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Populate multiboot information structure before calling OS.

This commit is contained in:
Michael Brown 2007-01-11 21:21:02 +00:00
parent ddbc60b5ae
commit f31d91bce5
1 changed files with 39 additions and 17 deletions
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56
src/arch/i386/image/multiboot.c
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@ -28,20 +28,9 @@
#include <gpxe/uaccess.h>
#include <gpxe/image.h>
#include <gpxe/segment.h>
#include <gpxe/memmap.h>
#include <gpxe/elf.h>
/** Boot modules must be page aligned */
#define MB_FLAG_PGALIGN 0x00000001
/** Memory map must be provided */
#define MB_FLAG_MEMMAP 0x00000002
/** Video mode information must be provided */
#define MB_FLAG_VIDMODE 0x00000004
/** Image is a raw multiboot image (not ELF) */
#define MB_FLAG_RAW 0x00010000
/** Multiboot flags that we support */
#define MB_SUPPORTED_FLAGS ( MB_FLAG_PGALIGN | MB_FLAG_MEMMAP | \
MB_FLAG_VIDMODE | MB_FLAG_RAW )
@ -75,18 +64,51 @@ struct multiboot_header_info {
* @ret rc Return status code
*/
static int multiboot_execute ( struct image *image ) {
static const char *bootloader_name = "gPXE " VERSION;
struct multiboot_info mbinfo;
struct memory_map memmap;
struct multiboot_memory_map mbmemmap[ sizeof ( memmap.regions ) /
sizeof ( memmap.regions[0] ) ];
unsigned int i;
/* Populate multiboot information structure */
memset ( &mbinfo, 0, sizeof ( mbinfo ) );
/* Set boot loader name */
mbinfo.flags |= MBI_FLAG_LOADER;
mbinfo.boot_loader_name = virt_to_phys ( bootloader_name );
/* Get memory map */
get_memmap ( &memmap );
memset ( mbmemmap, 0, sizeof ( mbmemmap ) );
for ( i = 0 ; i < memmap.count ; i++ ) {
mbmemmap[i].size = sizeof ( mbmemmap[i] );
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;
if ( memmap.regions[i].start == 0x100000 )
mbinfo.mem_upper = ( memmap.regions[i].end - 0x100000);
}
mbinfo.flags |= ( MBI_FLAG_MEM | MBI_FLAG_MMAP );
mbinfo.mmap_addr = virt_to_phys ( &mbmemmap[0].base_addr );
/* Set command line, if present */
if ( image->cmdline ) {
mbinfo.flags |= MBI_FLAG_CMDLINE;
mbinfo.cmdline = virt_to_phys ( image->cmdline );
}
/* Jump to OS with flat physical addressing */
__asm__ ( PHYS_CODE ( "call *%%edi\n\t" )
: : "a" ( MULTIBOOT_BOOTLOADER_MAGIC ),
"b" ( virt_to_phys ( &mbinfo ) ),
"D" ( image->entry )
: "ecx", "edx", "esi", "ebp" );
__asm__ __volatile__ ( PHYS_CODE ( "xchgw %%bx,%%bx\n\t"
"call *%%edi\n\t" )
: : "a" ( MULTIBOOT_BOOTLOADER_MAGIC ),
"b" ( virt_to_phys ( &mbinfo ) ),
"D" ( image->entry )
: "ecx", "edx", "esi", "ebp" );
return -ECANCELED;
}