/*
* Copyright (c) 2012-2024 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
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*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <atm/atm_internal.h>
#include <machine/commpage.h>
#include <pexpert/pexpert.h>
#if CONFIG_EXCLAVES
extern kern_return_t exclaves_oslog_set_trace_mode(uint32_t);
#endif // CONFIG_EXCLAVES
/*
* Global that is set by diagnosticd and readable by userspace
* via the commpage.
*/
static uint32_t atm_diagnostic_config;
static bool disable_atm;
/*
* Routine: atm_init
* Purpose: Initialize the atm subsystem.
* Returns: None.
*/
void
atm_init(void)
{
char temp_buf[20];
/* Disable atm if disable_atm present in device-tree properties or in boot-args */
if ((PE_get_default("kern.disable_atm", temp_buf, sizeof(temp_buf))) ||
(PE_parse_boot_argn("-disable_atm", temp_buf, sizeof(temp_buf)))) {
disable_atm = true;
}
if (!PE_parse_boot_argn("atm_diagnostic_config", &atm_diagnostic_config, sizeof(atm_diagnostic_config))) {
if (!PE_get_default("kern.atm_diagnostic_config", &atm_diagnostic_config, sizeof(atm_diagnostic_config))) {
atm_diagnostic_config = 0;
}
}
kprintf("ATM subsystem is initialized\n");
}
/*
* Routine: atm_reset
* Purpose: re-initialize the atm subsystem (e.g. for userspace reboot)
* Returns: None.
*/
void
atm_reset(void)
{
atm_init();
commpage_update_atm_diagnostic_config(atm_diagnostic_config);
#if CONFIG_EXCLAVES
exclaves_oslog_set_trace_mode(atm_diagnostic_config);
#endif // CONFIG_EXCLAVES
}
/*
* Routine: atm_set_diagnostic_config
* Purpose: Set global atm_diagnostic_config and update the commpage to reflect
* the new value.
* Returns: Error if ATM is disabled.
*/
kern_return_t
atm_set_diagnostic_config(uint32_t diagnostic_config)
{
if (disable_atm) {
return KERN_NOT_SUPPORTED;
}
atm_diagnostic_config = diagnostic_config;
commpage_update_atm_diagnostic_config(atm_diagnostic_config);
#if CONFIG_EXCLAVES
return exclaves_oslog_set_trace_mode(diagnostic_config);
#else
return KERN_SUCCESS;
#endif // CONFIG_EXCLAVES
}
/*
* Routine: atm_get_diagnostic_config
* Purpose: Get global atm_diagnostic_config.
* Returns: Diagnostic value
*/
uint32_t
atm_get_diagnostic_config(void)
{
return atm_diagnostic_config;
}