OvmfPkg LoadLinuxLib: Use kernel's EFI entry point where available

Usage of the EFI entry point was made feasible in the kernel
x64 boot protocol 2.12 where a 32-bit & 64-bit entry point
became well defined.

http://git.kernel.org/linus/09c205af

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14132 6f19259b-4bc3-4df7-8a09-765794883524

6 files changed, 107 insertions, 7 deletions

diff --git a/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.S b/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.S
index b8cd4ca515..f7440f74c4 100644
--- a/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.S
+++ b/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.S
@@ -1,6 +1,6 @@
 #------------------------------------------------------------------------------

 #

-# Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>

+# Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>

 #

 # This program and the accompanying materials

 # are licensed and made available under the terms and conditions of the BSD License

@@ -13,6 +13,7 @@
 #------------------------------------------------------------------------------

 

 ASM_GLOBAL ASM_PFX(JumpToKernel)

+ASM_GLOBAL ASM_PFX(JumpToUefiKernel)

 

 #------------------------------------------------------------------------------

 # VOID

@@ -27,3 +28,19 @@ ASM_PFX(JumpToKernel):
     calll   0x4(%esp)

     ret

 

+#------------------------------------------------------------------------------

+# VOID

+# EFIAPI

+# JumpToUefiKernel (

+#   EFI_HANDLE ImageHandle,

+#   EFI_SYSTEM_TABLE *SystemTable,

+#   VOID *KernelBootParams,

+#   VOID *KernelStart

+#   );

+#------------------------------------------------------------------------------

+ASM_PFX(JumpToUefiKernel):

+    movl    0xc(%esp), %eax

+    movl    0x264(%eax), %eax

+    addl    0x10(%esp), %eax

+    jmp     %eax

+

diff --git a/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.asm b/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.asm
index a8f3965f9a..21d0c4e724 100644
--- a/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.asm
+++ b/OvmfPkg/Library/LoadLinuxLib/Ia32/JumpToKernel.asm
@@ -1,6 +1,6 @@
 ;------------------------------------------------------------------------------

 ;

-; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>

+; Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>

 ;

 ; This program and the accompanying materials

 ; are licensed and made available under the terms and conditions of the BSD License

@@ -32,4 +32,23 @@ JumpToKernel PROC
 

 JumpToKernel ENDP

 

+;------------------------------------------------------------------------------

+; VOID

+; EFIAPI

+; JumpToUefiKernel (

+;   EFI_HANDLE ImageHandle,

+;   EFI_SYSTEM_TABLE *SystemTable,

+;   VOID *KernelBootParams,

+;   VOID *KernelStart

+;   );

+;------------------------------------------------------------------------------

+JumpToUefiKernel PROC

+

+    mov     eax, [esp + 12]

+    mov     eax, [eax + 264h]

+    add     eax, [esp + 16]

+    jmp     eax

+

+JumpToUefiKernel ENDP

+

 END

diff --git a/OvmfPkg/Library/LoadLinuxLib/Linux.c b/OvmfPkg/Library/LoadLinuxLib/Linux.c
index 1da5507ff1..c714225e55 100644
--- a/OvmfPkg/Library/LoadLinuxLib/Linux.c
+++ b/OvmfPkg/Library/LoadLinuxLib/Linux.c
@@ -604,14 +604,11 @@ SetupGraphics (
 STATIC

 EFI_STATUS

 SetupLinuxBootParams (

-  IN VOID                   *Kernel,

   IN OUT struct boot_params *Bp

   )

 {

   SetupGraphics (Bp);

 

-  Bp->hdr.code32_start = (UINT32)(UINTN) Kernel;

-

   SetupLinuxMemmap (Bp);

 

   return EFI_SUCCESS;

@@ -644,7 +641,19 @@ LoadLinux (
 

   InitLinuxDescriptorTables ();

 

-  SetupLinuxBootParams (Kernel, (struct boot_params*) KernelSetup);

+  Bp->hdr.code32_start = (UINT32)(UINTN) Kernel;

+  if (Bp->hdr.version >= 0x20c && Bp->hdr.handover_offset &&

+      (Bp->hdr.load_flags & (sizeof (UINTN) == 4 ? BIT2 : BIT3))) {

+    DEBUG ((EFI_D_INFO, "Jumping to kernel EFI handover point at ofs %x\n", Bp->hdr.handover_offset));

+

+    DisableInterrupts ();

+    JumpToUefiKernel ((VOID*) gImageHandle, (VOID*) gST, KernelSetup, Kernel);

+  }

+

+  //

+  // Old kernels without EFI handover protocol

+  //

+  SetupLinuxBootParams (KernelSetup);

 

   DEBUG ((EFI_D_INFO, "Jumping to kernel\n"));

   DisableInterrupts ();

diff --git a/OvmfPkg/Library/LoadLinuxLib/LoadLinuxLib.h b/OvmfPkg/Library/LoadLinuxLib/LoadLinuxLib.h
index f869797262..045cbf9b2f 100644
--- a/OvmfPkg/Library/LoadLinuxLib/LoadLinuxLib.h
+++ b/OvmfPkg/Library/LoadLinuxLib/LoadLinuxLib.h
@@ -1,7 +1,7 @@
 /** @file

   Boot UEFI Linux.

 

-  Copyright (c) 2008 - 2011, Intel Corporation. All rights reserved.<BR>

+  Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>

 

   This program and the accompanying materials

   are licensed and made available under the terms and conditions of the BSD License

@@ -37,6 +37,15 @@ JumpToKernel (
   );

 

 VOID

+EFIAPI

+JumpToUefiKernel (

+  EFI_HANDLE ImageHandle,

+  EFI_SYSTEM_TABLE *SystemTable,

+  VOID *KernelBootParams,

+  VOID *KernelStart

+  );

+

+VOID

 InitLinuxDescriptorTables (

   VOID

   );

diff --git a/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.S b/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.S
index edc6e7bd70..056e3c013f 100644
--- a/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.S
+++ b/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.S
@@ -13,6 +13,7 @@
 #------------------------------------------------------------------------------

 

 ASM_GLOBAL ASM_PFX(JumpToKernel)

+ASM_GLOBAL ASM_PFX(JumpToUefiKernel)

 

 #------------------------------------------------------------------------------

 # VOID

@@ -67,3 +68,24 @@ ASM_PFX(JumpToKernel):
     ret

 .code64

 

+#------------------------------------------------------------------------------

+# VOID

+# EFIAPI

+# JumpToUefiKernel (

+#   EFI_HANDLE ImageHandle,        // rcx

+#   EFI_SYSTEM_TABLE *SystemTable, // rdx

+#   VOID *KernelBootParams,        // r8

+#   VOID *KernelStart              // r9

+#   );

+#------------------------------------------------------------------------------

+ASM_PFX(JumpToUefiKernel):

+    movq    %rcx, %rdi

+    movq    %rdx, %rsi

+    movq    %r8, %rdx

+    xor     %rax, %rax

+    movl    0x264(%r8), %eax

+    addq    %rax, %r9

+    addq    $0x200, %r9

+    callq   %r9

+    ret

+

diff --git a/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.asm b/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.asm
index bcf6260e1d..fc07eab684 100644
--- a/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.asm
+++ b/OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.asm
@@ -68,4 +68,28 @@ JumpToKernel PROC
 

 JumpToKernel ENDP

 

+;------------------------------------------------------------------------------

+; VOID

+; EFIAPI

+; JumpToUefiKernel (

+;   EFI_HANDLE ImageHandle,        // rcx

+;   EFI_SYSTEM_TABLE *SystemTable, // rdx

+;   VOID *KernelBootParams         // r8

+;   VOID *KernelStart,             // r9

+;   );

+;------------------------------------------------------------------------------

+JumpToUefiKernel PROC

+

+    mov     rdi, rcx

+    mov     rsi, rdx

+    mov     rdx, r8

+    xor     rax, rax

+    mov     eax, [r8 + 264h]

+    add     r9, rax

+    add     r9, 200h

+    call    r9

+    ret

+

+JumpToUefiKernel ENDP

+

 END