Re: [coreboot] coreinfo: Add dmesg module to display v3 printk buffer

[Jordan Crouse]

On 22/04/08 11:10 +0200, Uwe Hermann wrote:
> See patch.
> Uwe.
>
> http://www.hermann-uwe.de  | http://www.holsham-traders.de
> http://www.crazy-hacks.org | http://www.unmaintained-free-software.org
> Add support for a 'Dmesg' module to coreinfo.
>
> It displays the printk buffer in RAM and let's you scroll through it.
> This feature is only available for coreboot v3 though, as v2 doesn't
> have a printk-buffer feature, yet.
>
> Signed-off-by: Uwe Hermann

Wow - thats cute!  
Acked-by: Jordan Crouse
> Index: Kconfig
>
> --- Kconfig	(Revision 3245)
> +++ Kconfig	(Arbeitskopie)
> @@ -64,5 +64,9 @@
>    help
>      This option will increase the ELF file size by ca. 150 bytes.
>
> +config MODULE_DMESG
> bool "Enable the coreboot dmesg buffer module"
> default y
>
> endmenu
> Index: coreinfo.c
>
> --- coreinfo.c	(Revision 3245)
> +++ coreinfo.c	(Arbeitskopie)
> @@ -26,6 +26,7 @@
>  extern struct coreinfo_module pci_module;
>  extern struct coreinfo_module coreboot_module;
>  extern struct coreinfo_module nvram_module;
> +extern struct coreinfo_module dmesg_module;
>
> struct coreinfo_module *modules[] = {
>  #ifdef CONFIG_MODULE_CPUINFO
> @@ -40,6 +41,9 @@
>  #ifdef CONFIG_MODULE_NVRAM
>    &nvram_module,
>  #endif
> +#ifdef CONFIG_MODULE_DMESG
> &dmesg_module,
>
> +#endif
>  };
>
> static WINDOW *modwin;
> Index: dmesg_module.c
> ===================================================================
> --- dmesg_module.c	(Revision 0)
> +++ dmesg_module.c	(Revision 0)
> @@ -0,0 +1,143 @@
> +/*
> This file is part of the coreinfo project.
> Copyright (C) 2008 Uwe Hermann
> This program 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; version 2 of the License.
> This program 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 this program; if not, write to the Free Software
> Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
> */
>
> +#include "coreinfo.h"
>
> +#ifdef CONFIG_MODULE_DMESG
>
> +#define CONFIG_COREBOOT_PRINTK_BUFFER_ADDR 0x90000
> +#define CONFIG_COREBOOT_PRINTK_BUFFER_SIZE 65536
>
> +static char *buf;
> +static s32 cursor = 0;
> +static s32 cursor_max;
>
> +static int dmesg_module_init(void)
> +{
> int i;
> volatile unsigned long *ptr =
> (void *)(CONFIG_COREBOOT_PRINTK_BUFFER_ADDR + 16); /* FIXME */
> buf = malloc(CONFIG_COREBOOT_PRINTK_BUFFER_SIZE);
> if (!buf) {
> /* TODO */
> }
> memcpy(buf, (char *)ptr, CONFIG_COREBOOT_PRINTK_BUFFER_SIZE);
> cursor_max = CONFIG_COREBOOT_PRINTK_BUFFER_SIZE;
> for (i = 0; i < 20; i++) {
> do {
> 	cursor_max--;
> } while (*(buf + cursor_max) != '\n');
> }
> cursor_max++;	/* Stay _behind_ the newline. */
> /* TODO: Maybe a _cleanup hook where we call free()? */
> return 0;
>
> +}
>
> +static int dmesg_module_redraw(WINDOW *win)
> +{
> int x = 0, y = 0;
> char *tmp = buf + cursor;
> print_module_title(win, "Coreboot Dmesg Buffer");
> /* FIXME: Handle lines longer than 80 characters. */
> while (y <= 18) {
> mvwaddnstr(win, y + 2, x, tmp, 1);
> x++;
> tmp++;
> if (*tmp == '\n') {
> 	y++;
> 	x = 0;
> 	tmp++;		/* Skip the newline. */
> }
> }
> return 0;
>
> +}
>
> +/* TODO: Simplify code. */
> +static int dmesg_module_handle(int key)
> +{
> int i;
> switch (key) {
> case KEY_DOWN:
> if (cursor == cursor_max)
> 	return 0;
> while (*(buf + cursor) != '\n')
> 	cursor++;
> cursor++;	/* Skip the newline. */
> break;
> case KEY_UP:
> if (cursor == 0)
> 	return 0;
> cursor--;	/* Skip the newline. */
> do {
> 	cursor--;
> } while (*(buf + cursor) != '\n');
> cursor++;	/* Stay _behind_ the newline. */
> break;
> case KEY_NPAGE:
> if (cursor == cursor_max)
> 	return 0;
> for (i = 0; i < 20; i++) {
> 	while (*(buf + cursor) != '\n')
> 		cursor++;
> 	cursor++;	/* Skip the newline. */
> }
> break;
> case KEY_PPAGE:
> if (cursor == 0)
> 	return 0;
> for (i = 0; i < 20; i++) {
> 	do {
> 		cursor--;
> 	} while (*(buf + cursor) != '\n');
> }
> cursor++;	/* Stay _behind_ the newline. */
> break;
> }
> if (cursor > cursor_max)
> cursor = cursor_max;
> if (cursor < 0)
> cursor = 0;
> return 1;
>
> +}
>
> +struct coreinfo_module dmesg_module = {
> .name = "Dmesg",
> .init = dmesg_module_init,
> .redraw = dmesg_module_redraw,
> .handle = dmesg_module_handle,
>
> +};
>
> +#else
>
> +struct coreinfo_module dmesg_module = {
> +};
>
> +#endif
> Index: Makefile
> ===================================================================
> --- Makefile	(Revision 3245)
> +++ Makefile	(Arbeitskopie)
> @@ -51,7 +51,7 @@
>  INCLUDES = -Ibuild
>  CFLAGS := -Wall -Werror -Os $(INCLUDES)
>  OBJECTS = cpuinfo_module.o cpuid.S.o pci_module.o coreboot_module.o \
>  nvram_module.o coreinfo.o
>  nvram_module.o dmesg_module.o coreinfo.o
>
> OBJS    = $(patsubst %,$(obj)/%,$(OBJECTS))
>  TARGET  = $(obj)/coreinfo.elf
>