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1 | #------------------------------------------------------------------------------ \r | |
2 | #\r | |
3 | # ARM EB Entry point. Reset vector in FV header will brach to\r | |
4 | # _ModuleEntryPoint. \r | |
5 | #\r | |
6 | # We use crazy macros, like LoadConstantToReg, since Xcode assembler \r | |
7 | # does not support = assembly syntax for ldr.\r | |
8 | #\r | |
9 | # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
10 | #\r | |
11 | # This program and the accompanying materials\r | |
12 | # are licensed and made available under the terms and conditions of the BSD License\r | |
13 | # which accompanies this distribution. The full text of the license may be found at\r | |
14 | # http://opensource.org/licenses/bsd-license.php\r | |
15 | #\r | |
16 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
17 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
18 | #\r | |
19 | #------------------------------------------------------------------------------\r | |
20 | \r | |
21 | #include <AsmMacroIoLib.h>\r | |
22 | #include <Base.h>\r | |
23 | #include <Library/PcdLib.h>\r | |
24 | #include <ArmEb/ArmEb.h>\r | |
25 | \r | |
26 | .text\r | |
27 | .align 3\r | |
28 | \r | |
29 | .globl ASM_PFX(CEntryPoint)\r | |
30 | .globl ASM_PFX(_ModuleEntryPoint)\r | |
31 | \r | |
32 | ASM_PFX(_ModuleEntryPoint):\r | |
33 | \r | |
34 | // Turn off remapping NOR to 0. We can now use DRAM in low memory\r | |
35 | MmioOr32 (EB_SP810_CTRL_BASE ,BIT8) \r | |
36 | \r | |
37 | // Enable NEON register in case folks want to use them for optimizations (CopyMem)\r | |
38 | mrc p15, 0, r0, c1, c0, 2\r | |
39 | orr r0, r0, #0x00f00000 // Enable VPF access (V* instructions)\r | |
40 | mcr p15, 0, r0, c1, c0, 2\r | |
41 | mov r0, #0x40000000 // Set EN bit in FPEXC\r | |
42 | mcr p10,#0x7,r0,c8,c0,#0 // msr FPEXC,r0 in ARM assembly\r | |
43 | \r | |
44 | \r | |
45 | // Set CPU vectors to start of DRAM\r | |
46 | LoadConstantToReg (FixedPcdGet32(PcdCpuVectorBaseAddress) ,r0) // Get vector base\r | |
47 | mcr p15, 0, r0, c12, c0, 0\r | |
48 | isb // Sync changes to control registers\r | |
49 | \r | |
50 | // Fill vector table with branchs to current pc (jmp $)\r | |
51 | // CPU DXE driver likes known values so it can let GDB stub hook vectors\r | |
52 | ldr r1, ShouldNeverGetHere\r | |
53 | movs r2, #0\r | |
54 | FillVectors:\r | |
55 | str r1, [r0, r2]\r | |
56 | adds r2, r2, #4\r | |
57 | cmp r2, #32\r | |
58 | bne FillVectors\r | |
59 | \r | |
60 | //\r | |
61 | // Set stack based on PCD values. Need to do it this way to make C code work \r | |
62 | // when it runs from FLASH. \r | |
63 | // \r | |
64 | LoadConstantToReg (FixedPcdGet32(PcdPrePiStackBase) ,r2) // stack base arg2 \r | |
65 | LoadConstantToReg (FixedPcdGet32(PcdPrePiStackSize) ,r3) // stack size arg3 \r | |
66 | add r4, r2, r3\r | |
67 | mov r13, r4\r | |
68 | \r | |
69 | // Call C entry point\r | |
70 | LoadConstantToReg (FixedPcdGet32(PcdMemorySize) ,r1) // memory size arg1 \r | |
71 | LoadConstantToReg (FixedPcdGet32(PcdMemoryBase) ,r0) // memory size arg0 \r | |
72 | blx ASM_PFX(CEntryPoint) \r | |
73 | \r | |
74 | ShouldNeverGetHere:\r | |
75 | // _CEntryPoint should never return \r | |
76 | b ShouldNeverGetHere\r | |
77 | \r | |
78 | \r |