nss/login/main.c

   1 /*
   2  * (C) Copyright 2007-2011  Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * This file is released under the GPLv2.  See the COPYING file for more
   5  * details.
   6  */
   7
   8 #include <arch.h>
   9 #include <string.h>
  10 #include <int.h>
  11 #include <misc.h>
  12
  13 /*
  14  * This guest OS has a very simple purpose.  It is responsible for
  15  * displaying the login splash, prompting the user for a username and
  16  * password, and then querying CP to verify that the password is correct.
  17  * If correct, CP will detach the rdev from this guest, and attach it to the
  18  * user's guest.
  19  *
  20  *         +------------------------------------------------+
  21  *         | +------------------------------------+         |
  22  *         | | virt_sys                           |         |
  23  *         | | +--------+ +-------+ +---------+   |   +----+|
  24  *         | | |virt_cpu| |storage| |virt_cons|<--+-->|rdev||
  25  *         | | +--------+ +-------+ +---------+   |   +----+|
  26  *         | |                           /\       |         |
  27  *         | |                           ||       |         |
  28  *         | |                           \/       |         |
  29  *         | | +--------+ +--------+ +--------+   |         |
  30  *         | | |virt_dev| |virt_dev| |virt_dev|   |         |
  31  *         | | +--------+ +--------+ +--------+   |         |
  32  *         | +------------------------------------+         |
  33  *         |                                                |
  34  *         | +------------------------------------+         |
  35  *         | | virt_sys                           |         |
  36  *         | | +--------+ +-------+ +---------+   |   +----+|
  37  *         | | |virt_cpu| |storage| |virt_cons|<--+-->|rdev||
  38  *         | | +--------+ +-------+ +---------+   |   +----+|
  39  *         | |                           /\       |         |
  40  *         | |                           ||       |         |
  41  *         | |                           \/       |         |
  42  *         | | +--------+ +--------+ +--------+   |         |
  43  *         | | |virt_dev| |virt_dev| |virt_dev|   |         |
  44  *         | | +--------+ +--------+ +--------+   |         |
  45  *         | +------------------------------------+         |
  46  *         |                                                |
  47  *         |                   :                            |
  48  *         |                   :                            |
  49  *         |                   :                            |
  50  *         |                                                |
  51  *         | +------------------------------------+         |
  52  *         | | virt_sys (*LOGIN)                  |         |
  53  *         | | +--------+ +-------+ +---------+   |         |
  54  *         | | |virt_cpu| |storage| |virt_cons|   |         |
  55  *         | | +--------+ +-------+ +---------+   |         |
  56  *         | |                       +--------+   |   +----+|
  57  *         | |                       |virt_dev|<--+-->|rdev||
  58  *         | |                       +--------+   |   +----+|
  59  *         | |                       +--------+   |   +----+|
  60  *         | |                       |virt_dev|<--+-->|rdev||
  61  *         | |                       +--------+   |   +----+|
  62  *         | |                       +--------+   |   +----+|
  63  *         | |                       |virt_dev|<--+-->|rdev||
  64  *         | |                       +--------+   |   +----+|
  65  *         | +------------------------------------+         |
  66  *         +------------------------------------------------+
  67  *
  68  *
  69  * In other words, here are the actions that CP takes:
  70  *
  71  * host IPL:
  72  *  - ipl *LOGIN
  73  *  - attach operator console to *LOGIN
  74  *
  75  * login:
  76  *  - alloc virt sys, virt cpu, virt devices, virt cons, storage
  77  *  - detach console rdev from *LOGIN
  78  *  - attach console rdev to virt cons
  79  *
  80  * logout/force:
  81  *  - free virt sys, virt cpu, virt devices, virt cons, storage
  82  *  - attach console rdev to *LOGIN
  83  *
  84  * disconnect:
  85  *  - detach console rdev from virt cons
  86  *  - attach console rdev to *LOGIN
  87  *
  88  * reconnect:
  89  *  - detach console rdev from *LOGIN
  90  *  - attach console rdev to virt cons
  91  */
  92
  93 struct psw disabled_wait = { .w = 1, .ea = 1, .ba = 1, .ptr = 0xfafafa, };
  94 struct psw enabled_wait = { .io = 1, .m = 1, .w = 1, .ea = 1, .ba = 1, };
  95
  96 static struct psw __new_rst = { .ea = 1, .ba = 1, .ptr = ADDR64(&rst_int), };
  97 static struct psw __new_ext = { .ea = 1, .ba = 1, .ptr = ADDR64(&ext_int), };
  98 static struct psw __new_svc = { .ea = 1, .ba = 1, .ptr = ADDR64(&svc_int), };
  99 static struct psw __new_prg = { .ea = 1, .ba = 1, .ptr = ADDR64(&prg_int), };
 100 static struct psw __new_mch = { .ea = 1, .ba = 1, .ptr = ADDR64(&mch_int), };
 101 static struct psw __new_io  = { .ea = 1, .ba = 1, .ptr = ADDR64(&io_int), };
 102
 103 static void init_io(void)
 104 {
 105         u64 cr6;
 106
 107         cr6 = get_cr(6);
 108
 109         /* enable all I/O interrupt classes */
 110         cr6 |= BIT64(32);
 111         cr6 |= BIT64(33);
 112         cr6 |= BIT64(34);
 113         cr6 |= BIT64(35);
 114         cr6 |= BIT64(36);
 115         cr6 |= BIT64(37);
 116         cr6 |= BIT64(38);
 117         cr6 |= BIT64(39);
 118
 119         set_cr(6, cr6);
 120 }
 121
 122 void start()
 123 {
 124         /* set up interrupt PSWs */
 125         memcpy(&psw_rst_new, &__new_rst, sizeof(struct psw));
 126         memcpy(&psw_ext_new, &__new_ext, sizeof(struct psw));
 127         memcpy(&psw_svc_new, &__new_svc, sizeof(struct psw));
 128         memcpy(&psw_prg_new, &__new_prg, sizeof(struct psw));
 129         memcpy(&psw_mch_new, &__new_mch, sizeof(struct psw));
 130         memcpy(&psw_io_new,  &__new_io,  sizeof(struct psw));
 131
 132         /* enable all 8 I/O classes */
 133         init_io();
 134
 135         /* enable Channel-Report-Pending Machine Check Interruption subclass */
 136         set_cr(14, get_cr(14) | BIT64(35));
 137
 138         /* this enables I/O & MCH interrupts */
 139         lpswe(&enabled_wait);
 140
 141         die();
 142 }