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Степанов Платон
2026-02-15 16:14:57 +04:00
parent c94866f688
commit 2c70ec98d8
6 changed files with 197 additions and 20 deletions
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73
src/kernel.h
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@@ -75,6 +75,79 @@ struct process *idle_proc;
#define PAGE_X (1 << 3)
#define PAGE_U (1 << 4)
// ===== Disk I/O =====
#define SECTOR_SIZE 512
#define VIRTQ_ENTRY_NUM 16
#define VIRTIO_DEVICE_BLK 2
#define VIRTIO_BLK_PADDR 0x10001000
#define VIRTIO_REG_MAGIC 0x00
#define VIRTIO_REG_VERSION 0x04
#define VIRTIO_REG_DEVICE_ID 0x08
#define VIRTIO_REG_QUEUE_SEL 0x30
#define VIRTIO_REG_QUEUE_NUM_MAX 0x34
#define VIRTIO_REG_QUEUE_NUM 0x38
#define VIRTIO_REG_QUEUE_ALIGN 0x3c
#define VIRTIO_REG_QUEUE_PFN 0x40
#define VIRTIO_REG_QUEUE_READY 0x44
#define VIRTIO_REG_QUEUE_NOTIFY 0x50
#define VIRTIO_REG_DEVICE_STATUS 0x70
#define VIRTIO_REG_DEVICE_CONFIG 0x100
#define VIRTIO_STATUS_ACK 1
#define VIRTIO_STATUS_DRIVER 2
#define VIRTIO_STATUS_DRIVER_OK 4
#define VIRTIO_STATUS_FEAT_OK 8
#define VIRTQ_DESC_F_NEXT 1
#define VIRTQ_DESC_F_WRITE 2
#define VIRTQ_AVAIL_F_NO_INTERRUPT 1
#define VIRTIO_BLK_T_IN 0
#define VIRTIO_BLK_T_OUT 1
struct virtq_desc {
uint64_t addr;
uint32_t len;
uint16_t flags;
uint16_t next;
} __attribute__((packed));
struct virtq_avail {
uint16_t flags;
uint16_t index;
uint16_t ring[VIRTQ_ENTRY_NUM];
} __attribute__((packed));
struct virtq_used_elem {
uint32_t id;
uint32_t len;
} __attribute__((packed));
struct virtq_used {
uint16_t flags;
uint16_t index;
struct virtq_used_elem ring[VIRTQ_ENTRY_NUM];
} __attribute__((packed));
struct virtio_virtq {
struct virtq_desc descs[VIRTQ_ENTRY_NUM];
struct virtq_avail avail;
struct virtq_used used __attribute__((aligned(PAGE_SIZE)));
int queue_index;
volatile uint16_t *used_index;
uint16_t last_used_index;
} __attribute__((packed));
struct virtio_blk_req {
uint32_t type;
uint32_t reserved;
uint64_t sector;
uint8_t data[512];
uint8_t status;
} __attribute__((packed));
struct virtio_virtq *blk_request_vq;
struct virtio_blk_req *blk_req;
paddr_t blk_req_paddr;
unsigned blk_capacity;
// ===== Macros =====
#define READ_CSR(reg) \
({ \