fb.c File Reference

x86: the early console on the boot loader's framebuffer. More...

#include <core/system.h>
#include <core/string.h>
#include <console/earlycon.h>
#include <cpu/io.h>
#include <mm/vm.h>
#include "font.h"

Go to the source code of this file.

Functions
void	earlycon_fb_register (uintptr_t paddr, uint32_t scanline, uint32_t yres, uint32_t xres, uint32_t depth)
	Registers the boot loader's framebuffer, for the early console.
int	earlycon_fb_available (void)
	Says whether the boot loader's framebuffer can be the early console.
static void	earlycon_fb_scroll (int n)
	Scrolls the screen up by n lines of text, clearing the bottom.
static void	fb_putc (int row, int col, char c)
	Draws a character at a row and a column of text.
static int	earlycon_fb_putc (char c)
	Writes a character at the cursor, scrolling when it goes past the last line.
static int	earlycon_fb_puts (char *s)
	Writes a string.
static void	earlycon_fb_init ()
	Maps the framebuffer in the kernel's address space, and sizes the text screen from its resolution.

Variables
static uintptr_t	fb_paddr
static uintptr_t	fb_init = 0
static uint32_t	fb_xres
static uint32_t	fb_yres
static uint32_t	fb_depth
static uint32_t	fb_scanline
static uint32_t	fb_row = 0
static uint32_t	fb_col = 0
static uint32_t	fb_rows = 25
static uint32_t	fb_cols = 80
static uint32_t	fb_size
static struct vm_entry	fb_vmr
static char *	vmem = (char *) ARCH_EARLYFB_BASE
static char *	cursor = (char *) ARCH_EARLYFB_BASE
struct earlycon	earlycon_fb

Detailed Description

x86: the early console on the boot loader's framebuffer.

The boot loader may set up a linear framebuffer (Multiboot's VBE or framebuffer information), which the boot code registers here. Text is drawn with the 8x16 font, in 32-bit pixels only, and the screen scrolls by copying it up a line.

Definition in file fb.c.

Function Documentation

earlycon_fb_available()

int earlycon_fb_available

(

void

)

Says whether the boot loader's framebuffer can be the early console.

Returns

1 if one was registered and has 32 bits per pixel, 0 if not

Definition at line 55 of file fb.c.

References earlycon_fb_available(), fb_depth, fb_paddr, and fb_size.

Referenced by earlycon_fb_available(), and earlycon_reinit().

earlycon_fb_init()

void earlycon_fb_init ( )

static

Maps the framebuffer in the kernel's address space, and sizes the text screen from its resolution.

Definition at line 145 of file fb.c.

References earlycon_fb_init(), fb_cols, fb_init, fb_paddr, fb_rows, fb_size, fb_vmr, fb_xres, fb_yres, vm_entry::flags, kvm_space, vm_entry::paddr, vm_entry::size, VM_KRW, and vm_map().

Referenced by earlycon_fb_init().

earlycon_fb_putc()

int earlycon_fb_putc ( char c )

static

Writes a character at the cursor, scrolling when it goes past the last line.

Returns 1, 0 for a character it can't draw, or -1 before the framebuffer is mapped.

Definition at line 98 of file fb.c.

References earlycon_fb_putc(), earlycon_fb_scroll(), fb_col, fb_cols, fb_init, fb_putc(), fb_row, and fb_rows.

Referenced by earlycon_fb_putc(), and earlycon_fb_puts().

earlycon_fb_puts()

int earlycon_fb_puts ( char * s )

static

Writes a string.

Returns 0.

Definition at line 135 of file fb.c.

References earlycon_fb_putc(), and earlycon_fb_puts().

Referenced by earlycon_fb_puts().

earlycon_fb_register()

void earlycon_fb_register	(	uintptr_t	paddr,
		uint32_t	scanline,
		uint32_t	yres,
		uint32_t	xres,
		uint32_t	depth )

Registers the boot loader's framebuffer, for the early console.

The boot code calls it, before it is mapped.

Parameters

paddr	its physical address
scanline	the size of a line, in bytes
yres	its height, in pixels
xres	its width, in pixels
depth	the bits per pixel

Definition at line 40 of file fb.c.

References earlycon_fb_register(), fb_depth, fb_paddr, fb_scanline, fb_size, fb_xres, fb_yres, and vm_entry::paddr.

Referenced by earlycon_fb_register(), and process_multiboot_info().

earlycon_fb_scroll()

void earlycon_fb_scroll ( int n )

static

Scrolls the screen up by n lines of text, clearing the bottom.

Definition at line 62 of file fb.c.

References earlycon_fb_scroll(), fb_scanline, fb_size, memmove(), memset(), and vm_entry::size.

Referenced by earlycon_fb_putc(), and earlycon_fb_scroll().

fb_putc()

void fb_putc ( int row, int col, char c )

static

Draws a character at a row and a column of text.

Definition at line 70 of file fb.c.

References vm_entry::base, cursor, fb_depth, fb_putc(), fb_scanline, and font_8x16.

Referenced by earlycon_fb_putc(), and fb_putc().

Variable Documentation

cursor

char* cursor = (char *) ARCH_EARLYFB_BASE

static

Definition at line 28 of file fb.c.

Referenced by fb_putc(), and refresh().

earlycon_fb

struct earlycon earlycon_fb

Initial value:

              = {
    .init = earlycon_fb_init,
    .putc = earlycon_fb_putc,
    .puts = earlycon_fb_puts,
}

Definition at line 161 of file fb.c.

Referenced by earlycon_reinit().

fb_col

uint32_t fb_col = 0

static

Definition at line 20 of file fb.c.

Referenced by earlycon_fb_putc().

fb_cols

uint32_t fb_cols = 80

static

Definition at line 21 of file fb.c.

Referenced by earlycon_fb_init(), and earlycon_fb_putc().

fb_depth

uint32_t fb_depth

static

Definition at line 19 of file fb.c.

Referenced by earlycon_fb_available(), earlycon_fb_register(), and fb_putc().

fb_init

uintptr_t fb_init = 0

static

Definition at line 18 of file fb.c.

Referenced by earlycon_fb_init(), and earlycon_fb_putc().

fb_paddr

uintptr_t fb_paddr

static

Definition at line 18 of file fb.c.

Referenced by earlycon_fb_available(), earlycon_fb_init(), and earlycon_fb_register().

fb_row

uint32_t fb_row = 0

static

Definition at line 20 of file fb.c.

Referenced by earlycon_fb_putc().

fb_rows

uint32_t fb_rows = 25

static

Definition at line 21 of file fb.c.

Referenced by earlycon_fb_init(), and earlycon_fb_putc().

fb_scanline

uint32_t fb_scanline

static

Definition at line 20 of file fb.c.

Referenced by earlycon_fb_register(), earlycon_fb_scroll(), and fb_putc().

fb_size

uint32_t fb_size

static

Definition at line 21 of file fb.c.

Referenced by earlycon_fb_available(), earlycon_fb_init(), earlycon_fb_register(), earlycon_fb_scroll(), and fbdev_vesa_map().

fb_vmr

struct vm_entry fb_vmr

static

Initial value:

                     = {
    .base = ARCH_EARLYFB_BASE,
}

Definition at line 23 of file fb.c.

Referenced by earlycon_fb_init().

fb_xres

uint32_t fb_xres

static

Definition at line 19 of file fb.c.

Referenced by earlycon_fb_init(), and earlycon_fb_register().

fb_yres

uint32_t fb_yres

static

Definition at line 19 of file fb.c.

Referenced by earlycon_fb_init(), and earlycon_fb_register().

vmem

char* vmem = (char *) ARCH_EARLYFB_BASE

static

Definition at line 27 of file fb.c.