tailix/libkernaux
1
0
Fork 0
mirror of https://github.com/tailix/libkernaux.git synced 2024-10-30 11:54:01 -04:00
Code Releases Activity

Use macros in PFA

Browse source
This commit is contained in:
Alex Kotov 2021-12-14 23:50:27 +05:00
parent e79c6bdbf6
commit fa3f8e1aa0
Signed by: kotovalexarian
GPG key ID: 553C0EBBEB5D5F08
1 changed files with 23 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
src/pfa.c
View file

@ -5,6 +5,16 @@
#include <kernaux/pfa.h>
#include <kernaux/stdlib.h>
#define PAGE_INDEX(page_addr) ((page_addr) / KERNAUX_PFA_PAGE_SIZE)
#define FLAG_INDEX_FROM_INDEX(page_index) ((page_index) / 8)
#define FLAG_MASK_FROM_INDEX(page_index) (1 << ((page_index) % 8))
#define FLAG_INDEX_FROM_ADDR(page_addr) \
(FLAG_INDEX_FROM_INDEX(PAGE_INDEX(page_addr)))
#define FLAG_MASK_FROM_ADDR(page_addr) \
(FLAG_MASK_FROM_INDEX(PAGE_INDEX(page_addr)))
static void KernAux_PFA_mark(
KernAux_PFA pfa,
bool status,
@ -22,11 +32,8 @@ bool KernAux_PFA_is_available(const KernAux_PFA pfa, const size_t page_addr)
{
if (page_addr % KERNAUX_PFA_PAGE_SIZE != 0) return false;
const size_t page_index = page_addr / KERNAUX_PFA_PAGE_SIZE;
const size_t flag_index = page_index / 8;
const unsigned char flag_mask = 1 << (page_index % 8);
return pfa->flags[flag_index] & flag_mask;
return pfa->flags[FLAG_INDEX_FROM_ADDR(page_addr)] &
FLAG_MASK_FROM_ADDR(page_addr);
}
void KernAux_PFA_mark_available(
@ -68,13 +75,12 @@ void KernAux_PFA_mark(
const size_t end_index = end / KERNAUX_PFA_PAGE_SIZE;
for (size_t index = start_index; index <= end_index; ++index) {
const size_t flag_index = index / 8;
const unsigned char flag_mask = 1 << (index % 8);
if (status) {
pfa->flags[flag_index] |= flag_mask;
pfa->flags[FLAG_INDEX_FROM_INDEX(index)] |=
FLAG_MASK_FROM_INDEX(index);
} else {
pfa->flags[flag_index] &= ~flag_mask;
pfa->flags[FLAG_INDEX_FROM_INDEX(index)] &=
~FLAG_MASK_FROM_INDEX(index);
}
}
}
@ -95,10 +101,9 @@ size_t KernAux_PFA_alloc_pages(const KernAux_PFA pfa, size_t mem_size)
index < KERNAUX_PFA_PAGES_COUNT_MAX;
++index)
{
const size_t flag_index = index / 8;
const unsigned char flag_mask = 1 << (index % 8);
if (!(pfa->flags[flag_index] & flag_mask)) {
if (!(pfa->flags[FLAG_INDEX_FROM_INDEX(index)] &
FLAG_MASK_FROM_INDEX(index)))
{
start = 0;
continue;
}
@ -107,9 +112,8 @@ size_t KernAux_PFA_alloc_pages(const KernAux_PFA pfa, size_t mem_size)
if (index - start + 1 == pages_count) {
for (; index >= start; --index) {
const size_t flag_index = index / 8;
const unsigned char flag_mask = 1 << (index % 8);
pfa->flags[flag_index] &= ~flag_mask;
pfa->flags[FLAG_INDEX_FROM_INDEX(index)] &=
~FLAG_MASK_FROM_INDEX(index);
}
return start * KERNAUX_PFA_PAGE_SIZE;
}
@ -135,8 +139,7 @@ void KernAux_PFA_free_pages(
const size_t pages_count = mem_size / KERNAUX_PFA_PAGE_SIZE;
for (size_t index = 0; index < pages_count; ++index) {
const size_t flag_index = (start_index + index) / 8;
const unsigned char flag_mask = 1 << ((start_index + index) % 8);
pfa->flags[flag_index] |= flag_mask;
pfa->flags[FLAG_INDEX_FROM_INDEX(start_index + index)] |=
FLAG_MASK_FROM_INDEX(start_index + index);
}
}