| Simon Glass | 8f963e1 | 2019-12-06 21:42:25 -0700 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * Copyright 2017 Intel Corp. |
| 4 | * Copyright 2019 Google LLC |
| 5 | * Taken from coreboot file exit_car.S |
| 6 | */ |
| 7 | |
| 8 | #include <config.h> |
| 9 | #include <asm/msr-index.h> |
| 10 | #include <asm/mtrr.h> |
| 11 | |
| 12 | .text |
| 13 | .global car_uninit |
| 14 | car_uninit: |
| 15 | |
| 16 | /* |
| 17 | * Retrieve return address from stack as it will get trashed below if |
| 18 | * execution is utilizing the cache-as-ram stack. |
| 19 | */ |
| 20 | pop %ebx |
| 21 | |
| 22 | /* Disable MTRRs */ |
| 23 | mov $(MTRR_DEF_TYPE_MSR), %ecx |
| 24 | rdmsr |
| 25 | and $(~(MTRR_DEF_TYPE_EN | MTRR_DEF_TYPE_FIX_EN)), %eax |
| 26 | wrmsr |
| 27 | |
| 28 | #ifdef CONFIG_INTEL_CAR_NEM |
| 29 | .global car_nem_teardown |
| 30 | car_nem_teardown: |
| 31 | |
| 32 | /* invalidate cache contents */ |
| 33 | invd |
| 34 | |
| 35 | /* Knock down bit 1 then bit 0 of NEM control not combining steps */ |
| 36 | mov $(MSR_EVICT_CTL), %ecx |
| 37 | rdmsr |
| 38 | and $(~(1 << 1)), %eax |
| 39 | wrmsr |
| 40 | and $(~(1 << 0)), %eax |
| 41 | wrmsr |
| 42 | |
| 43 | #elif IS_ENABLED(CONFIG_INTEL_CAR_CQOS) |
| 44 | .global car_cqos_teardown |
| 45 | car_cqos_teardown: |
| 46 | |
| 47 | /* Go back to all-evicting mode, set both masks to all-1s */ |
| 48 | mov $MSR_L2_QOS_MASK(0), %ecx |
| 49 | rdmsr |
| 50 | mov $~0, %al |
| 51 | wrmsr |
| 52 | |
| 53 | mov $MSR_L2_QOS_MASK(1), %ecx |
| 54 | rdmsr |
| 55 | mov $~0, %al |
| 56 | wrmsr |
| 57 | |
| 58 | /* Reset CLOS selector to 0 */ |
| 59 | mov $MSR_IA32_PQR_ASSOC, %ecx |
| 60 | rdmsr |
| 61 | and $~MSR_IA32_PQR_ASSOC_MASK, %edx |
| 62 | wrmsr |
| 63 | |
| 64 | #elif IS_ENABLED(CONFIG_INTEL_CAR_NEM_ENHANCED) |
| 65 | .global car_nem_enhanced_teardown |
| 66 | car_nem_enhanced_teardown: |
| 67 | |
| 68 | /* invalidate cache contents */ |
| 69 | invd |
| 70 | |
| 71 | /* Knock down bit 1 then bit 0 of NEM control not combining steps */ |
| 72 | mov $(MSR_EVICT_CTL), %ecx |
| 73 | rdmsr |
| 74 | and $(~(1 << 1)), %eax |
| 75 | wrmsr |
| 76 | and $(~(1 << 0)), %eax |
| 77 | wrmsr |
| 78 | |
| 79 | /* Reset CLOS selector to 0 */ |
| 80 | mov $IA32_PQR_ASSOC, %ecx |
| 81 | rdmsr |
| 82 | and $~IA32_PQR_ASSOC_MASK, %edx |
| 83 | wrmsr |
| 84 | #endif |
| 85 | |
| 86 | /* Return to caller */ |
| 87 | jmp *%ebx |