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

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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
This commit is contained in:
jljusten
2013-02-14 19:21:39 +00:00
parent 25ca06f9a0
commit dd71f6e287
6 changed files with 107 additions and 7 deletions
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22
OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.S
View File

@@ -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

24
OvmfPkg/Library/LoadLinuxLib/X64/JumpToKernel.asm
View File

@@ -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