vram_settings.c File Reference

Video RAM dump. More...

#include <ipxe/uaccess.h>
#include <ipxe/settings.h>

Go to the source code of this file.

Macros
#define	VRAM_BASE   0xb8000
	Video RAM base address. More...
#define	VRAM_LEN   ( 80 /* columns */ * 25 /* rows */ * 2 /* bytes per character */ )
	Video RAM length. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static int	vram_fetch (void *data, size_t len)
	Fetch video RAM setting. More...
const struct setting vram_setting	__setting (SETTING_MISC, vram)
	Video RAM setting. More...

Variables
struct builtin_setting vram_builtin_setting	__builtin_setting
	Video RAM built-in setting. More...

Detailed Description

Video RAM dump.

Definition in file vram_settings.c.

Macro Definition Documentation

VRAM_BASE

#define VRAM_BASE   0xb8000

Video RAM base address.

Definition at line 36 of file vram_settings.c.

VRAM_LEN

#define VRAM_LEN   ( 80 /* columns */ * 25 /* rows */ * 2 /* bytes per character */ )

Video RAM length.

Definition at line 39 of file vram_settings.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

vram_fetch()

static int vram_fetch ( void *  data, size_t  len  )

static

Fetch video RAM setting.

Parameters

data	Buffer to fill with setting data
len	Length of buffer

Return values

len	Length of setting data, or negative error

Definition at line 49 of file vram_settings.c.

                                                 {
        userptr_t vram = phys_to_user ( VRAM_BASE );

        /* Copy video RAM */
        if ( len > VRAM_LEN )
                len = VRAM_LEN;
        copy_from_user ( data, vram, 0, len );

        return VRAM_LEN;
}

References copy_from_user(), data, len, phys_to_user(), VRAM_BASE, and VRAM_LEN.

__setting()

const struct setting vram_setting __setting	(	SETTING_MISC	,
		vram
	)

Video RAM setting.

Variable Documentation

__builtin_setting

struct builtin_setting vram_builtin_setting __builtin_setting

Initial value:

= {
        .setting = &vram_setting,
        .fetch = vram_fetch,
}

Video RAM built-in setting.

Definition at line 69 of file vram_settings.c.