127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
#include "arena.h"
|
|
#include "sys.h"
|
|
#include "memory.h"
|
|
#include "string.h"
|
|
|
|
/* Arbitrary block size */
|
|
#define ARENA_BLOCK_SIZE 4096
|
|
|
|
/* NOTE: Application will exit if arena fails to reserve or commit initial
|
|
* memory. */
|
|
struct arena arena_alloc(u64 reserve)
|
|
{
|
|
__prof;
|
|
struct arena arena = { 0 };
|
|
|
|
/* Round up to nearest block size */
|
|
u64 block_remainder = reserve % ARENA_BLOCK_SIZE;
|
|
if (block_remainder > 0) {
|
|
reserve += ARENA_BLOCK_SIZE - block_remainder;
|
|
}
|
|
|
|
arena.base = sys_memory_reserve(reserve);
|
|
if (!arena.base) {
|
|
/* Hard fail on memory reserve failure for now */
|
|
sys_panic(STR("Failed to reserve memory"));
|
|
}
|
|
arena.reserved = reserve;
|
|
|
|
/* Commit one block to start with */
|
|
arena.base = sys_memory_commit(arena.base, ARENA_BLOCK_SIZE);
|
|
__profalloc(arena.base, ARENA_BLOCK_SIZE);
|
|
ASAN_POISON(arena.base, ARENA_BLOCK_SIZE);
|
|
if (!arena.base) {
|
|
/* Hard fail on commit failure */
|
|
sys_panic(STR("Failed to commit initial memory block: System may be out of memory"));
|
|
}
|
|
arena.committed = ARENA_BLOCK_SIZE;
|
|
|
|
/* Arena should be 64k aligned */
|
|
ASSERT(((u64)arena.base & 0xFFFF) == 0);
|
|
|
|
return arena;
|
|
}
|
|
|
|
void arena_release(struct arena *arena)
|
|
{
|
|
__prof;
|
|
__proffree(arena->base);
|
|
ASAN_UNPOISON(arena->base, arena->committed);
|
|
sys_memory_release(arena->base);
|
|
}
|
|
|
|
/* NOTE: Application will exit if arena fails to commit memory */
|
|
void *_arena_push_bytes(struct arena *arena, u64 size, u64 align)
|
|
{
|
|
ASSERT(align > 0);
|
|
ASSERT(!arena->readonly);
|
|
|
|
void *start = NULL;
|
|
|
|
/* TODO: Remove this check? (Only here to avoid aligning when size = 0) */
|
|
if (size > 0) {
|
|
u64 aligned_start_pos = (arena->pos + (align - 1));
|
|
aligned_start_pos -= aligned_start_pos % align;
|
|
|
|
u64 new_pos = aligned_start_pos + size;
|
|
if (new_pos > arena->committed) {
|
|
__profscope(_arena_push_bytes_COMMIT);
|
|
/* Commit new block(s) */
|
|
u64 blocks_needed = (new_pos - arena->committed + ARENA_BLOCK_SIZE - 1) / ARENA_BLOCK_SIZE;
|
|
u64 commit_bytes = blocks_needed * ARENA_BLOCK_SIZE;
|
|
u64 new_capacity = arena->committed + commit_bytes;
|
|
if (new_capacity > arena->reserved) {
|
|
/* Hard fail if we overflow reserved memory for now */
|
|
sys_panic(STR("Failed to commit new memory block: Overflow of reserved memory"));
|
|
}
|
|
void *commit_address = arena->base + arena->committed;
|
|
if (!sys_memory_commit(commit_address, commit_bytes)) {
|
|
/* Hard fail on memory allocation failure for now */
|
|
sys_panic(STR("Failed to commit new memory block: System may be out of memory"));
|
|
}
|
|
__proffree(arena->base);
|
|
__profalloc(arena->base, arena->committed + commit_bytes);
|
|
ASAN_POISON(commit_address, commit_bytes);
|
|
arena->committed += commit_bytes;
|
|
}
|
|
start = arena->base + aligned_start_pos;
|
|
arena->pos = new_pos;
|
|
ASAN_UNPOISON(start, (arena->base + arena->pos) - (u8 *)start);
|
|
} else {
|
|
start = arena->base + arena->pos;
|
|
}
|
|
|
|
return start;
|
|
}
|
|
|
|
/* Copies the memory from the source arena into the destination arena,
|
|
* replacing old contents. Destination arena will be expanded if necessary. */
|
|
void arena_copy_replace(struct arena *dest, struct arena *src)
|
|
{
|
|
arena_reset(dest);
|
|
u64 data_size = src->pos;
|
|
u8 *data_src = src->base;
|
|
u8 *data_dest = _arena_push_bytes(dest, data_size, 1);
|
|
MEMCPY(data_dest, data_src, data_size);
|
|
}
|
|
|
|
void arena_decommit_unused_blocks(struct arena *arena)
|
|
{
|
|
ASSERT(!arena->readonly);
|
|
u64 next_block_pos = ARENA_BLOCK_SIZE * ((arena->pos + (ARENA_BLOCK_SIZE - 1)) / ARENA_BLOCK_SIZE);
|
|
if (arena->committed > next_block_pos) {
|
|
u8 *decommit_start = arena->base + next_block_pos;
|
|
u64 decommit_size = (arena->base + arena->committed) - decommit_start;
|
|
sys_memory_decommit(decommit_start, decommit_size);
|
|
arena->committed = next_block_pos;
|
|
}
|
|
}
|
|
|
|
void arena_set_readonly(struct arena *arena)
|
|
{
|
|
sys_memory_set_committed_readonly(arena->base, arena->committed);
|
|
#if RTC
|
|
arena->readonly = true;
|
|
#endif
|
|
}
|