1 files changed, 118 insertions, 70 deletions

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 0062a012504..1eb5f6433ad 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -1,39 +1,56 @@
 #ifndef _ASM_X86_EFI_H
 #define _ASM_X86_EFI_H
 
+#include <asm/i387.h>
+/*
+ * We map the EFI regions needed for runtime services non-contiguously,
+ * with preserved alignment on virtual addresses starting from -4G down
+ * for a total max space of 64G. This way, we provide for stable runtime
+ * services addresses across kernels so that a kexec'd kernel can still
+ * use them.
+ *
+ * This is the main reason why we're doing stable VA mappings for RT
+ * services.
+ *
+ * This flag is used in conjuction with a chicken bit called
+ * "efi=old_map" which can be used as a fallback to the old runtime
+ * services mapping method in case there's some b0rkage with a
+ * particular EFI implementation (haha, it is hard to hold up the
+ * sarcasm here...).
+ */
+#define EFI_OLD_MEMMAP		EFI_ARCH_1
+
+#define EFI32_LOADER_SIGNATURE	"EL32"
+#define EFI64_LOADER_SIGNATURE	"EL64"
+
 #ifdef CONFIG_X86_32
 
-#define EFI_LOADER_SIGNATURE	"EL32"
 
 extern unsigned long asmlinkage efi_call_phys(void *, ...);
 
-#define efi_call_phys0(f)		efi_call_phys(f)
-#define efi_call_phys1(f, a1)		efi_call_phys(f, a1)
-#define efi_call_phys2(f, a1, a2)	efi_call_phys(f, a1, a2)
-#define efi_call_phys3(f, a1, a2, a3)	efi_call_phys(f, a1, a2, a3)
-#define efi_call_phys4(f, a1, a2, a3, a4)	\
-	efi_call_phys(f, a1, a2, a3, a4)
-#define efi_call_phys5(f, a1, a2, a3, a4, a5)	\
-	efi_call_phys(f, a1, a2, a3, a4, a5)
-#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)	\
-	efi_call_phys(f, a1, a2, a3, a4, a5, a6)
 /*
  * 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)
-
-#define efi_call_virt0(f)		efi_call_virt(f)
-#define efi_call_virt1(f, a1)		efi_call_virt(f, a1)
-#define efi_call_virt2(f, a1, a2)	efi_call_virt(f, a1, a2)
-#define efi_call_virt3(f, a1, a2, a3)	efi_call_virt(f, a1, a2, a3)
-#define efi_call_virt4(f, a1, a2, a3, a4)	\
-	efi_call_virt(f, a1, a2, a3, a4)
-#define efi_call_virt5(f, a1, a2, a3, a4, a5)	\
-	efi_call_virt(f, a1, a2, a3, a4, a5)
-#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)	\
-	efi_call_virt(f, a1, a2, a3, a4, a5, a6)
+({									\
+	efi_status_t __s;						\
+	kernel_fpu_begin();						\
+	__s = ((efi_##f##_t __attribute__((regparm(0)))*)		\
+		efi.systab->runtime->f)(args);				\
+	kernel_fpu_end();						\
+	__s;								\
+})
+
+/* Use this macro if your virtual call does not return any value */
+#define __efi_call_virt(f, args...) \
+({									\
+	kernel_fpu_begin();						\
+	((efi_##f##_t __attribute__((regparm(0)))*)			\
+		efi.systab->runtime->f)(args);				\
+	kernel_fpu_end();						\
+})
 
 #define efi_ioremap(addr, size, type, attr)	ioremap_cache(addr, size)
 
@@ -41,52 +58,28 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...);
 
 #define EFI_LOADER_SIGNATURE	"EL64"
 
-extern u64 efi_call0(void *fp);
-extern u64 efi_call1(void *fp, u64 arg1);
-extern u64 efi_call2(void *fp, u64 arg1, u64 arg2);
-extern u64 efi_call3(void *fp, u64 arg1, u64 arg2, u64 arg3);
-extern u64 efi_call4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4);
-extern u64 efi_call5(void *fp, u64 arg1, u64 arg2, u64 arg3,
-		     u64 arg4, u64 arg5);
-extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
-		     u64 arg4, u64 arg5, u64 arg6);
-
-#define efi_call_phys0(f)			\
-	efi_call0((f))
-#define efi_call_phys1(f, a1)			\
-	efi_call1((f), (u64)(a1))
-#define efi_call_phys2(f, a1, a2)			\
-	efi_call2((f), (u64)(a1), (u64)(a2))
-#define efi_call_phys3(f, a1, a2, a3)				\
-	efi_call3((f), (u64)(a1), (u64)(a2), (u64)(a3))
-#define efi_call_phys4(f, a1, a2, a3, a4)				\
-	efi_call4((f), (u64)(a1), (u64)(a2), (u64)(a3),		\
-		  (u64)(a4))
-#define efi_call_phys5(f, a1, a2, a3, a4, a5)				\
-	efi_call5((f), (u64)(a1), (u64)(a2), (u64)(a3),		\
-		  (u64)(a4), (u64)(a5))
-#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)			\
-	efi_call6((f), (u64)(a1), (u64)(a2), (u64)(a3),		\
-		  (u64)(a4), (u64)(a5), (u64)(a6))
-
-#define efi_call_virt0(f)				\
-	efi_call0((efi.systab->runtime->f))
-#define efi_call_virt1(f, a1)					\
-	efi_call1((efi.systab->runtime->f), (u64)(a1))
-#define efi_call_virt2(f, a1, a2)					\
-	efi_call2((efi.systab->runtime->f), (u64)(a1), (u64)(a2))
-#define efi_call_virt3(f, a1, a2, a3)					\
-	efi_call3((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
-		  (u64)(a3))
-#define efi_call_virt4(f, a1, a2, a3, a4)				\
-	efi_call4((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
-		  (u64)(a3), (u64)(a4))
-#define efi_call_virt5(f, a1, a2, a3, a4, a5)				\
-	efi_call5((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
-		  (u64)(a3), (u64)(a4), (u64)(a5))
-#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6)			\
-	efi_call6((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
-		  (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
+extern u64 asmlinkage efi_call(void *fp, ...);
+
+#define efi_call_phys(f, args...)		efi_call((f), args)
+
+#define efi_call_virt(f, ...)						\
+({									\
+	efi_status_t __s;						\
+									\
+	efi_sync_low_kernel_mappings();					\
+	preempt_disable();						\
+	__kernel_fpu_begin();						\
+	__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);	\
+	__kernel_fpu_end();						\
+	preempt_enable();						\
+	__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);
@@ -94,13 +87,33 @@ extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
 #endif /* CONFIG_X86_32 */
 
 extern int add_efi_memmap;
-extern unsigned long x86_efi_facility;
+extern struct efi_scratch efi_scratch;
 extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
 extern int efi_memblock_x86_reserve_range(void);
 extern void efi_call_phys_prelog(void);
 extern void efi_call_phys_epilog(void);
 extern void efi_unmap_memmap(void);
 extern void efi_memory_uc(u64 addr, unsigned long size);
+extern void __init efi_map_region(efi_memory_desc_t *md);
+extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
+extern void efi_sync_low_kernel_mappings(void);
+extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
+extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
+extern void __init old_map_region(efi_memory_desc_t *md);
+extern void __init runtime_code_page_mkexec(void);
+extern void __init efi_runtime_mkexec(void);
+extern void __init efi_dump_pagetable(void);
+extern void __init efi_apply_memmap_quirks(void);
+
+struct efi_setup_data {
+	u64 fw_vendor;
+	u64 runtime;
+	u64 tables;
+	u64 smbios;
+	u64 reserved[8];
+};
+
+extern u64 efi_setup;
 
 #ifdef CONFIG_EFI
 
@@ -109,6 +122,40 @@ static inline bool efi_is_native(void)
 	return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
 }
 
+static inline bool efi_runtime_supported(void)
+{
+	if (efi_is_native())
+		return true;
+
+	if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
+		return true;
+
+	return false;
+}
+
+extern struct console early_efi_console;
+extern void parse_efi_setup(u64 phys_addr, u32 data_len);
+
+#ifdef CONFIG_EFI_MIXED
+extern void efi_thunk_runtime_setup(void);
+extern efi_status_t efi_thunk_set_virtual_address_map(
+	void *phys_set_virtual_address_map,
+	unsigned long memory_map_size,
+	unsigned long descriptor_size,
+	u32 descriptor_version,
+	efi_memory_desc_t *virtual_map);
+#else
+static inline void efi_thunk_runtime_setup(void) {}
+static inline efi_status_t efi_thunk_set_virtual_address_map(
+	void *phys_set_virtual_address_map,
+	unsigned long memory_map_size,
+	unsigned long descriptor_size,
+	u32 descriptor_version,
+	efi_memory_desc_t *virtual_map)
+{
+	return EFI_SUCCESS;
+}
+#endif /* CONFIG_EFI_MIXED */
 #else
 /*
  * IF EFI is not configured, have the EFI calls return -ENOSYS.
@@ -120,6 +167,7 @@ static inline bool efi_is_native(void)
 #define efi_call4(_f, _a1, _a2, _a3, _a4)		(-ENOSYS)
 #define efi_call5(_f, _a1, _a2, _a3, _a4, _a5)		(-ENOSYS)
 #define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6)	(-ENOSYS)
+static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
 #endif /* CONFIG_EFI */
 
 #endif /* _ASM_X86_EFI_H */