kamkow1/mop3
1
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Working i386 paging and liballoc

Browse Source
This commit is contained in:
Kamil Kowalczyk
2025-12-07 00:53:33 +01:00
commit de5350010b
75 changed files with 6716 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
kernel/libk/bitmap.c Normal file
View File

@@ -0,0 +1,58 @@
/*
Copyright 2025 Kamil Kowalczyk
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <libk/types.h>
#include <libk/bitmap.h>
#include <libk/string.h>
void bitmap_init(struct bitmap *bm, byte_t *baseptr, usize_t bit_count) {
bm->baseptr = baseptr;
bm->bit_count = bit_count;
memset(bm->baseptr, 0, (bit_count + 7) / 8);
}
void bitmap_set(struct bitmap *bm, usize_t k) {
byte_t *byte = (byte_t *)((uptr_t)bm->baseptr + (k / BM_BITS_PER_BYTE));
*byte = (*byte | (1 << (k % BM_BITS_PER_BYTE)));
}
void bitmap_clear(struct bitmap *bm, usize_t k) {
byte_t *byte = (byte_t *)((uptr_t)bm->baseptr + (k / BM_BITS_PER_BYTE));
*byte = (*byte & ~(1 << (k % BM_BITS_PER_BYTE)));
}
bool_t bitmap_test(struct bitmap *bm, usize_t k) {
if (k >= bm->bit_count)
return 0;
byte_t byte = *(byte_t *)((uptr_t)bm->baseptr + (k / BM_BITS_PER_BYTE));
return byte & (1 << (k % BM_BITS_PER_BYTE));
}