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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <io/cons/cons.h>
#include <io/cons/font.h>
#include <io/cons/consvar.h>
#include <stdbool.h>
#include <string.h>
#define DEFAULT_BG 0x000000
#define DEFAULT_FG 0xB57614
#define FONT_WIDTH 8
#define FONT_HEIGHT 20
struct cons_scr g_root_scr;
/*
* Get the index into the framebuffer with an x and y
* position.
*
* @pitch: Framebuffer pitch
* @x: X position to plot
* @y: Y position to plot
*
* Returns index
*/
__always_inline static inline size_t
fb_get_index(uint32_t pitch, uint32_t x, uint32_t y)
{
return x + y * (pitch / 4);
}
/*
* Fill a screen with a desired background
* color
*
* @bg: Background color to fill screen
*/
static void
fill_screen(struct cons_scr *scr, uint32_t bg)
{
struct bootvar_fb *fbvars;
size_t len;
if (scr == NULL) {
return;
}
fbvars = &scr->fbvars;
len = fbvars->width * fbvars->pitch;
memset(fbvars->io, bg, len);
}
/*
* Plot a single character onto the screen
*
* @scr: Screen to plot onto
* @ch: Character to plot onto screen
*/
static void
cons_putch(struct cons_scr *scr, struct cons_ch *ch)
{
struct bootvar_fb *fbvars;
struct font_header *hdr;
uint32_t x, y, color;
uint32_t *fbio;
const uint8_t *glyph;
size_t idx;
hdr = (void *)g_CONS_FONT;
glyph = PTR_OFFSET(hdr, FONT_HDRLEN + ch->c * hdr->csize);
fbvars = &scr->fbvars;
fbio = fbvars->io;
x = ch->x;
y = ch->y;
/* Begin the plotting */
for (int cy = 0; cy < hdr->csize; ++cy) {
for (int cx = 0; cx < 8; ++cx) {
color = ISSET(glyph[cy], BIT(8 - cx)) ? ch->fg : ch->bg;
/* Plot the pixel */
idx = fb_get_index(fbvars->pitch, x+cx, y+cy);
fbio[idx] = color;
}
}
}
/*
* Draw a string onto the screen
*/
ssize_t
cons_putstr(struct cons_scr *scr, const char *str, size_t len)
{
struct cons_ch ch;
size_t slen;
if (scr == NULL || str == NULL) {
return -EINVAL;
}
ch.bg = scr->scr_bg;
ch.fg = scr->scr_fg;
ch.y = scr->text_y;
ch.x = scr->text_x;
spinlock_acquire(&scr->lock);
for (size_t i = 0; i < len; ++i) {
ch.c = str[i];
cons_putch(scr, &ch);
scr->text_x += FONT_WIDTH;
/* Handle console x overflow */
if (scr->text_x >= scr->max_col - FONT_WIDTH) {
scr->text_x = 0;
scr->text_y += FONT_HEIGHT;
}
/* Handle console y overflow */
if (scr->text_y >= scr->max_row - FONT_HEIGHT) {
scr->text_x = 0;
scr->text_y = 0;
fill_screen(scr, scr->scr_bg);
}
}
spinlock_release(&scr->lock);
return len;
}
/*
* Initialize the console
*/
int
cons_init(void)
{
static bool is_init = false;
struct bootvars bv;
struct bootvar_fb *fbvars;
int error;
/* Only init once */
if (!is_init) {
is_init = true;
} else {
return -EPERM;
}
memset(&g_root_scr, 0, sizeof(g_root_scr));
/*
* Attempt to acquire the bootvars so we
* can get the framebuffer
*/
error = bootvars_read(&bv, 0);
if (error < 0) {
printf("cons_init: could not read bootvars\n");
is_init = false;
return error;
}
/* Save framebuffer information */
fbvars = &g_root_scr.fbvars;
memcpy(fbvars, &bv.fbvars, sizeof(*fbvars));
/* Set up screen state */
g_root_scr.scr_bg = DEFAULT_BG;
g_root_scr.scr_fg = DEFAULT_FG;
g_root_scr.max_col = fbvars->width;
g_root_scr.max_row = fbvars->height;
fill_screen(&g_root_scr, g_root_scr.scr_bg);
return 0;
}
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