reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h

   1
   2 #ifndef HEX
   3 #define HEX(y) 0x##y
   4 #endif
   5
   6 /* Memory layout */
   7 #define STACK16ADDR         HEX(6F00) /* The 16-bit stack top will be at 0000:6F00 */
   8 #define BSS_START           HEX(6F00)
   9 #if defined(_USE_ML) || defined(_MSC_VER)
  10 #define FREELDR_BASE        HEX(f000)
  11 #define FREELDR_PE_BASE    HEX(10000)
  12 #else
  13 #define FREELDR_BASE        HEX(8000)
  14 #define FREELDR_PE_BASE     HEX(9000)
  15 #endif
  16 #define STACK32ADDR        HEX(78000) /* The 32-bit stack top will be at 7000:8000, or 0x78000 */
  17 #define BIOSCALLBUFFER     HEX(78000) /* Buffer to store temporary data for any Int386() call */
  18 #define BIOSCALLBUFSEGMENT  HEX(7800) /* Buffer to store temporary data for any Int386() call */
  19 #define BIOSCALLBUFOFFSET   HEX(0000) /* Buffer to store temporary data for any Int386() call */
  20 #define FILESYSBUFFER      HEX(80000) /* Buffer to store file system data (e.g. cluster buffer for FAT) */
  21 #define DISKREADBUFFER     HEX(90000) /* Buffer to store data read in from the disk via the BIOS */
  22 #define DISKREADBUFFER_SIZE 512
  23
  24 /* These addresses specify the realmode "BSS section" layout */
  25 #define BSS_RealModeEntry        (BSS_START +  0)
  26 #define BSS_CallbackAddress      (BSS_START +  4)
  27 #define BSS_CallbackReturn       (BSS_START +  8)
  28 #define BSS_RegisterSet          (BSS_START + 16) /* size = 36 */
  29 #define BSS_IntVector            (BSS_START + 52)
  30 #define BSS_PxeEntryPoint        (BSS_START + 56)
  31 #define BSS_PxeBufferSegment     (BSS_START + 60)
  32 #define BSS_PxeBufferOffset      (BSS_START + 64)
  33 #define BSS_PxeFunction          (BSS_START + 68)
  34 #define BSS_PxeResult            (BSS_START + 72)
  35 #define BSS_PnpBiosEntryPoint    (BSS_START + 76)
  36 #define BSS_PnpBiosDataSegment   (BSS_START + 80)
  37 #define BSS_PnpBiosBufferSegment (BSS_START + 84)
  38 #define BSS_PnpBiosBufferOffset  (BSS_START + 88)
  39 #define BSS_PnpNodeSize          (BSS_START + 92)
  40 #define BSS_PnpNodeCount         (BSS_START + 96)
  41 #define BSS_PnpNodeNumber        (BSS_START + 100)
  42 #define BSS_PnpResult            (BSS_START + 104)
  43
  44
  45 /* Realmode function IDs */
  46 #define FNID_Int386 0
  47 #define FNID_SoftReboot 1
  48 #define FNID_ChainLoadBiosBootSectorCode 2
  49 #define FNID_PxeCallApi 3
  50 #define FNID_PnpBiosGetDeviceNodeCount 4
  51 #define FNID_PnpBiosGetDeviceNode 5
  52
  53 /* Layout of the REGS structure */
  54 #define REGS_EAX 0
  55 #define REGS_EBX 4
  56 #define REGS_ECX 8
  57 #define REGS_EDX 12
  58 #define REGS_ESI 16
  59 #define REGS_EDI 20
  60 #define REGS_DS 24
  61 #define REGS_ES 26
  62 #define REGS_FS 28
  63 #define REGS_GS 30
  64 #define REGS_EFLAGS 32
  65
  66
  67 // Flag Masks
  68 #define I386FLAG_CF             HEX(0001)  // Carry Flag
  69 #define I386FLAG_RESV1  HEX(0002)  // Reserved - Must be 1
  70 #define I386FLAG_PF             HEX(0004)  // Parity Flag
  71 #define I386FLAG_RESV2  HEX(0008)  // Reserved - Must be 0
  72 #define I386FLAG_AF             HEX(0010)  // Auxiliary Flag
  73 #define I386FLAG_RESV3  HEX(0020)  // Reserved - Must be 0
  74 #define I386FLAG_ZF             HEX(0040)  // Zero Flag
  75 #define I386FLAG_SF             HEX(0080)  // Sign Flag
  76 #define I386FLAG_TF             HEX(0100)  // Trap Flag (Single Step)
  77 #define I386FLAG_IF             HEX(0200)  // Interrupt Flag
  78 #define I386FLAG_DF             HEX(0400)  // Direction Flag
  79 #define I386FLAG_OF             HEX(0800)  // Overflow Flag
  80
  81 #define CR0_PE_SET      HEX(00000001)   /* OR this value with CR0 to enable pmode */
  82 #define CR0_PE_CLR      HEX(FFFFFFFE)   /* AND this value with CR0 to disable pmode */
  83
  84 /* Defines needed for switching between real and protected mode */
  85 //#ifdef _M_IX86
  86 #define NULL_DESC       HEX(00) /* NULL descriptor */
  87 #define PMODE_CS        HEX(08) /* PMode code selector, base 0 limit 4g */
  88 #define PMODE_DS        HEX(10) /* PMode data selector, base 0 limit 4g */
  89 #define RMODE_CS        HEX(18) /* RMode code selector, base 0 limit 64k */
  90 #define RMODE_DS        HEX(20) /* RMode data selector, base 0 limit 64k */
  91 //#endif
  92
  93 /* Makes "x" a global variable or label */
  94 #define EXTERN(x)       .global x; x: