This patch sync the behavior of user space kexec and kexec_file_load,
they will both fill the boot_params.acpi_rsdp_addr with a valid RSDP
value, to make sure second kernel can always get the RSDP consistently.
This will make it effortless to boot newer version of kernel (5.0+)
without specifying acpi_rsdp= cmdline on EFI system even with EFI
service disabled. Should not change any behavior with older kernels.
Update from V2:
- Drop unneeded 'packed' attribute for boot parameters structure
- Don't trust kernel cmdline as a reliable acpi rsdp source
Update from V1:
- Split into multiple patches for a cleaner structure, content is not
changed.
Kairui Song (4):
x86: Update boot parameters defination
x86: Introduce helpers for getting RSDP address
x86: Always try to fill acpi_rsdp_addr in boot params
crashdump/x86: Use new introduce helper for getting RSDP
include/x86/x86-linux.h | 6 +++--
kexec/arch/i386/crashdump-x86.c | 34 +++++++----------------
kexec/arch/i386/kexec-x86-common.c | 43 ++++++++++++++++++++++++++++++
kexec/arch/i386/kexec-x86.h | 1 +
kexec/arch/i386/x86-linux-setup.c | 6 +++--
kexec/arch/i386/x86-linux-setup.h | 1 +
6 files changed, 62 insertions(+), 29 deletions(-)
--
2.21.0
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