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efi_loader: document efi_save_gd(), efi_restore_gd()

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Provide function descriptions for efi_save_gd() and efi_restore_gd().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-07-18 09:53:01 +02:00
parent 1ef1cf1f93
commit e7d64065cb
1 changed files with 15 additions and 5 deletions
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20
lib/efi_loader/efi_boottime.c
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@ -104,7 +104,15 @@ int __efi_exit_check(void)
return ret;
}
/* Called from do_bootefi_exec() */
/**
* efi_save_gd() - save global data register
*
* On the ARM architecture gd is mapped to a fixed register (r9 or x18).
* As this register may be overwritten by an EFI payload we save it here
* and restore it on every callback entered.
*
* This function is called after relocation from initr_reloc_global_data().
*/
void efi_save_gd(void)
{
#ifdef CONFIG_ARM
@ -112,10 +120,12 @@ void efi_save_gd(void)
#endif
}
/*
* Special case handler for error/abort that just forces things back to u-boot
* world so we can dump out an abort message, without any care about returning
* back to UEFI world.
/**
* efi_restore_gd() - restore global data register
*
* On the ARM architecture gd is mapped to a fixed register (r9 or x18).
* Restore it after returning from the UEFI world to the value saved via
* efi_save_gd().
*/
void efi_restore_gd(void)
{