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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.  
  60. #ifndef __ASM__
  61.  
  62. #include <arch/types.h>
  63. #include <typedefs.h>
  64. #include <arch/context.h>
  65.  
  66. struct ptr_16_32 {
  67.     __u16 limit;
  68.     __u32 base;
  69. } __attribute__ ((packed));
  70. typedef struct ptr_16_32 ptr_16_32_t;
  71.  
  72. struct descriptor {
  73.     unsigned limit_0_15: 16;
  74.     unsigned base_0_15: 16;
  75.     unsigned base_16_23: 8;
  76.     unsigned access: 8;
  77.     unsigned limit_16_19: 4;
  78.     unsigned available: 1;
  79.     unsigned unused: 1;
  80.     unsigned special: 1;
  81.     unsigned granularity : 1;
  82.     unsigned base_24_31: 8;
  83. } __attribute__ ((packed));
  84. typedef struct descriptor  descriptor_t;
  85.  
  86. struct idescriptor {
  87.     unsigned offset_0_15: 16;
  88.     unsigned selector: 16;
  89.     unsigned unused: 8;
  90.     unsigned access: 8;
  91.     unsigned offset_16_31: 16;
  92. } __attribute__ ((packed));
  93. typedef struct idescriptor idescriptor_t;
  94.  
  95. struct tss {
  96.     __u16 link;
  97.     unsigned : 16;
  98.     __u32 esp0;
  99.     __u16 ss0;
  100.     unsigned : 16;
  101.     __u32 esp1;
  102.     __u16 ss1;
  103.     unsigned : 16;
  104.     __u32 esp2;
  105.     __u16 ss2;
  106.     unsigned : 16;
  107.     __u32 cr3;
  108.     __u32 eip;
  109.     __u32 eflags;
  110.     __u32 eax;
  111.     __u32 ecx;
  112.     __u32 edx;
  113.     __u32 ebx;
  114.     __u32 esp;
  115.     __u32 ebp;
  116.     __u32 esi;
  117.     __u32 edi;
  118.     __u16 es;
  119.     unsigned : 16;
  120.     __u16 cs;
  121.     unsigned : 16;
  122.     __u16 ss;
  123.     unsigned : 16;
  124.     __u16 ds;
  125.     unsigned : 16;
  126.     __u16 fs;
  127.     unsigned : 16;
  128.     __u16 gs;
  129.     unsigned : 16;
  130.     __u16 ldtr;
  131.     unsigned : 16;
  132.     unsigned : 16;
  133.     __u16 iomap_base;
  134.     __u8 iomap[0x10000+1];  /* 64K + 1 terminating byte */
  135. } __attribute__ ((packed));
  136. typedef struct tss tss_t;
  137.  
  138. extern ptr_16_32_t gdtr;
  139. extern ptr_16_32_t bootstrap_gdtr;
  140. extern ptr_16_32_t protected_ap_gdtr;
  141. extern struct tss *tss_p;
  142.  
  143. extern descriptor_t gdt[];
  144.  
  145. extern void pm_init(void);
  146.  
  147. extern void gdt_setbase(descriptor_t *d, __address base);
  148. extern void gdt_setlimit(descriptor_t *d, __u32 limit);
  149.  
  150. extern void idt_init(void);
  151. extern void idt_setoffset(idescriptor_t *d, __address offset);
  152.  
  153. extern void tss_initialize(tss_t *t);
  154. extern void set_tls_desc(__address tls);
  155.  
  156. #endif /* __ASM__ */
  157.  
  158. #endif
  159.