[PATCH v2] x86/boot: Use EFI setup data if provided
bp at alien8.de
Mon Mar 25 05:32:29 PDT 2019
On Mon, Mar 25, 2019 at 08:23:02PM +0800, Dave Young wrote:
> efi_enter_virtual_mode() can only run once because of efi firmware/spec
> limitation, and after entered virtual mode, efi firmware just updated
I should remember that - I did it at the time.
> Kexec saved the original physical addresses, and pass them to kexeced
> kernel via x86 setup_data, so both the early parsing or efi init code
> need to get those physical values from setup_data.
So efi_get_rsdp_addr() needs to be refactored in such a way so that at
least the loop towards the end gets carved out into a separate function
- __efi_get_rsdp_addr() or so - which gets config_tables, nr_tables and
size as arguments and finds the RSDP address in the kexec-ed kernel.
So we'd need something like that:
pa = get_acpi_rsdp();
pa = boot_params->acpi_rsdp_addr;
pa = efi_get_rsdp_addr();
pa = kexec_get_rdsp_addr(); <--- new function
pa = bios_get_rsdp_addr();
which would get config_tables from setup_data and call
__efi_get_rsdp_addr() to dig it out in the kexec'ed kernel.
Junichi, ask if it is still unclear what needs to be done.
Good mailing practices for 400: avoid top-posting and trim the reply.
More information about the kexec