diff options
Diffstat (limited to 'arch/x86/kernel/setup.c')
| -rw-r--r-- | arch/x86/kernel/setup.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 90ecc108bc8a..7005f89bf3b2 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1281,6 +1281,23 @@ void __init setup_arch(char **cmdline_p) unwind_init(); } +/* + * From boot protocol 2.14 onwards we expect the bootloader to set the + * version to "0x8000 | <used version>". In case we find a version >= 2.14 + * without the 0x8000 we assume the boot loader supports 2.13 only and + * reset the version accordingly. The 0x8000 flag is removed in any case. + */ +void __init x86_verify_bootdata_version(void) +{ + if (boot_params.hdr.version & VERSION_WRITTEN) + boot_params.hdr.version &= ~VERSION_WRITTEN; + else if (boot_params.hdr.version >= 0x020e) + boot_params.hdr.version = 0x020d; + + if (boot_params.hdr.version < 0x020e) + boot_params.hdr.acpi_rsdp_addr = 0; +} + #ifdef CONFIG_X86_32 static struct resource video_ram_resource = { |