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[fbcon] Remove userptr_t from framebuffer console drivers

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Simplify the framebuffer console drivers by assuming that the raw
framebuffer, character cell array, background picture, and glyph data
are all directly accessible via pointer dereferences.

In particular, this avoids the need to copy each glyph during drawing:
the VESA framebuffer driver can simply return a pointer to the glyph
data stored in the video ROM.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-04-25 10:52:26 +01:00
parent 4cca1cadf8
commit aa3cc56ab2
5 changed files with 112 additions and 116 deletions
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22
src/interface/efi/efi_fbcon.c
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@@ -42,6 +42,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/ansicol.h>
#include <ipxe/fbcon.h>
#include <ipxe/console.h>
#include <ipxe/uaccess.h>
#include <ipxe/umalloc.h>
#include <ipxe/rotate.h>
#include <config/console.h>
@@ -91,7 +92,7 @@ struct efifb {
/** Font definition */
struct fbcon_font font;
/** Character glyph cache */
userptr_t glyphs;
uint8_t *glyphs;
/** Dynamic characters in cache */
unsigned int dynamic[EFIFB_DYNAMIC];
/** Next dynamic character cache entry to evict */
@@ -117,14 +118,14 @@ static int efifb_draw ( unsigned int character, unsigned int index,
unsigned int height;
unsigned int x;
unsigned int y;
uint8_t *glyph;
uint8_t bitmask;
size_t offset;
EFI_STATUS efirc;
int rc;
/* Clear existing glyph */
offset = ( index * efifb.font.height );
memset ( ( efifb.glyphs + offset ), 0, efifb.font.height );
glyph = &efifb.glyphs[ index * efifb.font.height ];
memset ( glyph, 0, efifb.font.height );
/* Get glyph */
blt = NULL;
@@ -157,8 +158,7 @@ static int efifb_draw ( unsigned int character, unsigned int index,
pixel++;
}
bitmask ^= toggle;
copy_to_user ( efifb.glyphs, offset++, &bitmask,
sizeof ( bitmask ) );
*(glyph++) = bitmask;
}
/* Free glyph */
@@ -223,11 +223,10 @@ static unsigned int efifb_dynamic ( unsigned int character ) {
* Get character glyph
*
* @v character Unicode character
* @v glyph Character glyph to fill in
* @ret glyph Character glyph to fill in
*/
static void efifb_glyph ( unsigned int character, uint8_t *glyph ) {
static const uint8_t * efifb_glyph ( unsigned int character ) {
unsigned int index;
size_t offset;
/* Identify glyph */
if ( character < EFIFB_ASCII ) {
@@ -241,9 +240,8 @@ static void efifb_glyph ( unsigned int character, uint8_t *glyph ) {
index = efifb_dynamic ( character );
}
/* Copy cached glyph */
offset = ( index * efifb.font.height );
copy_from_user ( glyph, efifb.glyphs, offset, efifb.font.height );
/* Return cached glyph */
return &efifb.glyphs[ index * efifb.font.height ];
}
/**