#include <linux/ctype.h>
#include <linux/errno.h>
#include <linux/bitmap.h>
-#include <asm/bitops.h>
+#include <linux/bitops.h>
#include <asm/uaccess.h>
/*
#define nbits_to_hold_value(val) fls(val)
#define roundup_power2(val,modulus) (((val) + (modulus) - 1) & ~((modulus) - 1))
#define unhex(c) (isdigit(c) ? (c - '0') : (toupper(c) - 'A' + 10))
+#define BASEDEC 10 /* fancier cpuset lists input in decimal */
/**
* bitmap_scnprintf - convert bitmap to an ASCII hex string.
return 0;
}
EXPORT_SYMBOL(bitmap_parse);
+
+/*
+ * bscnl_emit(buf, buflen, rbot, rtop, bp)
+ *
+ * Helper routine for bitmap_scnlistprintf(). Write decimal number
+ * or range to buf, suppressing output past buf+buflen, with optional
+ * comma-prefix. Return len of what would be written to buf, if it
+ * all fit.
+ */
+static inline int bscnl_emit(char *buf, int buflen, int rbot, int rtop, int len)
+{
+ if (len > 0)
+ len += scnprintf(buf + len, buflen - len, ",");
+ if (rbot == rtop)
+ len += scnprintf(buf + len, buflen - len, "%d", rbot);
+ else
+ len += scnprintf(buf + len, buflen - len, "%d-%d", rbot, rtop);
+ return len;
+}
+
+/**
+ * bitmap_scnlistprintf - convert bitmap to list format ASCII string
+ * @buf: byte buffer into which string is placed
+ * @buflen: reserved size of @buf, in bytes
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ *
+ * Output format is a comma-separated list of decimal numbers and
+ * ranges. Consecutively set bits are shown as two hyphen-separated
+ * decimal numbers, the smallest and largest bit numbers set in
+ * the range. Output format is compatible with the format
+ * accepted as input by bitmap_parselist().
+ *
+ * The return value is the number of characters which would be
+ * generated for the given input, excluding the trailing '\0', as
+ * per ISO C99.
+ */
+int bitmap_scnlistprintf(char *buf, unsigned int buflen,
+ const unsigned long *maskp, int nmaskbits)
+{
+ int len = 0;
+ /* current bit is 'cur', most recently seen range is [rbot, rtop] */
+ int cur, rbot, rtop;
+
+ rbot = cur = find_first_bit(maskp, nmaskbits);
+ while (cur < nmaskbits) {
+ rtop = cur;
+ cur = find_next_bit(maskp, nmaskbits, cur+1);
+ if (cur >= nmaskbits || cur > rtop + 1) {
+ len = bscnl_emit(buf, buflen, rbot, rtop, len);
+ rbot = cur;
+ }
+ }
+ return len;
+}
+EXPORT_SYMBOL(bitmap_scnlistprintf);
+
+/**
+ * bitmap_parselist - convert list format ASCII string to bitmap
+ * @buf: read nul-terminated user string from this buffer
+ * @mask: write resulting mask here
+ * @nmaskbits: number of bits in mask to be written
+ *
+ * Input format is a comma-separated list of decimal numbers and
+ * ranges. Consecutively set bits are shown as two hyphen-separated
+ * decimal numbers, the smallest and largest bit numbers set in
+ * the range.
+ *
+ * Returns 0 on success, -errno on invalid input strings:
+ * -EINVAL: second number in range smaller than first
+ * -EINVAL: invalid character in string
+ * -ERANGE: bit number specified too large for mask
+ */
+int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
+{
+ unsigned a, b;
+
+ bitmap_zero(maskp, nmaskbits);
+ do {
+ if (!isdigit(*bp))
+ return -EINVAL;
+ b = a = simple_strtoul(bp, (char **)&bp, BASEDEC);
+ if (*bp == '-') {
+ bp++;
+ if (!isdigit(*bp))
+ return -EINVAL;
+ b = simple_strtoul(bp, (char **)&bp, BASEDEC);
+ }
+ if (!(a <= b))
+ return -EINVAL;
+ if (b >= nmaskbits)
+ return -ERANGE;
+ while (a <= b) {
+ set_bit(a, maskp);
+ a++;
+ }
+ if (*bp == ',')
+ bp++;
+ } while (*bp != '\0' && *bp != '\n');
+ return 0;
+}
+EXPORT_SYMBOL(bitmap_parselist);
+
+/**
+ * bitmap_find_free_region - find a contiguous aligned mem region
+ * @bitmap: an array of unsigned longs corresponding to the bitmap
+ * @bits: number of bits in the bitmap
+ * @order: region size to find (size is actually 1<<order)
+ *
+ * This is used to allocate a memory region from a bitmap. The idea is
+ * that the region has to be 1<<order sized and 1<<order aligned (this
+ * makes the search algorithm much faster).
+ *
+ * The region is marked as set bits in the bitmap if a free one is
+ * found.
+ *
+ * Returns either beginning of region or negative error
+ */
+int bitmap_find_free_region(unsigned long *bitmap, int bits, int order)
+{
+ unsigned long mask;
+ int pages = 1 << order;
+ int i;
+
+ if(pages > BITS_PER_LONG)
+ return -EINVAL;
+
+ /* make a mask of the order */
+ mask = (1ul << (pages - 1));
+ mask += mask - 1;
+
+ /* run up the bitmap pages bits at a time */
+ for (i = 0; i < bits; i += pages) {
+ int index = i/BITS_PER_LONG;
+ int offset = i - (index * BITS_PER_LONG);
+ if((bitmap[index] & (mask << offset)) == 0) {
+ /* set region in bimap */
+ bitmap[index] |= (mask << offset);
+ return i;
+ }
+ }
+ return -ENOMEM;
+}
+EXPORT_SYMBOL(bitmap_find_free_region);
+
+/**
+ * bitmap_release_region - release allocated bitmap region
+ * @bitmap: a pointer to the bitmap
+ * @pos: the beginning of the region
+ * @order: the order of the bits to release (number is 1<<order)
+ *
+ * This is the complement to __bitmap_find_free_region and releases
+ * the found region (by clearing it in the bitmap).
+ */
+void bitmap_release_region(unsigned long *bitmap, int pos, int order)
+{
+ int pages = 1 << order;
+ unsigned long mask = (1ul << (pages - 1));
+ int index = pos/BITS_PER_LONG;
+ int offset = pos - (index * BITS_PER_LONG);
+ mask += mask - 1;
+ bitmap[index] &= ~(mask << offset);
+}
+EXPORT_SYMBOL(bitmap_release_region);
+
+int bitmap_allocate_region(unsigned long *bitmap, int pos, int order)
+{
+ int pages = 1 << order;
+ unsigned long mask = (1ul << (pages - 1));
+ int index = pos/BITS_PER_LONG;
+ int offset = pos - (index * BITS_PER_LONG);
+
+ /* We don't do regions of pages > BITS_PER_LONG. The
+ * algorithm would be a simple look for multiple zeros in the
+ * array, but there's no driver today that needs this. If you
+ * trip this BUG(), you get to code it... */
+ BUG_ON(pages > BITS_PER_LONG);
+ mask += mask - 1;
+ if (bitmap[index] & (mask << offset))
+ return -EBUSY;
+ bitmap[index] |= (mask << offset);
+ return 0;
+}
+EXPORT_SYMBOL(bitmap_allocate_region);
git://git.onelab.eu / linux-2.6.git / blobdiff