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b1ff428c | 1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2006 - 2008, Intel Corporation\r | |
4 | # All rights reserved. This program and the accompanying materials\r | |
5 | # are licensed and made available under the terms and conditions of the BSD License\r | |
6 | # which accompanies this distribution. The full text of the license may be found at\r | |
7 | # http://opensource.org/licenses/bsd-license.php\r | |
8 | #\r | |
9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | #\r | |
12 | # Module Name:\r | |
13 | #\r | |
14 | # DisablePaging64.S\r | |
15 | #\r | |
16 | # Abstract:\r | |
17 | #\r | |
18 | # AsmDisablePaging64 function\r | |
19 | #\r | |
20 | # Notes:\r | |
21 | #\r | |
22 | #------------------------------------------------------------------------------\r | |
23 | \r | |
24 | \r | |
25 | \r | |
26 | #------------------------------------------------------------------------------\r | |
27 | # VOID\r | |
28 | # EFIAPI\r | |
29 | # InternalX86DisablePaging64 (\r | |
30 | # IN UINT16 Cs,\r | |
2561f565 | 31 | # IN UINT32 EntryPoint,\r |
32 | # IN UINT32 Context1, OPTIONAL\r | |
b1ff428c | 33 | # IN UINT32 Context2, OPTIONAL\r |
2561f565 | 34 | # IN UINT32 NewStack\r |
b1ff428c | 35 | # );\r |
36 | #------------------------------------------------------------------------------\r | |
37 | \r | |
d5172f91 | 38 | ASM_GLOBAL ASM_PFX(InternalX86DisablePaging64)\r |
b1ff428c | 39 | ASM_PFX(InternalX86DisablePaging64):\r |
2e56bb15 | 40 | cli |
41 | lea L1(%rip), %rsi # rsi <- The start address of transition code | |
0d654ba4 | 42 | mov 0x28(%rsp), %edi # rdi <- New stack |
43 | sub $64, %edi # rdi <- use 64 byte in stack to hold transition code | |
44 | mov %edi, %r10d # r10 <- The start address of transicition code below 4G | |
2e56bb15 | 45 | lea _mTransitionEnd(%rip), %rax # rax <- end of transition code |
46 | sub %rsi, %rax # rax <- The size of transition piece code | |
47 | push %rcx # save rcx to stack | |
48 | mov %rax, %rcx # rcx <- The size of transition piece code | |
49 | rep | |
50 | movsb # copy transition code to (new stack - 64byte) below 4G | |
51 | pop %rcx # restore rcx | |
52 | \r | |
c2049caa | 53 | mov %r8d, %esi \r |
c2049caa | 54 | mov %r9d, %edi \r |
2faf4da5 | 55 | mov 0x28(%rsp), %eax # eax <- New Stack\r |
2561f565 | 56 | push %rcx # push Cs to stack\r |
57 | push %r10\r | |
58 | .byte 0x48, 0xcb # retq: Use far return to load CS register from stack\r | |
59 | # (Use raw byte code since some GNU assemblers generates incorrect code for "retq") \r | |
b1ff428c | 60 | L1:\r |
61 | mov %eax,%esp # set up new stack\r | |
62 | mov %cr0,%rax\r | |
63 | btr $0x1f,%eax\r | |
64 | mov %rax,%cr0 # disable paging\r | |
63d7211e | 65 | \r |
66 | mov %rdx,%rbx # save EntryPoint to rbx, for rdmsr will overwrite rdx\r | |
b1ff428c | 67 | mov $0xc0000080,%ecx\r |
68 | rdmsr \r | |
69 | and $0xfe,%ah # clear LME\r | |
70 | wrmsr \r | |
71 | mov %cr4,%rax\r | |
72 | and $0xdf,%al # clear PAE\r | |
73 | mov %rax,%cr4\r | |
74 | push %rdi # push Context2\r | |
75 | push %rsi # push Context1\r | |
63d7211e | 76 | callq *%rbx # transfer control to EntryPoint\r |
b1ff428c | 77 | jmp . # no one should get here\r |
2e56bb15 | 78 | \r_mTransitionEnd : |