[Xen-devel] [PATCH v2 16/23] efi: split out efi_variables()

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

..which collects variable store parameters. We want to re-use this
code to support multiboot2 protocol on EFI platforms.

Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
v2 - suggestions/fixes:
   - improve commit message
     (suggested by Jan Beulich).
---
 xen/common/efi/boot.c |   41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index fd62125..177697a 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -837,6 +837,29 @@ static void __init setup_efi_pci(void)
     efi_bs->FreePool(handles);
 }
 
+static void __init efi_variables(void)
+{
+    EFI_STATUS status;
+
+    status = (efi_rs->Hdr.Revision >> 16) >= 2 ?
+             efi_rs->QueryVariableInfo(EFI_VARIABLE_NON_VOLATILE |
+                                       EFI_VARIABLE_BOOTSERVICE_ACCESS |
+                                       EFI_VARIABLE_RUNTIME_ACCESS,
+                                       &efi_boot_max_var_store_size,
+                                       &efi_boot_remain_var_store_size,
+                                       &efi_boot_max_var_size) :
+             EFI_INCOMPATIBLE_VERSION;
+    if ( EFI_ERROR(status) )
+    {
+        efi_boot_max_var_store_size = 0;
+        efi_boot_remain_var_store_size = 0;
+        efi_boot_max_var_size = status;
+        PrintStr(L"Warning: Could not query variable store: ");
+        DisplayUint(status, 0);
+        PrintStr(newline);
+    }
+}
+
 static int __init __maybe_unused set_color(u32 mask, int bpp, u8 *pos, u8 *sz)
 {
    if ( bpp < 0 )
@@ -1078,23 +1101,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
*SystemTable)
     setup_efi_pci();
 
     /* Get snapshot of variable store parameters. */
-    status = (efi_rs->Hdr.Revision >> 16) >= 2 ?
-             efi_rs->QueryVariableInfo(EFI_VARIABLE_NON_VOLATILE |
-                                       EFI_VARIABLE_BOOTSERVICE_ACCESS |
-                                       EFI_VARIABLE_RUNTIME_ACCESS,
-                                       &efi_boot_max_var_store_size,
-                                       &efi_boot_remain_var_store_size,
-                                       &efi_boot_max_var_size) :
-             EFI_INCOMPATIBLE_VERSION;
-    if ( EFI_ERROR(status) )
-    {
-        efi_boot_max_var_store_size = 0;
-        efi_boot_remain_var_store_size = 0;
-        efi_boot_max_var_size = status;
-        PrintStr(L"Warning: Could not query variable store: ");
-        DisplayUint(status, 0);
-        PrintStr(newline);
-    }
+    efi_variables();
 
     efi_arch_memory_setup();
 
-- 
1.7.10.4


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