diff options
| author | Kairui Song <kasong@redhat.com> | 2019-05-24 14:23:19 +0800 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2019-05-31 11:26:04 +0200 |
| commit | cedeee0a30075030632a18e419419371ddf3fca3 (patch) | |
| tree | 7a3e4dcf3deb8aa1cc718d908912d945a39d211f /kexec/arch/i386/x86-linux-setup.h | |
| parent | 402351390f31b2db0768eef4ced375d00bff9e17 (diff) | |
x86: Introduce helpers for getting RSDP address
On x86 RSDP is fundamental for booting the machine. When second kernel
is incapable of parsing the RSDP address (eg. kexec next kernel on an EFI
system with EFI service disabled), kexec should prepare the RSDP address
for second kernel.
Introduce helpers for getting RSDP from multiple sources, including boot
params and EFI firmware.
For legacy BIOS interface, there is no better way to find the RSDP address
rather than scanning the memory region and search for it, and this will
always be done by the kernel as a fallback, so this is no need to try to
get the RSDP address for that case.
Signed-off-by: Kairui Song <kasong@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'kexec/arch/i386/x86-linux-setup.h')
| -rw-r--r-- | kexec/arch/i386/x86-linux-setup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kexec/arch/i386/x86-linux-setup.h b/kexec/arch/i386/x86-linux-setup.h index f5d23d3..0c651e5 100644 --- a/kexec/arch/i386/x86-linux-setup.h +++ b/kexec/arch/i386/x86-linux-setup.h @@ -21,6 +21,7 @@ static inline void setup_linux_bootloader_parameters( } void setup_linux_system_parameters(struct kexec_info *info, struct x86_linux_param_header *real_mode); +int get_bootparam(void *buf, off_t offset, size_t size); #define SETUP_BASE 0x90000 |