/* SPDX-License-Identifier: GPL-2.0 */ /* We need to carefully read the error status, ACK the errors, * prevent recursive traps, and pass the information on to C * code for logging. * * We pass the AFAR in as-is, and we encode the status * information as described in asm-sparc64/sfafsr.h
*/
.type __spitfire_access_error,#function
__spitfire_access_error: /* Disable ESTATE error reporting so that we do not take * recursive traps and RED state the processor.
*/ stxa %g0, [%g0] ASI_ESTATE_ERROR_EN
membar #Sync
mov UDBE_UE, %g1
ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
/* __spitfire_cee_trap branches here with AFSR in %g4 and * UDBE_CE in %g1. It only clears ESTATE_ERR_CE in the ESTATE * Error Enable register.
*/
__spitfire_cee_trap_continue:
ldxa [%g0] ASI_AFAR, %g5 ! Get AFAR
/* Read in the UDB error register state, clearing the sticky * error bits as-needed. We only clear them if the UE bit is * set. Likewise, __spitfire_cee_trap below will only do so * if the CE bit is set. * * NOTE: UltraSparc-I/II have high and low UDB error * registers, corresponding to the two UDB units * present on those chips. UltraSparc-IIi only * has a single UDB, called "SDB" in the manual. * For IIi the upper UDB register always reads * as zero so for our purposes things will just * work with the checks below.
*/
1: ldxa [%g0] ASI_UDBH_ERROR_R, %g3
and %g3, 0x3ff, %g7 ! Paranoia sllx %g7, SFSTAT_UDBH_SHIFT, %g7
or %g4, %g7, %g4
andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
be,pn %xcc, 1f
nop stxa %g3, [%g0] ASI_UDB_ERROR_W
membar #Sync
/* This is the trap handler entry point for ECC correctable * errors. They are corrected, but we listen for the trap so * that the event can be logged. * * Disrupting errors are either: * 1) single-bit ECC errors during UDB reads to system * memory * 2) data parity errors during write-back events * * As far as I can make out from the manual, the CEE trap is * only for correctable errors during memory read accesses by * the front-end of the processor. * * The code below is only for trap level 1 CEE events, as it * is the only situation where we can safely record and log. * For trap level >1 we just clear the CE bit in the AFSR and * return. * * This is just like __spiftire_access_error above, but it * specifically handles correctable errors. If an * uncorrectable error is indicated in the AFSR we will branch * directly above to __spitfire_access_error to handle it * instead. Uncorrectable therefore takes priority over * correctable, and the error logging C code will notice this * case by inspecting the trap type.
*/
.type __spitfire_cee_trap,#function
__spitfire_cee_trap:
ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
mov 1, %g3 sllx %g3, SFAFSR_UE_SHIFT, %g3
andcc %g4, %g3, %g0 ! Check for UE
bne,pn %xcc, __spitfire_access_error
nop
/* Ok, in this case we only have a correctable error. * Indicate we only wish to capture that state in register * %g1, and we only disable CE error reporting unlike UE * handling which disables all errors.
*/
ldxa [%g0] ASI_ESTATE_ERROR_EN, %g3
andn %g3, ESTATE_ERR_CE, %g3 stxa %g3, [%g0] ASI_ESTATE_ERROR_EN
membar #Sync
/* Preserve AFSR in %g4, indicate UDB state to capture in %g1 */
ba,pt %xcc, __spitfire_cee_trap_continue
mov UDBE_CE, %g1
.size __spitfire_cee_trap,.-__spitfire_cee_trap
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