reactos/ntoskrnl/hal/x86/usercall.c

   1 #include <windows.h>
   2 #include <internal/ntoskrnl.h>
   3 #include <internal/ke.h>
   4 #include <internal/symbol.h>
   5 #include <internal/i386/segment.h>
   6 #include <internal/mmhal.h>
   7
   8 #define NDEBUG
   9 #include <internal/debug.h>
  10 #include <internal/service.h>
  11
  12 /* The service dispatcher will take the service number passed in
  13  * by the user mode process, logical and it with ServiceNumberMask
  14  * and compare the resulting value with ServiceNumberValue.  If the
  15  * value matches, The passed service number will be and'ed with the
  16  * inverse of ServiceNumberMask to obtain the index into the ServiceTable
  17  * for the service to call
  18  */
  19 typedef struct _HAL_DISPATCH_TABLE_ENTRY
  20 {
  21   DWORD  ServiceNumberMask;
  22   DWORD  ServiceNumberValue;
  23   PSERVICE_TABLE  ServiceTable;
  24   DWORD  TableCount;
  25 } HAL_DISPATCH_TABLE_ENTRY, *PHAL_DISPATCH_TABLE_ENTRY;
  26
  27 static KSPIN_LOCK DispatchTableLock = {0,};
  28 static DWORD DispatchTableCount = 0;
  29 static HAL_DISPATCH_TABLE_ENTRY DispatchTables[16];
  30
  31 NTSTATUS HalRegisterServiceTable(DWORD  Mask,
  32                                  DWORD  Value,
  33                                  PSERVICE_TABLE  Table,
  34                                  DWORD  Count)
  35 {
  36   NTSTATUS  Status;
  37   KIRQL  OldLvl;
  38
  39   KeAcquireSpinLock(&DispatchTableLock, &OldLvl);
  40
  41   Status = STATUS_SUCCESS;
  42
  43   /* FIXME: should check for invalid/overlapping service tables  */
  44   DispatchTables[DispatchTableCount].ServiceNumberMask = Mask;
  45   DispatchTables[DispatchTableCount].ServiceNumberValue = Value;
  46   DispatchTables[DispatchTableCount].ServiceTable = Table;
  47   DispatchTables[DispatchTableCount].TableCount = Count;
  48   DispatchTableCount++;
  49
  50   KeReleaseSpinLock(&DispatchTableLock, OldLvl);
  51
  52   return  Status;
  53 }
  54
  55 #define _STR(x) #x
  56 #define STR(x) _STR(x)
  57
  58 void PsBeginThreadWithContextInternal(void);
  59    __asm__(
  60      "\n\t.global _PsBeginThreadWithContextInternal\n\t"
  61      "_PsBeginThreadWithContextInternal:\n\t"
  62      "pushl $0\n\t"
  63      "call _KeLowerIrql\n\t"
  64      "popl %eax\n\t"
  65      "popl %eax\n\t"
  66      "popl %eax\n\t"
  67      "popl %eax\n\t"
  68      "popl %eax\n\t"
  69      "popl %eax\n\t"
  70      "popl %eax\n\t"
  71      "popl %eax\n\t"
  72      "addl $112,%esp\n\t"
  73      "popl %gs\n\t"
  74      "popl %fs\n\t"
  75      "popl %es\n\t"
  76      "popl %ds\n\t"
  77      "popl %edi\n\t"
  78      "popl %esi\n\t"
  79      "popl %ebx\n\t"
  80      "popl %edx\n\t"
  81      "popl %ecx\n\t"
  82      "popl %eax\n\t"
  83      "popl %ebp\n\t"
  84      "iret\n\t");
  85
  86 void interrupt_handler2e(void);
  87    __asm__("\n\t.global _interrupt_handler2e\n\t"
  88            "_interrupt_handler2e:\n\t"
  89
  90            /*  Save the users context  */
  91            "pushl %ds\n\t"
  92            "pushl %es\n\t"
  93            "pushl %esi\n\t"
  94            "pushl %edi\n\t"
  95            "pushl %ebp\n\t"
  96            "pushl %ebx\n\t"
  97
  98            /*  Set ES to kernel segment  */
  99            "movw  $"STR(KERNEL_DS)",%bx\n\t"
 100            "movw %bx,%es\n\t"
 101
 102            /*  Allocate new Kernel stack frame  */
 103            "movl %esp,%ebp\n\t"
 104
 105            /*  Users's current stack frame pointer is source  */
 106            "movl %edx,%esi\n\t"
 107
 108            /* FIXME: determine system service table to use  */
 109            /* FIXME: chech to see if SS is valid/inrange  */
 110
 111            /*  Allocate room for argument list from kernel stack  */
 112            "movl %es:__SystemServiceTable(,%eax,8),%ecx\n\t"
 113            "subl %ecx,%esp\n\t"
 114
 115            /*  Copy the arguments from the user stack to the kernel stack  */
 116            "movl %esp,%edi\n\t"
 117            "rep\n\tmovsb\n\t"
 118
 119            /*  DS is now also kernel segment  */
 120            "movw %bx,%ds\n\t"
 121
 122            /*  Make the system service call  */
 123            "movl %ds:__SystemServiceTable+4(,%eax,8),%eax\n\t"
 124            "call *%eax\n\t"
 125
 126            /*  Deallocate the kernel stack frame  */
 127            "movl %ebp,%esp\n\t"
 128
 129            /*  Restore the user context  */
 130            "popl %ebx\n\t"
 131            "popl %ebp\n\t"
 132            "popl %edi\n\t"
 133            "popl %esi\n\t"
 134            "popl %es\n\t"
 135            "popl %ds\n\t"
 136            "iret\n\t");
 137
 138