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efi: Add kernel param efi=noruntime

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noefi kernel param means actually disabling efi runtime, Per suggestion
from Leif Lindholm efi=noruntime should be better. But since noefi is
already used in X86 thus just adding another param efi=noruntime for
same purpose.

Signed-off-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Dave Young 2014-08-14 17:15:28 +08:00 committed by Matt Fleming
parent 6ccc72b87b
commit 5ae3683c38
3 changed files with 13 additions and 3 deletions
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3
Documentation/kernel-parameters.txt
View File

@ -992,13 +992,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: {"off" | "on" | "skip[mbr]"}
efi= [EFI]
Format: { "old_map", "nochunk" }
Format: { "old_map", "nochunk", "noruntime" }
old_map [X86-64]: switch to the old ioremap-based EFI
runtime services mapping. 32-bit still uses this one by
default.
nochunk: disable reading files in "chunks" in the EFI
boot stub, as chunking can cause problems with some
firmware implementations.
noruntime : disable EFI runtime services support
efi_no_storage_paranoia [EFI; X86]
Using this parameter you can use more than 50% of

4
arch/x86/platform/efi/efi.c
View File

@ -930,11 +930,11 @@ u64 efi_mem_attributes(unsigned long phys_addr)
return 0;
}
static int __init parse_efi_cmdline(char *str)
static int __init arch_parse_efi_cmdline(char *str)
{
if (parse_option_str(str, "old_map"))
set_bit(EFI_OLD_MEMMAP, &efi.flags);
return 0;
}
early_param("efi", parse_efi_cmdline);
early_param("efi", arch_parse_efi_cmdline);

9
drivers/firmware/efi/efi.c
View File

@ -54,6 +54,15 @@ bool efi_runtime_disabled(void)
return disable_runtime;
}
static int __init parse_efi_cmdline(char *str)
{
if (parse_option_str(str, "noruntime"))
disable_runtime = true;
return 0;
}
early_param("efi", parse_efi_cmdline);
static struct kobject *efi_kobj;
static struct kobject *efivars_kobj;