memmap.h File Reference

Memory mapping. More...

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	memory_region
	A usable memory region. More...
struct	memory_map
	A memory map. More...
Defines
#define	MAX_MEMORY_REGIONS   8
	Maximum number of memory regions we expect to encounter.
Functions
	FILE_LICENCE (GPL2_OR_LATER)
void	get_memmap (struct memory_map *memmap)
	Get memory map.

---

Detailed Description

Memory mapping.

Definition in file memmap.h.

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Define Documentation

#define MAX_MEMORY_REGIONS   8

Maximum number of memory regions we expect to encounter.

Definition at line 24 of file memmap.h.

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Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

void get_memmap

(

struct memory_map *

memmap

)

Get memory map.

Parameters:

memmap

Memory map to fill in

Definition at line 285 of file memmap.c.

References basememsize(), memory_map::count, DBG, memory_region::end, extmemsize(), meme820(), memset(), memory_map::regions, and memory_region::start.

Referenced by com32_exec(), hide_etherboot(), init_eheap(), int13_boot(), multiboot_build_memmap(), phys_ram_within_limit(), prep_segment(), relocate(), and umalloc_test().

                                              {
        unsigned int basemem, extmem;
        int rc;

        DBG ( "Fetching system memory map\n" );

        /* Clear memory map */
        memset ( memmap, 0, sizeof ( *memmap ) );

        /* Get base and extended memory sizes */
        basemem = basememsize();
        DBG ( "FBMS base memory size %d kB [0,%x)\n",
              basemem, ( basemem * 1024 ) );
        extmem = extmemsize();
        
        /* Try INT 15,e820 first */
        if ( ( rc = meme820 ( memmap ) ) == 0 ) {
                DBG ( "Obtained system memory map via INT 15,e820\n" );
                return;
        }

        /* Fall back to constructing a map from basemem and extmem sizes */
        DBG ( "INT 15,e820 failed; constructing map\n" );
        memmap->regions[0].end = ( basemem * 1024 );
        memmap->regions[1].start = 0x100000;
        memmap->regions[1].end = 0x100000 + ( extmem * 1024 );
        memmap->count = 2;
}