Merge pull request #1305 from dp-arm/dp/smccc
Implement support for v1.2 of firmware interfaces spec (ARM DEN 0070A)
This commit is contained in:
commit
6dd74c5b65
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@ -61,8 +61,8 @@ BL31_SOURCES += lib/extensions/sve/sve.c
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endif
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ifeq (${WORKAROUND_CVE_2017_5715},1)
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BL31_SOURCES += lib/cpus/aarch64/workaround_cve_2017_5715_mmu.S \
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lib/cpus/aarch64/workaround_cve_2017_5715_bpiall.S
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BL31_SOURCES += lib/cpus/aarch64/workaround_cve_2017_5715_bpiall.S \
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lib/cpus/aarch64/workaround_cve_2017_5715_mmu.S
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endif
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BL31_LINKERFILE := bl31/bl31.ld.S
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
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* Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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@ -46,6 +46,8 @@ CPU_MIDR: /* cpu_ops midr */
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CPU_RESET_FUNC: /* cpu_ops reset_func */
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.space 8
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#endif
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CPU_EXTRA1_FUNC:
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.space 8
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#ifdef IMAGE_BL31 /* The power down core and cluster is needed only in BL31 */
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CPU_PWR_DWN_OPS: /* cpu_ops power down functions */
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.space (8 * CPU_MAX_PWR_DWN_OPS)
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@ -113,6 +115,10 @@ CPU_OPS_SIZE = .
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* _resetfunc:
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* Reset function for the CPU. If there's no CPU reset function,
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* specify CPU_NO_RESET_FUNC
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* _extra1:
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* This is a placeholder for future per CPU operations. Currently,
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* some CPUs use this entry to set a test function to determine if
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* the workaround for CVE-2017-5715 needs to be applied or not.
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* _power_down_ops:
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* Comma-separated list of functions to perform power-down
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* operatios on the CPU. At least one, and up to
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@ -122,8 +128,8 @@ CPU_OPS_SIZE = .
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* CPU_MAX_PWR_DWN_OPS functions, the last specified one will be
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* used to handle power down at subsequent levels
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*/
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.macro declare_cpu_ops _name:req, _midr:req, _resetfunc:req, \
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_power_down_ops:vararg
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.macro declare_cpu_ops_base _name:req, _midr:req, _resetfunc:req, \
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_extra1:req, _power_down_ops:vararg
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.section cpu_ops, "a"
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.align 3
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.type cpu_ops_\_name, %object
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@ -131,6 +137,7 @@ CPU_OPS_SIZE = .
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#if defined(IMAGE_AT_EL3)
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.quad \_resetfunc
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#endif
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.quad \_extra1
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#ifdef IMAGE_BL31
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1:
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/* Insert list of functions */
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@ -187,6 +194,18 @@ CPU_OPS_SIZE = .
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#endif
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.endm
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.macro declare_cpu_ops _name:req, _midr:req, _resetfunc:req, \
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_power_down_ops:vararg
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declare_cpu_ops_base \_name, \_midr, \_resetfunc, 0, \
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\_power_down_ops
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.endm
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.macro declare_cpu_ops_workaround_cve_2017_5715 _name:req, _midr:req, \
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_resetfunc:req, _extra1:req, _power_down_ops:vararg
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declare_cpu_ops_base \_name, \_midr, \_resetfunc, \
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\_extra1, \_power_down_ops
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.endm
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#if REPORT_ERRATA
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/*
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* Print status of a CPU errata
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@ -229,3 +248,18 @@ CPU_OPS_SIZE = .
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#endif
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#endif /* __CPU_MACROS_S__ */
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/*
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* This macro is used on some CPUs to detect if they are vulnerable
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* to CVE-2017-5715.
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*/
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.macro cpu_check_csv2 _reg _label
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mrs \_reg, id_aa64pfr0_el1
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ubfx \_reg, \_reg, #ID_AA64PFR0_CSV2_SHIFT, #ID_AA64PFR0_CSV2_LENGTH
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/*
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* If the field equals to 1 then branch targets trained in one
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* context cannot affect speculative execution in a different context.
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*/
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cmp \_reg, #1
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beq \_label
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.endm
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@ -0,0 +1,12 @@
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/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __WORKAROUND_CVE_2017_5715_H__
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#define __WORKAROUND_CVE_2017_5715_H__
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int check_workaround_cve_2017_5715(void);
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#endif /* __WORKAROUND_CVE_2017_5715_H__ */
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@ -555,8 +555,8 @@ func cortex_a57_cpu_reg_dump
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ret
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endfunc cortex_a57_cpu_reg_dump
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declare_cpu_ops cortex_a57, CORTEX_A57_MIDR, \
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declare_cpu_ops_workaround_cve_2017_5715 cortex_a57, CORTEX_A57_MIDR, \
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cortex_a57_reset_func, \
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check_errata_cve_2017_5715, \
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cortex_a57_core_pwr_dwn, \
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cortex_a57_cluster_pwr_dwn
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@ -98,12 +98,16 @@ func check_errata_859971
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endfunc check_errata_859971
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func check_errata_cve_2017_5715
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cpu_check_csv2 x0, 1f
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#if WORKAROUND_CVE_2017_5715
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mov x0, #ERRATA_APPLIES
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#else
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mov x0, #ERRATA_MISSING
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#endif
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ret
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1:
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mov x0, #ERRATA_NOT_APPLIES
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ret
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endfunc check_errata_cve_2017_5715
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/* -------------------------------------------------
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@ -121,8 +125,10 @@ func cortex_a72_reset_func
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#endif
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#if IMAGE_BL31 && WORKAROUND_CVE_2017_5715
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cpu_check_csv2 x0, 1f
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adr x0, workaround_mmu_runtime_exceptions
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msr vbar_el3, x0
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1:
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#endif
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/* ---------------------------------------------
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@ -286,8 +292,8 @@ func cortex_a72_cpu_reg_dump
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ret
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endfunc cortex_a72_cpu_reg_dump
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declare_cpu_ops cortex_a72, CORTEX_A72_MIDR, \
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declare_cpu_ops_workaround_cve_2017_5715 cortex_a72, CORTEX_A72_MIDR, \
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cortex_a72_reset_func, \
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check_errata_cve_2017_5715, \
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cortex_a72_core_pwr_dwn, \
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cortex_a72_cluster_pwr_dwn
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@ -37,8 +37,10 @@ endfunc cortex_a73_disable_smp
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func cortex_a73_reset_func
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#if IMAGE_BL31 && WORKAROUND_CVE_2017_5715
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cpu_check_csv2 x0, 1f
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adr x0, workaround_bpiall_vbar0_runtime_exceptions
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msr vbar_el3, x0
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1:
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#endif
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/* ---------------------------------------------
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@ -115,12 +117,16 @@ func cortex_a73_cluster_pwr_dwn
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endfunc cortex_a73_cluster_pwr_dwn
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func check_errata_cve_2017_5715
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cpu_check_csv2 x0, 1f
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#if WORKAROUND_CVE_2017_5715
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mov x0, #ERRATA_APPLIES
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#else
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mov x0, #ERRATA_MISSING
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#endif
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ret
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1:
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mov x0, #ERRATA_NOT_APPLIES
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ret
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endfunc check_errata_cve_2017_5715
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#if REPORT_ERRATA
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@ -164,7 +170,8 @@ func cortex_a73_cpu_reg_dump
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ret
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endfunc cortex_a73_cpu_reg_dump
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declare_cpu_ops cortex_a73, CORTEX_A73_MIDR, \
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declare_cpu_ops_workaround_cve_2017_5715 cortex_a73, CORTEX_A73_MIDR, \
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cortex_a73_reset_func, \
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check_errata_cve_2017_5715, \
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cortex_a73_core_pwr_dwn, \
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cortex_a73_cluster_pwr_dwn
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@ -12,15 +12,7 @@
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func cortex_a75_reset_func
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#if IMAGE_BL31 && WORKAROUND_CVE_2017_5715
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mrs x0, id_aa64pfr0_el1
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ubfx x0, x0, #ID_AA64PFR0_CSV2_SHIFT, #ID_AA64PFR0_CSV2_LENGTH
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/*
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* If the field equals to 1 then branch targets trained in one
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* context cannot affect speculative execution in a different context.
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*/
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cmp x0, #1
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beq 1f
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cpu_check_csv2 x0, 1f
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adr x0, workaround_bpiall_vbar0_runtime_exceptions
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msr vbar_el3, x0
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1:
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@ -53,15 +45,7 @@ func cortex_a75_reset_func
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endfunc cortex_a75_reset_func
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func check_errata_cve_2017_5715
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mrs x0, id_aa64pfr0_el1
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ubfx x0, x0, #ID_AA64PFR0_CSV2_SHIFT, #ID_AA64PFR0_CSV2_LENGTH
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/*
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* If the field equals to 1 then branch targets trained in one
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* context cannot affect speculative execution in a different context.
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*/
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cmp x0, #1
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beq 1f
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cpu_check_csv2 x0, 1f
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#if WORKAROUND_CVE_2017_5715
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mov x0, #ERRATA_APPLIES
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#else
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@ -129,6 +113,7 @@ func cortex_a75_cpu_reg_dump
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ret
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endfunc cortex_a75_cpu_reg_dump
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declare_cpu_ops cortex_a75, CORTEX_A75_MIDR, \
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declare_cpu_ops_workaround_cve_2017_5715 cortex_a75, CORTEX_A75_MIDR, \
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cortex_a75_reset_func, \
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check_errata_cve_2017_5715, \
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cortex_a75_core_pwr_dwn
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
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* Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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@ -7,9 +7,7 @@
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#include <arch.h>
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#include <asm_macros.S>
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#include <assert_macros.S>
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#if defined(IMAGE_BL31) || (defined(IMAGE_BL2) && BL2_AT_EL3)
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#include <cpu_data.h>
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#endif
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#include <cpu_macros.S>
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#include <debug.h>
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#include <errata_report.h>
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@ -281,3 +279,36 @@ func print_errata_status
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br x1
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endfunc print_errata_status
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#endif
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/*
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* int check_workaround_cve_2017_5715(void);
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*
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* This function returns:
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* - ERRATA_APPLIES when firmware mitigation is required.
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* - ERRATA_NOT_APPLIES when firmware mitigation is _not_ required.
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* - ERRATA_MISSING when firmware mitigation would be required but
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* is not compiled in.
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*
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* NOTE: Must be called only after cpu_ops have been initialized
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* in per-CPU data.
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*/
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.globl check_workaround_cve_2017_5715
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func check_workaround_cve_2017_5715
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mrs x0, tpidr_el3
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#if ENABLE_ASSERTIONS
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cmp x0, #0
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ASM_ASSERT(ne)
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#endif
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ldr x0, [x0, #CPU_DATA_CPU_OPS_PTR]
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ldr x0, [x0, #CPU_EXTRA1_FUNC]
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/*
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* If the reserved function pointer is NULL, this CPU
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* is unaffected by CVE-2017-5715 so bail out.
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*/
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cmp x0, #0
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beq 1f
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br x0
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1:
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mov x0, #ERRATA_NOT_APPLIES
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ret
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endfunc check_workaround_cve_2017_5715
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@ -6,9 +6,11 @@
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#include <arm_arch_svc.h>
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#include <debug.h>
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#include <errata_report.h>
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#include <runtime_svc.h>
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#include <smcc.h>
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#include <smcc_helpers.h>
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#include <workaround_cve_2017_5715.h>
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static int32_t smccc_version(void)
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{
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@ -17,14 +19,19 @@ static int32_t smccc_version(void)
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static int32_t smccc_arch_features(u_register_t arg)
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{
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int ret;
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switch (arg) {
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case SMCCC_VERSION:
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case SMCCC_ARCH_FEATURES:
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return SMC_OK;
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#if WORKAROUND_CVE_2017_5715
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case SMCCC_ARCH_WORKAROUND_1:
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return SMC_OK;
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#endif
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ret = check_workaround_cve_2017_5715();
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if (ret == ERRATA_APPLIES)
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return 0;
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else if (ret == ERRATA_NOT_APPLIES)
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return 1;
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return -1; /* ERRATA_MISSING */
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default:
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return SMC_UNK;
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}
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