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| author | Dave Young <dyoung@redhat.com> | 2014-08-14 17:15:28 +0800 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2014-10-03 18:40:59 +0100 |
| commit | 5ae3683c380e78aebc60d710617ba2c0dccc9e84 (patch) | |
| tree | 27bbb57319052f020bd06f11dcfdd1d61538bfab | |
| parent | 6ccc72b87b83ece31c2a75bbe07f440b0378f7a9 (diff) | |
| download | lwn-5ae3683c380e78aebc60d710617ba2c0dccc9e84.tar.gz lwn-5ae3683c380e78aebc60d710617ba2c0dccc9e84.zip | |
efi: Add kernel param efi=noruntime
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>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | arch/x86/platform/efi/efi.c | 4 | ||||
| -rw-r--r-- | drivers/firmware/efi/efi.c | 9 |
3 files changed, 13 insertions, 3 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 08df275eee2b..d0e431611a04 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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 diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index c73a7df5d37f..00f4cc566adb 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -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); diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index c8f01a73edb5..cebfa36a27ae 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -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; |