ramdisk.c File Reference

RAM disks. More...

#include <gpxe/blockdev.h>
#include <gpxe/ramdisk.h>

Go to the source code of this file.

Functions

FILE_LICENCE (GPL2_OR_LATER)

static __attribute__ ((always_inline))

static int ramdisk_read (struct block_device *blockdev, uint64_t block, unsigned long count, userptr_t buffer)

Read block.

static int ramdisk_write (struct block_device *blockdev, uint64_t block, unsigned long count, userptr_t buffer)

Write block.

int init_ramdisk (struct ramdisk *ramdisk, userptr_t data, size_t len, unsigned int blksize)

Variables

static struct
block_device_operations ramdisk_operations

Detailed Description

RAM disks.

Definition in file ramdisk.c.

Function Documentation

FILE_LICENCE ( GPL2_OR_LATER )

static __attribute__ ( (always_inline) ) [inline, static]

Definition at line 31 of file ramdisk.c.

References container_of.

00032                                                    {
00033         return container_of ( blockdev, struct ramdisk, blockdev );
00034 }

static int ramdisk_read	(	struct block_device *	blockdev,
		uint64_t	block,
		unsigned long	count,
		userptr_t	buffer
	)			`[static]`

Read block.

Parameters:

	blockdev	Block device
	block	Block number
	count	Block count
	buffer	Data buffer

Return values:

rc

Return status code

Definition at line 45 of file ramdisk.c.

References block_device::blksize, ramdisk::data, DBGC, memcpy_user(), and offset.

00046                                                                   {
00047         struct ramdisk *ramdisk = block_to_ramdisk ( blockdev );
00048         unsigned long offset = ( block * blockdev->blksize );
00049         unsigned long length = ( count * blockdev->blksize );
00050 
00051         DBGC ( ramdisk, "RAMDISK %p reading [%lx,%lx)\n",
00052                ramdisk, offset, length );
00053 
00054         memcpy_user ( buffer, 0, ramdisk->data, offset, length );
00055         return 0;
00056 }

static int ramdisk_write	(	struct block_device *	blockdev,
		uint64_t	block,
		unsigned long	count,
		userptr_t	buffer
	)			`[static]`

Write block.

Parameters:

	blockdev	Block device
	block	Block number
	count	Block count
	buffer	Data buffer

Return values:

rc

Return status code

Definition at line 67 of file ramdisk.c.

References block_device::blksize, ramdisk::data, DBGC, memcpy_user(), and offset.

00068                                                                    {
00069         struct ramdisk *ramdisk = block_to_ramdisk ( blockdev );
00070         unsigned long offset = ( block * blockdev->blksize );
00071         unsigned long length = ( count * blockdev->blksize );
00072 
00073         DBGC ( ramdisk, "RAMDISK %p writing [%lx,%lx)\n",
00074                ramdisk, offset, length );
00075 
00076         memcpy_user ( ramdisk->data, offset, buffer, 0, length );
00077         return 0;
00078 }

int init_ramdisk	(	struct ramdisk *	ramdisk,
		userptr_t	data,
		size_t	len,
		unsigned int	blksize
	)

Definition at line 85 of file ramdisk.c.

References block_device::blksize, ramdisk::blockdev, block_device::blocks, ramdisk::data, and block_device::op.

Referenced by eltorito_exec().

00086                                           {
00087         
00088         if ( ! blksize )
00089                 blksize = 512;
00090 
00091         ramdisk->data = data;
00092         ramdisk->blockdev.op = &ramdisk_operations;
00093         ramdisk->blockdev.blksize = blksize;
00094         ramdisk->blockdev.blocks = ( len / blksize );
00095 
00096         return 0;
00097 }

Variable Documentation

struct block_device_operations ramdisk_operations [static]

Initial value:

 {
        .read   = ramdisk_read,
        .write  = ramdisk_write
}

Definition at line 80 of file ramdisk.c.


Functions
	FILE_LICENCE (GPL2_OR_LATER)
static	__attribute__ ((always_inline))
static int	ramdisk_read (struct block_device *blockdev, uint64_t block, unsigned long count, userptr_t buffer)
	Read block.
static int	ramdisk_write (struct block_device *blockdev, uint64_t block, unsigned long count, userptr_t buffer)
	Write block.
int	init_ramdisk (struct ramdisk *ramdisk, userptr_t data, size_t len, unsigned int blksize)
Variables
static struct block_device_operations	ramdisk_operations