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-rw-r--r--grub-core/term/i386/pc/vga_text.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/grub-core/term/i386/pc/vga_text.c b/grub-core/term/i386/pc/vga_text.c
new file mode 100644
index 0000000..88fecc5
--- /dev/null
+++ b/grub-core/term/i386/pc/vga_text.c
@@ -0,0 +1,288 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2007, 2008, 2010 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/cpu/io.h>
+#include <grub/types.h>
+#include <grub/vga.h>
+#include <grub/term.h>
+
+#if defined (GRUB_MACHINE_COREBOOT)
+#include <grub/machine/console.h>
+#endif
+
+/* MODESET is used for testing to force monochrome or colour mode.
+ You shouldn't use mda_text on vga.
+ */
+#ifdef MODESET
+#include <grub/machine/int.h>
+#endif
+
+#if defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU) || defined (GRUB_MACHINE_MIPS_QEMU_MIPS) || defined (GRUB_MACHINE_MULTIBOOT)
+#include <grub/machine/console.h>
+#endif
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define COLS 80
+#define ROWS 25
+
+static struct grub_term_coordinate grub_curr_pos;
+
+#ifdef __mips__
+#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb00b8000)
+#define cr_read grub_vga_cr_read
+#define cr_write grub_vga_cr_write
+#elif defined (MODE_MDA)
+#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb0000)
+#define cr_read grub_vga_cr_bw_read
+#define cr_write grub_vga_cr_bw_write
+#else
+#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb8000)
+#define cr_read grub_vga_cr_read
+#define cr_write grub_vga_cr_write
+#endif
+
+static grub_uint8_t cur_color = 0x7;
+
+static void
+screen_write_char (int x, int y, short c)
+{
+ VGA_TEXT_SCREEN[y * COLS + x] = grub_cpu_to_le16 (c);
+}
+
+static short
+screen_read_char (int x, int y)
+{
+ return grub_le_to_cpu16 (VGA_TEXT_SCREEN[y * COLS + x]);
+}
+
+static void
+update_cursor (void)
+{
+ unsigned int pos = grub_curr_pos.y * COLS + grub_curr_pos.x;
+ cr_write (pos >> 8, GRUB_VGA_CR_CURSOR_ADDR_HIGH);
+ cr_write (pos & 0xFF, GRUB_VGA_CR_CURSOR_ADDR_LOW);
+}
+
+static void
+inc_y (void)
+{
+ grub_curr_pos.x = 0;
+ if (grub_curr_pos.y < ROWS - 1)
+ grub_curr_pos.y++;
+ else
+ {
+ int x, y;
+ for (y = 0; y < ROWS - 1; y++)
+ for (x = 0; x < COLS; x++)
+ screen_write_char (x, y, screen_read_char (x, y + 1));
+ for (x = 0; x < COLS; x++)
+ screen_write_char (x, ROWS - 1, ' ' | (cur_color << 8));
+ }
+}
+
+static void
+inc_x (void)
+{
+ if (grub_curr_pos.x >= COLS - 1)
+ inc_y ();
+ else
+ grub_curr_pos.x++;
+}
+
+static void
+grub_vga_text_putchar (struct grub_term_output *term __attribute__ ((unused)),
+ const struct grub_unicode_glyph *c)
+{
+ switch (c->base)
+ {
+ case '\b':
+ if (grub_curr_pos.x != 0)
+ screen_write_char (grub_curr_pos.x--, grub_curr_pos.y, ' ');
+ break;
+ case '\n':
+ inc_y ();
+ break;
+ case '\r':
+ grub_curr_pos.x = 0;
+ break;
+ default:
+ screen_write_char (grub_curr_pos.x, grub_curr_pos.y,
+ c->base | (cur_color << 8));
+ inc_x ();
+ }
+
+ update_cursor ();
+}
+
+static struct grub_term_coordinate
+grub_vga_text_getxy (struct grub_term_output *term __attribute__ ((unused)))
+{
+ return grub_curr_pos;
+}
+
+static void
+grub_vga_text_gotoxy (struct grub_term_output *term __attribute__ ((unused)),
+ struct grub_term_coordinate pos)
+{
+ grub_curr_pos = pos;
+ update_cursor ();
+}
+
+static void
+grub_vga_text_cls (struct grub_term_output *term)
+{
+ int i;
+ for (i = 0; i < ROWS * COLS; i++)
+ VGA_TEXT_SCREEN[i] = grub_cpu_to_le16 (' ' | (cur_color << 8));
+ grub_vga_text_gotoxy (term, (struct grub_term_coordinate) { 0, 0 });
+}
+
+static void
+grub_vga_text_setcursor (struct grub_term_output *term __attribute__ ((unused)),
+ int on)
+{
+ grub_uint8_t old;
+ old = cr_read (GRUB_VGA_CR_CURSOR_START);
+ if (on)
+ cr_write (old & ~GRUB_VGA_CR_CURSOR_START_DISABLE,
+ GRUB_VGA_CR_CURSOR_START);
+ else
+ cr_write (old | GRUB_VGA_CR_CURSOR_START_DISABLE,
+ GRUB_VGA_CR_CURSOR_START);
+}
+
+static grub_err_t
+grub_vga_text_init_real (struct grub_term_output *term)
+{
+#ifdef MODESET
+ struct grub_bios_int_registers regs;
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+
+#ifdef MODE_MDA
+ regs.eax = 7;
+#else
+ regs.eax = 3;
+#endif
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+ grub_bios_interrupt (0x10, &regs);
+#endif
+ grub_vga_text_cls (term);
+ return 0;
+}
+
+static grub_err_t
+grub_vga_text_fini_real (struct grub_term_output *term)
+{
+#ifdef MODESET
+ struct grub_bios_int_registers regs;
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+
+ regs.eax = 3;
+ regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
+ grub_bios_interrupt (0x10, &regs);
+#endif
+ grub_vga_text_cls (term);
+ return 0;
+}
+
+static struct grub_term_coordinate
+grub_vga_text_getwh (struct grub_term_output *term __attribute__ ((unused)))
+{
+ return (struct grub_term_coordinate) { 80, 25 };
+}
+
+#ifndef MODE_MDA
+
+static void
+grub_vga_text_setcolorstate (struct grub_term_output *term __attribute__ ((unused)),
+ grub_term_color_state state)
+{
+ switch (state) {
+ case GRUB_TERM_COLOR_STANDARD:
+ cur_color = GRUB_TERM_DEFAULT_STANDARD_COLOR & 0x7f;
+ break;
+ case GRUB_TERM_COLOR_NORMAL:
+ cur_color = grub_term_normal_color & 0x7f;
+ break;
+ case GRUB_TERM_COLOR_HIGHLIGHT:
+ cur_color = grub_term_highlight_color & 0x7f;
+ break;
+ default:
+ break;
+ }
+}
+
+#else
+static void
+grub_vga_text_setcolorstate (struct grub_term_output *term __attribute__ ((unused)),
+ grub_term_color_state state)
+{
+ switch (state) {
+ case GRUB_TERM_COLOR_STANDARD:
+ cur_color = 0x07;
+ break;
+ case GRUB_TERM_COLOR_NORMAL:
+ cur_color = 0x07;
+ break;
+ case GRUB_TERM_COLOR_HIGHLIGHT:
+ cur_color = 0x70;
+ break;
+ default:
+ break;
+ }
+}
+#endif
+
+static struct grub_term_output grub_vga_text_term =
+ {
+#ifdef MODE_MDA
+ .name = "mda_text",
+#else
+ .name = "vga_text",
+#endif
+ .init = grub_vga_text_init_real,
+ .fini = grub_vga_text_fini_real,
+ .putchar = grub_vga_text_putchar,
+ .getwh = grub_vga_text_getwh,
+ .getxy = grub_vga_text_getxy,
+ .gotoxy = grub_vga_text_gotoxy,
+ .cls = grub_vga_text_cls,
+ .setcolorstate = grub_vga_text_setcolorstate,
+ .setcursor = grub_vga_text_setcursor,
+ .flags = GRUB_TERM_CODE_TYPE_CP437,
+ .progress_update_divisor = GRUB_PROGRESS_FAST
+ };
+
+#ifndef MODE_MDA
+
+GRUB_MOD_INIT(vga_text)
+{
+#ifdef GRUB_MACHINE_COREBOOT
+ if (!grub_video_coreboot_fbtable)
+#endif
+ grub_term_register_output ("vga_text", &grub_vga_text_term);
+}
+
+GRUB_MOD_FINI(vga_text)
+{
+ grub_term_unregister_output (&grub_vga_text_term);
+}
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-05 02:18:57 +0000