Skip to contentSkip to conversation

loader relocation

RFC New Robert Millan 1 participant 1 message Jan 24, 2008

lore
Share & tools
lore

Robert Millan

author
#0 lore raw

RFC 1/1 loader relocation

As discussed on two other threads, this patch is a proof of concept of relocation in the loader.

Some comments:

- grub_protected_malloc() is like malloc, but with the garantee that it won't overlap with a particular region. Do you think this is the right approach? Should this be kept as a layer on top of the memory manager, like now, or rather be integrated with it to take advantage of its internal knowledge? I find that the current implementation is an ugly hack...

- This works for multiboot only. How far can we go at making it more generic? At least the malloc part should be; not sure about the rest.

- The phdr(i) hack can be committed separately in case we decide that it is necessary for this feature (or just convenient for readability). It's described at:

http://www.mail-archive.com/[email protected]/msg03517.html

Signature · 5 lines
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call… if you are unable to speak?
(as seen on /.)
include/grub/i386/loader.h +10 -0
diff -ur grub2/include/grub/i386/loader.h grub2.self/include/grub/i386/loader.h
@@ -29,13 +29,23 @@
 extern grub_addr_t EXPORT_VAR(grub_os_area_addr);
 extern grub_size_t EXPORT_VAR(grub_os_area_size);
 
+extern grub_addr_t EXPORT_VAR(playground);
+extern grub_addr_t EXPORT_VAR(requested_addr);
+extern int EXPORT_VAR(playground_size);
+
 void EXPORT_FUNC(grub_linux_boot_zimage) (void) __attribute__ ((noreturn));
 void EXPORT_FUNC(grub_linux_boot_bzimage) (void) __attribute__ ((noreturn));
 
 /* The asm part of the multiboot loader.  */
+void EXPORT_FUNC(grub_multiboot_real_boot_1st) (grub_addr_t entry, 
+					    struct grub_multiboot_info *mbi,
+					    void *next)
+     __attribute__ ((noreturn));
 void EXPORT_FUNC(grub_multiboot_real_boot) (grub_addr_t entry, 
 					    struct grub_multiboot_info *mbi) 
      __attribute__ ((noreturn));
+extern int EXPORT_VAR(end_of_grub_multiboot_real_boot);
+
 void EXPORT_FUNC(grub_multiboot2_real_boot) (grub_addr_t entry,
                                              struct grub_multiboot_info *mbi)
      __attribute__ ((noreturn));
kern/i386/pc/startup.S +41 -5

64 lines not on this page · raw message

loader/i386/pc/multiboot.c +61 -21

141 lines not on this page · raw message