[PATCH for-4.5 V7 12/14] Add several misc. arch functions for EFI boot code.

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

Add efi_arch_blexit() for arch specific cleanup on error exit,
efi_arch_load_addr_check() to do the arch specific verifications
of where the UEFI firmware loaded Xen, and efi_arch_cpu() for
probing CPU features.

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
---
 xen/arch/x86/efi/efi-boot.h | 25 +++++++++++++++++++++++++
 xen/common/efi/boot.c       | 18 ++++--------------
 2 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h
index ed5e15b..5c79341 100644
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -591,3 +591,28 @@ static void __init efi_arch_handle_module(struct file *file, const CHAR16 *name,
     ++mbi.mods_count;
     efi_bs->FreePool(ptr);
 }
+
+static void __init efi_arch_cpu(void)
+{
+    if ( cpuid_eax(0x80000000) > 0x80000000 )
+    {
+        cpuid_ext_features = cpuid_edx(0x80000001);
+        boot_cpu_data.x86_capability[1] = cpuid_ext_features;
+    }
+}
+
+static void __init efi_arch_blexit(void)
+{
+    if ( ucode.addr )
+        efi_bs->FreePages(ucode.addr, PFN_UP(ucode.size));
+}
+
+static void __init efi_arch_load_addr_check(EFI_LOADED_IMAGE *loaded_image)
+{
+    xen_phys_start = (UINTN)loaded_image->ImageBase;
+    if ( (xen_phys_start + loaded_image->ImageSize - 1) >> 32 )
+        blexit(L"Xen must be loaded below 4Gb.");
+    if ( xen_phys_start & ((1 << L2_PAGETABLE_SHIFT) - 1) )
+        blexit(L"Xen must be loaded at a 2Mb boundary.");
+    trampoline_xen_phys_start = xen_phys_start;
+}
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index f19db81..5c50243 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -212,11 +212,11 @@ static void __init noreturn blexit(const CHAR16 *str)
         efi_bs->FreePages(kernel.addr, PFN_UP(kernel.size));
     if ( ramdisk.addr )
         efi_bs->FreePages(ramdisk.addr, PFN_UP(ramdisk.size));
-    if ( ucode.addr )
-        efi_bs->FreePages(ucode.addr, PFN_UP(ucode.size));
     if ( xsm.addr )
         efi_bs->FreePages(xsm.addr, PFN_UP(xsm.size));
 
+    efi_arch_blexit();
+
     efi_bs->Exit(efi_ih, EFI_SUCCESS, 0, NULL);
     unreachable(); /* not reached */
 }
@@ -713,12 +713,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
     if ( status != EFI_SUCCESS )
         PrintErrMesg(L"No Loaded Image Protocol", status);
 
-    xen_phys_start = (UINTN)loaded_image->ImageBase;
-    if ( (xen_phys_start + loaded_image->ImageSize - 1) >> 32 )
-        blexit(L"Xen must be loaded below 4Gb.");
-    if ( xen_phys_start & ((1 << L2_PAGETABLE_SHIFT) - 1) )
-        blexit(L"Xen must be loaded at a 2Mb boundary.");
-    trampoline_xen_phys_start = xen_phys_start;
+    efi_arch_load_addr_check(loaded_image);
 
     /* Get the file system interface. */
     dir_handle = get_parent_handle(loaded_image, &file_name);
@@ -966,12 +961,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
     efi_arch_edd();
 
     /* XXX Collect EDID info. */
-
-    if ( cpuid_eax(0x80000000) > 0x80000000 )
-    {
-        cpuid_ext_features = cpuid_edx(0x80000001);
-        boot_cpu_data.x86_capability[1] = cpuid_ext_features;
-    }
+    efi_arch_cpu();
 
     /* Obtain basic table pointers. */
     for ( i = 0; i < efi_num_ct; ++i )
-- 
2.1.0