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Diffstat (limited to '')
-rw-r--r-- | grub-core/term/i386/coreboot/cbmemc.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/grub-core/term/i386/coreboot/cbmemc.c b/grub-core/term/i386/coreboot/cbmemc.c new file mode 100644 index 0000000..cea9b84 --- /dev/null +++ b/grub-core/term/i386/coreboot/cbmemc.c @@ -0,0 +1,147 @@ +/* + * 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); +} |