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 //#ifdef _M_AMD64
   8 #define PML4_ADDRESS        HEX(1000) /* One page PML4 page table */
   9 #define PDP_ADDRESS         HEX(2000) /* One page PDP page table */
  10 #define PD_ADDRESS          HEX(3000) /* One page PD page table */
  11 //#endif
  12 #define STACK16ADDR         HEX(6F00) /* The 16-bit stack top will be at 0000:6F00 */
  13 #define BSS_START           HEX(6F00)
  14 #define FREELDR_BASE        HEX(F800)
  15 #define FREELDR_PE_BASE    HEX(10000)
  16 #define DISKREADBUFFER     HEX(80000) /* Buffer to store data read in from the disk via the BIOS */
  17 #define STACKLOWLIMIT      HEX(90000)
  18 #define STACK32ADDR        HEX(98000) /* The 32-bit stack top will be at 9000:8000, or 0xA8000 */
  19 #define STACK64ADDR            HEX(98000) /* The 64-bit stack top will be at 98000 */
  20 #define BIOSCALLBUFFER     HEX(98000) /* Buffer to store temporary data for any Int386() call */
  21 #define DISKREADBUFFER_SIZE HEX(10000)
  22
  23 #define BIOSCALLBUFSEGMENT (BIOSCALLBUFFER/16) /* Buffer to store temporary data for any Int386() call */
  24 #define BIOSCALLBUFOFFSET   HEX(0000) /* Buffer to store temporary data for any Int386() call */
  25 #define BIOSCALLBUFSIZE     PAGE_SIZE /* max is sizeof(VESA_SVGA_INFO) = 512 */
  26 #define MAX_FREELDR_PE_SIZE (DISKREADBUFFER - FREELDR_PE_BASE)
  27
  28 /* These addresses specify the realmode "BSS section" layout */
  29 #define BSS_RealModeEntry        (BSS_START +  0)
  30 #define BSS_CallbackReturn       (BSS_START +  4)
  31 #define BSS_RegisterSet          (BSS_START +  8) /* size = 40 */
  32 #define BSS_IntVector            (BSS_START + 52)
  33 #define BSS_PxeEntryPoint        (BSS_START + 56)
  34 #define BSS_PxeBufferSegment     (BSS_START + 60)
  35 #define BSS_PxeBufferOffset      (BSS_START + 64)
  36 #define BSS_PxeFunction          (BSS_START + 68)
  37 #define BSS_PxeResult            (BSS_START + 72)
  38 #define BSS_PnpBiosEntryPoint    (BSS_START + 76)
  39 #define BSS_PnpBiosDataSegment   (BSS_START + 80)
  40 #define BSS_PnpBiosBufferSegment (BSS_START + 84)
  41 #define BSS_PnpBiosBufferOffset  (BSS_START + 88)
  42 #define BSS_PnpNodeSize          (BSS_START + 92)
  43 #define BSS_PnpNodeCount         (BSS_START + 96)
  44 #define BSS_PnpNodeNumber        (BSS_START + 100)
  45 #define BSS_PnpResult            (BSS_START + 104)
  46 #define BSS_BootDrive            (BSS_START + 108) // 1 byte
  47 #define BSS_BootPartition        (BSS_START + 109) // 1 byte
  48
  49
  50 /* Realmode function IDs */
  51 #define FNID_Int386 0
  52 #define FNID_Reboot 1
  53 #define FNID_ChainLoadBiosBootSectorCode 2
  54 #define FNID_PxeCallApi 3
  55 #define FNID_PnpBiosGetDeviceNodeCount 4
  56 #define FNID_PnpBiosGetDeviceNode 5
  57 #define FNID_BootLinuxKernel 6
  58
  59 /* Flag Masks */
  60 #define CR0_PE_SET      HEX(00000001)   /* OR this value with CR0 to enable pmode */
  61 #define CR0_PE_CLR      HEX(FFFFFFFE)   /* AND this value with CR0 to disable pmode */
  62
  63 /* Defines needed for switching between real and protected mode */
  64 //#ifdef _M_IX86
  65 #define NULL_DESC       HEX(00) /* NULL descriptor */
  66 #define PMODE_CS        HEX(08) /* PMode code selector, base 0 limit 4g */
  67 #define PMODE_DS        HEX(10) /* PMode data selector, base 0 limit 4g */
  68 #define RMODE_CS        HEX(18) /* RMode code selector, base 0 limit 64k */
  69 #define RMODE_DS        HEX(20) /* RMode data selector, base 0 limit 64k */
  70 //#else
  71 /* Long mode selectors */
  72 #define LMODE_CS HEX(10)
  73 #define LMODE_DS HEX(18)
  74 #define CMODE_CS HEX(30)
  75 //#endif
  76
  77 /* Makes "x" a global variable or label */
  78 #define EXTERN(x)       .global x; x: