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ringbuffer: don't use heap allocator if buffer size is one page

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This commit is contained in:
K. Lange 2021-10-24 19:52:51 +09:00
parent b4783dd1c3
commit f0091f8f87
1 changed files with 11 additions and 2 deletions
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13
kernel/misc/ringbuffer.c
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@ -19,6 +19,7 @@
#include <kernel/string.h>
#include <kernel/vfs.h>
#include <kernel/printf.h>
#include <kernel/mmu.h>
size_t ring_buffer_unread(ring_buffer_t * ring_buffer) {
if (ring_buffer->read_ptr == ring_buffer->write_ptr) {
@ -142,7 +143,11 @@ size_t ring_buffer_write(ring_buffer_t * ring_buffer, size_t size, uint8_t * buf
ring_buffer_t * ring_buffer_create(size_t size) {
ring_buffer_t * out = malloc(sizeof(ring_buffer_t));
out->buffer = malloc(size);
if (size == 4096) {
out->buffer = mmu_map_from_physical(mmu_allocate_a_frame() << 12);
} else {
out->buffer = malloc(size);
}
out->write_ptr = 0;
out->read_ptr = 0;
out->size = size;
@ -160,7 +165,11 @@ ring_buffer_t * ring_buffer_create(size_t size) {
}
void ring_buffer_destroy(ring_buffer_t * ring_buffer) {
free(ring_buffer->buffer);
if (ring_buffer->size == 4096) {
mmu_frame_clear((uintptr_t)ring_buffer->buffer & 0xFFFFFFFFF);
} else {
free(ring_buffer->buffer);
}
wakeup_queue(ring_buffer->wait_queue_writers);
wakeup_queue(ring_buffer->wait_queue_readers);