This is xnu-8019. See this file in:
/*
 * Copyright (c) 2000-2006 Apple Computer, 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
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * file: pe_init.c
 *    i386 platform expert initialization.
 */

#include <console/video_console.h>
#include <sys/types.h>
#include <mach/vm_param.h>
#include <machine/machine_routines.h>
#include <pexpert/protos.h>
#include <pexpert/pexpert.h>
#include <pexpert/boot.h>
#include <pexpert/device_tree.h>
#include <pexpert/pe_images.h>
#include <kern/sched_prim.h>
#include <kern/debug.h>

#if CONFIG_CSR
#include <sys/csr.h>
#endif

#include "boot_images.h"

/* extern references */
extern void pe_identify_machine(void * args);
extern int kdb_printf(const char *format, ...) __printflike(1, 2);
/* private globals */
PE_state_t  PE_state;

/* Clock Frequency Info */
clock_frequency_info_t gPEClockFrequencyInfo;

void *gPEEFISystemTable;
void *gPEEFIRuntimeServices;

static boot_icon_element* norootIcon_lzss;
static const uint8_t*     norootClut_lzss;

int
PE_initialize_console( PE_Video * info, int op )
{
	static int   last_console = -1;

	if (info) {
		info->v_offset  = 0;
		info->v_length  = 0;
		info->v_display = GRAPHICS_MODE;
	}

	switch (op) {
	case kPEDisableScreen:
		initialize_screen(info, op);
		kprintf("kPEDisableScreen %d\n", last_console);
		if (!console_is_serial()) {
			last_console = switch_to_serial_console();
		}
		break;

	case kPEEnableScreen:
		initialize_screen(info, op);
		if (info) {
			PE_state.video = *info;
		}
		kprintf("kPEEnableScreen %d\n", last_console);
		if (last_console != -1) {
			switch_to_old_console( last_console);
		}
		break;

	case kPEBaseAddressChange:
		if (info) {
			PE_state.video = *info;
		}
		OS_FALLTHROUGH;

	default:
		initialize_screen(info, op);
		break;
	}

	return 0;
}

void
PE_init_iokit(void)
{
	enum { kMaxBootVar = 128 };

	boolean_t bootClutInitialized = FALSE;
	boolean_t noroot_rle_Initialized = FALSE;

	DTEntry             entry;
	unsigned int        size;
	uint32_t const      *map;
	boot_progress_element *bootPict;

	norootIcon_lzss = NULL;
	norootClut_lzss = NULL;

	PE_init_printf(TRUE);

	kprintf("Kernel boot args: '%s'\n", PE_boot_args());

	/*
	 * Fetch the CLUT and the noroot image.
	 */

	if (kSuccess == SecureDTLookupEntry(NULL, "/chosen/memory-map", &entry)) {
		if (kSuccess == SecureDTGetProperty(entry, "BootCLUT", (void const **) &map, &size)) {
			if (sizeof(appleClut8) <= map[1]) {
				bcopy((void *)ml_static_ptovirt(map[0]), appleClut8, sizeof(appleClut8));
				bootClutInitialized = TRUE;
			}
		}

		if (kSuccess == SecureDTGetProperty(entry, "Pict-FailedBoot", (void const **) &map, &size)) {
			bootPict = (boot_progress_element *) ml_static_ptovirt(map[0]);
			default_noroot.width  = bootPict->width;
			default_noroot.height = bootPict->height;
			default_noroot.dx     = 0;
			default_noroot.dy     = bootPict->yOffset;
			default_noroot_data   = &bootPict->data[0];
			noroot_rle_Initialized = TRUE;
		}

		if (kSuccess == SecureDTGetProperty(entry, "FailedCLUT", (void const **) &map, &size)) {
			norootClut_lzss = (uint8_t*) ml_static_ptovirt(map[0]);
		}

		if (kSuccess == SecureDTGetProperty(entry, "FailedImage", (void const **) &map, &size)) {
			norootIcon_lzss = (boot_icon_element *) ml_static_ptovirt(map[0]);
			if (norootClut_lzss == NULL) {
				printf("ERROR: No FailedCLUT provided for noroot icon!\n");
			}
		}
	}

	if (!bootClutInitialized) {
		bcopy((void *) (uintptr_t) bootClut, (void *) appleClut8, sizeof(appleClut8));
	}

	if (!noroot_rle_Initialized) {
		default_noroot.width  = kFailedBootWidth;
		default_noroot.height = kFailedBootHeight;
		default_noroot.dx     = 0;
		default_noroot.dy     = kFailedBootOffset;
		default_noroot_data   = failedBootPict;
	}

	/*
	 * Initialize the spinning wheel (progress indicator).
	 */
	vc_progress_initialize(&default_progress,
	    default_progress_data1x,
	    default_progress_data2x,
	    default_progress_data3x,
	    (unsigned char *) appleClut8);

	/*
	 * x86 only minimally enforces lockdown in hardware.  Additionally, some pre-lockdown functionality
	 * such as commpage initialization requires IOKit enumeration of CPUs, which is heavily entangled
	 * with the ACPI stack.  Therefore, we start the IOKit matching process immediately on x86.
	 */
	InitIOKit(PE_state.deviceTreeHead);
	StartIOKitMatching();
}

void
PE_lockdown_iokit(void)
{
	/* Ensure that at least the CPUs have been enumerated before moving forward. */
	ml_wait_max_cpus();
}

void
PE_init_platform(boolean_t vm_initialized, void * _args)
{
	boot_args *args = (boot_args *)_args;

	if (PE_state.initialized == FALSE) {
		PE_state.initialized        = TRUE;

		// New EFI-style
		PE_state.bootArgs           = _args;
		PE_state.deviceTreeHead     = (void *) ml_static_ptovirt(args->deviceTreeP);
		PE_state.deviceTreeSize     = args->deviceTreeLength;
		if (args->Video.v_baseAddr) {
			PE_state.video.v_baseAddr   = args->Video.v_baseAddr;// remains physical address
			PE_state.video.v_rowBytes   = args->Video.v_rowBytes;
			PE_state.video.v_depth      = args->Video.v_depth;
			PE_state.video.v_display    = args->Video.v_display;
			PE_state.video.v_rotate     = args->Video.v_rotate;

			/* EFI doesn't have a good way of describing rotation internally,
			 * so it flips width and height in portrait mode. We flip it back. */
			if (PE_state.video.v_rotate == kDataRotate90 ||
			    PE_state.video.v_rotate == kDataRotate270) {
				PE_state.video.v_width  = args->Video.v_height;
				PE_state.video.v_height = args->Video.v_width;
			} else {
				PE_state.video.v_width  = args->Video.v_width;
				PE_state.video.v_height = args->Video.v_height;
			}

			strlcpy(PE_state.video.v_pixelFormat, "PPPPPPPP",
			    sizeof(PE_state.video.v_pixelFormat));
		} else {
			PE_state.video.v_baseAddr   = args->VideoV1.v_baseAddr;// remains physical address
			PE_state.video.v_rowBytes   = args->VideoV1.v_rowBytes;
			PE_state.video.v_width      = args->VideoV1.v_width;
			PE_state.video.v_height     = args->VideoV1.v_height;
			PE_state.video.v_depth      = args->VideoV1.v_depth;
			PE_state.video.v_display    = args->VideoV1.v_display;
			PE_state.video.v_rotate     = kDataRotate0; /* no room for rotation info */
			strlcpy(PE_state.video.v_pixelFormat, "PPPPPPPP",
			    sizeof(PE_state.video.v_pixelFormat));
		}

#ifdef  kBootArgsFlagHiDPI
		if (args->flags & kBootArgsFlagHiDPI) {
			PE_state.video.v_scale = kPEScaleFactor2x;
		} else {
			PE_state.video.v_scale = kPEScaleFactor1x;
		}
#else
		PE_state.video.v_scale = kPEScaleFactor1x;
#endif
	}

	if (!vm_initialized) {
		if (PE_state.deviceTreeHead) {
			SecureDTInit(PE_state.deviceTreeHead, PE_state.deviceTreeSize);
		}

		pe_identify_machine(args);
		pe_init_debug();
	}
}

void
PE_create_console( void )
{
	if (PE_state.video.v_display == GRAPHICS_MODE) {
		PE_initialize_console( &PE_state.video, kPEGraphicsMode );
	} else {
		PE_initialize_console( &PE_state.video, kPETextMode );
	}
}

int
PE_current_console( PE_Video * info )
{
	*info = PE_state.video;

	return 0;
}

void
PE_display_icon( __unused unsigned int flags, __unused const char * name )
{
	if (norootIcon_lzss && norootClut_lzss) {
		uint32_t width  = norootIcon_lzss->width;
		uint32_t height = norootIcon_lzss->height;
		uint32_t x = ((PE_state.video.v_width  - width) / 2);
		uint32_t y = ((PE_state.video.v_height - height) / 2) + norootIcon_lzss->y_offset_from_center;

		vc_display_lzss_icon(x, y, width, height,
		    &norootIcon_lzss->data[0],
		    norootIcon_lzss->data_size,
		    norootClut_lzss);
	} else if (default_noroot_data) {
		vc_display_icon( &default_noroot, default_noroot_data );
	} else {
		printf("ERROR: No data found for noroot icon!\n");
	}
}

boolean_t
PE_get_hotkey(__unused unsigned char key)
{
	return FALSE;
}

static timebase_callback_func gTimebaseCallback;

void
PE_register_timebase_callback(timebase_callback_func callback)
{
	gTimebaseCallback = callback;

	PE_call_timebase_callback();
}

void
PE_call_timebase_callback(void)
{
	struct timebase_freq_t timebase_freq;
	unsigned long          num, den, cnt;

	num = gPEClockFrequencyInfo.bus_clock_rate_num * gPEClockFrequencyInfo.bus_to_dec_rate_num;
	den = gPEClockFrequencyInfo.bus_clock_rate_den * gPEClockFrequencyInfo.bus_to_dec_rate_den;

	cnt = 2;
	while (cnt <= den) {
		if ((num % cnt) || (den % cnt)) {
			cnt++;
			continue;
		}

		num /= cnt;
		den /= cnt;
	}

	timebase_freq.timebase_num = num;
	timebase_freq.timebase_den = den;

	if (gTimebaseCallback) {
		gTimebaseCallback(&timebase_freq);
	}
}

/*
 * The default (non-functional) PE_poll_input handler.
 */
int
PE_stub_poll_input(__unused unsigned int options, char * c)
{
	*c = 0xff;
	return 1; /* 0 for success, 1 for unsupported */
}

boolean_t
PE_reboot_on_panic(void)
{
	boot_args *args = (boot_args *)PE_state.bootArgs;

	if (args->flags & kBootArgsFlagRebootOnPanic) {
		return TRUE;
	} else {
		return FALSE;
	}
}

void
PE_sync_panic_buffers(void)
{
}

/* rdar://problem/21244753 */
uint32_t
PE_i_can_has_debugger(uint32_t *debug_flags)
{
#if DEVELOPMENT || DEBUG
	if (debug_flags) {
		assert(startup_phase >= STARTUP_SUB_TUNABLES);
	}
#endif

#if CONFIG_CSR
	if (csr_check(CSR_ALLOW_KERNEL_DEBUGGER) != 0) {
		if (debug_flags) {
			*debug_flags = 0;
		}
		return FALSE;
	}
#endif
	if (debug_flags) {
		*debug_flags = debug_boot_arg;
	}
	return TRUE;
}

uint32_t
PE_get_offset_into_panic_region(char *location)
{
	assert(panic_info != NULL);
	assert(location > (char *) panic_info);

	return (uint32_t) (location - (char *) panic_info);
}

void
PE_init_panicheader()
{
	bzero(panic_info, offsetof(struct macos_panic_header, mph_data));
	panic_info->mph_panic_log_offset = PE_get_offset_into_panic_region(debug_buf_base);

	panic_info->mph_magic = MACOS_PANIC_MAGIC;
	panic_info->mph_version = MACOS_PANIC_HEADER_CURRENT_VERSION;

	return;
}

/*
 * Tries to update the panic header to keep it consistent on nested panics.
 *
 * NOTE: The purpose of this function is NOT to detect/correct corruption in the panic region,
 *       it is to update the panic header to make it consistent when we nest panics.
 *
 * We try to avoid nested panics/asserts on x86 because they are difficult to debug, so log any
 * inconsistencies we find.
 */
void
PE_update_panicheader_nestedpanic()
{
	/* If the panic log offset is not set, re-init the panic header */
	if (panic_info->mph_panic_log_offset == 0) {
		PE_init_panicheader();
		panic_info->mph_panic_flags |= MACOS_PANIC_HEADER_FLAG_NESTED_PANIC;
		return;
	}

	panic_info->mph_panic_flags |= MACOS_PANIC_HEADER_FLAG_NESTED_PANIC;

	/* Usually indicative of corruption in the panic region */
	if (!(((panic_info->mph_stackshot_offset == 0) && (panic_info->mph_stackshot_len == 0)) ||
	    ((panic_info->mph_stackshot_offset != 0) && (panic_info->mph_stackshot_len != 0)))) {
		kdb_printf("panic_info contains invalid stackshot metadata: mph_stackshot_offset 0x%x mph_stackshot_len 0x%x\n",
		    panic_info->mph_stackshot_offset, panic_info->mph_stackshot_len);
	}

	/*
	 * macOS panic logs contain nested panic data, if we've already closed the panic log,
	 * begin the other log.
	 */
	if ((panic_info->mph_panic_log_len != 0) && (panic_info->mph_other_log_offset == 0)) {
		panic_info->mph_other_log_offset = PE_get_offset_into_panic_region(debug_buf_ptr);

		/* Usually indicative of corruption in the panic region */
		if (panic_info->mph_other_log_len != 0) {
			kdb_printf("panic_info contains invalid other log metadata (zero offset but non-zero length), length was 0x%x, zeroing value\n",
			    panic_info->mph_other_log_len);
			panic_info->mph_other_log_len = 0;
		}
	}

	return;
}

vm_size_t
PE_init_socd_client(void)
{
	/* not implemented */
	return 0;
}

void
PE_write_socd_client_buffer(__unused vm_offset_t offset, __unused const void *buff, __unused vm_size_t size)
{
	/* not implemented */
}