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efi: Add an EFI table address match function

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Add a function that will determine if a supplied physical address matches
the address of an EFI table.

Signed-off-by: Tom Lendacky <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Reviewed-by: Matt Fleming <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brijesh Singh <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Larry Woodman <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Radim Krčmář <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Toshimitsu Kani <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/e1e06441d80f44776df391e0e4cb485b345b7518.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Tom Lendacky 2017-07-17 16:10:13 -05:00 • committed by Ingo Molnar
commit a19d66c56a
2 changed files with 40 additions and 0 deletions
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33
drivers/firmware/efi/efi.c
View file

@ -55,6 +55,25 @@ struct efi __read_mostly efi = {
};
EXPORT_SYMBOL(efi);
static unsigned long *efi_tables[] = {
&efi.mps,
&efi.acpi,
&efi.acpi20,
&efi.smbios,
&efi.smbios3,
&efi.sal_systab,
&efi.boot_info,
&efi.hcdp,
&efi.uga,
&efi.uv_systab,
&efi.fw_vendor,
&efi.runtime,
&efi.config_table,
&efi.esrt,
&efi.properties_table,
&efi.mem_attr_table,
};
static bool disable_runtime;
static int __init setup_noefi(char *arg)
{
@ -855,6 +874,20 @@ int efi_status_to_err(efi_status_t status)
return err;
}
bool efi_is_table_address(unsigned long phys_addr)
{
unsigned int i;
if (phys_addr == EFI_INVALID_TABLE_ADDR)
return false;
for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
if (*(efi_tables[i]) == phys_addr)
return true;
return false;
}
#ifdef CONFIG_KEXEC
static int update_efi_random_seed(struct notifier_block *nb,
unsigned long code, void *unused)