50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
From: Steve McIntyre <steve@einval.com>
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Date: Fri, 9 Jan 2015 15:29:53 +0000
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Subject: efi: Expose underlying UEFI firmware platform size to userland
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Origin: https://git.kernel.org/cgit/linux/kernel/git/mfleming/efi.git//commit?id=2859dff97e54db4795b8b7d9606cb8efcec722ff
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In some cases (e.g. Intel Bay Trail machines), the kernel will happily
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run in 64-bit even if the underlying UEFI firmware platform is
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32-bit. That's great, but it's difficult for userland utilities like
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grub-install to do the right thing in such a situation.
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The kernel already knows about the size of the firmware via
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efi_enabled(EFI_64BIT). Add an extra sysfs interface
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/sys/firmware/efi/fw_platform_size to expose that information to
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userland for low-level utilities to use.
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Signed-off-by: Steve McIntyre <steve@einval.com>
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Cc: Matthew Garrett <mjg59@srcf.ucam.org>
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Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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---
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drivers/firmware/efi/efi.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/drivers/firmware/efi/efi.c
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+++ b/drivers/firmware/efi/efi.c
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@@ -90,15 +90,24 @@ EFI_ATTR_SHOW(fw_vendor);
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EFI_ATTR_SHOW(runtime);
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EFI_ATTR_SHOW(config_table);
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+static ssize_t fw_platform_size_show(struct kobject *kobj,
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+ struct kobj_attribute *attr, char *buf)
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+{
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+ return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
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+}
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+
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static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
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static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
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static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
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+static struct kobj_attribute efi_attr_fw_platform_size =
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+ __ATTR_RO(fw_platform_size);
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static struct attribute *efi_subsys_attrs[] = {
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&efi_attr_systab.attr,
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&efi_attr_fw_vendor.attr,
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&efi_attr_runtime.attr,
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&efi_attr_config_table.attr,
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+ &efi_attr_fw_platform_size.attr,
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NULL,
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};
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