[PATCH v3 1/3] acpi: introduce acpi_arch_get_root_pointer() for getting rsdp address
From: Juergen Gross <jgross@suse.com>
Date: 2018-02-19 10:16:38
Also in:
lkml, stable, xen-devel
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
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. Cc: <redacted> # 4.11 Signed-off-by: Juergen Gross <jgross@suse.com> --- 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..ff812243bac3 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
--
2.13.6
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