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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __PM_H__
  30. #define __PM_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <arch/context.h>
  35.  
  36. #define IDT_ITEMS 64
  37. #define GDT_ITEMS 6
  38.  
  39. #define NULL_DES    0
  40. #define KTEXT_DES   1
  41. #define KDATA_DES   2
  42. #define UTEXT_DES   3
  43. #define UDATA_DES   4
  44. #define TSS_DES     5
  45.  
  46. #define selector(des)   ((des)<<3)
  47.  
  48. #define PL_KERNEL   0
  49. #define PL_USER     3
  50.  
  51. #define AR_PRESENT  (1<<7)
  52. #define AR_DATA     (2<<3)
  53. #define AR_CODE     (3<<3)
  54. #define AR_WRITABLE (1<<1)
  55. #define AR_INTERRUPT    (0xe)
  56. #define AR_TSS      (0x9)
  57.  
  58. #define DPL_KERNEL  (PL_KERNEL<<5)
  59. #define DPL_USER    (PL_USER<<5)
  60.  
  61. #define IO_MAP_BASE (104)
  62.  
  63. struct ptr_16_32 {
  64.     __u16 limit;
  65.     __u32 base;
  66. } __attribute__ ((packed));
  67.  
  68. struct descriptor {
  69.     unsigned limit_0_15: 16;
  70.     unsigned base_0_15: 16;
  71.     unsigned base_16_23: 8;
  72.     unsigned access: 8;
  73.     unsigned limit_16_19: 4;
  74.     unsigned available: 1;
  75.     unsigned unused: 1;
  76.     unsigned special: 1;
  77.     unsigned granularity : 1;
  78.     unsigned base_24_31: 8;
  79. } __attribute__ ((packed));
  80.  
  81. struct idescriptor {
  82.     unsigned offset_0_15: 16;
  83.     unsigned selector: 16;
  84.     unsigned unused: 8;
  85.     unsigned access: 8;
  86.     unsigned offset_16_31: 16;
  87. } __attribute__ ((packed));
  88.  
  89.  
  90. struct tss {
  91.     __u16 link;
  92.     unsigned : 16;
  93.     __u32 esp0;
  94.     __u16 ss0;
  95.     unsigned : 16;
  96.     __u32 esp1;
  97.     __u16 ss1;
  98.     unsigned : 16;
  99.     __u32 esp2;
  100.     __u16 ss2;
  101.     unsigned : 16;
  102.     __u32 cr3;
  103.     __u32 eip;
  104.     __u32 eflags;
  105.     __u32 eax;
  106.     __u32 ecx;
  107.     __u32 edx;
  108.     __u32 ebx;
  109.     __u32 esp;
  110.     __u32 ebp;
  111.     __u32 esi;
  112.     __u32 edi;
  113.     __u16 es;
  114.     unsigned : 16;
  115.     __u16 cs;
  116.     unsigned : 16;
  117.     __u16 ss;
  118.     unsigned : 16;
  119.     __u16 ds;
  120.     unsigned : 16;
  121.     __u16 fs;
  122.     unsigned : 16;
  123.     __u16 gs;
  124.     unsigned : 16;
  125.     __u16 ldtr;
  126.     unsigned : 16;
  127.     unsigned : 16;
  128.     __u16 io_map_base;
  129. } __attribute__ ((packed));
  130.  
  131. extern struct ptr_16_32 gdtr;
  132. extern struct tss *tss_p;
  133.  
  134. extern struct descriptor gdt[];
  135. extern struct idescriptor idt[];
  136.  
  137. extern void pm_init(void);
  138.  
  139. extern void gdt_setbase(struct descriptor *d, __address base);
  140. extern void gdt_setlimit(struct descriptor *d, __address limit);
  141.  
  142. extern void idt_init(void);
  143. extern void idt_setoffset(struct idescriptor *d, __address offset);
  144.  
  145. extern void tss_initialize(struct tss *t);
  146.  
  147. #endif
  148.