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2008-08-02 Robert Millan <rmh@aybabtu.com>

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* loader/i386/pc/multiboot.c (playground, forward_relocator)
        (backward_relocator): New variables.  Used to allocate and relocate
        the payload, respectively.
        (grub_multiboot_load_elf32): Load into heap instead of requested
        address, install the appropiate relocator code in each bound of
        the payload, and set the entry point such that
        grub_multiboot_real_boot() will jump to one of them.

        * kern/i386/loader.S (grub_multiboot_payload_size)
        (grub_multiboot_payload_orig, grub_multiboot_payload_dest)
        (grub_multiboot_payload_entry_offset): New variables.
        (grub_multiboot_real_boot): Set cpu context to what the relocator
        expects, and jump to the relocator instead of the payload.

        * include/grub/i386/loader.h (grub_multiboot_payload_size)
        (grub_multiboot_payload_orig, grub_multiboot_payload_dest)
        (grub_multiboot_payload_entry_offset): Export.
This commit is contained in:
robertmh 2008-08-02 12:12:14 +00:00
parent b15d8a0cc6
commit a927cc7383
4 changed files with 104 additions and 26 deletions
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4
include/grub/i386/loader.h
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@ -43,6 +43,10 @@ void EXPORT_FUNC(grub_multiboot2_real_boot) (grub_addr_t entry,
void EXPORT_FUNC(grub_unix_real_boot) (grub_addr_t entry, ...)
__attribute__ ((cdecl,noreturn));
extern grub_addr_t EXPORT_VAR(grub_multiboot_payload_orig);
extern grub_addr_t EXPORT_VAR(grub_multiboot_payload_dest);
extern grub_size_t EXPORT_VAR(grub_multiboot_payload_size);
extern grub_uint32_t EXPORT_VAR(grub_multiboot_payload_entry_offset);
/* It is necessary to export these functions, because normal mode commands
reuse rescue mode commands. */