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Added debugging

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This commit is contained in:
Michael Brown 2005-05-09 13:47:04 +00:00
parent b2869ed6b8
commit a89651f3bb
1 changed files with 16 additions and 1 deletions
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17
src/core/buffer.c
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@ -41,6 +41,8 @@ void init_buffer ( struct buffer *buffer, physaddr_t start, size_t len ) {
char tail = 1;
copy_to_phys ( start, &tail, sizeof ( tail ) );
}
DBG ( "BUFFER [%x,%x) initialised\n", buffer->start, buffer->end );
}
/*
@ -57,6 +59,9 @@ static void split_free_block ( struct buffer_free_block *desc,
if ( split >= desc->end )
return;
DBG ( "BUFFER splitting [%x,%x) into [%x,%x) and [%x,%x)\n",
block, desc->end, block, split, split, desc->end );
/* Create descriptor for new free block */
copy_to_phys ( split, &desc->tail, sizeof ( desc->tail ) );
if ( ! desc->tail )
@ -80,6 +85,8 @@ static inline void unfree_block ( struct buffer *buffer,
/* If this is the first block, just update first_free */
if ( ! prev_block ) {
DBG ( "BUFFER marking [%x,%x) as used\n",
buffer->first_free, desc->end );
buffer->first_free = desc->next_free;
return;
}
@ -87,6 +94,9 @@ static inline void unfree_block ( struct buffer *buffer,
/* Get descriptor for previous block (which cannot be a tail block) */
copy_from_phys ( &prev_desc, prev_block, sizeof ( prev_desc ) );
DBG ( "BUFFER marking [%x,%x) as used\n",
prev_desc.next_free, desc->end );
/* Modify descriptor for previous block and write it back */
prev_desc.next_free = desc->next_free;
copy_to_phys ( prev_block, &prev_desc, sizeof ( prev_desc ) );
@ -114,6 +124,8 @@ off_t fill_buffer ( struct buffer *buffer, void *data,
/* Calculate start and end addresses of data */
data_start = buffer->start + offset;
data_end = data_start + len;
DBG ( "BUFFER [%x,%x) writing portion [%x,%x)\n",
buffer->start, buffer->end, data_start, data_end );
/* Iterate through the buffer's free blocks */
prev_block = 0;
@ -133,7 +145,7 @@ off_t fill_buffer ( struct buffer *buffer, void *data,
/* Block is now either completely contained by or
* completely outside the data area
*/
if ( ( block >= data_start ) && ( block <= data_end ) ) {
if ( ( block >= data_start ) && ( block < data_end ) ) {
/* Block is within the data area */
unfree_block ( buffer, &desc, prev_block );
copy_to_phys ( block, data + ( block - data_start ),
@ -147,5 +159,8 @@ off_t fill_buffer ( struct buffer *buffer, void *data,
block = desc.next_free;
}
DBG ( "BUFFER [%x,%x) full up to %x\n",
buffer->start, buffer->end, buffer->first_free );
return ( buffer->first_free - buffer->start );
}