kernel/arch/i386/arch.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   5  *
   6  *  This program is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include <config.h>
  22
  23 static unsigned long read_pentium_clock ()
  24 {
  25         register unsigned lb;
  26         register unsigned hb;
  27
  28         __asm__ __volatile__ ("rdtsc" : "=a" (lb), "=d" (hb));
  29
  30         return( ((unsigned long) hb) << 24 | lb );
  31 }
  32
  33 void cpu_info ()
  34 {
  35         printf ("CPU: i386 compatibile\nClock: %lu MHz\n", read_pentium_clock ());
  36 }
  37
  38 /* enable interrupts */
  39 unsigned int_enable ()
  40 {
  41         __asm__ __volatile__("sti"
  42                 :
  43                 :
  44                 );
  45
  46         return 1;
  47 }
  48
  49 /* disable interrupts */
  50 unsigned int_disable ()
  51 {
  52         unsigned ret;
  53
  54         __asm__ __volatile__("pushfl\n"
  55                 "popl %0\n"
  56                 "cli"
  57                 : "=a"(ret)
  58                 :);
  59
  60         return ret;
  61 }
  62
  63 /* wait one tick */
  64 void arch_cpu_hlt ()
  65 {
  66 #ifndef CONFIG_COMPAT_QEMU      /* dont know, but it is probably Qemu bug, because it hard halt cpu */
  67         asm volatile ("hlt");
  68 #endif
  69 }
  70
  71 unsigned arch_cpu_reset ()
  72 {
  73         outb (0x64, 0xFE);
  74
  75         return 1;
  76 }
  77
  78 unsigned arch_cpu_shutdown ()
  79 {
  80
  81         return 1;
  82 }
  83
  84 /* architecture initialization process */
  85 unsigned init_arch ()
  86 {
  87         if (!gdt_install ())
  88                 return 0;
  89
  90         if (!idt_install ())
  91                 return 0;
  92
  93         if (!isrs_install ())
  94                 return 0;
  95
  96         if (!irq_install ())
  97                 return 0;
  98
  99         if (!timer_install ())
 100                 return 0;
 101
 102         return 1;
 103 }