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   1 /*-
   2  * Copyright (c) 2005, Kohsuke Ohtani
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #ifndef _X86_CPU_H
  31 #define _X86_CPU_H
  33 #include <sys/cdefs.h>  /* for __packed */
  35 /*
  36  * GDTs
  37  */
  38 #define KERNEL_CS       0x10
  39 #define KERNEL_DS       0x18
  40 #define USER_CS         0x20
  41 #define USER_DS         0x28
  42 #define KERNEL_TSS      0x38
  44 #define NGDTS           8
  46 /*
  47  * IDTs
  48  */
  49 #define NIDTS           0x41
  50 #define SYSCALL_INT     0x40
  51 #define INVALID_INT     0xFF
  53 /*
  54  * x86 flags register
  55  */
  56 #define EFL_CF          0x00000001      /* Carry */
  57 #define EFL_PF          0x00000004      /* Parity */
  58 #define EFL_AF          0x00000010      /* Carry */
  59 #define EFL_ZF          0x00000040      /* Zero */
  60 #define EFL_SF          0x00000080      /* Sign */
  61 #define EFL_TF          0x00000100      /* Trap */
  62 #define EFL_IF          0x00000200      /* Interrupt enable */
  63 #define EFL_DF          0x00000400      /* Direction */
  64 #define EFL_OF          0x00000800      /* Overflow */
  65 #define EFL_IOPL        0x00003000      /* IO privilege level: */
  66 #define EFL_IOPL_KERN   0x00000000      /* Kernel */
  67 #define EFL_IOPL_USER   0x00003000      /* User */
  68 #define EFL_NT          0x00004000      /* Nested task */
  69 #define EFL_RF          0x00010000      /* Resume without tracing */
  70 #define EFL_VM          0x00020000      /* Virtual 8086 mode */
  71 #define EFL_AC          0x00040000      /* Alignment Check */
  73 /*
  74  * CR0 register
  75  */
  76 #define CR0_PG          0x80000000      /* enable paging */
  77 #define CR0_CD          0x40000000      /* cache disable */
  78 #define CR0_NW          0x20000000      /* no write-through */
  79 #define CR0_AM          0x00040000      /* alignment check mask */
  80 #define CR0_WP          0x00010000      /* write-protect kernel access */
  81 #define CR0_NE          0x00000020      /* handle numeric exceptions */
  82 #define CR0_ET          0x00000010      /* extension type is 80387 coprocessor */
  83 #define CR0_TS          0x00000008      /* task switch */
  84 #define CR0_EM          0x00000004      /* emulate coprocessor */
  85 #define CR0_MP          0x00000002      /* monitor coprocessor */
  86 #define CR0_PE          0x00000001      /* enable protected mode */
  88 #ifndef __ASSEMBLY__
  90 #include <sys/types.h>
  91 #include <context.h>
  93 #if defined(__SUNPRO_C)
  94 #pragma pack(1)
  95 #endif
  97 /*
  98  * Segment Descriptor
  99  */
 100 struct seg_desc {
u_int limit_lo:16;      /* segment limit (lsb) */
u_int base_lo:16;       /* segment base address (lsb) */
u_int base_mid:8;       /* segment base address (middle) */
u_int type:8;           /* type */
u_int limit_hi:4;       /* segment limit (msb) */
u_int size:4;           /* size */
u_int base_hi:8;        /* segment base address (msb) */
 108 } __packed;
 110 /*
 111  * Gate Descriptor
 112  */
 113 struct gate_desc {
u_int offset_lo:16;     /* gate offset (lsb) */
u_int selector:16;      /* gate segment selector */
u_int nr_copy:8;        /* stack copy count */
u_int type:8;           /* type */
u_int offset_hi:16;     /* gate offset (msb) */
 119 } __packed;
 121 /*
 122  * Linear memory description for lgdt and lidt instructions.
 123  */
 124 struct desc_p {
uint16_t limit;
uint32_t base;
 127 } __packed;
 129 /*
 130  * Segment size
 131  */
 132 #define SIZE_32         0x4     /* 32-bit segment */
 133 #define SIZE_16         0x0     /* 16-bit segment */
 134 #define SIZE_4K         0x8     /* 4K limit field */
 136 /*
 137  * Segment type
 138  */
 139 #define ST_ACC          0x01    /* accessed */
 140 #define ST_LDT          0x02    /* LDT */
 141 #define ST_CALL_GATE_16 0x04    /* 16-bit call gate */
 142 #define ST_TASK_GATE    0x05    /* task gate */
 143 #define ST_TSS          0x09    /* task segment */
 144 #define ST_CALL_GATE    0x0c    /* call gate */
 145 #define ST_INTR_GATE    0x0e    /* interrupt gate */
 146 #define ST_TRAP_GATE    0x0f    /* trap gate */
 148 #define ST_TSS_BUSY     0x02    /* task busy */
 150 #define ST_DATA         0x10    /* data */
 151 #define ST_DATA_W       0x12    /* data, writable */
 152 #define ST_DATA_E       0x14    /* data, expand-down */
 153 #define ST_DATA_EW      0x16    /* data, expand-down, writable */
 155 #define ST_CODE         0x18    /* code */
 156 #define ST_CODE_R       0x1a    /* code, readable */
 157 #define ST_CODE_C       0x1c    /* code, conforming */
 158 #define ST_CODE_CR      0x1e    /* code, conforming, readable */
 160 #define ST_KERN         0x00    /* kernel access only */
 161 #define ST_USER         0x60    /* user access */
 163 #define ST_PRESENT      0x80    /* segment present */
 165 /*
 166  * Task State Segment (TSS)
 167  */
 169 #define IO_BITMAP_SIZE          (65536/8 + 1)
 170 #define INVALID_IO_BITMAP       0x8000
 172 struct tss {
uint32_t back_link;
uint32_t esp0, ss0;
uint32_t esp1, ss1;
uint32_t esp2, ss2;
uint32_t cr3;
uint32_t eip;
uint32_t eflags;
uint32_t eax, ecx, edx, ebx;
uint32_t esp, ebp, esi, edi;
uint32_t es, cs, ss, ds, fs, gs;
uint32_t ldt;
uint16_t dbg_trace;
uint16_t io_bitmap_offset;
 186 #if 0
uint32_t io_bitmap[IO_BITMAP_SIZE/4+1];
uint32_t pad[5];
 189 #endif
 190 } __packed;
 193 #if defined(__SUNPRO_C)
 194 #pragma pack()
 195 #endif
__BEGIN_DECLS
 198 void     tss_set(uint32_t);
uint32_t tss_get(void);
 200 void     cpu_init(void);
__END_DECLS
 203 #endif /* !__ASSEMBLY__ */
 204 #endif /* !_X86_CPU_H */