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1d5d0ae9 | 1 | //\r |
2 | // Copyright (c) 2011, ARM Limited. All rights reserved.\r | |
3 | // \r | |
4 | // 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 | //\r | |
13 | \r | |
14 | #include <AsmMacroIoLib.h>\r | |
15 | #include <Base.h>\r | |
16 | #include <Library/PcdLib.h>\r | |
17 | #include <ArmPlatform.h>\r | |
18 | #include <AutoGen.h>\r | |
19 | \r | |
20 | #Start of Code section\r | |
21 | .text\r | |
22 | .align 3\r | |
23 | \r | |
24 | GCC_ASM_EXPORT(ArmPlatformIsMemoryInitialized)\r | |
25 | GCC_ASM_EXPORT(ArmPlatformInitializeBootMemory)\r | |
26 | \r | |
27 | /** | |
28 | Called at the early stage of the Boot phase to know if the memory has already been initialized | |
29 | ||
30 | Running the code from the reset vector does not mean we start from cold boot. In some case, we | |
31 | can go through this code with the memory already initialized. | |
32 | Because this function is called at the early stage, the implementation must not use the stack. | |
33 | Its implementation must probably done in assembly to ensure this requirement. | |
34 | ||
35 | @return Return the condition value into the 'Z' flag | |
36 | ||
37 | **/ | |
38 | ASM_PFX(ArmPlatformIsMemoryInitialized):\r | |
39 | // Check if the memory has been already mapped, if so skipped the memory initialization | |
40 | LoadConstantToReg (ARM_EB_SYSCTRL, r0) | |
41 | ldr r0, [r0, #0] | |
42 | ||
43 | // 0x200 (BIT9): This read-only bit returns the remap status. | |
44 | and r0, r0, #0x200 | |
45 | tst r0, #0x200 | |
46 | bx lr\r | |
47 | \r | |
48 | /** | |
49 | Initialize the memory where the initial stacks will reside | |
50 | ||
51 | This memory can contain the initial stacks (Secure and Secure Monitor stacks). | |
52 | In some platform, this region is already initialized and the implementation of this function can | |
53 | do nothing. This memory can also represent the Secure RAM. | |
54 | This function is called before the satck has been set up. Its implementation must ensure the stack | |
55 | pointer is not used (probably required to use assembly language) | |
56 | ||
57 | **/ | |
58 | ASM_PFX(ArmPlatformInitializeBootMemory):\r | |
59 | // The SMC does not need to be initialized for RTSM\r | |
60 | bx lr\r | |
61 | \r | |
62 | .end\r |