blob: 8f0a74f0a3f397b9432f352016142e5fd1c1222f [file] [log] [blame]
/*
* Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __CPU_MACROS_S__
#define __CPU_MACROS_S__
#include <arch.h>
#include <errata_report.h>
#define CPU_IMPL_PN_MASK (MIDR_IMPL_MASK << MIDR_IMPL_SHIFT) | \
(MIDR_PN_MASK << MIDR_PN_SHIFT)
/* The number of CPU operations allowed */
#define CPU_MAX_PWR_DWN_OPS 2
/* Special constant to specify that CPU has no reset function */
#define CPU_NO_RESET_FUNC 0
/* Word size for 64-bit CPUs */
#define CPU_WORD_SIZE 8
#if defined(IMAGE_BL1) || defined(IMAGE_BL31) ||(defined(IMAGE_BL2) && BL2_AT_EL3)
#define IMAGE_AT_EL3
#endif
/*
* Whether errata status needs reporting. Errata status is printed in debug
* builds for both BL1 and BL31 images.
*/
#if (defined(IMAGE_BL1) || defined(IMAGE_BL31)) && DEBUG
# define REPORT_ERRATA 1
#else
# define REPORT_ERRATA 0
#endif
/*
* Define the offsets to the fields in cpu_ops structure.
*/
.struct 0
CPU_MIDR: /* cpu_ops midr */
.space 8
/* Reset fn is needed in BL at reset vector */
#if defined(IMAGE_AT_EL3)
CPU_RESET_FUNC: /* cpu_ops reset_func */
.space 8
#endif
CPU_EXTRA1_FUNC:
.space 8
#ifdef IMAGE_BL31 /* The power down core and cluster is needed only in BL31 */
CPU_PWR_DWN_OPS: /* cpu_ops power down functions */
.space (8 * CPU_MAX_PWR_DWN_OPS)
#endif
/*
* Fields required to print errata status. Only in BL31 that the printing
* require mutual exclusion and printed flag.
*/
#if REPORT_ERRATA
CPU_ERRATA_FUNC:
.space 8
#if defined(IMAGE_BL31)
CPU_ERRATA_LOCK:
.space 8
CPU_ERRATA_PRINTED:
.space 8
#endif
#endif
#if defined(IMAGE_BL31) && CRASH_REPORTING
CPU_REG_DUMP: /* cpu specific register dump for crash reporting */
.space 8
#endif
CPU_OPS_SIZE = .
/*
* Write given expressions as quad words
*
* _count:
* Write at least _count quad words. If the given number of
* expressions is less than _count, repeat the last expression to
* fill _count quad words in total
* _rest:
* Optional list of expressions. _this is for parameter extraction
* only, and has no significance to the caller
*
* Invoked as:
* fill_constants 2, foo, bar, blah, ...
*/
.macro fill_constants _count:req, _this, _rest:vararg
.ifgt \_count
/* Write the current expression */
.ifb \_this
.error "Nothing to fill"
.endif
.quad \_this
/* Invoke recursively for remaining expressions */
.ifnb \_rest
fill_constants \_count-1, \_rest
.else
fill_constants \_count-1, \_this
.endif
.endif
.endm
/*
* Declare CPU operations
*
* _name:
* Name of the CPU for which operations are being specified
* _midr:
* Numeric value expected to read from CPU's MIDR
* _resetfunc:
* Reset function for the CPU. If there's no CPU reset function,
* specify CPU_NO_RESET_FUNC
* _extra1:
* This is a placeholder for future per CPU operations. Currently,
* some CPUs use this entry to set a test function to determine if
* the workaround for CVE-2017-5715 needs to be applied or not.
* _power_down_ops:
* Comma-separated list of functions to perform power-down
* operatios on the CPU. At least one, and up to
* CPU_MAX_PWR_DWN_OPS number of functions may be specified.
* Starting at power level 0, these functions shall handle power
* down at subsequent power levels. If there aren't exactly
* CPU_MAX_PWR_DWN_OPS functions, the last specified one will be
* used to handle power down at subsequent levels
*/
.macro declare_cpu_ops_base _name:req, _midr:req, _resetfunc:req, \
_extra1:req, _power_down_ops:vararg
.section cpu_ops, "a"
.align 3
.type cpu_ops_\_name, %object
.quad \_midr
#if defined(IMAGE_AT_EL3)
.quad \_resetfunc
#endif
.quad \_extra1
#ifdef IMAGE_BL31
1:
/* Insert list of functions */
fill_constants CPU_MAX_PWR_DWN_OPS, \_power_down_ops
2:
/*
* Error if no or more than CPU_MAX_PWR_DWN_OPS were specified in the
* list
*/
.ifeq 2b - 1b
.error "At least one power down function must be specified"
.else
.iflt 2b - 1b - (CPU_MAX_PWR_DWN_OPS * CPU_WORD_SIZE)
.error "More than CPU_MAX_PWR_DWN_OPS functions specified"
.endif
.endif
#endif
#if REPORT_ERRATA
.ifndef \_name\()_cpu_str
/*
* Place errata reported flag, and the spinlock to arbitrate access to
* it in the data section.
*/
.pushsection .data
define_asm_spinlock \_name\()_errata_lock
\_name\()_errata_reported:
.word 0
.popsection
/* Place CPU string in rodata */
.pushsection .rodata
\_name\()_cpu_str:
.asciz "\_name"
.popsection
.endif
/*
* Weakly-bound, optional errata status printing function for CPUs of
* this class.
*/
.weak \_name\()_errata_report
.quad \_name\()_errata_report
#ifdef IMAGE_BL31
/* Pointers to errata lock and reported flag */
.quad \_name\()_errata_lock
.quad \_name\()_errata_reported
#endif
#endif
#if defined(IMAGE_BL31) && CRASH_REPORTING
.quad \_name\()_cpu_reg_dump
#endif
.endm
.macro declare_cpu_ops _name:req, _midr:req, _resetfunc:req, \
_power_down_ops:vararg
declare_cpu_ops_base \_name, \_midr, \_resetfunc, 0, \
\_power_down_ops
.endm
.macro declare_cpu_ops_workaround_cve_2017_5715 _name:req, _midr:req, \
_resetfunc:req, _extra1:req, _power_down_ops:vararg
declare_cpu_ops_base \_name, \_midr, \_resetfunc, \
\_extra1, \_power_down_ops
.endm
#if REPORT_ERRATA
/*
* Print status of a CPU errata
*
* _chosen:
* Identifier indicating whether or not a CPU errata has been
* compiled in.
* _cpu:
* Name of the CPU
* _id:
* Errata identifier
* _rev_var:
* Register containing the combined value CPU revision and variant
* - typically the return value of cpu_get_rev_var
*/
.macro report_errata _chosen, _cpu, _id, _rev_var=x8
/* Stash a string with errata ID */
.pushsection .rodata
\_cpu\()_errata_\_id\()_str:
.asciz "\_id"
.popsection
/* Check whether errata applies */
mov x0, \_rev_var
bl check_errata_\_id
.ifeq \_chosen
/*
* Errata workaround has not been compiled in. If the errata would have
* applied had it been compiled in, print its status as missing.
*/
cbz x0, 900f
mov x0, #ERRATA_MISSING
.endif
900:
adr x1, \_cpu\()_cpu_str
adr x2, \_cpu\()_errata_\_id\()_str
bl errata_print_msg
.endm
#endif
#endif /* __CPU_MACROS_S__ */
/*
* This macro is used on some CPUs to detect if they are vulnerable
* to CVE-2017-5715.
*/
.macro cpu_check_csv2 _reg _label
mrs \_reg, id_aa64pfr0_el1
ubfx \_reg, \_reg, #ID_AA64PFR0_CSV2_SHIFT, #ID_AA64PFR0_CSV2_LENGTH
/*
* If the field equals to 1 then branch targets trained in one
* context cannot affect speculative execution in a different context.
*/
cmp \_reg, #1
beq \_label
.endm