[PATCH V5 05/15] Add efi_arch_cfg_file_early/late() to handle arch specific cfg file fields

[Roy Franz <roy.franz@linaro.org>]

Different architectures have some different configuration file
fields that need to be handled.  In particular, x86 has ucode
and ARM has device tree files to be loaded.  These arch specific
functions is used to allow each architecture to implement these
features in arch specific code.  Early/late versions are provided,
as ARM needs to process the DTB entry first, and x86 wants to process
the ucode entry last as it is the smallest allocation.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
---
 xen/common/efi/boot.c          | 21 ++++++++++-----------
 xen/include/asm-x86/efi-boot.h | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index f4662b4..58e3cbc 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -54,6 +54,12 @@ static void  DisplayUint(UINT64 Val, INTN Width);
 static CHAR16 *wstrcpy(CHAR16 *d, const CHAR16 *s);
 static void noreturn blexit(const CHAR16 *str);
 static void PrintErrMesg(const CHAR16 *mesg, EFI_STATUS ErrCode);
+static char *get_value(const struct file *cfg, const char *section,
+                              const char *item);
+static void  split_value(char *s);
+static CHAR16 *s2w(union string *str);
+static bool_t  read_file(EFI_FILE_HANDLE dir_handle, CHAR16 *name,
+                               struct file *file);
 
 static EFI_BOOT_SERVICES *__initdata efi_bs;
 static EFI_HANDLE __initdata efi_ih;
@@ -843,6 +849,9 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
     }
     if ( !name.s )
         blexit(L"No Dom0 kernel image specified.");
+
+    efi_arch_cfg_file_early(dir_handle, section.s);
+
     split_value(name.s);
     read_file(dir_handle, s2w(&name), &kernel);
     efi_bs->FreePool(name.w);
@@ -860,17 +869,6 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
         efi_bs->FreePool(name.w);
     }
 
-    name.s = get_value(&cfg, section.s, "ucode");
-    if ( !name.s )
-        name.s = get_value(&cfg, "global", "ucode");
-    if ( name.s )
-    {
-        microcode_set_module(mbi.mods_count);
-        split_value(name.s);
-        read_file(dir_handle, s2w(&name), &ucode);
-        efi_bs->FreePool(name.w);
-    }
-
     name.s = get_value(&cfg, section.s, "xsm");
     if ( name.s )
     {
@@ -909,6 +907,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
                 cols = rows = depth = 0;
         }
     }
+    efi_arch_cfg_file_late(dir_handle, section.s);
 
     efi_bs->FreePages(cfg.addr, PFN_UP(cfg.size));
     cfg.addr = 0;
diff --git a/xen/include/asm-x86/efi-boot.h b/xen/include/asm-x86/efi-boot.h
index 7aba173..93498bb 100644
--- a/xen/include/asm-x86/efi-boot.h
+++ b/xen/include/asm-x86/efi-boot.h
@@ -259,3 +259,23 @@ static void __init noreturn efi_arch_post_exit_boot(void)
                    : "memory" );
     for( ; ; ); /* not reached */
 }
+
+static void __init efi_arch_cfg_file_early(EFI_FILE_HANDLE dir_handle, char *section)
+{
+}
+
+static void __init efi_arch_cfg_file_late(EFI_FILE_HANDLE dir_handle, char *section)
+{
+    union string name;
+
+    name.s = get_value(&cfg, section, "ucode");
+    if ( !name.s )
+        name.s = get_value(&cfg, "global", "ucode");
+    if ( name.s )
+    {
+        microcode_set_module(mbi.mods_count);
+        split_value(name.s);
+        read_file(dir_handle, s2w(&name), &ucode);
+        efi_bs->FreePool(name.w);
+    }
+}
-- 
2.1.0