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Memory fixes userspace

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boreddevnl
2026-02-26 21:09:18 +01:00
parent 786eac0345
commit 2801dbc21f
57 changed files with 215 additions and 183 deletions
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20
src/kernel/fat32.c
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@@ -46,6 +46,8 @@ typedef struct {
uint32_t total_sectors;
uint32_t partition_offset; // LBA offset of partition start
bool mounted;
uint32_t cached_fat_sector;
uint8_t cached_fat_buf[512];
} FAT32_Volume;
static FAT32_Volume volumes[26]; // A-Z
@@ -413,6 +415,7 @@ static bool realfs_mount(char drive) {
volumes[idx].fat_size = bpb->sectors_per_fat_32;
volumes[idx].total_sectors = bpb->total_sectors_32;
volumes[idx].mounted = true;
volumes[idx].cached_fat_sector = 0xFFFFFFFF;
fs_serial_str("[FAT32] mounted drive ");
fs_serial_char(drive);
@@ -456,18 +459,16 @@ static uint32_t realfs_next_cluster(FAT32_Volume *vol, uint32_t cluster) {
uint32_t fat_sector = vol->fat_begin_lba + (cluster * 4) / 512;
uint32_t fat_offset = (cluster * 4) % 512;
uint8_t *buf = (uint8_t*)kmalloc(512);
if (!buf) return 0xFFFFFFFF;
if (vol->disk->read_sector(vol->disk, fat_sector, buf) != 0) {
kfree(buf);
return 0xFFFFFFFF;
if (vol->cached_fat_sector != fat_sector) {
if (vol->disk->read_sector(vol->disk, fat_sector, vol->cached_fat_buf) != 0) {
return 0xFFFFFFFF;
}
vol->cached_fat_sector = fat_sector;
}
uint32_t next = *(uint32_t*)&buf[fat_offset];
uint32_t next = *(uint32_t*)&vol->cached_fat_buf[fat_offset];
next &= 0x0FFFFFFF; // Mask top 4 bits
kfree(buf);
return next;
}
@@ -791,6 +792,9 @@ static uint32_t realfs_allocate_cluster(FAT32_Volume *vol) {
if ((val & 0x0FFFFFFF) == 0) {
*(uint32_t*)&fat_buf[offset] = 0x0FFFFFFF; // EOC
vol->disk->write_sector(vol->disk, sector, fat_buf);
if (vol->cached_fat_sector == sector) {
vol->cached_fat_sector = 0xFFFFFFFF;
}
kfree(fat_buf);
return current;
}