From dfc9327ab7c99bc13e12106448615efba833886b Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Mon, 19 Feb 2018 11:09:04 +0100 Subject: acpi: Introduce acpi_arch_get_root_pointer() for getting rsdp address Add an architecture specific function to get the address of the RSDP table. Per default it will just return 0 indicating falling back to the current mechanism. Signed-off-by: Juergen Gross Reviewed-by: Andy Shevchenko Acked-by: Thomas Gleixner Acked-by: Rafael J. Wysocki Cc: Borislav Petkov Cc: Eric Biederman Cc: H. Peter Anvin Cc: Kees Cook Cc: Kirill A. Shutemov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: boris.ostrovsky@oracle.com Cc: lenb@kernel.org Cc: linux-acpi@vger.kernel.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20180219100906.14265-2-jgross@suse.com Signed-off-by: Ingo Molnar --- drivers/acpi/osl.c | 5 ++++- include/linux/acpi.h | 7 +++++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 3bb46cb24a99..7ca41bf023c9 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -189,12 +189,15 @@ early_param("acpi_rsdp", setup_acpi_rsdp); acpi_physical_address __init acpi_os_get_root_pointer(void) { - acpi_physical_address pa = 0; + acpi_physical_address pa; #ifdef CONFIG_KEXEC if (acpi_rsdp) return acpi_rsdp; #endif + pa = acpi_arch_get_root_pointer(); + if (pa) + return pa; if (efi_enabled(EFI_CONFIG_TABLES)) { if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 968173ec2726..15bfb15c2fa5 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -623,6 +623,13 @@ bool acpi_gtdt_c3stop(int type); int acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, int *timer_count); #endif +#ifndef ACPI_HAVE_ARCH_GET_ROOT_POINTER +static inline u64 acpi_arch_get_root_pointer(void) +{ + return 0; +} +#endif + #else /* !CONFIG_ACPI */ #define acpi_disabled 1 -- cgit v1.2.3