Commit dfc9327a authored Feb 19, 2018 by Juergen Gross Committed by Ingo Molnar Feb 26, 2018

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 <jgross@suse.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
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 <mingo@kernel.org>

parent 3f7df3ef

drivers/acpi/osl.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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)

include/linux/acpi.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -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