diff options
Diffstat (limited to 'kernel/arch/i386/mmu.c')
| -rw-r--r-- | kernel/arch/i386/mmu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/arch/i386/mmu.c b/kernel/arch/i386/mmu.c index 2c05fb6..b9501ff 100644 --- a/kernel/arch/i386/mmu.c +++ b/kernel/arch/i386/mmu.c @@ -117,8 +117,9 @@ void mmu_free_pages(void *a, u32 n) { } } +u32 start_frame_search = 1; u32 first_free_frame(void) { - u32 i = 1; + u32 i = start_frame_search; for (; i < INDEX_FROM_BIT(num_array_frames * 32); i++) { if (tmp_small_frames[i] == 0xFFFFFFFF) { continue; @@ -126,6 +127,7 @@ u32 first_free_frame(void) { for (u32 c = 0; c < 32; c++) { if (!(tmp_small_frames[i] & ((u32)1 << c))) { + start_frame_search = i; return i * 32 + c; } } @@ -142,6 +144,7 @@ void write_to_frame(u32 frame_address, u8 on) { ((u32)0x1 << OFFSET_FROM_BIT(frame)); } else { num_allocated_frames--; + start_frame_search = min(start_frame_search, INDEX_FROM_BIT(frame)); tmp_small_frames[INDEX_FROM_BIT(frame)] &= ~((u32)0x1 << OFFSET_FROM_BIT(frame)); } |