1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR> 4 # This program and the accompanying materials 5 # are licensed and made available under the terms and conditions of the BSD License 6 # which accompanies this distribution. The full text of the license may be found at 7 # http://opensource.org/licenses/bsd-license.php 8 # 9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 # 12 # Module Name: 13 # ProcessorAsms.S 14 # 15 # Abstract: 16 # This is separated from processor.c to allow this functions to be built with /O1 17 # 18 # 19 #------------------------------------------------------------------------------ 20 #include <EfiBind.h> 21 22 .text 23 24 .globl ASM_PFX(SwitchStacks) 25 .globl ASM_PFX(TransferControlSetJump) 26 .globl ASM_PFX(TransferControlLongJump) 27 28 # 29 # Routine Description: 30 # This allows the caller to switch the stack and goes to the new entry point 31 # 32 # Arguments: 33 # EntryPoint - Pointer to the location to enter // rcx 34 # Parameter - Parameter to pass in // rdx 35 # NewStack - New Location of the stack // r8 36 # NewBsp - New BSP // r9 - not used 37 # 38 # Returns: 39 # Nothing. Goes to the Entry Point passing in the new parameters 40 # 41 ASM_PFX(SwitchStacks): 42 43 # Adjust stack for 44 # 1) leave 4 registers space 45 # 2) let it 16 bytes aligned after call 46 sub $0x20,%r8 47 and -0x10,%r8w # do not assume 16 bytes aligned 48 49 mov %r8,%rsp 50 mov %rcx,%r10 51 mov %rdx,%rcx 52 callq *%r10 53 54 # 55 # no ret as we have a new stack and we jumped to the new location 56 # 57 ret 58 59 #SwitchStacks ENDP 60 61 62 .set EFI_SUCCESS, 0 63 .set EFI_WARN_RETURN_FROM_LONG_JUMP, 5 64 65 # 66 #Routine Description: 67 # 68 # This routine implements the x64 variant of the SetJump call. Its 69 # responsibility is to store system state information for a possible 70 # subsequent LongJump. 71 # 72 #Arguments: 73 # 74 # Pointer to CPU context save buffer. 75 # 76 #Returns: 77 # 78 # EFI_SUCCESS 79 # 80 # EFI_STATUS 81 # EFIAPI 82 # TransferControlLongJump ( 83 # IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This, 84 # IN EFI_JUMP_BUFFER *Jump 85 # ); 86 # 87 # rcx - *This 88 # rdx - JumpBuffer 89 # 90 ASM_PFX(TransferControlSetJump): 91 mov %rbx,(%rdx) 92 mov %rsp,0x8(%rdx) 93 mov %rbp,0x10(%rdx) 94 mov %rdi,0x18(%rdx) 95 mov %rsi,0x20(%rdx) 96 mov %r10,0x28(%rdx) 97 mov %r11,0x30(%rdx) 98 mov %r12,0x38(%rdx) 99 mov %r13,0x40(%rdx) 100 mov %r14,0x48(%rdx) 101 mov %r15,0x50(%rdx) 102 #; save non-volatile fp registers 103 stmxcsr 0x60(%rdx) 104 lea 0x68(%rdx), %rax 105 movdqu %xmm6, (%rax) 106 movdqu %xmm7, 0x10(%rax) 107 movdqu %xmm8, 0x20(%rax) 108 movdqu %xmm9, 0x30(%rax) 109 movdqu %xmm10, 0x40(%rax) 110 movdqu %xmm11, 0x50(%rax) 111 movdqu %xmm12, 0x60(%rax) 112 movdqu %xmm13, 0x70(%rax) 113 movdqu %xmm14, 0x80(%rax) 114 movdqu %xmm15, 0x90(%rax) 115 mov (%rsp),%rax 116 mov %rax,0x58(%rdx) 117 mov $0x0,%rax 118 retq 119 120 121 # 122 # EFI_STATUS 123 # EFIAPI 124 # TransferControlLongJump ( 125 # IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This, // rcx 126 # IN EFI_JUMP_BUFFER *Jump // rdx 127 # ); 128 # 129 # 130 ASM_PFX(TransferControlLongJump): 131 # set return from SetJump to EFI_WARN_RETURN_FROM_LONG_JUMP 132 #; load non-volatile fp registers 133 ldmxcsr 0x60(%rdx) 134 lea 0x68(%rdx), %rax 135 movdqu (%rax), %xmm6 136 movdqu 0x10(%rax), %xmm7 137 movdqu 0x20(%rax), %xmm8 138 movdqu 0x30(%rax), %xmm9 139 movdqu 0x40(%rax), %xmm10 140 movdqu 0x50(%rax), %xmm11 141 movdqu 0x60(%rax), %xmm12 142 movdqu 0x70(%rax), %xmm13 143 movdqu 0x80(%rax), %xmm14 144 movdqu 0x90(%rax), %xmm15 145 mov $0x5,%rax 146 mov (%rdx),%rbx 147 mov 0x8(%rdx),%rsp 148 mov 0x10(%rdx),%rbp 149 mov 0x18(%rdx),%rdi 150 mov 0x20(%rdx),%rsi 151 mov 0x28(%rdx),%r10 152 mov 0x30(%rdx),%r11 153 mov 0x38(%rdx),%r12 154 mov 0x40(%rdx),%r13 155 mov 0x48(%rdx),%r14 156 mov 0x50(%rdx),%r15 157 add $0x8,%rsp 158 jmpq *0x58(%rdx) 159 mov $0x5,%rax 160 retq 161 162
