| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 2013 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/term.h> |
| #include <grub/types.h> |
| #include <grub/misc.h> |
| #include <grub/mm.h> |
| #include <grub/time.h> |
| #include <grub/terminfo.h> |
| #include <grub/dl.h> |
| #include <grub/coreboot/lbio.h> |
| #include <grub/command.h> |
| #include <grub/normal.h> |
| |
| GRUB_MOD_LICENSE ("GPLv3+"); |
| |
| #define CURSOR_MASK ((1 << 28) - 1) |
| #define OVERFLOW (1 << 31) |
| |
| struct grub_linuxbios_cbmemc |
| { |
| grub_uint32_t size; |
| grub_uint32_t cursor; |
| char body[0]; |
| }; |
| |
| static struct grub_linuxbios_cbmemc *cbmemc; |
| |
| static void |
| put (struct grub_term_output *term __attribute__ ((unused)), const int c) |
| { |
| grub_uint32_t flags, cursor; |
| if (!cbmemc) |
| return; |
| flags = cbmemc->cursor & ~CURSOR_MASK; |
| cursor = cbmemc->cursor & CURSOR_MASK; |
| if (cursor >= cbmemc->size) |
| return; |
| cbmemc->body[cursor++] = c; |
| if (cursor >= cbmemc->size) |
| { |
| cursor = 0; |
| flags |= OVERFLOW; |
| } |
| cbmemc->cursor = flags | cursor; |
| } |
| |
| struct grub_terminfo_output_state grub_cbmemc_terminfo_output = |
| { |
| .put = put, |
| .size = { 80, 24 } |
| }; |
| |
| static struct grub_term_output grub_cbmemc_term_output = |
| { |
| .name = "cbmemc", |
| .init = grub_terminfo_output_init, |
| .fini = 0, |
| .putchar = grub_terminfo_putchar, |
| .getxy = grub_terminfo_getxy, |
| .getwh = grub_terminfo_getwh, |
| .gotoxy = grub_terminfo_gotoxy, |
| .cls = grub_terminfo_cls, |
| .setcolorstate = grub_terminfo_setcolorstate, |
| .setcursor = grub_terminfo_setcursor, |
| .flags = GRUB_TERM_CODE_TYPE_ASCII, |
| .data = &grub_cbmemc_terminfo_output, |
| .progress_update_divisor = GRUB_PROGRESS_NO_UPDATE |
| }; |
| |
| static int |
| iterate_linuxbios_table (grub_linuxbios_table_item_t table_item, |
| void *data __attribute__ ((unused))) |
| { |
| if (table_item->tag != GRUB_LINUXBIOS_MEMBER_CBMEMC) |
| return 0; |
| cbmemc = (struct grub_linuxbios_cbmemc *) (grub_addr_t) |
| *(grub_uint64_t *) (table_item + 1); |
| return 1; |
| } |
| |
| static grub_err_t |
| grub_cmd_cbmemc (struct grub_command *cmd __attribute__ ((unused)), |
| int argc __attribute__ ((unused)), |
| char *argv[] __attribute__ ((unused))) |
| { |
| grub_size_t size, cursor; |
| struct grub_linuxbios_cbmemc *real_cbmemc; |
| |
| if (!cbmemc) |
| return grub_error (GRUB_ERR_IO, "no CBMEM console found"); |
| |
| real_cbmemc = cbmemc; |
| cbmemc = 0; |
| cursor = real_cbmemc->cursor & CURSOR_MASK; |
| if (!(real_cbmemc->cursor & OVERFLOW) && cursor < real_cbmemc->size) |
| size = cursor; |
| else |
| size = real_cbmemc->size; |
| if (real_cbmemc->cursor & OVERFLOW) |
| { |
| if (cursor > size) |
| cursor = 0; |
| grub_xnputs(real_cbmemc->body + cursor, size - cursor); |
| grub_xnputs(real_cbmemc->body, cursor); |
| } |
| else |
| grub_xnputs(real_cbmemc->body, size); |
| cbmemc = real_cbmemc; |
| return 0; |
| } |
| |
| static grub_command_t cmd; |
| |
| GRUB_MOD_INIT (cbmemc) |
| { |
| grub_linuxbios_table_iterate (iterate_linuxbios_table, 0); |
| |
| if (cbmemc) |
| grub_term_register_output ("cbmemc", &grub_cbmemc_term_output); |
| |
| cmd = |
| grub_register_command ("cbmemc", grub_cmd_cbmemc, |
| 0, N_("Show CBMEM console content.")); |
| } |
| |
| |
| GRUB_MOD_FINI (cbmemc) |
| { |
| grub_term_unregister_output (&grub_cbmemc_term_output); |
| grub_unregister_command (cmd); |
| } |