atag.h File Reference

#include <boot.h>
#include <stdint.h>

Include dependency graph for atag.h:

Data Structures
struct	atag_header_t
struct	atag_mem_t
struct	atag_cmdline_t
struct	atag_initrd2_t

Functions
void	atag_init (atag_header_t *ptr)
const char *	atag_get_cmdline ()
atag_initrd2_t *	atag_get_initrd2_at (uint8_t index)
void	atag_get_boot_info (boot_info_t *info)

Detailed Description

See also

http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html

ARM tags are used to pass information from the bootloader to the kernel. It is kind of legacy now because Linux uses Device Trees, but it is easier to implement in a project like ArvernOS.

Function Documentation

atag_get_boot_info()

void atag_get_boot_info

(

boot_info_t *

info

)

Fills the boot information from the parsed ARM tags.

Parameters

info	the boot information to fill

atag_get_cmdline()

const char * atag_get_cmdline

(

)

Returns the command line found in the ATAGs.

Returns

a string containing the command line found in the ATAGS or NULL

atag_get_initrd2_at()

atag_initrd2_t * atag_get_initrd2_at

(

uint8_t

index

)

Returns the initrd2 entry at a specific index found in the ATAGs.

Parameters

index

the index of the initrd2 entry to retrieve

Returns

the initrd2 entry or NULL if not found (or index is invalid)

atag_init()

void atag_init

(

atag_header_t *

ptr

)

Initializes the ATAGs module, which essentially parses the ATAGs and store information that can be queried later.

Parameters

ptr	a pointer to the first ATAG header