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1 // Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // kernel\eka\include\slab.h |
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15 // |
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16 // |
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17 |
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18 #ifndef __KERNEL_MODE__ |
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19 |
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20 class slab; |
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21 class slabhdr; |
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22 #define MAXSLABSIZE 56 |
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23 #define PAGESHIFT 12 |
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24 #define PAGESIZE (1<<PAGESHIFT) |
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25 #define SLABSHIFT 10 |
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26 #define SLABSIZE (1 << SLABSHIFT) |
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27 #define CELLALIGN 8 |
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28 |
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29 |
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30 const unsigned slabfull = 0; |
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31 const TInt slabsperpage = (int)(PAGESIZE/SLABSIZE); |
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32 #define HIBIT(bits) (((unsigned)bits & 0xc) ? 2 + ((unsigned)bits>>3) : ((unsigned) bits>>1)) |
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33 |
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34 #define LOWBIT(bits) (((unsigned) bits&3) ? 1 - ((unsigned)bits&1) : 3 - (((unsigned)bits>>2)&1)) |
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35 |
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36 #define ZEROBITS(header) (((unsigned)header & 0x70000000) ? 0 : 1) |
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37 |
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38 class slabhdr |
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39 { |
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40 public: |
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41 unsigned iHeader; |
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42 // made up of |
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43 // bits | 31 | 30..28 | 27..18 | 17..12 | 11..8 | 7..0 | |
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44 // +----------+--------+--------+--------+---------+----------+ |
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45 // field | floating | zero | used-4 | size | pagemap | free pos | |
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46 // |
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47 slab** iParent; // reference to iParent's pointer to this slab in tree |
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48 slab* iChild1; // 1st iChild in tree |
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49 slab* iChild2; // 2nd iChild in tree |
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50 }; |
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51 |
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52 const TInt KMaxSlabPayload = SLABSIZE - sizeof(slabhdr); |
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53 #define MAXUSEDM4BITS 0x0fc00000 |
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54 #define FLOATING_BIT 0x80000000 |
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55 |
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56 inline unsigned HeaderFloating(unsigned h) |
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57 {return (h&0x80000000);} |
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58 const unsigned maxuse = (SLABSIZE - sizeof(slabhdr))>>2; |
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59 const unsigned firstpos = sizeof(slabhdr)>>2; |
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60 |
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61 #ifdef _DEBUG |
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62 #define CHECKTREE(x) DoCheckSlabTree(x,EFalse) |
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63 #define CHECKSLAB(s,t,p) DoCheckSlab(s,t,p) |
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64 #define CHECKSLABBFR(s,p) {TUint32 b[4]; BuildPartialSlabBitmap(b,s,p);} |
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65 #else |
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66 #define CHECKTREE(x) (void)0 |
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67 #define CHECKSLAB(s,t,p) (void)0 |
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68 #define CHECKSLABBFR(s,p) (void)0 |
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69 #endif |
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70 |
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71 class slabset |
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72 { |
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73 public: |
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74 slab* iPartial; |
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75 }; |
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76 |
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77 class slab : public slabhdr |
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78 { |
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79 public: |
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80 void Init(unsigned clz); |
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81 //static slab* SlabFor( void* p); |
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82 static slab* SlabFor(const void* p) ; |
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83 unsigned char iPayload[SLABSIZE-sizeof(slabhdr)]; |
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84 }; |
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85 |
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86 class page |
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87 { |
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88 public: |
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89 inline static page* PageFor(slab* s); |
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90 //slab iSlabs; |
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91 slab iSlabs[slabsperpage]; |
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92 }; |
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93 |
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94 |
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95 inline page* page::PageFor(slab* s) |
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96 { |
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97 return reinterpret_cast<page*>((unsigned(s))&~(PAGESIZE-1)); |
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98 } |
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99 |
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100 |
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101 #endif // __KERNEL_MODE__ |