78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
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/*
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* Copyright (c) 2007-2009 Apple Inc. All rights reserved.
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* Copyright (c) 2006 Apple Computer, 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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#if WITH_SYSCFG
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#include <debug.h>
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#include <lib/blockdev.h>
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#include <lib/syscfg.h>
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#include "FPart.h"
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#include "VFLBuffer.h"
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#include "WMRConfig.h"
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#include "WhimoryBoot.h"
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extern uint32_t nand_fsys_block_offset;
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// The syscfg library assumes that syscfg will be 0x4000 bytes into
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// the device regardles of whether it's NAND or NOR. nand1 will ONLY
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// expose syscfg, so this doesn't make any sense, but we'll say we're
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// big enough to read that far in anyway.
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#define kSysCfgActualSize ( 0x4000 )
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#define kFakeBdevBlockSize (kSysCfgBdevOffset)
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#define kFakeBdevCapacity (kSysCfgBdevOffset + kSysCfgActualSize)
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static FPartFunctions *_fpart = NULL;
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int ppn_syscfg_init(void)
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{
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WhimoryBootCode boot_code;
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boot_code = WMR_Start(0, 0, 0);
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if (kWhimoryOk == boot_code) {
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_fpart = WMR_PPN_GetFPart();
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if (NULL != _fpart->ReadSpecialBlock) {
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return 0;
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} else {
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dprintf(DEBUG_CRITICAL, "ppn syscfg is not supported!\n");
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return -1;
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}
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}
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return -1;
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}
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int ppn_read_syscfg_hook(struct blockdev *_dev, void *ptr, block_addr block, size_t count)
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{
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bool ok = true;
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// Only allow reading the "second" block
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if ((block != 1) || (count != 1)) {
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dprintf(DEBUG_CRITICAL, "attempted to read ppn syscfg at non-zero offset\n");
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ok = false;
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} else if (count > 0) {
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if (!_fpart->ReadSpecialBlock(ptr, kFakeBdevBlockSize, AND_SB_TYPE_UNIQUE_INFO)) {
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dprintf(DEBUG_CRITICAL, "ppn_read_syscfg_hook: failure reading syscfg\n");
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ok = false;
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}
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}
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if (!ok)
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return -1;
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return count;
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}
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#endif /* WITH_SYSCFG */
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