diff options
Diffstat (limited to 'device/ramdisk.h')
| -rw-r--r-- | device/ramdisk.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/device/ramdisk.h b/device/ramdisk.h new file mode 100644 index 00000000..3a232460 --- /dev/null +++ b/device/ramdisk.h @@ -0,0 +1,47 @@ +#ifndef _KERN_RAMDISK_H_ +#define _KERN_RAMDISK_H_ + +#include <vm/pmap.h> +#include <device/io_req.h> +#include <device/conf.h> + +/* Maximum number of ramdisk devices */ +#define RAMDISK_MAX 4 + +/* The block size used (userspace requires 512) */ +#define RAMDISK_BLOCKSZ 512 + +/* Name associated to the ramdisk major */ +#define RAMDISK_NAME "rd" +#define RAMDISK_NAMESZ (sizeof RAMDISK_NAME + sizeof (int) * 3 + 1) + +/* Create a new ramdisk of the given size. On success, if out_no and/or out_ptr + * are not NULL, the device number and pointer to the ramdisk's data are stored + * there. Returns D_SUCCESS or D_NO_MEMORY. */ +int ramdisk_create(vm_size_t size, const void *initdata, int *out_no); + +/* Device operations */ +int ramdisk_open(dev_t, int, io_req_t); +int ramdisk_getstat(dev_t, dev_flavor_t, dev_status_t, mach_msg_type_number_t *); +int ramdisk_read(dev_t, io_req_t); +int ramdisk_write(dev_t, io_req_t); +vm_offset_t ramdisk_mmap(dev_t, vm_offset_t, vm_prot_t); + +/* dev_ops initializer to be used from <machine>/conf.c */ +#define RAMDISK_DEV_OPS { \ + .d_name = RAMDISK_NAME, \ + .d_open = ramdisk_open, \ + .d_close = nulldev_close, \ + .d_read = ramdisk_read, \ + .d_write = ramdisk_write, \ + .d_getstat = ramdisk_getstat, \ + .d_setstat = nulldev_setstat, \ + .d_mmap = ramdisk_mmap, \ + .d_async_in = nodev, \ + .d_reset = nulldev, \ + .d_port_death = nulldev_portdeath, \ + .d_subdev = 0, \ + .d_dev_info = nodev, \ + } + +#endif |