x86: EFI runtime service support

This patch adds basic runtime services support for EFI x86_64 system.  The
main file of the patch is the addition of efi_64.c for x86_64.  This file is
modeled after the EFI IA32 avatar.  EFI runtime services initialization are
implemented in efi_64.c.  Some x86_64 specifics are worth noting here.  On
x86_64, parameters passed to EFI firmware services need to follow the EFI
calling convention.  For this purpose, a set of functions named efi_call<x>
(<x> is the number of parameters) are implemented.  EFI function calls are
wrapped before calling the firmware service.  The duplicated code between
efi_32.c and efi_64.c is placed in efi.c to remove them from efi_32.c.

Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 76 insertions, 2 deletions

diff --git a/include/asm-x86/bootparam.h b/include/asm-x86/bootparam.h
index 19f3ddf2df4b..51151356840f 100644
--- a/include/asm-x86/bootparam.h
+++ b/include/asm-x86/bootparam.h
@@ -54,13 +54,14 @@ struct sys_desc_table {
 };
 
 struct efi_info {
-        __u32 _pad1;
+        __u32 efi_loader_signature;
         __u32 efi_systab;
         __u32 efi_memdesc_size;
         __u32 efi_memdesc_version;
         __u32 efi_memmap;
         __u32 efi_memmap_size;
-        __u32 _pad2[2];
+        __u32 efi_systab_hi;
+        __u32 efi_memmap_hi;
 };
 
 /* The so-called "zeropage" */
diff --git a/include/asm-x86/efi.h b/include/asm-x86/efi.h
new file mode 100644
index 000000000000..1459d3d58653
--- /dev/null
+++ b/include/asm-x86/efi.h
@@ -0,0 +1,70 @@
+#ifndef _ASM_X86_EFI_H
+#define _ASM_X86_EFI_H
+
+#ifdef CONFIG_X86_32
+#else /* !CONFIG_X86_32 */
+
+#define MAX_EFI_IO_PAGES        100
+
+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((void *)(f))
+#define efi_call_phys1(f, a1)                   \
+        efi_call1((void *)(f), (u64)(a1))
+#define efi_call_phys2(f, a1, a2)                       \
+        efi_call2((void *)(f), (u64)(a1), (u64)(a2))
+#define efi_call_phys3(f, a1, a2, a3)                           \
+        efi_call3((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3))
+#define efi_call_phys4(f, a1, a2, a3, a4)                               \
+        efi_call4((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3),         \
+                  (u64)(a4))
+#define efi_call_phys5(f, a1, a2, a3, a4, a5)                           \
+        efi_call5((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3),         \
+                  (u64)(a4), (u64)(a5))
+#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6)                       \
+        efi_call6((void *)(f), (u64)(a1), (u64)(a2), (u64)(a3),         \
+                  (u64)(a4), (u64)(a5), (u64)(a6))
+
+#define efi_call_virt0(f)                               \
+        efi_call0((void *)(efi.systab->runtime->f))
+#define efi_call_virt1(f, a1)                                   \
+        efi_call1((void *)(efi.systab->runtime->f), (u64)(a1))
+#define efi_call_virt2(f, a1, a2)                                       \
+        efi_call2((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2))
+#define efi_call_virt3(f, a1, a2, a3)                                   \
+        efi_call3((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+                  (u64)(a3))
+#define efi_call_virt4(f, a1, a2, a3, a4)                               \
+        efi_call4((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+                  (u64)(a3), (u64)(a4))
+#define efi_call_virt5(f, a1, a2, a3, a4, a5)                           \
+        efi_call5((void *)(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((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
+                  (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
+
+#define efi_early_ioremap(addr, size)           early_ioremap(addr, size)
+#define efi_early_iounmap(vaddr, size)          early_iounmap(vaddr, size)
+
+extern void *efi_ioremap(unsigned long offset, unsigned long size);
+
+extern int efi_time;
+
+#endif /* CONFIG_X86_32 */
+
+extern void efi_reserve_bootmem(void);
+extern void efi_call_phys_prelog(void);
+extern void efi_call_phys_epilog(void);
+extern void runtime_code_page_mkexec(void);
+
+#endif
diff --git a/include/asm-x86/fixmap_64.h b/include/asm-x86/fixmap_64.h
index cdfbe4a6ae6f..8f44782e5fe5 100644
--- a/include/asm-x86/fixmap_64.h
+++ b/include/asm-x86/fixmap_64.h
@@ -15,6 +15,7 @@
 #include <asm/apicdef.h>
 #include <asm/page.h>
 #include <asm/vsyscall.h>
+#include <asm/efi.h>
 
 /*
  * Here we define all the compile-time 'special' virtual
@@ -41,6 +42,8 @@ enum fixed_addresses {
         FIX_APIC_BASE,  /* local (CPU) APIC) -- required for SMP or not */
         FIX_IO_APIC_BASE_0,
         FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS-1,
+        FIX_EFI_IO_MAP_LAST_PAGE,
+        FIX_EFI_IO_MAP_FIRST_PAGE = FIX_EFI_IO_MAP_LAST_PAGE+MAX_EFI_IO_PAGES-1,
         __end_of_fixed_addresses
 };