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# Copyright (C) 2014 Apple Inc. All rights reserved.
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#
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# This document is the property of Apple Inc.
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# It is considered confidential and proprietary.
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#
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# This document may not be reproduced or transmitted in any form,
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# in whole or in part, without the express written permission of
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# Apple Inc.
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#
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LIBPANICLOG_DIR := $(GET_LOCAL_DIR)
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LIBPANICLOG_BUILD := $(call TOLIBDIR,$(LIBPANICLOG_DIR)/LIBPANICLOG.a)
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COMMONLIBS += LIBPANICLOG
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# Only process the remainder of the makefile if we are building libraries
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#
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ifeq ($(MAKEPHASE),libraries)
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LIBPANICLOG_OBJS := $(LIBPANICLOG_DIR)/paniclog.o
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LIBPANICLOG_OBJS := $(call TOLIBOBJDIR,$(LIBPANICLOG_OBJS))
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ALL_DEPS += $(LIBPANICLOG_OBJS:%o=%d)
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$(LIBPANICLOG_BUILD): $(LIBPANICLOG_OBJS)
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endif
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/*
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* Copyright (c) 2010, 2013-2015 Apple Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#include <debug.h>
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#include <stdlib.h>
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#include <list.h>
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#include <lib/mib.h>
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#include <platform.h> /* for platform_cache_operation() */
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#include <lib/cksum.h>
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#include <lib/nvram.h>
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#include <lib/blockdev.h>
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/* If the panic ram area is large enough, use copies to improve
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* resilience against errors. */
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#define PANIC_MIN_SIZE_FOR_COPIES (16 * 1024)
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/* The number of copies (including the original) to make of the entire
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* panic log, including headers, if the area is large enough. This
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* provides a minimum of 2664 (after 8->7 bit packing and headers)
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* bytes of contained log data. */
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#define PANIC_COPIES 7
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#define PANIC_BDEV_NAME "paniclog"
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struct vram_panic {
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uint32_t magic;
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uint32_t crc;
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char buf[];
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};
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void clear_panic_region(unsigned char pattern)
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{
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void *panicBufferAddr = (void *)mib_get_addr(kMIBTargetPanicBufferAddress);
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size_t panicBufferSize = mib_get_size(kMIBTargetPanicBufferSize);
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/* clear the panic area to a pattern. values other than 0 useful for debug */
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memset(panicBufferAddr, pattern, panicBufferSize);
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/* ensure this reaches DRAM */
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#if defined(__arm64__)
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/* on coherent archs (H6+), force a cache clean by adding invalidate flag, and specifying address and size */
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platform_cache_operation(CACHE_CLEAN | CACHE_INVALIDATE | CACHE_DRAIN_WRITE_BUFFER, panicBufferAddr, panicBufferSize);
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#else
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platform_cache_operation(CACHE_CLEAN | CACHE_DRAIN_WRITE_BUFFER, NULL, 0);
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#endif
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}
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// arm64 targets only have the new panic log format.
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// armv7? targets may have either.
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int save_panic_log(void)
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{
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struct vram_panic *vpi = NULL;
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void *panic_buf = NULL;
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uint32_t panic_text_len;
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addr_t panicBufferAddr = mib_get_addr(kMIBTargetPanicBufferAddress);
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size_t panicBufferSize = mib_get_size(kMIBTargetPanicBufferSize);
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#if !defined(__arm64__)
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if (mib_get_bool(kMIBTargetWithLegacyPanicLogs)) {
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struct {
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unsigned a:7;
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unsigned b:7;
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unsigned c:7;
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unsigned d:7;
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unsigned e:7;
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unsigned f:7;
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unsigned g:7;
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unsigned h:7;
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} __attribute__((packed)) pack;
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uint32_t panic_size;
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int i, panic_copies;
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if (panicBufferSize >= PANIC_MIN_SIZE_FOR_COPIES) {
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panic_size = panicBufferSize / PANIC_COPIES;
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panic_copies = PANIC_COPIES;
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} else {
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panic_size = panicBufferSize;
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panic_copies = 1;
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}
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panic_text_len = panic_size - 8;
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/* find an intact copy */
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for (i = 0; i < panic_copies; ++i) {
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vpi = (struct vram_panic *) (panicBufferAddr + i * panic_size);
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/* check for magic header */
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if (vpi->magic != 0x4F4F5053 /* 'OOPS' */) {
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continue;
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}
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/* check CRC */
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if (vpi->crc != crc32((unsigned char *) vpi->buf, panic_text_len)) {
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continue;
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}
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/* this copy is very likely intact */
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panic_buf = vpi->buf;
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break;
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}
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/* failed to find an intact copy? */
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if (panic_buf == NULL) {
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/* Don't attempt correction. This method should have
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* been resilient enough that at least one copy
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* survived. Log this CRC error. */
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pack.a = 0x43; /* 'C' */
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pack.b = 0x52; /* 'R' */
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pack.c = 0x43; /* 'C' */
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pack.d = 0x20; /* ' ' */
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pack.e = 0x45; /* 'E' */
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pack.f = 0x52; /* 'R' */
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pack.g = 0x52; /* 'R' */
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pack.h = 0x21; /* '!' */
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panic_buf = &pack;
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panic_text_len = sizeof(pack);
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}
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/* write the panic to the nvram partition */
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if (nvram_set_panic(panic_buf, panic_text_len) < 0) {
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clear_panic_region(0xe1);
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return -1;
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}
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/* wipe the area so we don't produce duplicate logs */
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clear_panic_region(0);
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/* save nvram */
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if (nvram_save() < 0) {
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clear_panic_region(0xe2);
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return -1;
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}
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return 0;
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}
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#endif // !defined(__arm64__)
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int err;
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struct blockdev *dev;
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const char *crc_err = "CRC ERR!";
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ASSERT(!mib_get_bool(kMIBTargetWithLegacyPanicLogs));
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panic_text_len = panicBufferSize - 8;
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vpi = (struct vram_panic *) panicBufferAddr;
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/* check for magic header 'DARN'/'SICK' and CRC value */
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if ((vpi->magic == 0x4441524E || vpi->magic == 0x5349434B) &&
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vpi->crc == crc32((unsigned char *) vpi->buf, panic_text_len)) {
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/* this copy is very likely intact */
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panic_buf = vpi->buf;
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} else {
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/* failed to match DARN magic header or CRC */
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/* Don't attempt correction. Log this CRC error. */
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panic_buf = (void*)crc_err;
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panic_text_len = sizeof(*crc_err);
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}
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dev = lookup_blockdev(PANIC_BDEV_NAME);
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if (!dev) {
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dprintf(DEBUG_CRITICAL, "Couldn't find block device '%s'\n", PANIC_BDEV_NAME);
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clear_panic_region(0xe1);
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return -1;
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}
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err = blockdev_write(dev, (void *)panic_buf, 0, panic_text_len);
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if (err <= 0) {
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dprintf(DEBUG_CRITICAL, "blockdev_write to '%s' device failed with return value %d\n",
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PANIC_BDEV_NAME, err);
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clear_panic_region(0xe2);
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return -1;
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}
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/* wipe the area so we don't produce duplicate logs */
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clear_panic_region(0);
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return 0;
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}
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@@ -0,0 +1,12 @@
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# Copyright (c) 2010, 2014 Apple Inc. All rights reserved.
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#
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# This document is the property of Apple Inc.
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# It is considered confidential and proprietary.
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#
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# This document may not be reproduced or transmitted in any form,
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# in whole or in part, without the express written permission of
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# Apple Inc.
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MODULES += lib/nvram
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LIBRARY_MODULES += lib/paniclog
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