acpi: Introduce acpi_arch_get_root_pointer() for getting rsdp address (dfc9327a) · Commits · 戴 / test

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>

drivers/acpi/osl.c

+4 −1

Original line number	Original line	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 __init acpi_os_get_root_pointer(void)
	{		{
	acpi_physical_address pa = 0;		acpi_physical_address pa;

	#ifdef CONFIG_KEXEC		#ifdef CONFIG_KEXEC
	if (acpi_rsdp)		if (acpi_rsdp)
	return acpi_rsdp;		return acpi_rsdp;
	#endif		#endif
			pa = acpi_arch_get_root_pointer();
			if (pa)
			return pa;

	if (efi_enabled(EFI_CONFIG_TABLES)) {		if (efi_enabled(EFI_CONFIG_TABLES)) {
	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)		if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)

include/linux/acpi.h

+7 −0

Original line number	Original line	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);		int acpi_arch_timer_mem_init(struct arch_timer_mem timer_mem, int timer_count);
	#endif		#endif

			#ifndef ACPI_HAVE_ARCH_GET_ROOT_POINTER
			static inline u64 acpi_arch_get_root_pointer(void)
			{
			return 0;
			}
			#endif

	#else /* !CONFIG_ACPI */		#else /* !CONFIG_ACPI */

	#define acpi_disabled 1		#define acpi_disabled 1

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