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 #define FREELDR_BASE        HEX(8000)
  10 #define FREELDR_PE_BASE     HEX(9000)
  11 #define STACK32ADDR        HEX(78000) /* The 32-bit stack top will be at 7000:8000, or 0x78000 */
  12 #define BIOSCALLBUFFER     HEX(78000) /* Buffer to store temporary data for any Int386() call */
  13 #define BIOSCALLBUFSEGMENT  HEX(7800) /* Buffer to store temporary data for any Int386() call */
  14 #define BIOSCALLBUFOFFSET   HEX(0000) /* Buffer to store temporary data for any Int386() call */
  15 #define FILESYSBUFFER      HEX(80000) /* Buffer to store file system data (e.g. cluster buffer for FAT) */
  16 #define DISKREADBUFFER     HEX(90000) /* Buffer to store data read in from the disk via the BIOS */
  17 #define DISKREADBUFFER_SIZE 512
  18
  19 /* These addresses specify the realmode "BSS section" layout */
  20 #define BSS_EntryPoint      (BSS_START +  0)
  21 #define BSS_CallbackAddress (BSS_START +  4)
  22 #define BSS_CallbackReturn  (BSS_START +  8)
  23 #define BSS_BootDrive       (BSS_START + 12)
  24 #define BSS_BootPartition   (BSS_START + 16)
  25
  26
  27 // Flag Masks
  28 #define I386FLAG_CF             HEX(0001)  // Carry Flag
  29 #define I386FLAG_RESV1  HEX(0002)  // Reserved - Must be 1
  30 #define I386FLAG_PF             HEX(0004)  // Parity Flag
  31 #define I386FLAG_RESV2  HEX(0008)  // Reserved - Must be 0
  32 #define I386FLAG_AF             HEX(0010)  // Auxiliary Flag
  33 #define I386FLAG_RESV3  HEX(0020)  // Reserved - Must be 0
  34 #define I386FLAG_ZF             HEX(0040)  // Zero Flag
  35 #define I386FLAG_SF             HEX(0080)  // Sign Flag
  36 #define I386FLAG_TF             HEX(0100)  // Trap Flag (Single Step)
  37 #define I386FLAG_IF             HEX(0200)  // Interrupt Flag
  38 #define I386FLAG_DF             HEX(0400)  // Direction Flag
  39 #define I386FLAG_OF             HEX(0800)  // Overflow Flag
  40
  41 #define CR0_PE_SET      HEX(00000001)   /* OR this value with CR0 to enable pmode */
  42 #define CR0_PE_CLR      HEX(FFFFFFFE)   /* AND this value with CR0 to disable pmode */
  43
  44 /* Defines needed for switching between real and protected mode */
  45 //#ifdef _M_IX86
  46 #define NULL_DESC       HEX(00) /* NULL descriptor */
  47 #define PMODE_CS        HEX(08) /* PMode code selector, base 0 limit 4g */
  48 #define PMODE_DS        HEX(10) /* PMode data selector, base 0 limit 4g */
  49 #define RMODE_CS        HEX(18) /* RMode code selector, base 0 limit 64k */
  50 #define RMODE_DS        HEX(20) /* RMode data selector, base 0 limit 64k */
  51 //#endif
  52
  53 /* Makes "x" a global variable or label */
  54 #define EXTERN(x)       .global x; x: