#define SWAP_CAPACITY (150 * 1024 * 1024)
+
+/* This is the first page that linux writes to the swap area */
+/* Taken from Linux */
+union swap_header {
+ struct {
+ char reserved[PAGE_SIZE - 10];
+ char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
+ } magic;
+ struct {
+ char bootbits[1024]; /* Space for disklabel etc. */
+ uint32_t version;
+ uint32_t last_page;
+ uint32_t nr_badpages;
+ unsigned char sws_uuid[16];
+ unsigned char sws_volume[16];
+ uint32_t type; // The index into the swap_map
+ uint32_t padding[116];
+ // uint32_t padding[117];
+ uint32_t badpages[1];
+ } info;
+};
+
struct swap_state {
struct vm_device * blk_dev;
+ uint_t swapped_pages;
+ uint_t unswapped_pages;
+
uint64_t capacity;
uint8_t * swap_space;
addr_t swap_base_addr;
-
};
int offset = lba * HD_SECTOR_SIZE;
int length = sector_count * HD_SECTOR_SIZE;
+
PrintDebug("SymSwap: Reading %d bytes to %p from %p\n", length,
buf, (void *)(swap->swap_space + offset));
+
+ if (length % 4096) {
+ PrintError("Swapping in length that is not a page multiple\n");
+ }
memcpy(buf, swap->swap_space + offset, length);
+ swap->unswapped_pages += (length / 4096);
+
+ PrintDebug("Swapped in %d pages\n", length / 4096);
+
return 0;
}
struct swap_state * swap = (struct swap_state *)(dev->private_data);
int offset = lba * HD_SECTOR_SIZE;
int length = sector_count * HD_SECTOR_SIZE;
+ /*
+ PrintDebug("SymSwap: Writing %d bytes to %p from %p\n", length,
+ (void *)(swap->swap_space + offset), buf);
+ */
+ if (length % 4096) {
+ PrintError("Swapping out length that is not a page multiple\n");
+ }
+
+ if (offset == 0) {
+ // This is the swap header page
+ union swap_header * hdr;
+ if (length != 4096) {
+ PrintError("Initializing Swap space by not writing page multiples. This sucks...\n");
+ return -1;
+ }
+
+ hdr = (union swap_header *)buf;
+
- PrintDebug("SymSwap: Writing %d bytes to %p from %p\n", length,
- (void *)(swap->swap_space + offset), buf);
+ PrintDebug("Swap Type=%d (magic=%s)\n", hdr->info.type, hdr->magic.magic);
+ }
memcpy(swap->swap_space + offset, buf, length);
+ swap->swapped_pages += (length / 4096);
+
+ PrintDebug("Swapped out %d pages\n", length / 4096);
+
return 0;
}
swap->blk_dev = virtio_blk;
swap->capacity = SWAP_CAPACITY;
+ swap->swapped_pages = 0;
+ swap->unswapped_pages = 0;
+
swap->swap_base_addr = (addr_t)V3_AllocPages(swap->capacity / 4096);
swap->swap_space = (uint8_t *)V3_VAddr((void *)(swap->swap_base_addr));
memset(swap->swap_space, 0, SWAP_CAPACITY);