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physmem.c: improved correctness and efficiency of alignment
- physmem.c (align_brk): don't waste memory if already aligned - physmem.c (ALIGN, calloc_phys_vec): align by DMA transfer size - physmem.c (calloc_phys_vec): make sure allocations don't straddle page boundaries - physmem.c (xlat_one): print "unsigned long" with %lx, not %x
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@ -28,19 +28,24 @@
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#define PM_SWAPPED 62
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#define PM_SWAPPED 62
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#define PM_PRESENT 63
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#define PM_PRESENT 63
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#define ALIGN 32 /* DMA transfer size */
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static void align_brk(int alignment)
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static void align_brk(int alignment)
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{
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{
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unsigned long addr;
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unsigned long addr, remainder;
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addr = (unsigned long) sbrk(0);
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addr = (unsigned long) sbrk(0);
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sbrk(alignment-(addr % alignment));
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remainder = addr % alignment;
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if (remainder)
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sbrk(alignment-remainder);
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}
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}
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void **calloc_phys_vec(size_t n, size_t size)
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void **calloc_phys_vec(size_t n, size_t size)
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{
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{
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void **vec;
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void **vec;
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unsigned long pos;
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int i;
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int i;
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vec = malloc(sizeof(void *)*n);
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vec = malloc(sizeof(void *)*n);
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@ -50,7 +55,10 @@ void **calloc_phys_vec(size_t n, size_t size)
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}
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}
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for (i = 0; i != n; i++) {
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for (i = 0; i != n; i++) {
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align_brk(512); /* crude page alignment */
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align_brk(ALIGN);
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pos = (unsigned long) sbrk(0);
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if ((pos & ~(PAGE_SIZE-1)) != ((pos+size) & ~(PAGE_SIZE-1)))
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sbrk(PAGE_SIZE-(pos & (PAGE_SIZE-1)));
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vec[i] = sbrk(size);
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vec[i] = sbrk(size);
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memset(vec[i], 0, size);
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memset(vec[i], 0, size);
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}
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}
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@ -94,7 +102,7 @@ static unsigned long xlat_one(int fd, unsigned long vaddr)
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abort();
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abort();
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}
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}
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paddr = ((map & 0x7fffffffffffffULL) << pshift) | offset;
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paddr = ((map & 0x7fffffffffffffULL) << pshift) | offset;
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// fprintf(stderr, "0x%x -> 0x%x\n", vaddr, paddr);
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// fprintf(stderr, "0x%lx -> 0x%lx\n", vaddr, paddr);
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return paddr;
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return paddr;
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}
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}
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