efi: Convert efi_call_virt() to efi_call_virt_pointer()
This commit makes a few slight modifications to the efi_call_virt() macro to get it to work with function pointers that are stored in locations other than efi.systab->runtime, and renames the macro to efi_call_virt_pointer(). The majority of the changes here are to pull these macros up into header files so that they can be accessed from outside of drivers/firmware/efi/runtime-wrappers.c. The most significant change not directly related to the code move is to add an extra "p" argument into the appropriate efi_call macros, and use that new argument in place of the, formerly hard-coded, efi.systab->runtime pointer. The last piece of the puzzle was to add an efi_call_virt() macro back into drivers/firmware/efi/runtime-wrappers.c to wrap around the new efi_call_virt_pointer() macro - this was mainly to keep the code from looking too cluttered by adding a bunch of extra references to efi.systab->runtime everywhere. Note that I also broke up the code in the efi_call_virt_pointer() macro a bit in the process of moving it. Signed-off-by: Alex Thorlton <athorlton@sgi.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dimitri Sivanich <sivanich@sgi.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Roy Franz <roy.franz@linaro.org> Cc: Russ Anderson <rja@sgi.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1466839230-12781-5-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -28,10 +28,10 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
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#define arch_efi_call_virt_setup() efi_virtmap_load()
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#define arch_efi_call_virt_teardown() efi_virtmap_unload()
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#define arch_efi_call_virt(f, args...) \
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#define arch_efi_call_virt(p, f, args...) \
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({ \
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efi_##f##_t *__f; \
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__f = efi.systab->runtime->f; \
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__f = p->f; \
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__f(args); \
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})
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@ -23,10 +23,10 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
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efi_virtmap_load(); \
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})
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#define arch_efi_call_virt(f, args...) \
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#define arch_efi_call_virt(p, f, args...) \
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({ \
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efi_##f##_t *__f; \
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__f = efi.systab->runtime->f; \
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__f = p->f; \
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__f(args); \
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})
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@ -41,10 +41,9 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...);
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/*
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* Wrap all the virtual calls in a way that forces the parameters on the stack.
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*/
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#define arch_efi_call_virt(f, args...) \
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#define arch_efi_call_virt(p, f, args...) \
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({ \
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((efi_##f##_t __attribute__((regparm(0)))*) \
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efi.systab->runtime->f)(args); \
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((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \
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})
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#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
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@ -81,8 +80,8 @@ struct efi_scratch {
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} \
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})
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#define arch_efi_call_virt(f, args...) \
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efi_call((void *)efi.systab->runtime->f, args) \
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#define arch_efi_call_virt(p, f, args...) \
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efi_call((void *)p->f, args) \
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#define arch_efi_call_virt_teardown() \
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({ \
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@ -22,7 +22,16 @@
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#include <linux/stringify.h>
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#include <asm/efi.h>
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static void efi_call_virt_check_flags(unsigned long flags, const char *call)
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/*
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* Wrap around the new efi_call_virt_generic() macros so that the
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* code doesn't get too cluttered:
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*/
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#define efi_call_virt(f, args...) \
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efi_call_virt_pointer(efi.systab->runtime, f, args)
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#define __efi_call_virt(f, args...) \
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__efi_call_virt_pointer(efi.systab->runtime, f, args)
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void efi_call_virt_check_flags(unsigned long flags, const char *call)
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{
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unsigned long cur_flags, mismatch;
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@ -38,48 +47,6 @@ static void efi_call_virt_check_flags(unsigned long flags, const char *call)
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local_irq_restore(flags);
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}
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/*
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* Arch code can implement the following three template macros, avoiding
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* reptition for the void/non-void return cases of {__,}efi_call_virt:
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*
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* * arch_efi_call_virt_setup
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*
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* Sets up the environment for the call (e.g. switching page tables,
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* allowing kernel-mode use of floating point, if required).
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*
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* * arch_efi_call_virt
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*
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* Performs the call. The last expression in the macro must be the call
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* itself, allowing the logic to be shared by the void and non-void
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* cases.
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*
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* * arch_efi_call_virt_teardown
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*
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* Restores the usual kernel environment once the call has returned.
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*/
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#define efi_call_virt(f, args...) \
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({ \
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efi_status_t __s; \
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unsigned long flags; \
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arch_efi_call_virt_setup(); \
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local_save_flags(flags); \
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__s = arch_efi_call_virt(f, args); \
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efi_call_virt_check_flags(flags, __stringify(f)); \
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arch_efi_call_virt_teardown(); \
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__s; \
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})
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#define __efi_call_virt(f, args...) \
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({ \
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unsigned long flags; \
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arch_efi_call_virt_setup(); \
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local_save_flags(flags); \
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arch_efi_call_virt(f, args); \
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efi_call_virt_check_flags(flags, __stringify(f)); \
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arch_efi_call_virt_teardown(); \
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})
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/*
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* According to section 7.1 of the UEFI spec, Runtime Services are not fully
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* reentrant, and there are particular combinations of calls that need to be
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@ -1480,4 +1480,55 @@ efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
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unsigned long size);
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bool efi_runtime_disabled(void);
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extern void efi_call_virt_check_flags(unsigned long flags, const char *call);
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/*
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* Arch code can implement the following three template macros, avoiding
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* reptition for the void/non-void return cases of {__,}efi_call_virt():
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*
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* * arch_efi_call_virt_setup()
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*
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* Sets up the environment for the call (e.g. switching page tables,
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* allowing kernel-mode use of floating point, if required).
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*
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* * arch_efi_call_virt()
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*
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* Performs the call. The last expression in the macro must be the call
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* itself, allowing the logic to be shared by the void and non-void
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* cases.
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*
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* * arch_efi_call_virt_teardown()
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*
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* Restores the usual kernel environment once the call has returned.
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*/
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#define efi_call_virt_pointer(p, f, args...) \
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({ \
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efi_status_t __s; \
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unsigned long __flags; \
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\
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arch_efi_call_virt_setup(); \
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\
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local_save_flags(__flags); \
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__s = arch_efi_call_virt(p, f, args); \
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efi_call_virt_check_flags(__flags, __stringify(f)); \
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\
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arch_efi_call_virt_teardown(); \
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\
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__s; \
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})
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#define __efi_call_virt_pointer(p, f, args...) \
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({ \
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unsigned long __flags; \
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\
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arch_efi_call_virt_setup(); \
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\
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local_save_flags(__flags); \
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arch_efi_call_virt(p, f, args); \
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efi_call_virt_check_flags(__flags, __stringify(f)); \
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\
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arch_efi_call_virt_teardown(); \
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})
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#endif /* _LINUX_EFI_H */
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