projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| f86df66c | 1 | /* subr_rmap.c 3.2 %G% */ |
| 2694e78a BJ |
2 | |
| 3 | #include "../h/param.h" | |
| 4 | #include "../h/systm.h" | |
| 5 | #include "../h/map.h" | |
| 6 | #include "../h/dir.h" | |
| 7 | #include "../h/user.h" | |
| 8 | #include "../h/proc.h" | |
| 9 | #include "../h/mtpr.h" | |
| 10 | #include "../h/text.h" | |
| 11 | ||
| 12 | /* | |
| 13 | * Allocate 'size' units from the given | |
| 14 | * map. Return the base of the allocated | |
| 15 | * space. | |
| 16 | * In a map, the addresses are increasing and the | |
| 17 | * list is terminated by a 0 size. | |
| 18 | * The swap map unit is 512 bytes. | |
| 19 | * Algorithm is first-fit. | |
| 20 | */ | |
| 21 | malloc(mp, size) | |
| 22 | struct map *mp; | |
| 23 | { | |
| 24 | register int a; | |
| 25 | register struct map *bp; | |
| 26 | ||
| 27 | if (size <= 0) | |
| 28 | panic("malloc"); | |
| 29 | for (bp=mp; bp->m_size; bp++) { | |
| 30 | if (bp->m_size >= size) { | |
| 31 | a = bp->m_addr; | |
| 32 | bp->m_addr += size; | |
| 33 | if ((bp->m_size -= size) == 0) { | |
| 34 | do { | |
| 35 | bp++; | |
| 36 | (bp-1)->m_addr = bp->m_addr; | |
| 37 | } while ((bp-1)->m_size = bp->m_size); | |
| 38 | } | |
| 39 | if (mp == swapmap && a % CLSIZE) | |
| 40 | panic("malloc swapmap"); | |
| 41 | return(a); | |
| 42 | } | |
| 43 | } | |
| 44 | return(0); | |
| 45 | } | |
| 46 | ||
| 47 | /* | |
| 48 | * Free the previously allocated space aa | |
| 49 | * of size units into the specified map. | |
| 50 | * Sort aa into map and combine on | |
| 51 | * one or both ends if possible. | |
| 52 | */ | |
| 53 | mfree(mp, size, a) | |
| 54 | struct map *mp; | |
| 55 | register int size, a; | |
| 56 | { | |
| 57 | register struct map *bp; | |
| 58 | register int t; | |
| 59 | ||
| 60 | if (a <= 0) | |
| 61 | panic("mfree addr"); | |
| 62 | if (size <= 0) | |
| 63 | panic("mfree size"); | |
| 64 | bp = mp; | |
| 65 | for (; bp->m_addr<=a && bp->m_size!=0; bp++) | |
| 66 | continue; | |
| 67 | if (bp>mp && (bp-1)->m_addr+(bp-1)->m_size > a) | |
| 68 | panic("mfree begov"); | |
| 69 | if (a+size > bp->m_addr && bp->m_size) | |
| 70 | panic("mfree endov"); | |
| 71 | if (bp>mp && (bp-1)->m_addr+(bp-1)->m_size == a) { | |
| 72 | (bp-1)->m_size += size; | |
| 73 | if (a+size == bp->m_addr) { | |
| 74 | (bp-1)->m_size += bp->m_size; | |
| 75 | while (bp->m_size) { | |
| 76 | bp++; | |
| 77 | (bp-1)->m_addr = bp->m_addr; | |
| 78 | (bp-1)->m_size = bp->m_size; | |
| 79 | } | |
| 80 | } | |
| 81 | } else { | |
| 82 | if (a+size == bp->m_addr && bp->m_size) { | |
| 83 | bp->m_addr -= size; | |
| 84 | bp->m_size += size; | |
| 85 | } else if (size) { | |
| 86 | do { | |
| 87 | t = bp->m_addr; | |
| 88 | bp->m_addr = a; | |
| 89 | a = t; | |
| 90 | t = bp->m_size; | |
| 91 | bp->m_size = size; | |
| 92 | bp++; | |
| 93 | } while (size = t); | |
| 94 | } | |
| 95 | } | |
| 96 | if ((mp == kernelmap) && kmapwnt) { | |
| 97 | kmapwnt = 0; | |
| 98 | wakeup((caddr_t)kernelmap); | |
| 99 | } | |
| 100 | } |