Module sizes 

Commonly used sizes.

C headers: include/linux/sizes.h.

The top-level SZ_* constants are usize-typed, for use in kernel page arithmetic and similar CPU-side work.

The SizeConstants trait provides the same constants as associated constants on u32, u64, and usize, for use in device address spaces where the address width depends on the hardware. Device drivers frequently need these constants as u64 (or u32) rather than usize, because device address spaces are sized independently of the CPU pointer width.

The trait is also implemented for Alignment, providing each size as a compile-time validated alignment.

Examples

use kernel::{
    page::PAGE_SIZE,
    sizes::{
        SizeConstants,
        SZ_1M, //
    }, //
};

// Module-level constants continue to work without a type qualifier.
let num_pages_in_1m = SZ_1M / PAGE_SIZE;

// Trait associated constants require a type qualifier.
let heap_size = 14 * u64::SZ_1M;
let small = u32::SZ_4K;

Constants

SZ_1

0x0000_0001.

SZ_2

0x0000_0002.

SZ_4

0x0000_0004.

SZ_8

0x0000_0008.

SZ_1G

0x4000_0000.

SZ_1K

0x0000_0400.

SZ_1M

0x0010_0000.

SZ_2G

0x8000_0000.

SZ_2K

0x0000_0800.

SZ_2M

0x0020_0000.

SZ_4K

0x0000_1000.

SZ_4M

0x0040_0000.

SZ_8K

0x0000_2000.

SZ_8M

0x0080_0000.

SZ_16

0x0000_0010.

SZ_32

0x0000_0020.

SZ_64

0x0000_0040.

SZ_16K

0x0000_4000.

SZ_16M

0x0100_0000.

SZ_32K

0x0000_8000.

SZ_32M

0x0200_0000.

SZ_64K

0x0001_0000.

SZ_64M

0x0400_0000.

SZ_128

0x0000_0080.

SZ_256

0x0000_0100.

SZ_512

0x0000_0200.

SZ_128K

0x0002_0000.

SZ_128M

0x0800_0000.

SZ_256K

0x0004_0000.

SZ_256M

0x1000_0000.

SZ_512K

0x0008_0000.

SZ_512M

0x2000_0000.

Traits

SizeConstants

Size constants for device address spaces.