Documentation/driver-api/cxl/allocation/dax.rst

Source file repositories/reference/linux-study-clean/Documentation/driver-api/cxl/allocation/dax.rst

File Facts

System
Linux kernel
Corpus path
Documentation/driver-api/cxl/allocation/dax.rst
Extension
.rst
Size
1726 bytes
Lines
61
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

int main() {
      int fd;
      void* mapped_addr;

      /* Open the DAX device */
      fd = open(DEVICE_PATH, O_RDWR);
      if (fd < 0) {
          perror("open");
          return -1;
      }

      /* Map the device into memory */
      mapped_addr = mmap(NULL, DEVICE_SIZE, PROT_READ | PROT_WRITE,
                         MAP_SHARED, fd, 0);
      if (mapped_addr == MAP_FAILED) {
          perror("mmap");
          close(fd);
          return -1;
      }

      printf("Mapped address: %p\n", mapped_addr);

      /* You can now access the device through the mapped address */
      uint64_t* ptr = (uint64_t*)mapped_addr;
      *ptr = 0x1234567890abcdef; // Write a value to the device
      printf("Value at address %p: 0x%016llx\n", ptr, *ptr);

      /* Clean up */
      munmap(mapped_addr, DEVICE_SIZE);
      close(fd);
      return 0;
  }

Annotation

Implementation Notes