From 8c53b318b222eff55d2900b554094a099b1a30f6 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Tue, 26 Nov 2019 08:54:16 -0800 Subject: ACPI/sleep: Convert acpi_wakeup_address into a function Convert acpi_wakeup_address from a raw variable into a function so that x86 can wrap its dereference of the real mode boot header in a function instead of broadcasting it to the world via a #define. This sets the stage for a future patch to move x86's definition of the new function, acpi_get_wakeup_address(), out of asm/acpi.h and thus break acpi.h's dependency on asm/realmode.h. No functional change intended. Signed-off-by: Sean Christopherson Link: https://lkml.kernel.org/r/20191126165417.22423-12-sean.j.christopherson@intel.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/acpi.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/x86/include') diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index bc9693c9107e..23ffafd927a1 100644 --- a/arch/x86/include/asm/acpi.h +++ b/arch/x86/include/asm/acpi.h @@ -62,7 +62,10 @@ static inline void acpi_disable_pci(void) extern int (*acpi_suspend_lowlevel)(void); /* Physical address to resume after wakeup */ -#define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start)) +static inline unsigned long acpi_get_wakeup_address(void) +{ + return ((unsigned long)(real_mode_header->wakeup_start)); +} /* * Check if the CPU can handle C2 and deeper -- cgit v1.2.3 From 960786422fe90a86e81131f5dbd902cb5ebf8760 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Tue, 26 Nov 2019 08:54:17 -0800 Subject: x86/ACPI/sleep: Move acpi_get_wakeup_address() into sleep.c, remove from Move the definition of acpi_get_wakeup_address() into sleep.c to break linux/acpi.h's dependency (by way of asm/acpi.h) on asm/realmode.h. Everyone and their mother includes linux/acpi.h, i.e. modifying realmode.h results in a full kernel rebuild, which makes the already inscrutable real mode boot code even more difficult to understand and is positively rage inducing when trying to make changes to x86's boot flow. No functional change intended. Signed-off-by: Sean Christopherson Link: https://lkml.kernel.org/r/20191126165417.22423-13-sean.j.christopherson@intel.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/acpi.h | 6 +----- arch/x86/kernel/acpi/sleep.c | 11 +++++++++++ 2 files changed, 12 insertions(+), 5 deletions(-) (limited to 'arch/x86/include') diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index 23ffafd927a1..ca0976456a6b 100644 --- a/arch/x86/include/asm/acpi.h +++ b/arch/x86/include/asm/acpi.h @@ -13,7 +13,6 @@ #include #include #include -#include #include #ifdef CONFIG_ACPI_APEI @@ -62,10 +61,7 @@ static inline void acpi_disable_pci(void) extern int (*acpi_suspend_lowlevel)(void); /* Physical address to resume after wakeup */ -static inline unsigned long acpi_get_wakeup_address(void) -{ - return ((unsigned long)(real_mode_header->wakeup_start)); -} +unsigned long acpi_get_wakeup_address(void); /* * Check if the CPU can handle C2 and deeper diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c index ca13851f0570..26b7256f590f 100644 --- a/arch/x86/kernel/acpi/sleep.c +++ b/arch/x86/kernel/acpi/sleep.c @@ -26,6 +26,17 @@ unsigned long acpi_realmode_flags; static char temp_stack[4096]; #endif +/** + * acpi_get_wakeup_address - provide physical address for S3 wakeup + * + * Returns the physical address where the kernel should be resumed after the + * system awakes from S3, e.g. for programming into the firmware waking vector. + */ +unsigned long acpi_get_wakeup_address(void) +{ + return ((unsigned long)(real_mode_header->wakeup_start)); +} + /** * x86_acpi_enter_sleep_state - enter sleep state * @state: Sleep state to enter. -- cgit v1.2.3