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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. #define IDT_ITEMS 64
  33. #define GDT_ITEMS 7
  34.  
  35. #define NULL_DES    0
  36. #define KTEXT_DES   1
  37. #define KDATA_DES   2
  38. #define UTEXT_DES   3
  39. #define UDATA_DES   4
  40. #define TSS_DES     5
  41. #define TLS_DES         6 /* Pointer to Thread-Local-Storage data */
  42.  
  43. #define selector(des)   ((des)<<3)
  44.  
  45. #define PL_KERNEL   0
  46. #define PL_USER     3
  47.  
  48. #define AR_PRESENT  (1<<7)
  49. #define AR_DATA     (2<<3)
  50. #define AR_CODE     (3<<3)
  51. #define AR_WRITABLE (1<<1)
  52. #define AR_INTERRUPT    (0xe)
  53. #define AR_TSS      (0x9)
  54.  
  55. #define DPL_KERNEL  (PL_KERNEL<<5)
  56. #define DPL_USER    (PL_USER<<5)
  57.  
  58. #define TSS_BASIC_SIZE  104
  59. #define TSS_IOMAP_SIZE  (16*1024+1) /* 16K for bitmap + 1 terminating byte for convenience */
  60.  
  61. #ifndef __ASM__
  62.  
  63. #include <arch/types.h>
  64. #include <typedefs.h>
  65. #include <arch/context.h>
  66.  
  67. struct ptr_16_32 {
  68.     __u16 limit;
  69.     __u32 base;
  70. } __attribute__ ((packed));
  71. typedef struct ptr_16_32 ptr_16_32_t;
  72.  
  73. struct descriptor {
  74.     unsigned limit_0_15: 16;
  75.     unsigned base_0_15: 16;
  76.     unsigned base_16_23: 8;
  77.     unsigned access: 8;
  78.     unsigned limit_16_19: 4;
  79.     unsigned available: 1;
  80.     unsigned unused: 1;
  81.     unsigned special: 1;
  82.     unsigned granularity : 1;
  83.     unsigned base_24_31: 8;
  84. } __attribute__ ((packed));
  85. typedef struct descriptor  descriptor_t;
  86.  
  87. struct idescriptor {
  88.     unsigned offset_0_15: 16;
  89.     unsigned selector: 16;
  90.     unsigned unused: 8;
  91.     unsigned access: 8;
  92.     unsigned offset_16_31: 16;
  93. } __attribute__ ((packed));
  94. typedef struct idescriptor idescriptor_t;
  95.  
  96. struct tss {
  97.     __u16 link;
  98.     unsigned : 16;
  99.     __u32 esp0;
  100.     __u16 ss0;
  101.     unsigned : 16;
  102.     __u32 esp1;
  103.     __u16 ss1;
  104.     unsigned : 16;
  105.     __u32 esp2;
  106.     __u16 ss2;
  107.     unsigned : 16;
  108.     __u32 cr3;
  109.     __u32 eip;
  110.     __u32 eflags;
  111.     __u32 eax;
  112.     __u32 ecx;
  113.     __u32 edx;
  114.     __u32 ebx;
  115.     __u32 esp;
  116.     __u32 ebp;
  117.     __u32 esi;
  118.     __u32 edi;
  119.     __u16 es;
  120.     unsigned : 16;
  121.     __u16 cs;
  122.     unsigned : 16;
  123.     __u16 ss;
  124.     unsigned : 16;
  125.     __u16 ds;
  126.     unsigned : 16;
  127.     __u16 fs;
  128.     unsigned : 16;
  129.     __u16 gs;
  130.     unsigned : 16;
  131.     __u16 ldtr;
  132.     unsigned : 16;
  133.     unsigned : 16;
  134.     __u16 iomap_base;
  135.     __u8 iomap[TSS_IOMAP_SIZE];
  136. } __attribute__ ((packed));
  137. typedef struct tss tss_t;
  138.  
  139. extern ptr_16_32_t gdtr;
  140. extern ptr_16_32_t bootstrap_gdtr;
  141. extern ptr_16_32_t protected_ap_gdtr;
  142. extern struct tss *tss_p;
  143.  
  144. extern descriptor_t gdt[];
  145.  
  146. extern void pm_init(void);
  147.  
  148. extern void gdt_setbase(descriptor_t *d, __address base);
  149. extern void gdt_setlimit(descriptor_t *d, __u32 limit);
  150.  
  151. extern void idt_init(void);
  152. extern void idt_setoffset(idescriptor_t *d, __address offset);
  153.  
  154. extern void tss_initialize(tss_t *t);
  155. extern void set_tls_desc(__address tls);
  156.  
  157. #endif /* __ASM__ */
  158.  
  159. #endif
  160.