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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
*
* 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 <console/console.h>
#include <cbmem.h>
#include <cpu/x86/car.h>
#include <string.h>
/*
* Structure describing console buffer. It is overlaid on a flat memory area,
* whith buffer_body covering the extent of the memory. Once the buffer is
* full, the cursor keeps going but the data is dropped on the floor. This
* allows to tell how much data was lost in the process.
*/
struct cbmem_console {
u32 buffer_size;
u32 buffer_cursor;
u8 buffer_body[0];
} __attribute__ ((__packed__));
#ifdef __PRE_RAM__
/*
* While running from ROM, before DRAM is initialized, some area in cache as
* ram space is used for the console buffer storage. The size and location of
* the area are defined in the config.
*/
static struct cbmem_console car_cbmem_console CAR_CBMEM;
#define cbmem_console_p (&car_cbmem_console)
/*
* Once DRAM is initialized and the cache as ram mode is disabled, while still
* running from ROM, the console buffer in the cache as RAM area becomes
* unavailable.
*
* By this time the console log buffer is already available in
* CBMEM. The location at 0x600 is used as the redirect pointer allowing to
* find out where the actual console log buffer is.
*/
#define CBMEM_CONSOLE_REDIRECT (*((struct cbmem_console **)0x600))
#else
/*
* When running from RAM, a lot of console output is generated before CBMEM is
* reinitialized. This static buffer is used to store that output temporarily,
* to be concatenated with the CBMEM console buffer contents accumulated
* during the ROM stage, once CBMEM becomes available at RAM stage.
*/
static u8 static_console[40000];
static struct cbmem_console *cbmem_console_p;
#endif
void cbmemc_init(void)
{
#ifdef __PRE_RAM__
cbmem_console_p->buffer_size = CONFIG_CONSOLE_CAR_BUFFER_SIZE -
sizeof(struct cbmem_console);
#else
/*
* Initializing before CBMEM is available, use static buffer to store
* the log.
*/
cbmem_console_p = (struct cbmem_console *) static_console;
cbmem_console_p->buffer_size = sizeof(static_console) -
sizeof(struct cbmem_console);
#endif
cbmem_console_p->buffer_cursor = 0;
}
void cbmemc_tx_byte(unsigned char data)
{
struct cbmem_console *cbm_cons_p = cbmem_console_p;
u32 cursor;
#ifdef __PRE_RAM__
/*
* This check allows to tell if the cache as RAM mode has been exited
* or not. If it has been exited, the real memory is being used
* (resulting in the variable on the stack located below
* DCACHE_RAM_BASE), use the redirect pointer to find out where the
* actual console buffer is.
*/
if ((uintptr_t)&cursor < (uintptr_t)&car_cbmem_console)
cbm_cons_p = CBMEM_CONSOLE_REDIRECT;
#endif
if (!cbm_cons_p)
return;
cursor = cbm_cons_p->buffer_cursor++;
if (cursor < cbm_cons_p->buffer_size)
cbm_cons_p->buffer_body[cursor] = data;
}
/*
* Copy the current console buffer (either from the cache as RAM area, or from
* the static buffer, pointed at by cbmem_console_p) into the CBMEM console
* buffer space (pointed at by new_cons_p), concatenating the copied data with
* the CBMEM console buffer contents.
*
* If there is overflow - add to the destination area a string, reporting the
* overflow and the number of dropped charactes.
*/
static void copy_console_buffer(struct cbmem_console *new_cons_p)
{
u32 copy_size;
u32 cursor = new_cons_p->buffer_cursor;
int overflow = cbmem_console_p->buffer_cursor >
cbmem_console_p->buffer_size;
copy_size = overflow ?
cbmem_console_p->buffer_size : cbmem_console_p->buffer_cursor;
memcpy(new_cons_p->buffer_body + cursor,
cbmem_console_p->buffer_body,
copy_size);
cursor += copy_size;
if (overflow) {
const char loss_str1[] = "\n\n*** Log truncated, ";
const char loss_str2[] = " characters dropped. ***\n\n";
u32 dropped_chars = cbmem_console_p->buffer_cursor - copy_size;
/*
* When running from ROM sprintf is not available, a simple
* itoa implementation is used instead.
*/
int got_first_digit = 0;
/* Way more than possible number of dropped characters. */
u32 mult = 100000;
strcpy((char *)new_cons_p->buffer_body + cursor, loss_str1);
cursor += sizeof(loss_str1) - 1;
while (mult) {
int digit = dropped_chars / mult;
if (got_first_digit || digit) {
new_cons_p->buffer_body[cursor++] = digit + '0';
dropped_chars %= mult;
/* Excessive, but keeps it simple */
got_first_digit = 1;
}
mult /= 10;
}
strcpy((char *)new_cons_p->buffer_body + cursor, loss_str2);
cursor += sizeof(loss_str2) - 1;
}
new_cons_p->buffer_cursor = cursor;
}
void cbmemc_reinit(void)
{
struct cbmem_console *cbm_cons_p;
#ifdef __PRE_RAM__
cbm_cons_p = cbmem_add(CBMEM_ID_CONSOLE,
CONFIG_CONSOLE_CBMEM_BUFFER_SIZE);
if (!cbm_cons_p) {
CBMEM_CONSOLE_REDIRECT = NULL;
return;
}
cbm_cons_p->buffer_size = CONFIG_CONSOLE_CBMEM_BUFFER_SIZE -
sizeof(struct cbmem_console);
cbm_cons_p->buffer_cursor = 0;
copy_console_buffer(cbm_cons_p);
CBMEM_CONSOLE_REDIRECT = cbm_cons_p;
#else
cbm_cons_p = cbmem_find(CBMEM_ID_CONSOLE);
if (!cbm_cons_p)
return;
copy_console_buffer(cbm_cons_p);
cbmem_console_p = cbm_cons_p;
#endif
}
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