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- #include <stdint.h>
- #include <io.h>
- #include <console.h>
-
- void pause ( void ) {
- printf ( "\nPress a key" );
- getchar();
- printf ( "\r \r" );
- }
-
- void more ( void ) {
- printf ( "---more---" );
- getchar();
- printf ( "\r \r" );
- }
-
- /* Produce a paged hex dump of the specified data and length */
- void hex_dump ( const unsigned char *data, const unsigned int len ) {
- unsigned int index;
- for ( index = 0; index < len; index++ ) {
- if ( ( index % 16 ) == 0 ) {
- printf ( "\n" );
- }
- if ( ( index % 368 ) == 352 ) {
- more();
- }
- if ( ( index % 16 ) == 0 ) {
- printf ( "%p [%lx] : %04x :", data + index,
- virt_to_phys ( data + index ), index );
- }
- printf ( " %02x", data[index] );
- }
- printf ( "\n" );
- }
-
- #define GUARD_SYMBOL ( ( 'M' << 24 ) | ( 'I' << 16 ) | ( 'N' << 8 ) | 'E' )
- /* Fill a region with guard markers. We use a 4-byte pattern to make
- * it less likely that check_region will find spurious 1-byte regions
- * of non-corruption.
- */
- void guard_region ( void *region, size_t len ) {
- uint32_t offset = 0;
-
- len &= ~0x03;
- for ( offset = 0; offset < len ; offset += 4 ) {
- *((uint32_t *)(region + offset)) = GUARD_SYMBOL;
- }
- }
-
- /* Check a region that has been guarded with guard_region() for
- * corruption.
- */
- int check_region ( void *region, size_t len ) {
- uint8_t corrupted = 0;
- uint8_t in_corruption = 0;
- uint32_t offset = 0;
- uint32_t test = 0;
-
- len &= ~0x03;
- for ( offset = 0; offset < len ; offset += 4 ) {
- test = *((uint32_t *)(region + offset)) = GUARD_SYMBOL;
- if ( ( in_corruption == 0 ) &&
- ( test != GUARD_SYMBOL ) ) {
- /* Start of corruption */
- if ( corrupted == 0 ) {
- corrupted = 1;
- printf ( "Region %p-%p (physical %#lx-%#lx) "
- "corrupted\n",
- region, region + len,
- virt_to_phys ( region ),
- virt_to_phys ( region + len ) );
- }
- in_corruption = 1;
- printf ( "--- offset %#lx ", offset );
- } else if ( ( in_corruption != 0 ) &&
- ( test == GUARD_SYMBOL ) ) {
- /* End of corruption */
- in_corruption = 0;
- printf ( "to offset %#lx", offset );
- }
-
- }
- if ( in_corruption != 0 ) {
- printf ( "to offset %#x (end of region)\n", len-1 );
- }
- return corrupted;
- }
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