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1 | #========================================================================================\r |
2 | # Copyright (c) 2011-2013, 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 <AsmMacroIoLibV8.h>\r | |
15 | #include <Chipset/AArch64.h>\r | |
16 | \r | |
17 | #start of the code section\r | |
18 | .text\r | |
19 | .align 3\r | |
20 | \r | |
1bc83266 HL |
21 | ASM_GLOBAL ASM_PFX(SwitchToNSExceptionLevel1)\r |
22 | ASM_GLOBAL ASM_PFX(enter_monitor_mode)\r | |
23 | ASM_GLOBAL ASM_PFX(return_from_exception)\r | |
24 | ASM_GLOBAL ASM_PFX(copy_cpsr_into_spsr)\r | |
25 | ASM_GLOBAL ASM_PFX(set_non_secure_mode)\r | |
26 | \r | |
1bc83266 HL |
27 | // Switch from EL3 to NS-EL1\r |
28 | ASM_PFX(SwitchToNSExceptionLevel1):\r | |
29 | // Now setup our EL1. Controlled by EL2 config on Model\r | |
30 | mrs x0, hcr_el2 // Read EL2 Hypervisor configuration Register\r | |
31 | orr x0, x0, #(1 << 31) // Set EL1 to be 64bit\r | |
32 | \r | |
33 | // Send all interrupts to their respective Exception levels for EL2\r | |
34 | bic x0, x0, #(1 << 3) // Disable virtual FIQ\r | |
35 | bic x0, x0, #(1 << 4) // Disable virtual IRQ\r | |
36 | bic x0, x0, #(1 << 5) // Disable virtual SError and Abort\r | |
37 | msr hcr_el2, x0 // Write back our settings\r | |
38 | \r | |
39 | msr cptr_el2, xzr // Disable copro traps to EL2\r | |
40 | \r | |
41 | msr sctlr_el2, xzr\r | |
42 | \r | |
43 | // Enable architected timer access\r | |
44 | mrs x0, cnthctl_el2\r | |
45 | orr x0, x0, #3 // Enable EL1 access to timers\r | |
46 | msr cnthctl_el2, x0\r | |
47 | \r | |
48 | mrs x0, cntkctl_el1\r | |
49 | orr x0, x0, #3 // EL0 access to counters\r | |
50 | msr cntkctl_el1, x0\r | |
51 | \r | |
52 | // Set ID regs\r | |
53 | mrs x0, midr_el1\r | |
54 | mrs x1, mpidr_el1\r | |
55 | msr vpidr_el2, x0\r | |
56 | msr vmpidr_el2, x1\r | |
57 | \r | |
58 | ret\r | |
59 | \r | |
60 | \r | |
61 | // EL3 on AArch64 is Secure/monitor so this funtion is reduced vs ARMv7\r | |
62 | // we don't need a mode switch, just setup the Arguments and jump.\r | |
63 | // x0: Monitor World EntryPoint\r | |
64 | // x1: MpId\r | |
65 | // x2: SecBootMode\r | |
66 | // x3: Secure Monitor mode stack\r | |
67 | ASM_PFX(enter_monitor_mode):\r | |
68 | mov x4, x0 // Swap EntryPoint and MpId registers\r | |
69 | mov x0, x1\r | |
70 | mov x1, x2\r | |
71 | mov x2, x3\r | |
72 | br x4\r | |
73 | \r | |
74 | // Put the address in correct ELR_ELx and do a eret.\r | |
75 | // We may need to do some config before we change to another Mode.\r | |
76 | ASM_PFX(return_from_exception):\r | |
77 | msr elr_el3, x0\r | |
1bc83266 HL |
78 | eret\r |
79 | \r | |
80 | // For AArch64 we need to construct the spsr we want from individual bits and pieces.\r | |
81 | ASM_PFX(copy_cpsr_into_spsr):\r | |
82 | mrs x0, CurrentEl // Get the current exception level we are running at.\r | |
83 | mrs x1, SPSel // Which Stack are we using\r | |
84 | orr x0, x0, x1\r | |
85 | mrs x1, daif // Which interrupts are enabled\r | |
86 | orr x0, x0, x1\r | |
87 | msr spsr_el3, x0 // Write to spsr\r | |
88 | ret\r | |
89 | \r | |
90 | // Get this from platform file.\r | |
91 | ASM_PFX(set_non_secure_mode):\r | |
92 | msr spsr_el3, x0\r | |
93 | ret\r | |
94 | \r | |
95 | dead:\r | |
96 | b dead\r | |
97 | \r | |
98 | ASM_FUNCTION_REMOVE_IF_UNREFERENCED\r |