kernel2/cpu.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <sys/types.h>
  20 #include <stdint.h>
  21 #include <cpu.h>
  22 #include <memkernel.h>
  23 #include <paging.h>
  24 #include <llist.h>
  25 #include <sizes.h>
  26 #include <idt.h>
  27 #include <debug.h>
  28 #include <interrupt.h>
  29 #include <vga.h>
  30
  31 /**
  32  * Initializes CPUs
  33  *  @return 0=Success; -1=Failure
  34  */
  35 int cpu_init() {
  36   if ((cpus = llist_create())==NULL) return -1;
  37   cpu_t *cpu = malloc(sizeof(cpu_t));
  38   if (cpu==NULL) return -1;
  39   cpu->enabled = 1;
  40   cpu_stack_create(cpu,PAGE_SIZE);
  41   llist_push(cpus,cpu);
  42   return 0;
  43 }
  44 /**
  45  * Creates stack
  46  *  @param cpu CPU to create stack for
  47  *  @param size Stack size
  48  *  @return 0=Success; -1=Failure
  49  */
  50 int cpu_stack_create(cpu_t *cpu,size_t size) {
  51   if ((cpu->stack = memkernel_alloc((size_t)PAGEUP(size)))==NULL) return -1;
  52   cpu->stacksize = size;
  53   return 0;
  54 }
  55
  56 void cpu_id(uint32_t seax,uint32_t *deax,uint32_t *debx,uint32_t *decx,uint32_t *dedx) {
  57   uint32_t eax,ebx,ecx,edx;
  58   asm("cpuid":"=a"(eax),"=b"(ebx),"=c"(ecx),"=d"(edx):"a"(seax));
  59   if (deax!=NULL) *deax = eax;
  60   if (debx!=NULL) *debx = ebx;
  61   if (decx!=NULL) *decx = ecx;
  62   if (dedx!=NULL) *dedx = edx;
  63 }
  64
  65 /**
  66  * Shuts down computer
  67  */
  68 void cpu_shutdown() {
  69   //vga_text_clear();
  70   kprintf("Please turn off the computer\n");
  71   interrupt_enable(0);
  72   cpu_halt();
  73 }
  74
  75 /**
  76  * Resets computer
  77  */
  78 void cpu_restart() {
  79   idtsel_t idtsel = {
  80     .size = 0,
  81     .offset = 0
  82   };
  83   asm("lidt (%0)"::"r"(&idtsel));
  84 }