diff options
| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-03-08 11:08:43 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-03-08 11:58:17 +0300 |
| commit | 8acf63efa1712fa5495425a4224378bb3e1231e0 (patch) | |
| tree | 357541e3062049db304f4b612d01abc7cb44bddd /drivers/firmware | |
| parent | 3fab43318f0565ffb45925bea5903bc400ce2864 (diff) | |
| download | linux-8acf63efa1712fa5495425a4224378bb3e1231e0.tar.xz | |
efi/x86: Avoid using code32_start
code32_start is meant for 16-bit real-mode bootloaders to inform the
kernel where the 32-bit protected mode code starts. Nothing in the
protected mode kernel except the EFI stub uses it.
efi_main() currently returns boot_params, with code32_start set inside it
to tell efi_stub_entry() where startup_32 is located. Since it was invoked
by efi_stub_entry() in the first place, boot_params is already known.
Return the address of startup_32 instead.
This will allow a 64-bit kernel to live above 4Gb, for example, and it's
cleaner as well.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200301230436.2246909-5-nivedita@alum.mit.edu
Link: https://lore.kernel.org/r/20200308080859.21568-13-ardb@kernel.org
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/libstub/x86-stub.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c index 9db98839d7b4..7f3e97c2aad3 100644 --- a/drivers/firmware/efi/libstub/x86-stub.c +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -703,10 +703,11 @@ static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) } /* - * On success we return a pointer to a boot_params structure, and NULL - * on failure. + * On success, we return the address of startup_32, which has potentially been + * relocated by efi_relocate_kernel. + * On failure, we exit to the firmware via efi_exit instead of returning. */ -struct boot_params *efi_main(efi_handle_t handle, +unsigned long efi_main(efi_handle_t handle, efi_system_table_t *sys_table_arg, struct boot_params *boot_params) { @@ -736,7 +737,6 @@ struct boot_params *efi_main(efi_handle_t handle, goto fail; } } - hdr->code32_start = (u32)bzimage_addr; /* * efi_pe_entry() may have been called before efi_main(), in which @@ -799,7 +799,7 @@ struct boot_params *efi_main(efi_handle_t handle, goto fail; } - return boot_params; + return bzimage_addr; fail: efi_printk("efi_main() failed!\n"); |