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[multiboot] Use memmap_describe() to construct Multiboot memory map

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-05-15 23:34:39 +01:00
parent 25ab8f4629
commit d0adf3b4cc
1 changed files with 35 additions and 22 deletions
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57
src/arch/x86/image/multiboot.c
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@@ -38,7 +38,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <multiboot.h>
#include <ipxe/image.h>
#include <ipxe/segment.h>
#include <ipxe/io.h>
#include <ipxe/memmap.h>
#include <ipxe/elf.h>
#include <ipxe/init.h>
#include <ipxe/features.h>
@@ -59,6 +59,9 @@ FEATURE ( FEATURE_IMAGE, "MBOOT", DHCP_EB_FEATURE_MULTIBOOT, 1 );
*/
#define MAX_MODULES 8
/** Maximum number of memory map entries */
#define MAX_MEMMAP 8
/**
* Maximum combined length of command lines
*
@@ -106,32 +109,43 @@ static void multiboot_build_memmap ( struct image *image,
struct multiboot_info *mbinfo,
struct multiboot_memory_map *mbmemmap,
unsigned int limit ) {
struct memory_map memmap;
unsigned int i;
/* Get memory map */
get_memmap ( &memmap );
struct memmap_region region;
unsigned int remaining;
/* Translate into multiboot format */
memset ( mbmemmap, 0, sizeof ( *mbmemmap ) );
for ( i = 0 ; i < memmap.count ; i++ ) {
if ( i >= limit ) {
remaining = limit;
for_each_memmap ( &region, 0 ) {
/* Ignore any non-memory regions */
if ( ! ( region.flags & MEMMAP_FL_MEMORY ) )
continue;
memmap_dump ( &region );
/* Check Multiboot memory map limit */
if ( ! remaining ) {
DBGC ( image, "MULTIBOOT %s limit of %d memmap "
"entries reached\n", image->name, limit );
break;
}
mbmemmap[i].size = ( sizeof ( mbmemmap[i] ) -
sizeof ( mbmemmap[i].size ) );
mbmemmap[i].base_addr = memmap.regions[i].start;
mbmemmap[i].length = ( memmap.regions[i].end -
memmap.regions[i].start );
mbmemmap[i].type = MBMEM_RAM;
mbinfo->mmap_length += sizeof ( mbmemmap[i] );
if ( memmap.regions[i].start == 0 )
mbinfo->mem_lower = ( memmap.regions[i].end / 1024 );
if ( memmap.regions[i].start == 0x100000 )
mbinfo->mem_upper = ( ( memmap.regions[i].end -
0x100000 ) / 1024 );
/* Populate Multiboot memory map entry */
mbmemmap->size = ( sizeof ( *mbmemmap ) -
sizeof ( mbmemmap->size ) );
mbmemmap->base_addr = region.addr;
mbmemmap->length = memmap_size ( &region );
mbmemmap->type = MBMEM_RAM;
/* Update Multiboot information */
mbinfo->mmap_length += sizeof ( *mbmemmap );
if ( mbmemmap->base_addr == 0 )
mbinfo->mem_lower = ( mbmemmap->length / 1024 );
if ( mbmemmap->base_addr == 0x100000 )
mbinfo->mem_upper = ( mbmemmap->length / 1024 );
/* Move to next Multiboot memory map entry */
mbmemmap++;
remaining--;
}
}
@@ -247,8 +261,7 @@ static char __bss16_array ( mb_bootloader_name, [32] );
#define mb_bootloader_name __use_data16 ( mb_bootloader_name )
/** The multiboot memory map */
static struct multiboot_memory_map
__bss16_array ( mbmemmap, [MAX_MEMORY_REGIONS] );
static struct multiboot_memory_map __bss16_array ( mbmemmap, [MAX_MEMMAP] );
#define mbmemmap __use_data16 ( mbmemmap )
/** The multiboot module list */