sysadmin/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe synced 2025-12-30 04:28:12 +03:00
Code Issues Packages Projects Releases Wiki Activity

[prefix] Allow prefix to specify an arbitrary maximum address for relocation

Browse Source 
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2011-11-11 23:20:28 +00:00
parent 6c5f1a342b
commit 24226472b2
5 changed files with 33 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
src/arch/i386/core/relocate.c
View File

@@ -42,7 +42,7 @@ extern char _etextdata[];
*/
__asmcall void relocate ( struct i386_all_regs *ix86 ) {
struct memory_map memmap;
unsigned long start, end, size, padded_size;
unsigned long start, end, size, padded_size, max;
unsigned long new_start, new_end;
unsigned i;
@@ -57,6 +57,13 @@ __asmcall void relocate ( struct i386_all_regs *ix86 ) {
"...need %lx bytes for %d-byte alignment\n",
start, end, padded_size, max_align );
/* Determine maximum usable address */
max = MAX_ADDR;
if ( ix86->regs.ebp && ( ix86->regs.ebp < max ) ) {
max = ix86->regs.ebp;
DBG ( "Limiting relocation to [0,%lx)\n", max );
}
/* Walk through the memory map and find the highest address
* below 4GB that iPXE will fit into.
*/
@@ -67,18 +74,18 @@ __asmcall void relocate ( struct i386_all_regs *ix86 ) {
DBG ( "Considering [%llx,%llx)\n", region->start, region->end);
/* Truncate block to MAX_ADDR. This will be less than
* 4GB, which means that we can get away with using
* just 32-bit arithmetic after this stage.
/* Truncate block to maximum address. This will be
* less than 4GB, which means that we can get away
* with using just 32-bit arithmetic after this stage.
*/
if ( region->start > MAX_ADDR ) {
DBG ( "...starts after MAX_ADDR=%lx\n", MAX_ADDR );
if ( region->start > max ) {
DBG ( "...starts after max=%lx\n", max );
continue;
}
r_start = region->start;
if ( region->end > MAX_ADDR ) {
DBG ( "...end truncated to MAX_ADDR=%lx\n", MAX_ADDR );
r_end = MAX_ADDR;
if ( region->end > max ) {
DBG ( "...end truncated to max=%lx\n", max );
r_end = max;
} else {
r_end = region->end;
}