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#include "io.h"
#include "load_buffer.h"
/*
* Initialise a buffer in an unused portion of memory, to be used for
* loading an image
*
*/
#ifdef KEEP_IT_REAL
/*
* Under KEEP_IT_REAL, always use 07c0:0000 as the load buffer.
*
*/
int init_load_buffer ( struct buffer *buffer ) {
buffer->start = 0x7c00;
buffer->end = 0xa0000;
DBG ( "LOAD_BUFFER using [%x,%x)\n", buffer->start, buffer->end );
init_buffer ( buffer );
return 1;
}
void trim_load_buffer ( struct buffer *buffer ) {
/* Nothing to do */
}
void done_load_buffer ( struct buffer *buffer ) {
/* Nothing to do */
}
#else /* KEEP_IT_REAL */
/*
* Without KEEP_IT_REAL, use all remaining heap space as the load buffer.
*
*/
int init_load_buffer ( struct buffer *buffer ) {
void *data;
size_t size;
data = emalloc_all ( &size );
if ( ! data )
return 0;
buffer->start = virt_to_phys ( data );
buffer->end = buffer->start + size;
DBG ( "LOAD_BUFFER using [%x,%x)\n", buffer->start, buffer->end );
init_buffer ( buffer );
return 1;
}
void trim_load_buffer ( struct buffer *buffer ) {
void *new_start;
/* Shrink buffer */
new_start = erealloc ( phys_to_virt ( buffer->start ), buffer->fill );
DBG ( "LOAD_BUFFER shrunk from [%x,%x) to [%x,%x)\n", buffer->start,
buffer->end, virt_to_phys ( new_start ), buffer->end );
buffer->start = virt_to_phys ( new_start );
}
void done_load_buffer ( struct buffer *buffer ) {
efree ( phys_to_virt ( buffer->start ) );
DBG ( "LOAD_BUFFER freed [%x,%x)\n", buffer->start, buffer->end );
}
#endif
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