projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 1bc83266 | 1 | #========================================================================================\r |
| 73ca5009 | 2 | # Copyright (c) 2011-2014, ARM Limited. All rights reserved.\r |
| 1bc83266 HL |
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 | |
| 919a3a02 BJ |
21 | GCC_ASM_EXPORT(SwitchToNSExceptionLevel1)\r |
| 22 | GCC_ASM_EXPORT(enter_monitor_mode)\r | |
| 23 | GCC_ASM_EXPORT(return_from_exception)\r | |
| 24 | GCC_ASM_EXPORT(copy_cpsr_into_spsr)\r | |
| 25 | GCC_ASM_EXPORT(set_non_secure_mode)\r | |
| 1bc83266 | 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 | |
| 73ca5009 | 34 | and x0, x0, #~(ARM_HCR_FMO | ARM_HCR_IMO | ARM_HCR_AMO) // Disable virtual FIQ, IRQ, SError and Abort\r |
| 1bc83266 HL |
35 | msr hcr_el2, x0 // Write back our settings\r |
| 36 | \r | |
| 37 | msr cptr_el2, xzr // Disable copro traps to EL2\r | |
| 38 | \r | |
| 39 | msr sctlr_el2, xzr\r | |
| 40 | \r | |
| 41 | // Enable architected timer access\r | |
| 42 | mrs x0, cnthctl_el2\r | |
| 43 | orr x0, x0, #3 // Enable EL1 access to timers\r | |
| 44 | msr cnthctl_el2, x0\r | |
| 45 | \r | |
| 46 | mrs x0, cntkctl_el1\r | |
| 47 | orr x0, x0, #3 // EL0 access to counters\r | |
| 48 | msr cntkctl_el1, x0\r | |
| 49 | \r | |
| 50 | // Set ID regs\r | |
| 51 | mrs x0, midr_el1\r | |
| 52 | mrs x1, mpidr_el1\r | |
| 53 | msr vpidr_el2, x0\r | |
| 54 | msr vmpidr_el2, x1\r | |
| 55 | \r | |
| 56 | ret\r | |
| 57 | \r | |
| 58 | \r | |
| 59 | // EL3 on AArch64 is Secure/monitor so this funtion is reduced vs ARMv7\r | |
| 60 | // we don't need a mode switch, just setup the Arguments and jump.\r | |
| 61 | // x0: Monitor World EntryPoint\r | |
| 62 | // x1: MpId\r | |
| 63 | // x2: SecBootMode\r | |
| 64 | // x3: Secure Monitor mode stack\r | |
| 65 | ASM_PFX(enter_monitor_mode):\r | |
| 66 | mov x4, x0 // Swap EntryPoint and MpId registers\r | |
| 67 | mov x0, x1\r | |
| 68 | mov x1, x2\r | |
| 69 | mov x2, x3\r | |
| 70 | br x4\r | |
| 71 | \r | |
| 72 | // Put the address in correct ELR_ELx and do a eret.\r | |
| 73 | // We may need to do some config before we change to another Mode.\r | |
| 74 | ASM_PFX(return_from_exception):\r | |
| 75 | msr elr_el3, x0\r | |
| 1bc83266 HL |
76 | eret\r |
| 77 | \r | |
| 78 | // For AArch64 we need to construct the spsr we want from individual bits and pieces.\r | |
| 79 | ASM_PFX(copy_cpsr_into_spsr):\r | |
| 80 | mrs x0, CurrentEl // Get the current exception level we are running at.\r | |
| 81 | mrs x1, SPSel // Which Stack are we using\r | |
| 82 | orr x0, x0, x1\r | |
| 83 | mrs x1, daif // Which interrupts are enabled\r | |
| 84 | orr x0, x0, x1\r | |
| 85 | msr spsr_el3, x0 // Write to spsr\r | |
| 86 | ret\r | |
| 87 | \r | |
| 88 | // Get this from platform file.\r | |
| 89 | ASM_PFX(set_non_secure_mode):\r | |
| 90 | msr spsr_el3, x0\r | |
| 91 | ret\r | |
| 92 | \r | |
| 1bc83266 | 93 | ASM_FUNCTION_REMOVE_IF_UNREFERENCED\r |