diff options
| author | Michael Roth <michael.roth@amd.com> | 2022-02-24 10:56:05 -0600 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-04-06 17:07:09 +0200 |
| commit | 58f3e6b71f42f99ab5d0ab26ddf6e7ee5631f5db (patch) | |
| tree | ac6b1e0154d6c952d678c23920ac930385baa812 /arch/x86/boot/compressed/efi.c | |
| parent | 7c4146e8885512719a50b641e9277a1712e052ff (diff) | |
x86/compressed/acpi: Move EFI system table lookup to helper
Future patches for SEV-SNP-validated CPUID will also require early
parsing of the EFI configuration. Incrementally move the related
code into a set of helpers that can be re-used for that purpose.
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220307213356.2797205-26-brijesh.singh@amd.com
Diffstat (limited to 'arch/x86/boot/compressed/efi.c')
| -rw-r--r-- | arch/x86/boot/compressed/efi.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/efi.c b/arch/x86/boot/compressed/efi.c index bad0ce3e2ef6..72a81ba1f87b 100644 --- a/arch/x86/boot/compressed/efi.c +++ b/arch/x86/boot/compressed/efi.c @@ -48,3 +48,32 @@ enum efi_type efi_get_type(struct boot_params *bp) return et; } + +/** + * efi_get_system_table - Given a pointer to boot_params, retrieve the physical address + * of the EFI system table. + * + * @bp: pointer to boot_params + * + * Return: EFI system table address on success. On error, return 0. + */ +unsigned long efi_get_system_table(struct boot_params *bp) +{ + unsigned long sys_tbl_pa; + struct efi_info *ei; + enum efi_type et; + + /* Get systab from boot params. */ + ei = &bp->efi_info; +#ifdef CONFIG_X86_64 + sys_tbl_pa = ei->efi_systab | ((__u64)ei->efi_systab_hi << 32); +#else + sys_tbl_pa = ei->efi_systab; +#endif + if (!sys_tbl_pa) { + debug_putstr("EFI system table not found."); + return 0; + } + + return sys_tbl_pa; +} |