This is xnu-8019. See this file in:
/*
 * Copyright (c) 2007-2021 Apple Inc. All rights reserved.
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 */
#include <pexpert/pexpert.h>
#include <pexpert/boot.h>
#include <pexpert/protos.h>
#include <pexpert/device_tree.h>

#if defined(__arm__)
#include <pexpert/arm/board_config.h>
#elif defined(__arm64__)
#include <pexpert/arm64/board_config.h>
#endif

#include <kern/clock.h>
#include <machine/machine_routines.h>
#if DEVELOPMENT || DEBUG
#include <kern/simple_lock.h>
#include <kern/cpu_number.h>
#endif

#define PANIC_TRACE_LOG 1
#define panic_trace_error(msg, args...) { if (panic_trace_debug == 1) kprintf("panic_trace: " msg "\n", ##args); else if (panic_trace_debug == 2) printf("panic_trace: " msg "\n", ##args); }
#if PANIC_TRACE_LOG
#define panic_trace_log(msg, args...) { if (panic_trace_debug) panic_trace_error(msg, ##args); }
#else
#define panic_trace_log(msg, args...)
#endif /* PANIC_TRACE_LOG */


/* Local declarations */
void pe_identify_machine(boot_args * bootArgs);

/* External declarations */
extern void clean_mmu_dcache(void);
extern void flush_dcache64(addr64_t addr, unsigned count, int phys);

static char    *gPESoCDeviceType;
static char     gPESoCDeviceTypeBuffer[SOC_DEVICE_TYPE_BUFFER_SIZE];
static vm_offset_t gPESoCBasePhys;

static uint32_t pe_arm_init_timer(void *args);

#if DEVELOPMENT || DEBUG
decl_simple_lock_data(, panic_hook_lock);
#endif
/*
 * pe_identify_machine:
 *
 * Sets up platform parameters. Returns:    nothing
 */
void
pe_identify_machine(boot_args * bootArgs)
{
	OpaqueDTEntryIterator iter;
	DTEntry         cpus, cpu;
	void const     *value;
	unsigned int    size;
	int             err;

	(void)bootArgs;

	if (pe_arm_get_soc_base_phys() == 0) {
		return;
	}

	/* Clear the gPEClockFrequencyInfo struct */
	bzero((void *)&gPEClockFrequencyInfo, sizeof(clock_frequency_info_t));

	/* Start with default values. */
	gPEClockFrequencyInfo.timebase_frequency_hz = 24000000;
	gPEClockFrequencyInfo.bus_clock_rate_hz = 100000000;
	gPEClockFrequencyInfo.cpu_clock_rate_hz = 400000000;

	err = SecureDTLookupEntry(NULL, "/cpus", &cpus);
	assert(err == kSuccess);

	err = SecureDTInitEntryIterator(cpus, &iter);
	assert(err == kSuccess);

	while (kSuccess == SecureDTIterateEntries(&iter, &cpu)) {
		if ((kSuccess != SecureDTGetProperty(cpu, "state", &value, &size)) ||
		    (strncmp((char const *)value, "running", size) != 0)) {
			continue;
		}

		/* Find the time base frequency first. */
		if (SecureDTGetProperty(cpu, "timebase-frequency", &value, &size) == kSuccess) {
			/*
			 * timebase_frequency_hz is only 32 bits, and
			 * the device tree should never provide 64
			 * bits so this if should never be taken.
			 */
			if (size == 8) {
				gPEClockFrequencyInfo.timebase_frequency_hz = *(uint64_t const *)value;
			} else {
				gPEClockFrequencyInfo.timebase_frequency_hz = *(uint32_t const *)value;
			}
		}
		gPEClockFrequencyInfo.dec_clock_rate_hz = gPEClockFrequencyInfo.timebase_frequency_hz;

		/* Find the bus frequency next. */
		if (SecureDTGetProperty(cpu, "bus-frequency", &value, &size) == kSuccess) {
			if (size == 8) {
				gPEClockFrequencyInfo.bus_frequency_hz = *(uint64_t const *)value;
			} else {
				gPEClockFrequencyInfo.bus_frequency_hz = *(uint32_t const *)value;
			}
		}
		gPEClockFrequencyInfo.bus_frequency_min_hz = gPEClockFrequencyInfo.bus_frequency_hz;
		gPEClockFrequencyInfo.bus_frequency_max_hz = gPEClockFrequencyInfo.bus_frequency_hz;

		if (gPEClockFrequencyInfo.bus_frequency_hz < 0x100000000ULL) {
			gPEClockFrequencyInfo.bus_clock_rate_hz = gPEClockFrequencyInfo.bus_frequency_hz;
		} else {
			gPEClockFrequencyInfo.bus_clock_rate_hz = 0xFFFFFFFF;
		}

		/* Find the memory frequency next. */
		if (SecureDTGetProperty(cpu, "memory-frequency", &value, &size) == kSuccess) {
			if (size == 8) {
				gPEClockFrequencyInfo.mem_frequency_hz = *(uint64_t const *)value;
			} else {
				gPEClockFrequencyInfo.mem_frequency_hz = *(uint32_t const *)value;
			}
		}
		gPEClockFrequencyInfo.mem_frequency_min_hz = gPEClockFrequencyInfo.mem_frequency_hz;
		gPEClockFrequencyInfo.mem_frequency_max_hz = gPEClockFrequencyInfo.mem_frequency_hz;

		/* Find the peripheral frequency next. */
		if (SecureDTGetProperty(cpu, "peripheral-frequency", &value, &size) == kSuccess) {
			if (size == 8) {
				gPEClockFrequencyInfo.prf_frequency_hz = *(uint64_t const *)value;
			} else {
				gPEClockFrequencyInfo.prf_frequency_hz = *(uint32_t const *)value;
			}
		}
		gPEClockFrequencyInfo.prf_frequency_min_hz = gPEClockFrequencyInfo.prf_frequency_hz;
		gPEClockFrequencyInfo.prf_frequency_max_hz = gPEClockFrequencyInfo.prf_frequency_hz;

		/* Find the fixed frequency next. */
		if (SecureDTGetProperty(cpu, "fixed-frequency", &value, &size) == kSuccess) {
			if (size == 8) {
				gPEClockFrequencyInfo.fix_frequency_hz = *(uint64_t const *)value;
			} else {
				gPEClockFrequencyInfo.fix_frequency_hz = *(uint32_t const *)value;
			}
		}
		/* Find the cpu frequency last. */
		if (SecureDTGetProperty(cpu, "clock-frequency", &value, &size) == kSuccess) {
			if (size == 8) {
				gPEClockFrequencyInfo.cpu_frequency_hz = *(uint64_t const *)value;
			} else {
				gPEClockFrequencyInfo.cpu_frequency_hz = *(uint32_t const *)value;
			}
		}
		gPEClockFrequencyInfo.cpu_frequency_min_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
		gPEClockFrequencyInfo.cpu_frequency_max_hz = gPEClockFrequencyInfo.cpu_frequency_hz;

		if (gPEClockFrequencyInfo.cpu_frequency_hz < 0x100000000ULL) {
			gPEClockFrequencyInfo.cpu_clock_rate_hz = gPEClockFrequencyInfo.cpu_frequency_hz;
		} else {
			gPEClockFrequencyInfo.cpu_clock_rate_hz = 0xFFFFFFFF;
		}
	}

	/* Set the num / den pairs form the hz values. */
	gPEClockFrequencyInfo.bus_clock_rate_num = gPEClockFrequencyInfo.bus_clock_rate_hz;
	gPEClockFrequencyInfo.bus_clock_rate_den = 1;

	gPEClockFrequencyInfo.bus_to_cpu_rate_num =
	    (2 * gPEClockFrequencyInfo.cpu_clock_rate_hz) / gPEClockFrequencyInfo.bus_clock_rate_hz;
	gPEClockFrequencyInfo.bus_to_cpu_rate_den = 2;

	gPEClockFrequencyInfo.bus_to_dec_rate_num = 1;
	gPEClockFrequencyInfo.bus_to_dec_rate_den =
	    gPEClockFrequencyInfo.bus_clock_rate_hz / gPEClockFrequencyInfo.dec_clock_rate_hz;
}

vm_offset_t
pe_arm_get_soc_base_phys(void)
{
	DTEntry         entryP;
	uintptr_t const *ranges_prop;
	uint32_t        prop_size;
	char const      *tmpStr;

	if (SecureDTFindEntry("name", "arm-io", &entryP) == kSuccess) {
		if (gPESoCDeviceType == 0) {
			SecureDTGetProperty(entryP, "device_type", (void const **)&tmpStr, &prop_size);
			strlcpy(gPESoCDeviceTypeBuffer, tmpStr, SOC_DEVICE_TYPE_BUFFER_SIZE);
			gPESoCDeviceType = gPESoCDeviceTypeBuffer;

			SecureDTGetProperty(entryP, "ranges", (void const **)&ranges_prop, &prop_size);
			gPESoCBasePhys = *(ranges_prop + 1);
		}
		return gPESoCBasePhys;
	}
	return 0;
}

extern void     fleh_fiq_generic(void);

#if defined(ARM_BOARD_CLASS_T8002)
extern void     fleh_fiq_t8002(void);
extern uint32_t t8002_get_decrementer(void);
extern void     t8002_set_decrementer(uint32_t);
static struct tbd_ops    t8002_funcs = {&fleh_fiq_t8002, &t8002_get_decrementer, &t8002_set_decrementer};
#endif /* defined(ARM_BOARD_CLASS_T8002) */

vm_offset_t     gPicBase;
vm_offset_t     gTimerBase;
vm_offset_t     gSocPhys;

#if DEVELOPMENT || DEBUG
// This block contains the panic trace implementation
TUNABLE_WRITEABLE(panic_trace_t, panic_trace, "panic_trace", 0);
TUNABLE_WRITEABLE(boolean_t, panic_trace_debug, "panic_trace_debug", 0);
TUNABLE_WRITEABLE(uint64_t, panic_trace_core_cfg, "panic_trace_core_cfg", 0);
TUNABLE_WRITEABLE(uint64_t, panic_trace_ctl, "panic_trace_ctl", 0);
TUNABLE_WRITEABLE(uint64_t, panic_trace_pwr_state_ignore, "panic_trace_pwr_state_ignore", 0);
TUNABLE_WRITEABLE(boolean_t, panic_trace_experimental_hid, "panic_trace_experimental_hid", 0);
TUNABLE(unsigned int, bootarg_stop_clocks, "stop_clocks", 0);
extern unsigned int wfi;

// The command buffer contains the converted commands from the device tree for commanding cpu_halt, enable_trace, etc.
#define DEBUG_COMMAND_BUFFER_SIZE 256
typedef struct command_buffer_element {
	uintptr_t address;
	uintptr_t address_pa;
	uintptr_t value;
	union cpu_selector {
		uint16_t mask;
		struct cpu_range {
			uint8_t min_cpu;
			uint8_t max_cpu;
		} range;
	} destination_cpu_selector;
	uint16_t delay_us;
	bool cpu_selector_is_range;
	bool is_32bit;
} command_buffer_element_t;

#define CPU_SELECTOR_SHIFT              (16)
#define CPU_SELECTOR_MASK               (0xFFFF << CPU_SELECTOR_SHIFT)
#define REGISTER_OFFSET_MASK            ((1 << CPU_SELECTOR_SHIFT) - 1)
#define REGISTER_OFFSET(register_prop)  (register_prop & REGISTER_OFFSET_MASK)
#define CPU_SELECTOR(register_offset)   ((register_offset & CPU_SELECTOR_MASK) >> CPU_SELECTOR_SHIFT) // Upper 16bits holds the cpu selector
#define MAX_WINDOW_SIZE                 0xFFFF
#define DELAY_SHIFT                     (32)
#define DELAY_MASK                      (0xFFFFULL << DELAY_SHIFT)
#define DELAY_US(register_offset)       ((register_offset & DELAY_MASK) >> DELAY_SHIFT)
#define CPU_SELECTOR_ISRANGE_MASK       (1ULL << 62)
#define REGISTER_32BIT_MASK             (1ULL << 63)
#define ALL_CPUS                        0x0000
#define RESET_VIRTUAL_ADDRESS_WINDOW    0xFFFFFFFF

#define REGISTER_IS_32BIT(register_offset)      ((register_offset & REGISTER_32BIT_MASK) != 0)
#define REGISTER_SIZE(register_offset)          (REGISTER_IS_32BIT(register_offset) ? sizeof(uint32_t) : sizeof(uintptr_t))
#define CPU_SELECTOR_IS_RANGE(register_offset)  ((register_offset & CPU_SELECTOR_ISRANGE_MASK) != 0)
#define CPU_SELECTOR_MIN_CPU(register_offset)   ((CPU_SELECTOR(register_offset) & 0xff00) >> 8)
#define CPU_SELECTOR_MAX_CPU(register_offset)   (CPU_SELECTOR(register_offset) & 0x00ff)

// Record which CPU is currently running one of our debug commands, so we can trap panic reentrancy to PE_arm_debug_panic_hook.
static int running_debug_command_on_cpu_number = -1;

// Determine whether the current debug command is intended for this CPU.
static inline bool
is_running_cpu_selected(command_buffer_element_t *command)
{
	assert(running_debug_command_on_cpu_number >= 0);
	if (command->cpu_selector_is_range) {
		return running_debug_command_on_cpu_number >= command->destination_cpu_selector.range.min_cpu
		       && running_debug_command_on_cpu_number <= command->destination_cpu_selector.range.max_cpu;
	} else if (command->destination_cpu_selector.mask == ALL_CPUS) {
		return true;
	} else {
		return !!(command->destination_cpu_selector.mask & (1 << running_debug_command_on_cpu_number));
	}
}


// Pointers into debug_command_buffer for each operation. Assumes runtime will init them to zero.
static command_buffer_element_t *cpu_halt;
static command_buffer_element_t *enable_trace;
static command_buffer_element_t *enable_alt_trace;
static command_buffer_element_t *trace_halt;
static command_buffer_element_t *enable_stop_clocks;
static command_buffer_element_t *stop_clocks;


static void
pe_init_debug_command(DTEntry entryP, command_buffer_element_t **command_buffer, const char* entry_name)
{
	// statically allocate to prevent needing alloc at runtime
	static command_buffer_element_t debug_command_buffer[DEBUG_COMMAND_BUFFER_SIZE];
	static command_buffer_element_t *next_command_buffer_entry = debug_command_buffer;

	// record this pointer but don't assign it to *command_buffer yet, in case we panic while half-initialized
	command_buffer_element_t *command_starting_index = next_command_buffer_entry;

	uintptr_t const *reg_prop;
	uint32_t        prop_size, reg_window_size = 0;
	uintptr_t       base_address_pa = 0, debug_reg_window = 0;

	if (command_buffer == 0) {
		panic_trace_log("%s: %s: no hook to assign this command to\n", __func__, entry_name);
		return;
	}

	if (SecureDTGetProperty(entryP, entry_name, (void const **)&reg_prop, &prop_size) != kSuccess) {
		panic("%s: %s: failed to read property from device tree", __func__, entry_name);
	}

	if (prop_size % (2 * sizeof(*reg_prop))) {
		panic("%s: %s: property size %u bytes is not a multiple of %lu",
		    __func__, entry_name, prop_size, 2 * sizeof(*reg_prop));
	}

	// convert to real virt addresses and stuff commands into debug_command_buffer
	for (; prop_size; reg_prop += 2, prop_size -= 2 * sizeof(*reg_prop)) {
		if (*reg_prop == RESET_VIRTUAL_ADDRESS_WINDOW) {
			debug_reg_window = 0; // Create a new window
		} else if (debug_reg_window == 0) {
			// create a window from virtual address to the specified physical address
			base_address_pa = gSocPhys + *reg_prop;
			reg_window_size = ((uint32_t)*(reg_prop + 1));
			if (reg_window_size > MAX_WINDOW_SIZE) {
				panic("%s: %s: %#x-byte window at #%lx exceeds maximum size of %#x",
				    __func__, entry_name, reg_window_size, base_address_pa, MAX_WINDOW_SIZE );
			}
			debug_reg_window = ml_io_map(base_address_pa, reg_window_size);
			assert(debug_reg_window);
			panic_trace_log("%s: %s: %#x bytes at %#lx mapped to %#lx\n",
			    __func__, entry_name, reg_window_size, base_address_pa, debug_reg_window );
		} else {
			if ((REGISTER_OFFSET(*reg_prop) + REGISTER_SIZE(*reg_prop)) > reg_window_size) {
				panic("%s: %s[%ld]: %#lx(+%lu)-byte offset from %#lx exceeds allocated size of %#x",
				    __func__, entry_name, next_command_buffer_entry - command_starting_index,
				    REGISTER_OFFSET(*reg_prop), REGISTER_SIZE(*reg_prop), base_address_pa, reg_window_size );
			}

			if (next_command_buffer_entry - debug_command_buffer >= DEBUG_COMMAND_BUFFER_SIZE - 1) {
				// can't use the very last entry, since we need it to terminate the command
				panic("%s: %s[%ld]: out of space in command buffer",
				    __func__, entry_name, next_command_buffer_entry - command_starting_index );
			}

			next_command_buffer_entry->address    = debug_reg_window + REGISTER_OFFSET(*reg_prop);
			next_command_buffer_entry->address_pa = base_address_pa  + REGISTER_OFFSET(*reg_prop);
			next_command_buffer_entry->value      = *(reg_prop + 1);
#if defined(__arm64__)
			next_command_buffer_entry->delay_us   = DELAY_US(*reg_prop);
			next_command_buffer_entry->is_32bit   = REGISTER_IS_32BIT(*reg_prop);
#else
			next_command_buffer_entry->delay_us   = 0;
			next_command_buffer_entry->is_32bit   = false;
#endif
			if ((next_command_buffer_entry->cpu_selector_is_range = CPU_SELECTOR_IS_RANGE(*reg_prop))) {
				next_command_buffer_entry->destination_cpu_selector.range.min_cpu = (uint8_t)CPU_SELECTOR_MIN_CPU(*reg_prop);
				next_command_buffer_entry->destination_cpu_selector.range.max_cpu = (uint8_t)CPU_SELECTOR_MAX_CPU(*reg_prop);
			} else {
				next_command_buffer_entry->destination_cpu_selector.mask = (uint16_t)CPU_SELECTOR(*reg_prop);
			}
			next_command_buffer_entry++;
		}
	}

	// null terminate the address field of the command to end it
	(next_command_buffer_entry++)->address = 0;

	// save pointer into table for this command
	*command_buffer = command_starting_index;
}

static void
pe_run_debug_command(command_buffer_element_t *command_buffer)
{
	// When both the CPUs panic, one will get stuck on the lock and the other CPU will be halted when the first executes the debug command
	simple_lock(&panic_hook_lock, LCK_GRP_NULL);

	running_debug_command_on_cpu_number = cpu_number();

	while (command_buffer && command_buffer->address) {
		if (is_running_cpu_selected(command_buffer)) {
			panic_trace_log("%s: cpu %d: reg write 0x%lx (VA 0x%lx):= 0x%lx",
			    __func__, running_debug_command_on_cpu_number, command_buffer->address_pa,
			    command_buffer->address, command_buffer->value);
			if (command_buffer->is_32bit) {
				*((volatile uint32_t*)(command_buffer->address)) = (uint32_t)(command_buffer->value);
			} else {
				*((volatile uintptr_t*)(command_buffer->address)) = command_buffer->value;      // register = value;
			}
			if (command_buffer->delay_us != 0) {
				uint64_t deadline;
				nanoseconds_to_absolutetime(command_buffer->delay_us * NSEC_PER_USEC, &deadline);
				deadline += ml_get_timebase();
				while (ml_get_timebase() < deadline) {
					os_compiler_barrier();
				}
			}
		}
		command_buffer++;
	}

	running_debug_command_on_cpu_number = -1;
	simple_unlock(&panic_hook_lock);
}

void
PE_arm_debug_enable_trace(void)
{
	panic_trace_log("%s enter", __FUNCTION__);
	switch (panic_trace) {
	case panic_trace_enabled:
		pe_run_debug_command(enable_trace);
		break;

	case panic_trace_alt_enabled:
		pe_run_debug_command(enable_alt_trace);
		break;

	default:
		break;
	}
	panic_trace_log("%s exit", __FUNCTION__);
}

static void
PE_arm_panic_hook(const char *str __unused)
{
	(void)str; // not used
	if (bootarg_stop_clocks) {
		pe_run_debug_command(stop_clocks);
	}
	// if panic trace is enabled
	if (panic_trace) {
		if (running_debug_command_on_cpu_number == cpu_number()) {
			// This is going to end badly if we don't trap, since we'd be panic-ing during our own code
			kprintf("## Panic Trace code caused the panic ##\n");
			return;  // allow the normal panic operation to occur.
		}

		// Stop tracing to freeze the buffer and return to normal panic processing.
		pe_run_debug_command(trace_halt);
	}
}

void (*PE_arm_debug_panic_hook)(const char *str) = PE_arm_panic_hook;

void
PE_init_cpu(void)
{
	if (bootarg_stop_clocks) {
		pe_run_debug_command(enable_stop_clocks);
	}

	pe_init_fiq();
}

#else

void(*const PE_arm_debug_panic_hook)(const char *str) = NULL;

void
PE_init_cpu(void)
{
	pe_init_fiq();
}

#endif  // DEVELOPMENT || DEBUG

void
PE_panic_hook(const char *str __unused)
{
	if (PE_arm_debug_panic_hook != NULL) {
		PE_arm_debug_panic_hook(str);
	}
}

void
pe_arm_init_debug(void *args)
{
	DTEntry         entryP;
	uintptr_t const *reg_prop;
	uint32_t        prop_size;

	if (gSocPhys == 0) {
		kprintf("pe_arm_init_debug: failed to initialize gSocPhys == 0\n");
		return;
	}

	if (SecureDTFindEntry("device_type", "cpu-debug-interface", &entryP) == kSuccess) {
		if (args != NULL) {
			if (SecureDTGetProperty(entryP, "reg", (void const **)&reg_prop, &prop_size) == kSuccess) {
				ml_init_arm_debug_interface(args, ml_io_map(gSocPhys + *reg_prop, *(reg_prop + 1)));
			}
#if DEVELOPMENT || DEBUG
			// When args != NULL, this means we're being called from arm_init on the boot CPU.
			// This controls one-time initialization of the Panic Trace infrastructure

			simple_lock_init(&panic_hook_lock, 0); //assuming single threaded mode

			if (panic_trace) {
				kprintf("pe_arm_init_debug: panic_trace=%d\n", panic_trace);

				// Prepare debug command buffers.
				pe_init_debug_command(entryP, &cpu_halt, "cpu_halt");
				pe_init_debug_command(entryP, &enable_trace, "enable_trace");
				pe_init_debug_command(entryP, &enable_alt_trace, "enable_alt_trace");
				pe_init_debug_command(entryP, &trace_halt, "trace_halt");

				// start tracing now
				PE_arm_debug_enable_trace();
			}
			if (bootarg_stop_clocks) {
				pe_init_debug_command(entryP, &enable_stop_clocks, "enable_stop_clocks");
				pe_init_debug_command(entryP, &stop_clocks, "stop_clocks");
			}
#endif
		}
	} else {
		kprintf("pe_arm_init_debug: failed to find cpu-debug-interface\n");
	}
}

static uint32_t
pe_arm_map_interrupt_controller(void)
{
	DTEntry         entryP;
	uintptr_t const *reg_prop;
	uint32_t        prop_size;
	vm_offset_t     soc_phys = 0;

	gSocPhys = pe_arm_get_soc_base_phys();

	soc_phys = gSocPhys;
	kprintf("pe_arm_map_interrupt_controller: soc_phys:  0x%lx\n", (unsigned long)soc_phys);
	if (soc_phys == 0) {
		return 0;
	}

	if (SecureDTFindEntry("interrupt-controller", "master", &entryP) == kSuccess) {
		kprintf("pe_arm_map_interrupt_controller: found interrupt-controller\n");
		SecureDTGetProperty(entryP, "reg", (void const **)&reg_prop, &prop_size);
		gPicBase = ml_io_map(soc_phys + *reg_prop, *(reg_prop + 1));
		kprintf("pe_arm_map_interrupt_controller: gPicBase: 0x%lx\n", (unsigned long)gPicBase);
	}
	if (gPicBase == 0) {
		kprintf("pe_arm_map_interrupt_controller: failed to find the interrupt-controller.\n");
		return 0;
	}

	if (SecureDTFindEntry("device_type", "timer", &entryP) == kSuccess) {
		kprintf("pe_arm_map_interrupt_controller: found timer\n");
		SecureDTGetProperty(entryP, "reg", (void const **)&reg_prop, &prop_size);
		gTimerBase = ml_io_map(soc_phys + *reg_prop, *(reg_prop + 1));
		kprintf("pe_arm_map_interrupt_controller: gTimerBase: 0x%lx\n", (unsigned long)gTimerBase);
	}
	if (gTimerBase == 0) {
		kprintf("pe_arm_map_interrupt_controller: failed to find the timer.\n");
		return 0;
	}

	return 1;
}

uint32_t
pe_arm_init_interrupts(void *args)
{
	kprintf("pe_arm_init_interrupts: args: %p\n", args);

	/* Set up mappings for interrupt controller and possibly timers (if they haven't been set up already) */
	if (args != NULL) {
		if (!pe_arm_map_interrupt_controller()) {
			return 0;
		}
	}

	return pe_arm_init_timer(args);
}

static uint32_t
pe_arm_init_timer(void *args)
{
	vm_offset_t     pic_base = 0;
	vm_offset_t     timer_base = 0;
	vm_offset_t     soc_phys;
	vm_offset_t     eoi_addr = 0;
	uint32_t        eoi_value = 0;
	struct tbd_ops  generic_funcs = {&fleh_fiq_generic, NULL, NULL};
	struct tbd_ops  empty_funcs __unused = {NULL, NULL, NULL};
	tbd_ops_t       tbd_funcs = &generic_funcs;

	/* The SoC headers expect to use pic_base, timer_base, etc... */
	pic_base = gPicBase;
	timer_base = gTimerBase;
	soc_phys = gSocPhys;

#if defined(ARM_BOARD_CLASS_T8002)
	if (!strcmp(gPESoCDeviceType, "t8002-io") ||
	    !strcmp(gPESoCDeviceType, "t8004-io")) {
		/* Enable the Decrementer */
		aic_write32(kAICTmrCnt, 0x7FFFFFFF);
		aic_write32(kAICTmrCfg, kAICTmrCfgEn);
		aic_write32(kAICTmrIntStat, kAICTmrIntStatPct);

		// Enable the WFE Timer
		rPMGR_EVENT_TMR_PERIOD = gPEClockFrequencyInfo.timebase_frequency_hz / USEC_PER_SEC;
		rPMGR_EVENT_TMR = rPMGR_EVENT_TMR_PERIOD;
		rPMGR_EVENT_TMR_CTL = PMGR_EVENT_TMR_CTL_EN;

		eoi_addr = pic_base;
		eoi_value = kAICTmrIntStatPct;
		tbd_funcs = &t8002_funcs;
	} else
#endif /* ARM_BOARD_CLASS_T8002 */
#if defined(__arm64__)
	tbd_funcs = &empty_funcs;
#else
	return 0;
#endif

	if (args != NULL) {
		ml_init_timebase(args, tbd_funcs, eoi_addr, eoi_value);
	}

	return 1;
}