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opengnsys_ipxe/src/arch/i386/interface/pcbios/vesafb.c

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/*
* Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* VESA frame buffer console
*
*/
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <realmode.h>
#include <ipxe/console.h>
#include <ipxe/io.h>
#include <ipxe/ansicol.h>
#include <ipxe/fbcon.h>
#include <ipxe/vesafb.h>
#include <config/console.h>
/* Avoid dragging in BIOS console if not otherwise used */
extern struct console_driver bios_console;
struct console_driver bios_console __attribute__ (( weak ));
/* Disambiguate the various error causes */
#define EIO_FAILED __einfo_error ( EINFO_EIO_FAILED )
#define EINFO_EIO_FAILED \
__einfo_uniqify ( EINFO_EIO, 0x01, \
"Function call failed" )
#define EIO_HARDWARE __einfo_error ( EINFO_EIO_HARDWARE )
#define EINFO_EIO_HARDWARE \
__einfo_uniqify ( EINFO_EIO, 0x02, \
"Not supported in current configuration" )
#define EIO_MODE __einfo_error ( EINFO_EIO_MODE )
#define EINFO_EIO_MODE \
__einfo_uniqify ( EINFO_EIO, 0x03, \
"Invalid in current video mode" )
#define EIO_VBE( code ) \
EUNIQ ( EINFO_EIO, (code), EIO_FAILED, EIO_HARDWARE, EIO_MODE )
/* Set default console usage if applicable */
#if ! ( defined ( CONSOLE_VESAFB ) && CONSOLE_EXPLICIT ( CONSOLE_VESAFB ) )
#undef CONSOLE_VESAFB
#define CONSOLE_VESAFB ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
#endif
/** Character height */
#define VESAFB_CHAR_HEIGHT 16
/** Font corresponding to selected character width and height */
#define VESAFB_FONT VBE_FONT_8x16
/* Forward declaration */
struct console_driver vesafb_console __console_driver;
/** A VESA frame buffer */
struct vesafb {
/** Frame buffer console */
struct fbcon fbcon;
/** Physical start address */
physaddr_t start;
/** Pixel geometry */
struct fbcon_geometry pixel;
/** Margin */
struct fbcon_margin margin;
/** Colour mapping */
struct fbcon_colour_map map;
/** Font definition */
struct fbcon_font font;
/** Character glyphs */
struct segoff glyphs;
/** Saved VGA mode */
uint8_t saved_mode;
};
/** The VESA frame buffer */
static struct vesafb vesafb;
/** Base memory buffer used for VBE calls */
union vbe_buffer {
/** VBE controller information block */
struct vbe_controller_info controller;
/** VBE mode information block */
struct vbe_mode_info mode;
};
static union vbe_buffer __bss16 ( vbe_buf );
#define vbe_buf __use_data16 ( vbe_buf )
/**
* Convert VBE status code to iPXE status code
*
* @v status VBE status code
* @ret rc Return status code
*/
static int vesafb_rc ( unsigned int status ) {
unsigned int code;
if ( ( status & 0xff ) != 0x4f )
return -ENOTSUP;
code = ( ( status >> 8 ) & 0xff );
return ( code ? -EIO_VBE ( code ) : 0 );
}
/**
* Get character glyph
*
* @v character Character
* @v glyph Character glyph to fill in
*/
static void vesafb_glyph ( unsigned int character, uint8_t *glyph ) {
size_t offset = ( character * VESAFB_CHAR_HEIGHT );
copy_from_real ( glyph, vesafb.glyphs.segment,
( vesafb.glyphs.offset + offset ), VESAFB_CHAR_HEIGHT);
}
/**
* Get font definition
*
*/
static void vesafb_font ( void ) {
/* Get font information
*
* Working around gcc bugs is icky here. The value we want is
* returned in %ebp, but there's no way to specify %ebp in an
* output constraint. We can't put %ebp in the clobber list,
* because this tends to cause random build failures on some
* gcc versions. We can't manually push/pop %ebp and return
* the value via a generic register output constraint, because
* gcc might choose to use %ebp to satisfy that constraint
* (and we have no way to prevent it from so doing).
*
* Work around this hideous mess by using %ecx and %edx as the
* output registers, since they get clobbered anyway.
*/
__asm__ __volatile__ ( REAL_CODE ( "pushw %%bp\n\t" /* gcc bug */
"int $0x10\n\t"
"movw %%es, %%cx\n\t"
"movw %%bp, %%dx\n\t"
"popw %%bp\n\t" /* gcc bug */ )
: "=c" ( vesafb.glyphs.segment ),
"=d" ( vesafb.glyphs.offset )
: "a" ( VBE_GET_FONT ),
"b" ( VESAFB_FONT ) );
DBGC ( &vbe_buf, "VESAFB has font %04x at %04x:%04x\n",
VESAFB_FONT, vesafb.glyphs.segment, vesafb.glyphs.offset );
vesafb.font.height = VESAFB_CHAR_HEIGHT;
vesafb.font.glyph = vesafb_glyph;
}
/**
* Get VBE mode list
*
* @ret mode_numbers Mode number list (terminated with VBE_MODE_END)
* @ret rc Return status code
*
* The caller is responsible for eventually freeing the mode list.
*/
static int vesafb_mode_list ( uint16_t **mode_numbers ) {
struct vbe_controller_info *controller = &vbe_buf.controller;
userptr_t video_mode_ptr;
uint16_t mode_number;
uint16_t status;
size_t len;
int rc;
/* Avoid returning uninitialised data on error */
*mode_numbers = NULL;
/* Get controller information block */
controller->vbe_signature = 0;
__asm__ __volatile__ ( REAL_CODE ( "int $0x10" )
: "=a" ( status )
: "a" ( VBE_CONTROLLER_INFO ),
"D" ( __from_data16 ( controller ) )
: "memory", "ebx", "edx" );
if ( ( rc = vesafb_rc ( status ) ) != 0 ) {
DBGC ( &vbe_buf, "VESAFB could not get controller information: "
"[%04x] %s\n", status, strerror ( rc ) );
return rc;
}
if ( controller->vbe_signature != VBE_CONTROLLER_SIGNATURE ) {
DBGC ( &vbe_buf, "VESAFB invalid controller signature "
"\"%c%c%c%c\"\n", ( controller->vbe_signature >> 0 ),
( controller->vbe_signature >> 8 ),
( controller->vbe_signature >> 16 ),
( controller->vbe_signature >> 24 ) );
DBGC_HDA ( &vbe_buf, 0, controller, sizeof ( *controller ) );
return -EINVAL;
}
DBGC ( &vbe_buf, "VESAFB found VBE version %d.%d with mode list at "
"%04x:%04x\n", controller->vbe_major_version,
controller->vbe_minor_version,
controller->video_mode_ptr.segment,
controller->video_mode_ptr.offset );
/* Calculate length of mode list */
video_mode_ptr = real_to_user ( controller->video_mode_ptr.segment,
controller->video_mode_ptr.offset );
len = 0;
do {
copy_from_user ( &mode_number, video_mode_ptr, len,
sizeof ( mode_number ) );
len += sizeof ( mode_number );
} while ( mode_number != VBE_MODE_END );
/* Allocate and fill mode list */
*mode_numbers = malloc ( len );
if ( ! *mode_numbers )
return -ENOMEM;
copy_from_user ( *mode_numbers, video_mode_ptr, 0, len );
return 0;
}
/**
* Get video mode information
*
* @v mode_number Mode number
* @ret rc Return status code
*/
static int vesafb_mode_info ( unsigned int mode_number ) {
struct vbe_mode_info *mode = &vbe_buf.mode;
uint16_t status;
int rc;
/* Get mode information */
__asm__ __volatile__ ( REAL_CODE ( "int $0x10" )
: "=a" ( status )
: "a" ( VBE_MODE_INFO ),
"c" ( mode_number ),
"D" ( __from_data16 ( mode ) )
: "memory" );
if ( ( rc = vesafb_rc ( status ) ) != 0 ) {
DBGC ( &vbe_buf, "VESAFB could not get mode %04x information: "
"[%04x] %s\n", mode_number, status, strerror ( rc ) );
return rc;
}
DBGC ( &vbe_buf, "VESAFB mode %04x %dx%d %dbpp(%d:%d:%d:%d) model "
"%02x [x%d]%s%s%s%s%s\n", mode_number, mode->x_resolution,
mode->y_resolution, mode->bits_per_pixel, mode->rsvd_mask_size,
mode->red_mask_size, mode->green_mask_size, mode->blue_mask_size,
mode->memory_model, ( mode->number_of_image_pages + 1 ),
( ( mode->mode_attributes & VBE_MODE_ATTR_SUPPORTED ) ?
"" : " [unsupported]" ),
( ( mode->mode_attributes & VBE_MODE_ATTR_TTY ) ?
" [tty]" : "" ),
( ( mode->mode_attributes & VBE_MODE_ATTR_GRAPHICS ) ?
"" : " [text]" ),
( ( mode->mode_attributes & VBE_MODE_ATTR_LINEAR ) ?
"" : " [nonlinear]" ),
( ( mode->mode_attributes & VBE_MODE_ATTR_TRIPLE_BUF ) ?
" [buf]" : "" ) );
return 0;
}
/**
* Set video mode
*
* @v mode_number Mode number
* @ret rc Return status code
*/
static int vesafb_set_mode ( unsigned int mode_number ) {
struct vbe_mode_info *mode = &vbe_buf.mode;
uint16_t status;
int rc;
/* Get mode information */
if ( ( rc = vesafb_mode_info ( mode_number ) ) != 0 )
return rc;
/* Record mode parameters */
vesafb.start = mode->phys_base_ptr;
vesafb.pixel.width = mode->x_resolution;
vesafb.pixel.height = mode->y_resolution;
vesafb.pixel.len = ( ( mode->bits_per_pixel + 7 ) / 8 );
vesafb.pixel.stride = mode->bytes_per_scan_line;
DBGC ( &vbe_buf, "VESAFB mode %04x has frame buffer at %08x\n",
mode_number, mode->phys_base_ptr );
/* Initialise font colours */
vesafb.map.red_scale = ( 8 - mode->red_mask_size );
vesafb.map.green_scale = ( 8 - mode->green_mask_size );
vesafb.map.blue_scale = ( 8 - mode->blue_mask_size );
vesafb.map.red_lsb = mode->red_field_position;
vesafb.map.green_lsb = mode->green_field_position;
vesafb.map.blue_lsb = mode->blue_field_position;
/* Select this mode */
__asm__ __volatile__ ( REAL_CODE ( "int $0x10" )
: "=a" ( status )
: "a" ( VBE_SET_MODE ),
"b" ( mode_number ) );
if ( ( rc = vesafb_rc ( status ) ) != 0 ) {
DBGC ( &vbe_buf, "VESAFB could not set mode %04x: [%04x] %s\n",
mode_number, status, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Select video mode
*
* @v mode_numbers Mode number list (terminated with VBE_MODE_END)
* @v min_width Minimum required width (in pixels)
* @v min_height Minimum required height (in pixels)
* @v min_bpp Minimum required colour depth (in bits per pixel)
* @ret mode_number Mode number, or negative error
*/
static int vesafb_select_mode ( const uint16_t *mode_numbers,
unsigned int min_width, unsigned int min_height,
unsigned int min_bpp ) {
struct vbe_mode_info *mode = &vbe_buf.mode;
int best_mode_number = -ENOENT;
unsigned int best_score = INT_MAX;
unsigned int score;
uint16_t mode_number;
int rc;
/* Find the first suitable mode */
while ( ( mode_number = *(mode_numbers++) ) != VBE_MODE_END ) {
/* Force linear mode variant */
mode_number |= VBE_MODE_LINEAR;
/* Get mode information */
if ( ( rc = vesafb_mode_info ( mode_number ) ) != 0 )
continue;
/* Skip unusable modes */
if ( ( mode->mode_attributes & ( VBE_MODE_ATTR_SUPPORTED |
VBE_MODE_ATTR_GRAPHICS |
VBE_MODE_ATTR_LINEAR ) ) !=
( VBE_MODE_ATTR_SUPPORTED | VBE_MODE_ATTR_GRAPHICS |
VBE_MODE_ATTR_LINEAR ) ) {
continue;
}
if ( mode->memory_model != VBE_MODE_MODEL_DIRECT_COLOUR )
continue;
/* Skip modes not meeting the requirements */
if ( ( mode->x_resolution < min_width ) ||
( mode->y_resolution < min_height ) ||
( mode->bits_per_pixel < min_bpp ) ) {
continue;
}
/* Select this mode if it has the best (i.e. lowest)
* score. We choose the scoring system to favour
* modes close to the specified width and height;
* within modes of the same width and height we prefer
* a higher colour depth.
*/
score = ( ( mode->x_resolution * mode->y_resolution ) -
mode->bits_per_pixel );
if ( score < best_score ) {
best_mode_number = mode_number;
best_score = score;
}
}
if ( best_mode_number >= 0 ) {
DBGC ( &vbe_buf, "VESAFB selected mode %04x\n",
best_mode_number );
} else {
DBGC ( &vbe_buf, "VESAFB found no suitable mode\n" );
}
return best_mode_number;
}
/**
* Restore video mode
*
*/
static void vesafb_restore ( void ) {
uint32_t discard_a;
/* Restore saved VGA mode */
__asm__ __volatile__ ( REAL_CODE ( "int $0x10" )
: "=a" ( discard_a )
: "a" ( VBE_SET_VGA_MODE | vesafb.saved_mode ) );
DBGC ( &vbe_buf, "VESAFB restored VGA mode %#02x\n",
vesafb.saved_mode );
}
/**
* Initialise VESA frame buffer
*
* @v config Console configuration, or NULL to reset
* @ret rc Return status code
*/
static int vesafb_init ( struct console_configuration *config ) {
uint32_t discard_b;
uint16_t *mode_numbers;
unsigned int xgap;
unsigned int ygap;
unsigned int left;
unsigned int right;
unsigned int top;
unsigned int bottom;
int mode_number;
int rc;
/* Record current VGA mode */
__asm__ __volatile__ ( REAL_CODE ( "int $0x10" )
: "=a" ( vesafb.saved_mode ), "=b" ( discard_b )
: "a" ( VBE_GET_VGA_MODE ) );
DBGC ( &vbe_buf, "VESAFB saved VGA mode %#02x\n", vesafb.saved_mode );
/* Get VESA mode list */
if ( ( rc = vesafb_mode_list ( &mode_numbers ) ) != 0 )
goto err_mode_list;
/* Select mode */
if ( ( mode_number = vesafb_select_mode ( mode_numbers, config->width,
config->height,
config->depth ) ) < 0 ) {
rc = mode_number;
goto err_select_mode;
}
/* Set mode */
if ( ( rc = vesafb_set_mode ( mode_number ) ) != 0 )
goto err_set_mode;
/* Calculate margin. If the actual screen size is larger than
* the requested screen size, then update the margins so that
* the margin remains relative to the requested screen size.
* (As an exception, if a zero margin was specified then treat
* this as meaning "expand to edge of actual screen".)
*/
xgap = ( vesafb.pixel.width - config->width );
ygap = ( vesafb.pixel.height - config->height );
left = ( xgap / 2 );
right = ( xgap - left );
top = ( ygap / 2 );
bottom = ( ygap - top );
vesafb.margin.left = ( config->left + ( config->left ? left : 0 ) );
vesafb.margin.right = ( config->right + ( config->right ? right : 0 ) );
vesafb.margin.top = ( config->top + ( config->top ? top : 0 ) );
vesafb.margin.bottom =
( config->bottom + ( config->bottom ? bottom : 0 ) );
/* Get font data */
vesafb_font();
/* Initialise frame buffer console */
if ( ( rc = fbcon_init ( &vesafb.fbcon, phys_to_user ( vesafb.start ),
&vesafb.pixel, &vesafb.margin, &vesafb.map,
&vesafb.font, config->pixbuf ) ) != 0 )
goto err_fbcon_init;
free ( mode_numbers );
return 0;
fbcon_fini ( &vesafb.fbcon );
err_fbcon_init:
err_set_mode:
vesafb_restore();
err_select_mode:
free ( mode_numbers );
err_mode_list:
return rc;
}
/**
* Finalise VESA frame buffer
*
*/
static void vesafb_fini ( void ) {
/* Finalise frame buffer console */
fbcon_fini ( &vesafb.fbcon );
/* Restore saved VGA mode */
vesafb_restore();
}
/**
* Print a character to current cursor position
*
* @v character Character
*/
static void vesafb_putchar ( int character ) {
fbcon_putchar ( &vesafb.fbcon, character );
}
/**
* Configure console
*
* @v config Console configuration, or NULL to reset
* @ret rc Return status code
*/
static int vesafb_configure ( struct console_configuration *config ) {
int rc;
/* Reset console, if applicable */
if ( ! vesafb_console.disabled ) {
vesafb_fini();
bios_console.disabled &= ~CONSOLE_DISABLED_OUTPUT;
ansicol_reset_magic();
}
vesafb_console.disabled = CONSOLE_DISABLED;
/* Do nothing more unless we have a usable configuration */
if ( ( config == NULL ) ||
( config->width == 0 ) || ( config->height == 0 ) ) {
return 0;
}
/* Initialise VESA frame buffer */
if ( ( rc = vesafb_init ( config ) ) != 0 )
return rc;
/* Mark console as enabled */
vesafb_console.disabled = 0;
bios_console.disabled |= CONSOLE_DISABLED_OUTPUT;
/* Set magic colour to transparent if we have a background picture */
if ( config->pixbuf )
ansicol_set_magic_transparent();
return 0;
}
/** VESA frame buffer console driver */
struct console_driver vesafb_console __console_driver = {
.usage = CONSOLE_VESAFB,
.putchar = vesafb_putchar,
.configure = vesafb_configure,
.disabled = CONSOLE_DISABLED,
};
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