OvmfPkg/Library/PlatformDebugLibIoPort/DebugLib.c

   1 /** @file
   2   Base Debug library instance for QEMU debug port.
   3   It uses PrintLib to send debug messages to a fixed I/O port.
   4
   5   Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
   6   Copyright (c) 2012, Red Hat, Inc.<BR>
   7   This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php.
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17 #include <Base.h>
  18 #include <Uefi.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/BaseLib.h>
  21 #include <Library/IoLib.h>
  22 #include <Library/PrintLib.h>
  23 #include <Library/PcdLib.h>
  24 #include <Library/BaseMemoryLib.h>
  25 #include <Library/DebugPrintErrorLevelLib.h>
  26
  27 //
  28 // Define the maximum debug and assert message length that this library supports
  29 //
  30 #define MAX_DEBUG_MESSAGE_LENGTH  0x100
  31
  32 /**
  33   This constructor function does not have to do anything.
  34
  35   @retval EFI_SUCCESS   The constructor always returns RETURN_SUCCESS.
  36
  37 **/
  38 RETURN_STATUS
  39 EFIAPI
  40 PlatformDebugLibIoPortConstructor (
  41   VOID
  42   )
  43 {
  44   return EFI_SUCCESS;
  45 }
  46
  47 /**
  48   Prints a debug message to the debug output device if the specified error level is enabled.
  49
  50   If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
  51   GetDebugPrintErrorLevel (), then print the message specified by Format and the
  52   associated variable argument list to the debug output device.
  53
  54   If Format is NULL, then ASSERT().
  55
  56   @param  ErrorLevel  The error level of the debug message.
  57   @param  Format      Format string for the debug message to print.
  58   @param  ...         Variable argument list whose contents are accessed
  59                       based on the format string specified by Format.
  60
  61 **/
  62 VOID
  63 EFIAPI
  64 DebugPrint (
  65   IN  UINTN        ErrorLevel,
  66   IN  CONST CHAR8  *Format,
  67   ...
  68   )
  69 {
  70   CHAR8    Buffer[MAX_DEBUG_MESSAGE_LENGTH];
  71   VA_LIST  Marker;
  72   UINTN    Length;
  73
  74   //
  75   // If Format is NULL, then ASSERT().
  76   //
  77   ASSERT (Format != NULL);
  78
  79   //
  80   // Check driver debug mask value and global mask
  81   //
  82   if ((ErrorLevel & GetDebugPrintErrorLevel ()) == 0) {
  83     return;
  84   }
  85
  86   //
  87   // Convert the DEBUG() message to an ASCII String
  88   //
  89   VA_START (Marker, Format);
  90   Length = AsciiVSPrint (Buffer, sizeof (Buffer), Format, Marker);
  91   VA_END (Marker);
  92
  93   //
  94   // Send the print string to the debug I/O port
  95   //
  96   IoWriteFifo8 (PcdGet16 (PcdDebugIoPort), Length, Buffer);
  97 }
  98
  99
 100 /**
 101   Prints an assert message containing a filename, line number, and description.
 102   This may be followed by a breakpoint or a dead loop.
 103
 104   Print a message of the form "ASSERT <FileName>(<LineNumber>): <Description>\n"
 105   to the debug output device.  If DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED bit of
 106   PcdDebugProperyMask is set then CpuBreakpoint() is called. Otherwise, if
 107   DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED bit of PcdDebugProperyMask is set then
 108   CpuDeadLoop() is called.  If neither of these bits are set, then this function
 109   returns immediately after the message is printed to the debug output device.
 110   DebugAssert() must actively prevent recursion.  If DebugAssert() is called while
 111   processing another DebugAssert(), then DebugAssert() must return immediately.
 112
 113   If FileName is NULL, then a <FileName> string of "(NULL) Filename" is printed.
 114   If Description is NULL, then a <Description> string of "(NULL) Description" is printed.
 115
 116   @param  FileName     The pointer to the name of the source file that generated the assert condition.
 117   @param  LineNumber   The line number in the source file that generated the assert condition
 118   @param  Description  The pointer to the description of the assert condition.
 119
 120 **/
 121 VOID
 122 EFIAPI
 123 DebugAssert (
 124   IN CONST CHAR8  *FileName,
 125   IN UINTN        LineNumber,
 126   IN CONST CHAR8  *Description
 127   )
 128 {
 129   CHAR8  Buffer[MAX_DEBUG_MESSAGE_LENGTH];
 130   UINTN  Length;
 131
 132   //
 133   // Generate the ASSERT() message in Ascii format
 134   //
 135   Length = AsciiSPrint (Buffer, sizeof Buffer, "ASSERT %a(%Lu): %a\n",
 136              FileName, (UINT64)LineNumber, Description);
 137
 138   //
 139   // Send the print string to the debug I/O port
 140   //
 141   IoWriteFifo8 (PcdGet16 (PcdDebugIoPort), Length, Buffer);
 142
 143   //
 144   // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings
 145   //
 146   if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {
 147     CpuBreakpoint ();
 148   } else if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {
 149     CpuDeadLoop ();
 150   }
 151 }
 152
 153
 154 /**
 155   Fills a target buffer with PcdDebugClearMemoryValue, and returns the target buffer.
 156
 157   This function fills Length bytes of Buffer with the value specified by
 158   PcdDebugClearMemoryValue, and returns Buffer.
 159
 160   If Buffer is NULL, then ASSERT().
 161   If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
 162
 163   @param   Buffer  The pointer to the target buffer to be filled with PcdDebugClearMemoryValue.
 164   @param   Length  The number of bytes in Buffer to fill with zeros PcdDebugClearMemoryValue.
 165
 166   @return  Buffer  The pointer to the target buffer filled with PcdDebugClearMemoryValue.
 167
 168 **/
 169 VOID *
 170 EFIAPI
 171 DebugClearMemory (
 172   OUT VOID  *Buffer,
 173   IN UINTN  Length
 174   )
 175 {
 176   //
 177   // If Buffer is NULL, then ASSERT().
 178   //
 179   ASSERT (Buffer != NULL);
 180
 181   //
 182   // SetMem() checks for the the ASSERT() condition on Length and returns Buffer
 183   //
 184   return SetMem (Buffer, Length, PcdGet8(PcdDebugClearMemoryValue));
 185 }
 186
 187
 188 /**
 189   Returns TRUE if ASSERT() macros are enabled.
 190
 191   This function returns TRUE if the DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of
 192   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 193
 194   @retval  TRUE    The DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of PcdDebugProperyMask is set.
 195   @retval  FALSE   The DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of PcdDebugProperyMask is clear.
 196
 197 **/
 198 BOOLEAN
 199 EFIAPI
 200 DebugAssertEnabled (
 201   VOID
 202   )
 203 {
 204   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED) != 0);
 205 }
 206
 207
 208 /**
 209   Returns TRUE if DEBUG() macros are enabled.
 210
 211   This function returns TRUE if the DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of
 212   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 213
 214   @retval  TRUE    The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is set.
 215   @retval  FALSE   The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is clear.
 216
 217 **/
 218 BOOLEAN
 219 EFIAPI
 220 DebugPrintEnabled (
 221   VOID
 222   )
 223 {
 224   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_PRINT_ENABLED) != 0);
 225 }
 226
 227
 228 /**
 229   Returns TRUE if DEBUG_CODE() macros are enabled.
 230
 231   This function returns TRUE if the DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of
 232   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 233
 234   @retval  TRUE    The DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of PcdDebugProperyMask is set.
 235   @retval  FALSE   The DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of PcdDebugProperyMask is clear.
 236
 237 **/
 238 BOOLEAN
 239 EFIAPI
 240 DebugCodeEnabled (
 241   VOID
 242   )
 243 {
 244   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_CODE_ENABLED) != 0);
 245 }
 246
 247
 248 /**
 249   Returns TRUE if DEBUG_CLEAR_MEMORY() macro is enabled.
 250
 251   This function returns TRUE if the DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of
 252   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 253
 254   @retval  TRUE    The DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of PcdDebugProperyMask is set.
 255   @retval  FALSE   The DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of PcdDebugProperyMask is clear.
 256
 257 **/
 258 BOOLEAN
 259 EFIAPI
 260 DebugClearMemoryEnabled (
 261   VOID
 262   )
 263 {
 264   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED) != 0);
 265 }
 266
 267 /**
 268   Returns TRUE if any one of the bit is set both in ErrorLevel and PcdFixedDebugPrintErrorLevel.
 269
 270   This function compares the bit mask of ErrorLevel and PcdFixedDebugPrintErrorLevel.
 271
 272   @retval  TRUE    Current ErrorLevel is supported.
 273   @retval  FALSE   Current ErrorLevel is not supported.
 274
 275 **/
 276 BOOLEAN
 277 EFIAPI
 278 DebugPrintLevelEnabled (
 279   IN  CONST UINTN        ErrorLevel
 280   )
 281 {
 282   return (BOOLEAN) ((ErrorLevel & PcdGet32(PcdFixedDebugPrintErrorLevel)) != 0);
 283 }