Commit-ID: 982e239cd2c73d2c70e14615a42c0c7391415a44
Gitweb: http://git.kernel.org/tip/982e239cd2c73d2c70e14615a42c0c7391415a44
Author: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 27 Mar 2014 15:10:41 -0700
Committer: Matt Fleming <matt.fleming@xxxxxxxxx>
CommitDate: Thu, 17 Apr 2014 13:26:32 +0100
x86/efi: Implement a __efi_call_virt macro
For i386, all the EFI system runtime services functions return efi_status_t
except efi_reset_system_system. Therefore, not all functions can be covered
by the same macro in case the macro needs to do more than calling the function
(i.e., return a value). The purpose of the __efi_call_virt macro is to be used
when no return value is expected.
For x86_64, this macro would not be needed as all the runtime services return
u64. However, the same code is used for both x86_64 and i386. Thus, the macro
__efi_call_virt is also defined to not break compilation.
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
---
arch/x86/include/asm/efi.h | 10 ++++++++++
arch/x86/platform/efi/efi.c | 4 ++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index e397559..19292e7 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -31,9 +31,13 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...);
* Wrap all the virtual calls in a way that forces the parameters on the stack.
*/
+/* Use this macro if your virtual returns a non-void value */
#define efi_call_virt(f, args...) \
((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args)
+/* Use this macro if your virtual call does not return any value */
+#define __efi_call_virt(f, args...) efi_call_virt(f, args)
+
#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
#else /* !CONFIG_X86_32 */
@@ -55,6 +59,12 @@ extern u64 asmlinkage efi_call(void *fp, ...);
__s; \
})
+/*
+ * All X86_64 virt calls return non-void values. Thus, use non-void call for
+ * virt calls that would be void on X86_32.
+ */
+#define __efi_call_virt(f, args...) efi_call_virt(f, args)
+
extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
u32 type, u64 attribute);
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 8f6531e..835b248 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -202,8 +202,8 @@ static void virt_efi_reset_system(int reset_type,
unsigned long data_size,
efi_char16_t *data)
{
- efi_call_virt(reset_system, reset_type, status,
- data_size, data);
+ __efi_call_virt(reset_system, reset_type, status,
+ data_size, data);
}
static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
--
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