xnu-7195.101.1.tar.gz

[apple/xnu.git] / pexpert / i386 / pe_init.c

diff --git a/pexpert/i386/pe_init.c b/pexpert/i386/pe_init.c
index 39fd0c02db65c980d9141c4cb6a9bdfec0bcab99..74c6c6276bbba305a49e3839197501784e9e8cfb 100644 (file)
--- a/pexpert/i386/pe_init.c
+++ b/pexpert/i386/pe_init.c
@@ -1,38 +1,39 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_OSREFERENCE_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.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  *
  *

- * Please obtain a copy of the License at 
- * http://www.opensource.apple.com/apsl/ and read it before using this 
- * file.
+ * 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.

  *
  *

- * 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 
+ * 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.
  *
  * limitations under the License.
  *

- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*
  * file: pe_init.c
  *    i386 platform expert initialization.
  */
  */
 /*
  * file: pe_init.c
  *    i386 platform expert initialization.
  */

+
+#include <console/video_console.h>

 #include <sys/types.h>
 #include <mach/vm_param.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/protos.h>
 #include <pexpert/pexpert.h>
 #include <pexpert/boot.h>


@@ -41,262 +42,424 @@
 #include <kern/sched_prim.h>
 #include <kern/debug.h>
 
 #include <kern/sched_prim.h>
 #include <kern/debug.h>
 

-#include "fakePPCStructs.h"
-#include "fakePPCDeviceTree.h"
+#if CONFIG_CSR
+#include <sys/csr.h>
+#endif
+

 #include "boot_images.h"
 
 /* extern references */
 extern void pe_identify_machine(void * args);
 #include "boot_images.h"
 
 /* extern references */
 extern void pe_identify_machine(void * args);

-extern void initialize_screen(void *, unsigned int);
-
+extern int kdb_printf(const char *format, ...) __printflike(1, 2);

 /* private globals */
 PE_state_t  PE_state;
 /* private globals */
 PE_state_t  PE_state;

-dt_data     gMemoryMapNode;
-dt_data     gDriversProp;
-dt_data     gRootpathProp;
-dt_data     gCompatibleProp;

 
 /* Clock Frequency Info */
 clock_frequency_info_t gPEClockFrequencyInfo;
 
 
 /* Clock Frequency Info */
 clock_frequency_info_t gPEClockFrequencyInfo;
 

-void *gPEEFISystemTable     = 0;
-void *gPEEFIRuntimeServices = 0;
+void *gPEEFISystemTable;
+void *gPEEFIRuntimeServices;

 
 

-int PE_initialize_console( PE_Video * info, int op )
+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;
-    Boot_Video   bootInfo;
-    Boot_Video * bInfo;
-
-    /*
-     * Refuse changes from outside pexpert.
-     * The video mode setup by the booter cannot be changed.
-     */
-    if ( info )
-    {
-        bootInfo.v_baseAddr = info->v_baseAddr;
-        bootInfo.v_rowBytes     = info->v_rowBytes;
-        bootInfo.v_width     = info->v_width;
-        bootInfo.v_height    = info->v_height;
-        bootInfo.v_depth     = info->v_depth;
-        bInfo = &bootInfo;
-        if (info == &PE_state.video) {
-            bootInfo.v_display   = info->v_display;
-        } else {
-            bootInfo.v_display  = GRAPHICS_MODE;
-        }
-    }
-    else
-        bInfo = 0;
-
-    switch ( op ) {
-
-        case kPEDisableScreen:
-            initialize_screen((void *) bInfo, op);
-            kprintf("kPEDisableScreen %d\n", last_console);
-           if (!console_is_serial())
-               last_console = switch_to_serial_console();
-            break;
-
-        case kPEEnableScreen:
-            initialize_screen((void *) bInfo, op);
-            kprintf("kPEEnableScreen %d\n", last_console);
-            if( last_console != -1)
-                switch_to_old_console( last_console);
-            break;
-       
-        default:
-            initialize_screen((void *) bInfo, op);
-            break;
-    }
-
-    return 0;
+       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)
+void
+PE_init_iokit(void)

 {
 {

-    enum { kMaxBootVar = 128 };
-        
-    typedef struct {
-        char            name[32];
-        unsigned long   length;
-        unsigned long   value[2];
-    } DriversPackageProp;
-
-    boolean_t bootClutInitialized = FALSE;
-    boolean_t norootInitialized = FALSE;
-    DTEntry             entry;
-    int                        size;
-    void **            map;
-
-    PE_init_kprintf(TRUE);
-    PE_init_printf(TRUE);
-
-    kprintf("Kernel boot args: '%s'\n", PE_boot_args());
-
-    /*
-     * Fetch the CLUT and the noroot image.
-     */
-       boot_progress_element * bootPict;
-
-    if( kSuccess == DTLookupEntry(0, "/chosen/memory-map", &entry)) {
-       if( kSuccess == DTGetProperty(entry, "BootCLUT", (void **) &map, &size)) {
-           bcopy( map[0], appleClut8, sizeof(appleClut8) );
-            bootClutInitialized = TRUE;
-        }
-
-       if( kSuccess == DTGetProperty(entry, "Pict-FailedBoot", (void **) &map, &size)) {
-           bootPict = (boot_progress_element *) 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];
-            norootInitialized = TRUE;
+       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 (!bootClutInitialized) {
-    bcopy( (void *) (uintptr_t) bootClut, (void *) appleClut8, sizeof(appleClut8) );
-    }
-
-    if (!norootInitialized) {
-    default_noroot.width  = kFailedBootWidth;
-    default_noroot.height = kFailedBootHeight;
-    default_noroot.dx     = 0;
-    default_noroot.dy     = kFailedBootOffset;
-    default_noroot_data   = failedBootPict;
-    }
-    
-    /*
-     * Initialize the panic UI
-     */
-    panic_ui_initialize( (unsigned char *) appleClut8 );
-
-    /*
-     * Initialize the spinning wheel (progress indicator).
-     */
-    vc_progress_initialize( &default_progress, default_progress_data,
-                            (unsigned char *) appleClut8 );
-
-    (void) StartIOKit( PE_state.deviceTreeHead, PE_state.bootArgs, gPEEFIRuntimeServices, 0);
+
+       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)
+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            = args->deviceTreeP;
-        PE_state.video.v_baseAddr   = args->Video.v_baseAddr;
-        PE_state.video.v_rowBytes   = args->Video.v_rowBytes;
-        PE_state.video.v_width     = args->Video.v_width;
-        PE_state.video.v_height            = args->Video.v_height;
-        PE_state.video.v_depth     = args->Video.v_depth;
-        PE_state.video.v_display    = args->Video.v_display;
-        strcpy( PE_state.video.v_pixelFormat, "PPPPPPPP");
-    }
-
-    if (!vm_initialized) {
-               /* Hack! FIXME.. */ 
-        outb(0x21, 0xff);   /* Maskout all interrupts Pic1 */
-        outb(0xa1, 0xff);   /* Maskout all interrupts Pic2 */
- 
-        if (PE_state.deviceTreeHead) {
-            DTInit(PE_state.deviceTreeHead);
-    }
-
-        pe_identify_machine(args);
-    } else {
-        DTEntry entry;
-        void *ptr;
-        uint32_t size;
-
-        pe_init_debug();
-    }
+       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 )
+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 );
+       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 )
+int
+PE_current_console( PE_Video * info )

 {
 {

-    *info = PE_state.video;
+       *info = PE_state.video;

 
 

-    return (0);
+       return 0;

 }
 
 }
 

-void PE_display_icon( __unused unsigned int flags, __unused const char * name )
+void
+PE_display_icon( __unused unsigned int flags, __unused const char * name )

 {
 {

-    if ( default_noroot_data )
-        vc_display_icon( &default_noroot, default_noroot_data );
+       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");
+       }

 }
 
 }
 

-extern boolean_t PE_get_hotkey( __unused unsigned char key )
+boolean_t
+PE_get_hotkey(__unused unsigned char key)

 {
 {

-    return (FALSE);
+       return FALSE;

 }
 
 static timebase_callback_func gTimebaseCallback;
 
 }
 
 static timebase_callback_func gTimebaseCallback;
 

-void PE_register_timebase_callback(timebase_callback_func callback)
+void
+PE_register_timebase_callback(timebase_callback_func callback)

 {
 {

-    gTimebaseCallback = callback;
-  
-    PE_call_timebase_callback();
+       gTimebaseCallback = callback;
+
+       PE_call_timebase_callback();

 }
 
 }
 

-void PE_call_timebase_callback(void)
+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);
+       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.
  */
 }
 
 /*
  * The default (non-functional) PE_poll_input handler.
  */

-static int
+int

 PE_stub_poll_input(__unused unsigned int options, char * c)
 {
 PE_stub_poll_input(__unused unsigned int options, char * c)
 {

-    *c = 0xff;
-    return 1;  /* 0 for success, 1 for unsupported */
+       *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;

 }
 
 /*
 }
 
 /*

- * Called by the kernel debugger to poll for keyboard input.
- * Keyboard drivers may replace the default stub function
- * with their polled-mode input function.
+ * 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.

  */
  */

-int (*PE_poll_input)(unsigned int options, char * c)
-       = PE_stub_poll_input;
+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;
+}