP to verify that the password is correct.
  32  * If correct, CP will detach the rdev from this guest, and attach it to the
  33  * user's guest.
  34  *
  35  *         +------------------------------------------------+
  36  *         | +------------------------------------+         |
  37  *         | | virt_sys                           |         |
  38  *         | | +--------+ +-------+ +---------+   |   +----+|
  39  *         | | |virt_cpu| |storage| |virt_cons|<--+-->|rdev||
  40  *         | | +--------+ +-------+ +---------+   |   +----+|
  41  *         | |                           /\       |         |
  42  *         | |                           ||       |         |
  43  *         | |                           \/       |         |
  44  *         | | +--------+ +--------+ +--------+   |         |
  45  *         | | |virt_dev| |virt_dev| |virt_dev|   |         |
  46  *         | | +--------+ +--------+ +--------+   |         |
  47  *         | +------------------------------------+         |
  48  *         |                                                |
  49  *         | +------------------------------------+         |
  50  *         | | virt_sys                           |         |
  51  *         | | +--------+ +-------+ +---------+   |   +----+|
  52  *         | | |virt_cpu| |storage| |virt_cons|<--+-->|rdev||
  53  *         | | +--------+ +-------+ +---------+   |   +----+|
  54  *         | |                           /\       |         |
  55  *         | |                           ||       |         |
  56  *         | |                           \/       |         |
  57  *         | | +--------+ +--------+ +--------+   |         |
  58  *         | | |virt_dev| |virt_dev| |virt_dev|   |         |
  59  *         | | +--------+ +--------+ +--------+   |         |
  60  *         | +------------------------------------+         |
  61  *         |                                                |
  62  *         |                   :                            |
  63  *         |                   :                            |
  64  *         |                   :                            |
  65  *         |                                                |
  66  *         | +------------------------------------+         |
  67  *         | | virt_sys (*LOGIN)                  |         |
  68  *         | | +--------+ +-------+ +---------+   |         |
  69  *         | | |virt_cpu| |storage| |virt_cons|   |         |
  70  *         | | +--------+ +-------+ +---------+   |         |
  71  *         | |                       +--------+   |   +----+|
  72  *         | |                       |virt_dev|<--+-->|rdev||
  73  *         | |                       +--------+   |   +----+|
  74  *         | |                       +--------+   |   +----+|
  75  *         | |                       |virt_dev|<--+-->|rdev||
  76  *         | |                       +--------+   |   +----+|
  77  *         | |                       +--------+   |   +----+|
  78  *         | |                       |virt_dev|<--+-->|rdev||
  79  *         | |                       +--------+   |   +----+|
  80  *         | +------------------------------------+         |
  81  *         +------------------------------------------------+
  82  *
  83  *
  84  * In other words, here are the actions that CP takes:
  85  *
  86  * host IPL:
  87  *  - ipl *LOGIN
  88  *  - attach operator console to *LOGIN
  89  *
  90  * login:
  91  *  - alloc virt sys, virt cpu, virt devices, virt cons, storage
  92  *  - detach console rdev from *LOGIN
  93  *  - attach console rdev to virt cons
  94  *
  95  * logout/force:
  96  *  - free virt sys, virt cpu, virt devices, virt cons, storage
  97  *  - attach console rdev to *LOGIN
  98  *
  99  * disconnect:
 100  *  - detach console rdev from virt cons
 101  *  - attach console rdev to *LOGIN
 102  *
 103  * reconnect:
 104  *  - detach console rdev from *LOGIN
 105  *  - attach console rdev to virt cons
 106  */
 107
 108 struct psw disabled_wait = { .w = 1, .ea = 1, .ba = 1, .ptr = 0xfafafa, };
 109 struct psw enabled_wait = { .io = 1, .m = 1, .w = 1, .ea = 1, .ba = 1, };
 110
 111 static struct psw __new_rst = { .ea = 1, .ba = 1, .ptr = ADDR64(&rst_int), };
 112 static struct psw __new_ext = { .ea = 1, .ba = 1, .ptr = ADDR64(&ext_int), };
 113 static struct psw __new_svc = { .ea = 1, .ba = 1, .ptr = ADDR64(&svc_int), };
 114 static struct psw __new_prg = { .ea = 1, .ba = 1, .ptr = ADDR64(&prg_int), };
 115 static struct psw __new_mch = { .ea = 1, .ba = 1, .ptr = ADDR64(&mch_int), };
 116 static struct psw __new_io  = { .ea = 1, .ba = 1, .ptr = ADDR64(&io_int), };
 117
 118 static void init_io(void)
 119 {
 120         u64 cr6;
 121
 122         cr6 = get_cr(6);
 123
 124         /* enable all I/O interrupt classes */
 125         cr6 |= BIT64(32);
 126         cr6 |= BIT64(33);
 127         cr6 |= BIT64(34);
 128         cr6 |= BIT64(35);
 129         cr6 |= BIT64(36);
 130         cr6 |= BIT64(37);
 131         cr6 |= BIT64(38);
 132         cr6 |= BIT64(39);
 133
 134         set_cr(6, cr6);
 135 }
 136
 137 static void init_mch(void)
 138 {
 139         u64 cr14;
 140
 141         cr14 = get_cr(14);
 142
 143         /* enable Channel-Report-Pending Machine Check Interruption subclass */
 144         cr14 |= BIT64(35);
 145
 146         set_cr(14, cr14);
 147 }
 148
 149 void start()
 150 {
 151         /* set up interrupt PSWs */
 152         memcpy(&psw_rst_new, &__new_rst, sizeof(struct psw));
 153         memcpy(&psw_ext_new, &__new_ext, sizeof(struct psw));
 154         memcpy(&psw_svc_new, &__new_svc, sizeof(struct psw));
 155         memcpy(&psw_prg_new, &__new_prg, sizeof(struct psw));
 156         memcpy(&psw_mch_new, &__new_mch, sizeof(struct psw));
 157         memcpy(&psw_io_new,  &__new_io,  sizeof(struct psw));
 158
 159         /* enable all 8 I/O classes */
 160         init_io();
 161
 162         init_mch();
 163
 164         /* this enables I/O & MCH interrupts */
 165         lpswe(&enabled_wait);
 166
 167         die();
 168 }