1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #ifndef _MACHINE_PARAM_H_ |
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6 | #define _MACHINE_PARAM_H_ |
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7 | |
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8 | /* |
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9 | * These aren't really machine-dependent for RTEMS..... |
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10 | */ |
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11 | |
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12 | /* |
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13 | #define MACHINE "i386" |
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14 | #define MID_MACHINE MID_I386 |
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15 | */ |
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16 | |
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17 | /* |
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18 | * Round p (pointer or byte index) up to a correctly-aligned value |
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19 | * for all data types (int, long, ...). The result is unsigned int |
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20 | * and must be cast to any desired pointer type. |
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21 | */ |
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22 | #define ALIGNBYTES (sizeof(int) - 1) |
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23 | #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES) |
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24 | |
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25 | #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */ |
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26 | #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */ |
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27 | #define PAGE_MASK (PAGE_SIZE-1) |
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28 | #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) |
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29 | |
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30 | #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) |
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31 | #define PDRSHIFT 22 /* LOG2(NBPDR) */ |
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32 | #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */ |
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33 | |
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34 | #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ |
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35 | #define DEV_BSIZE (1<<DEV_BSHIFT) |
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36 | |
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37 | #define BLKDEV_IOSIZE 2048 |
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38 | #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ |
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39 | |
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40 | #define UPAGES 2 /* pages of u-area */ |
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41 | |
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42 | /* |
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43 | * Constants related to network buffer management. |
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44 | * MCLBYTES must be no larger than CLBYTES (the software page size), and, |
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45 | * on machines that exchange pages of input or output buffers with mbuf |
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46 | * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple |
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47 | * of the hardware page size. |
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48 | */ |
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49 | #ifndef MSIZE |
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50 | #define MSIZE 128 /* size of an mbuf */ |
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51 | #endif /* MSIZE */ |
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52 | |
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53 | #ifndef MCLSHIFT |
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54 | #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ |
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55 | #endif /* MCLSHIFT */ |
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56 | #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ |
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57 | #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ |
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58 | |
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59 | /* |
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60 | * Some macros for units conversion |
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61 | */ |
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62 | |
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63 | /* clicks to bytes */ |
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64 | #define ctob(x) ((x)<<PAGE_SHIFT) |
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65 | |
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66 | /* bytes to clicks */ |
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67 | #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT) |
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68 | |
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69 | /* |
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70 | * btodb() is messy and perhaps slow because `bytes' may be an off_t. We |
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71 | * want to shift an unsigned type to avoid sign extension and we don't |
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72 | * want to widen `bytes' unnecessarily. Assume that the result fits in |
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73 | * a daddr_t. |
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74 | */ |
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75 | #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ |
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76 | (sizeof (bytes) > sizeof(long) \ |
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77 | ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ |
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78 | : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) |
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79 | |
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80 | #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ |
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81 | ((off_t)(db) << DEV_BSHIFT) |
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82 | |
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83 | /* |
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84 | * Mach derived conversion macros |
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85 | */ |
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86 | #define trunc_page(x) ((unsigned)(x) & ~PAGE_MASK) |
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87 | #define round_page(x) ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK) |
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88 | |
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89 | #define atop(x) ((unsigned)(x) >> PAGE_SHIFT) |
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90 | #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT) |
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91 | |
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92 | #endif /* !_MACHINE_PARAM_H_ */ |
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