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[bios] Use memmap_describe() to find an external heap location

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-05-16 18:04:27 +01:00
parent 79c30b92a3
commit 624d76e26d
1 changed files with 14 additions and 16 deletions
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30
src/arch/x86/interface/pcbios/memtop_umalloc.c
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@@ -34,7 +34,6 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <string.h>
#include <errno.h>
#include <ipxe/uaccess.h>
#include <ipxe/io.h>
#include <ipxe/memblock.h>
#include <ipxe/memmap.h>
#include <ipxe/umalloc.h>
@@ -85,35 +84,34 @@ static void hide_umalloc ( physaddr_t start, physaddr_t end ) {
* @ret len Length of region
*/
size_t largest_memblock ( void **start ) {
struct memory_map memmap;
struct memory_region *region;
struct memmap_region region;
physaddr_t max = EM_MAX_ADDRESS;
physaddr_t region_start;
physaddr_t region_end;
size_t region_len;
unsigned int i;
size_t len = 0;
/* Avoid returning uninitialised data on error */
*start = NULL;
/* Scan through all memory regions */
get_memmap ( &memmap );
for ( i = 0 ; i < memmap.count ; i++ ) {
region = &memmap.regions[i];
DBG ( "Considering [%llx,%llx)\n", region->start, region->end );
for_each_memmap ( &region, 1 ) {
/* Truncate block to maximum physical address */
if ( region->start > max ) {
DBG ( "...starts after maximum address %lx\n", max );
continue;
memmap_dump ( &region );
if ( region.addr > max ) {
DBGC ( &region, "...starts after maximum address "
"%lx\n", max );
break;
}
region_start = region->start;
if ( region->end > max ) {
DBG ( "...end truncated to maximum address %lx\n", max);
region_start = region.addr;
if ( ! memmap_is_usable ( &region ) )
continue;
region_end = ( region_start + memmap_size ( &region ) );
if ( region_end > max ) {
DBGC ( &region, "...end truncated to maximum address "
"%lx\n", max);
region_end = 0; /* =max, given the wraparound */
} else {
region_end = region->end;
}
region_len = ( region_end - region_start );