From 1758817e7ea822b1a7d1b95f0c35dd80d120805b Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 30 Jan 2023 19:50:55 +0100 Subject: [PATCH] efi: Use standard format for printing the EFI revision The UEFI spec section 4.2.1 describes the way the human readable EFI revision should be constructed from the 32-bit revision field in the system table: The upper 16 bits of this field contain the major revision value, and the lower 16 bits contain the minor revision value. The minor revision values are binary coded decimals and are limited to the range of 00..99. When printed or displayed UEFI spec revision is referred as (Major revision).(Minor revision upper decimal).(Minor revision lower decimal) or (Major revision).(Minor revision upper decimal) in case Minor revision lower decimal is set to 0. Let's adhere to this when logging the EFI revision to the kernel log. Note that the bit about binary coded decimals is bogus, and the minor revision lower decimal is simply the minor revision modulo 10, given the symbolic definitions provided by the spec itself: #define EFI_2_40_SYSTEM_TABLE_REVISION ((2<<16) | (40)) #define EFI_2_31_SYSTEM_TABLE_REVISION ((2<<16) | (31)) #define EFI_2_30_SYSTEM_TABLE_REVISION ((2<<16) | (30)) Signed-off-by: Ard Biesheuvel --- drivers/firmware/efi/efi.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 53fa4d1..4bb3043 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -796,6 +796,7 @@ void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr, char vendor[100] = "unknown"; const efi_char16_t *c16; size_t i; + u16 rev; c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t)); if (c16) { @@ -806,10 +807,14 @@ void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr, unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t)); } - pr_info("EFI v%u.%.02u by %s\n", - systab_hdr->revision >> 16, - systab_hdr->revision & 0xffff, - vendor); + rev = (u16)systab_hdr->revision; + pr_info("EFI v%u.%u", systab_hdr->revision >> 16, rev / 10); + + rev %= 10; + if (rev) + pr_cont(".%u", rev); + + pr_cont(" by %s\n", vendor); if (IS_ENABLED(CONFIG_X86_64) && systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION && -- 2.7.4