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/* SPDX-License-Identifier: GPL-2.0-only */
#include "coreinfo.h"
#if CONFIG(MODULE_BOOTLOG)
#define LINES_SHOWN 19
#define TAB_WIDTH 2
/* Globals that are used for tracking screen state */
static char *g_buf = NULL;
static s32 g_line = 0;
static s32 g_lines_count = 0;
static s32 g_max_cursor_line = 0;
/* Copied from libpayload/drivers/cbmem_console.c */
struct cbmem_console {
u32 size;
u32 cursor;
u8 body[0];
} __packed;
#define CURSOR_MASK ((1 << 28) - 1)
#define OVERFLOW (1 << 31)
static u32 char_width(char c, u32 cursor, u32 screen_width)
{
if (c == '\n') {
return screen_width - (cursor % screen_width);
} else if (c == '\t') {
return TAB_WIDTH;
} else if (isprint(c)) {
return 1;
}
return 0;
}
static u32 calculate_chars_count(char *str, u32 str_len, u32 screen_width, u32 screen_height)
{
u32 i, count = 0;
for (i = 0; i < str_len; i++) {
count += char_width(str[i], count, screen_width);
}
/* Ensure that 'count' can occupy at least the whole screen */
if (count < screen_width * screen_height) {
count = screen_width * screen_height;
}
/* Pad to line end */
if (count % screen_width != 0) {
count += screen_width - (count % screen_width);
}
return count;
}
/*
* This method takes an input buffer and sanitizes it for display, which means:
* - '\n' is converted to spaces until end of line
* - Tabs are converted to spaces of size TAB_WIDTH
* - Only printable characters are preserved
*/
static int sanitize_buffer_for_display(char *str, u32 str_len, char *out, u32 out_len, u32 screen_width)
{
u32 cursor = 0;
u32 i;
for (i = 0; i < str_len && cursor < out_len; i++) {
u32 width = char_width(str[i], cursor, screen_width);
if (width == 1) {
out[cursor++] = str[i];
} else if (width > 1) {
while (width-- && cursor < out_len) {
out[cursor++] = ' ';
}
}
}
/* Fill the rest of the out buffer with spaces */
while (cursor < out_len) {
out[cursor++] = ' ';
}
return 0;
}
static int bootlog_module_init(void)
{
/* Make sure that lib_sysinfo is initialized */
int ret = lib_get_sysinfo();
if (ret) {
return -1;
}
struct cbmem_console *console = phys_to_virt(lib_sysinfo.cbmem_cons);
if (console == NULL) {
return -1;
}
/* Extract console information */
char *buffer = (char *)(&(console->body));
u32 size = console->size;
u32 cursor = console->cursor & CURSOR_MASK;
/* The cursor may be bigger than buffer size with older console code */
if (cursor >= size) {
cursor = size - 1;
}
/* Calculate how much characters will be displayed on screen */
u32 chars_count = calculate_chars_count(buffer, cursor, SCREEN_X, LINES_SHOWN);
u32 overflow_chars_count = 0;
if (console->cursor & OVERFLOW) {
overflow_chars_count = calculate_chars_count(buffer + cursor,
size - cursor, SCREEN_X, LINES_SHOWN);
}
/* Sanity check, chars_count must be padded to full line */
if (chars_count % SCREEN_X || overflow_chars_count % SCREEN_X) {
return -2;
}
g_lines_count = (chars_count + overflow_chars_count) / SCREEN_X;
g_max_cursor_line = MAX(g_lines_count - 1 - LINES_SHOWN, 0);
g_buf = malloc(chars_count);
if (!g_buf) {
return -3;
}
if (console->cursor & OVERFLOW) {
if (sanitize_buffer_for_display(buffer + cursor, size - cursor,
g_buf, overflow_chars_count, SCREEN_X) < 0) {
goto err_free;
}
}
if (sanitize_buffer_for_display(buffer, cursor,
g_buf + overflow_chars_count,
chars_count, SCREEN_X) < 0) {
goto err_free;
}
/* TODO: Maybe a _cleanup hook where we call free()? */
return 0;
err_free:
free(g_buf);
g_buf = NULL;
return -4;
}
static int bootlog_module_redraw(WINDOW *win)
{
print_module_title(win, "coreboot Bootlog");
if (!g_buf) {
return -1;
}
int x = 0, y = 0;
char *tmp = g_buf + g_line * SCREEN_X;
for (y = 0; y < LINES_SHOWN; y++) {
for (x = 0; x < SCREEN_X; x++) {
mvwaddch(win, y + 2, x, *tmp);
tmp++;
}
}
return 0;
}
static int bootlog_module_handle(int key)
{
if (!g_buf) {
return 0;
}
switch (key) {
case KEY_DOWN:
g_line++;
break;
case KEY_UP:
g_line--;
break;
case KEY_NPAGE: /* Page up */
g_line -= LINES_SHOWN;
break;
case KEY_PPAGE: /* Page down */
g_line += LINES_SHOWN;
break;
}
if (g_line < 0)
g_line = 0;
if (g_line > g_max_cursor_line)
g_line = g_max_cursor_line;
return 1;
}
struct coreinfo_module bootlog_module = {
.name = "Bootlog",
.init = bootlog_module_init,
.redraw = bootlog_module_redraw,
.handle = bootlog_module_handle,
};
#else
struct coreinfo_module bootlog_module = {
};
#endif
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