Commit-ID: 0c89cf36424f7c1177de8a5712514d7cc2eb369f
Gitweb: https://git.kernel.org/tip/0c89cf36424f7c1177de8a5712514d7cc2eb369f
Author: Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Fri, 8 Dec 2017 16:11:37 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 11 Dec 2017 15:14:20 +0100
x86/acpi: Take the RSDP address for boot parameters if available
In case the rsdp address in struct boot_params is specified don't try
to find the table by searching, but take the address directly as set
by the boot loader.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: corbet@xxxxxxx
Cc: lenb@xxxxxxxxxx
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: rjw@xxxxxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20171208151139.30213-3-jgross@xxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/acpi/boot.c | 7 +++++++
drivers/acpi/osl.c | 10 +++++++++-
include/linux/acpi.h | 2 ++
3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index f4c463d..26fc897 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -47,6 +47,7 @@
#include <asm/mpspec.h>
#include <asm/smp.h>
#include <asm/i8259.h>
+#include <asm/setup.h>
#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
static int __initdata acpi_force = 0;
@@ -1758,3 +1759,9 @@ void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
e820__range_add(addr, size, E820_TYPE_ACPI);
e820__update_table_print();
}
+
+acpi_physical_address acpi_arch_get_root_pointer(void)
+{
+ return boot_params.hdr.acpi_rsdp_addr;
+}
+EXPORT_SYMBOL_GPL(acpi_arch_get_root_pointer);
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3bb46cb..2b77db9 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -178,6 +178,11 @@ void acpi_os_vprintf(const char *fmt, va_list args)
#endif
}
+__weak acpi_physical_address acpi_arch_get_root_pointer(void)
+{
+ return 0;
+}
+
#ifdef CONFIG_KEXEC
static unsigned long acpi_rsdp;
static int __init setup_acpi_rsdp(char *arg)
@@ -189,12 +194,15 @@ 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 dc1ebfe..aa603cc 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1266,4 +1266,6 @@ static inline int lpit_read_residency_count_address(u64 *address)
}
#endif
+acpi_physical_address acpi_arch_get_root_pointer(void);
+
#endif /*_LINUX_ACPI_H*/
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|