mirror of https://github.com/acidanthera/audk.git
92 lines
2.6 KiB
ArmAsm
92 lines
2.6 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(JumpToKernel)
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ASM_GLOBAL ASM_PFX(JumpToUefiKernel)
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#------------------------------------------------------------------------------
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# VOID
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# EFIAPI
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# JumpToKernel (
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# VOID *KernelStart, // %rcx
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# VOID *KernelBootParams // %rdx
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# );
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#------------------------------------------------------------------------------
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ASM_PFX(JumpToKernel):
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// Set up for executing kernel. BP in %esi, entry point on the stack
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// (64-bit when the 'ret' will use it as 32-bit, but we're little-endian)
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movq %rdx, %rsi
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pushq %rcx
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// Jump into the compatibility mode CS
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pushq $0x10
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leaq 1f(%rip), %rax
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pushq %rax
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.byte 0x48, 0xcb // retfq
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1: // Now in compatibility mode
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.code32
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movl $0x18, %eax
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %fs
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movl %eax, %gs
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movl %eax, %ss
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// Disable paging
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movl %cr0, %eax
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btcl $31, %eax
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movl %eax, %cr0
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// Disable long mode in EFER
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movl $0x0c0000080, %ecx
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rdmsr
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btcl $8, %eax
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wrmsr
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// Disable PAE
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movl %cr4, %eax
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btcl $5, %eax
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movl %eax, %cr4
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// Zero registers and 'return' to kernel
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xorl %ebp, %ebp
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xorl %edi, %edi
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xorl %ebx, %ebx
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ret
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.code64
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#------------------------------------------------------------------------------
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# VOID
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# EFIAPI
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# JumpToUefiKernel (
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# EFI_HANDLE ImageHandle, // rcx
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# EFI_SYSTEM_TABLE *SystemTable, // rdx
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# VOID *KernelBootParams, // r8
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# VOID *KernelStart // r9
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# );
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#------------------------------------------------------------------------------
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ASM_PFX(JumpToUefiKernel):
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movq %rcx, %rdi
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movq %rdx, %rsi
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movq %r8, %rdx
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xor %rax, %rax
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movl 0x264(%r8), %eax
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addq %rax, %r9
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addq $0x200, %r9
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callq %r9
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ret
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