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First versions
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49
src/core/image.c
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49
src/core/image.c
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#include "buffer.h"
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#include "image.h"
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static struct image images_start[0] __image_start;
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static struct image images_end[0] __image_end;
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/*
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* Identify the image format
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*
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*/
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static struct image * identify_image ( struct buffer *buffer ) {
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struct image_header header;
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int header_len = sizeof ( header );
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off_t len;
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struct image *image;
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/* Copy first (up to) 512 bytes of image to easily-accessible
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* buffer.
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*/
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len = buffer->fill;
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copy_from_phys ( &header, buffer->start,
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len < header_len ? len : header_len );
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for ( image = images_start ; image < images_end ; image++ ) {
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if ( image->probe ( &header, len ) )
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return image;
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}
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return NULL;
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}
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/*
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* Boot a loaded image
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*
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*/
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int boot_image ( struct buffer *buffer ) {
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struct image *image;
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image = identify_image ( buffer );
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if ( ! image ) {
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DBG ( "IMAGE could not identify image format\n" );
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return 0;
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}
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DBG ( "IMAGE found %s image (length %d)\n",
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image->name, buffer->fill );
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return image->boot ( buffer->start, buffer->fill );
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}
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25
src/include/image.h
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25
src/include/image.h
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#ifndef IMAGE_H
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#define IMAGE_H
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#include "stdint.h"
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#include "io.h"
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#include "tables.h"
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#define IMAGE_HEADER_SIZE 512
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struct image_header {
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char data[IMAGE_HEADER_SIZE];
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};
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struct image {
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char *name;
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int ( * probe ) ( struct image_header *header, off_t len );
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int ( * boot ) ( physaddr_t start, off_t len );
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};
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#define __image_start __table_start(image)
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#define __image __table(image,01)
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#define __default_image __table(image,02)
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#define __image_end __table_end(image)
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#endif /* IMAGE_H */
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