1 files changed, 181 insertions, 0 deletions
diff --git a/gnu-efi/gnu-efi-3.0/lib/ia32/math.c b/gnu-efi/gnu-efi-3.0/lib/ia32/math.c
new file mode 100644
index 0000000..4f40388
--- /dev/null
+++ b/gnu-efi/gnu-efi-3.0/lib/ia32/math.c
@@ -0,0 +1,181 @@
+/*++
+
+Copyright (c) 1998  Intel Corporation
+
+Module Name:
+
+    math.c
+
+Abstract:
+
+
+
+
+Revision History
+
+--*/
+
+#include "lib.h"
+
+
+//
+// Declare runtime functions
+//
+
+#ifdef RUNTIME_CODE
+#ifndef __GNUC__
+#pragma RUNTIME_CODE(LShiftU64)
+#pragma RUNTIME_CODE(RShiftU64)
+#pragma RUNTIME_CODE(MultU64x32)
+#pragma RUNTIME_CODE(DivU64x32)
+#endif
+#endif
+
+//
+//
+//
+
+UINT64
+LShiftU64 (
+    IN UINT64   Operand,
+    IN UINTN    Count
+    )
+// Left shift 64bit by 32bit and get a 64bit result
+{
+#ifdef __GNUC__
+    return Operand << Count;
+#else
+    UINT64      Result;
+    _asm {
+        mov     eax, dword ptr Operand[0]
+        mov     edx, dword ptr Operand[4]
+        mov     ecx, Count
+        and     ecx, 63
+
+        shld    edx, eax, cl
+        shl     eax, cl
+
+        cmp     ecx, 32
+        jc      short ls10
+
+        mov     edx, eax
+        xor     eax, eax
+
+ls10:
+        mov     dword ptr Result[0], eax
+        mov     dword ptr Result[4], edx
+    }
+
+    return Result;
+#endif
+}
+
+UINT64
+RShiftU64 (
+    IN UINT64   Operand,
+    IN UINTN    Count
+    )
+// Right shift 64bit by 32bit and get a 64bit result
+{
+#ifdef __GNUC__
+    return Operand >> Count;
+#else
+    UINT64      Result;
+    _asm {
+        mov     eax, dword ptr Operand[0]
+        mov     edx, dword ptr Operand[4]
+        mov     ecx, Count
+        and     ecx, 63
+
+        shrd    eax, edx, cl
+        shr     edx, cl
+
+        cmp     ecx, 32
+        jc      short rs10
+
+        mov     eax, edx
+        xor     edx, edx
+
+rs10:
+        mov     dword ptr Result[0], eax
+        mov     dword ptr Result[4], edx
+    }
+
+    return Result;
+#endif
+}
+
+
+UINT64
+MultU64x32 (
+    IN UINT64   Multiplicand,
+    IN UINTN    Multiplier
+    )
+// Multiple 64bit by 32bit and get a 64bit result
+{
+#ifdef __GNUC__
+    return Multiplicand * Multiplier;
+#else
+    UINT64      Result;
+    _asm {
+        mov     eax, dword ptr Multiplicand[0]
+        mul     Multiplier
+        mov     dword ptr Result[0], eax
+        mov     dword ptr Result[4], edx
+        mov     eax, dword ptr Multiplicand[4]
+        mul     Multiplier
+        add     dword ptr Result[4], eax
+    }
+
+    return Result;
+#endif
+}
+
+UINT64
+DivU64x32 (
+    IN UINT64   Dividend,
+    IN UINTN    Divisor,
+    OUT UINTN   *Remainder OPTIONAL
+    )
+// divide 64bit by 32bit and get a 64bit result
+// N.B. only works for 31bit divisors!!
+{
+#ifdef __GNUC__
+    if (Remainder)
+	*Remainder = Dividend % Divisor;
+    return Dividend / Divisor;
+#else
+    UINT32      Rem;
+    UINT32      bit;        
+
+    ASSERT (Divisor != 0);
+    ASSERT ((Divisor >> 31) == 0);
+
+    //
+    // For each bit in the dividend
+    //
+
+    Rem = 0;
+    for (bit=0; bit < 64; bit++) {
+        _asm {
+            shl     dword ptr Dividend[0], 1    ; shift rem:dividend left one
+            rcl     dword ptr Dividend[4], 1    
+            rcl     dword ptr Rem, 1            
+
+            mov     eax, Rem
+            cmp     eax, Divisor                ; Is Rem >= Divisor?
+            cmc                                 ; No - do nothing
+            sbb     eax, eax                    ; Else, 
+            sub     dword ptr Dividend[0], eax  ;   set low bit in dividen
+            and     eax, Divisor                ; and
+            sub     Rem, eax                    ;   subtract divisor 
+        }
+    }
+
+    if (Remainder) {
+        *Remainder = Rem;
+    }
+
+    return Dividend;
+#endif
+}