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libkernaux
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Allow to request any amount of memory in PFA

This commit is contained in:
Alex Kotov 2021-12-14 21:07:01 +05:00
parent e5056680d2
commit d5c683d6ab
Signed by: kotovalexarian
GPG Key ID: 553C0EBBEB5D5F08
2 changed files with 22 additions and 4 deletions
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9
examples/pfa.c
View File

@ -59,5 +59,14 @@ int main()
}
}
// You can also request amounts of memory which are not factors of page
// size.
{
const size_t page_addr = KernAux_PFA_alloc_pages(&pfa, 123);
assert(!KernAux_PFA_is_available(&pfa, page_addr));
KernAux_PFA_free_pages(&pfa, page_addr, 123);
assert(KernAux_PFA_is_available(&pfa, page_addr));
}
return 0;
}

17
src/pfa.c
View File

@ -68,9 +68,13 @@ void KernAux_PFA_mark(
}
}
size_t KernAux_PFA_alloc_pages(const KernAux_PFA pfa, const size_t mem_size)
size_t KernAux_PFA_alloc_pages(const KernAux_PFA pfa, size_t mem_size)
{
if (mem_size % KERNAUX_PFA_PAGE_SIZE != 0) return 0;
const size_t mem_rem = mem_size % KERNAUX_PFA_PAGE_SIZE;
if (mem_rem != 0) {
mem_size = mem_size - mem_rem + KERNAUX_PFA_PAGE_SIZE;
}
const size_t pages_count = mem_size / KERNAUX_PFA_PAGE_SIZE;
@ -101,10 +105,15 @@ size_t KernAux_PFA_alloc_pages(const KernAux_PFA pfa, const size_t mem_size)
void KernAux_PFA_free_pages(
const KernAux_PFA pfa,
const size_t page_addr,
const size_t mem_size
size_t mem_size
) {
if (page_addr % KERNAUX_PFA_PAGE_SIZE != 0) return;
if (mem_size % KERNAUX_PFA_PAGE_SIZE != 0) return;
const size_t mem_rem = mem_size % KERNAUX_PFA_PAGE_SIZE;
if (mem_rem != 0) {
mem_size = mem_size - mem_rem + KERNAUX_PFA_PAGE_SIZE;
}
const size_t start_index = page_addr / KERNAUX_PFA_PAGE_SIZE;
const size_t pages_count = mem_size / KERNAUX_PFA_PAGE_SIZE;