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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,
* with 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__));
static struct cbmem_console *cbmem_console_p CAR_GLOBAL;
#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;
/*
* 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];
#endif
static inline struct cbmem_console *current_console(void)
{
#if CONFIG_CAR_MIGRATION || !defined(__PRE_RAM__)
return car_get_var(cbmem_console_p);
#else
/*
* 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)__builtin_frame_address(0) <
(uintptr_t)CONFIG_DCACHE_RAM_BASE)
return CBMEM_CONSOLE_REDIRECT;
return car_get_var(cbmem_console_p);
#endif /* CONFIG_CAR_MIGRATION */
}
static inline void current_console_set(struct cbmem_console *new_console_p)
{
#if CONFIG_CAR_MIGRATION || !defined(__PRE_RAM__)
car_set_var(cbmem_console_p, new_console_p);
#else
CBMEM_CONSOLE_REDIRECT = new_console_p;
#endif
}
static inline void init_console_ptr(void *storage, u32 total_space)
{
struct cbmem_console *cbm_cons_p = storage;
/* Initialize the cache-as-ram pointer and underlying structure. */
car_set_var(cbmem_console_p, cbm_cons_p);
cbm_cons_p->buffer_size = total_space - sizeof(struct cbmem_console);
cbm_cons_p->buffer_cursor = 0;
}
void cbmemc_init(void)
{
#ifdef __PRE_RAM__
init_console_ptr(&car_cbmem_console, CONFIG_CONSOLE_CAR_BUFFER_SIZE);
#else
/*
* Initializing before CBMEM is available, use static buffer to store
* the log.
*/
init_console_ptr(static_console, sizeof(static_console));
#endif
}
void cbmemc_tx_byte(unsigned char data)
{
struct cbmem_console *cbm_cons_p = current_console();
u32 cursor;
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 characters.
*/
static void copy_console_buffer(struct cbmem_console *new_cons_p)
{
u32 copy_size;
u32 cursor = new_cons_p->buffer_cursor;
struct cbmem_console *old_cons_p;
int overflow;
old_cons_p = current_console();
overflow = old_cons_p->buffer_cursor > old_cons_p->buffer_size;
copy_size = overflow ?
old_cons_p->buffer_size : old_cons_p->buffer_cursor;
memcpy(new_cons_p->buffer_body + cursor, old_cons_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 = old_cons_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) {
current_console_set(NULL);
return;
}
cbm_cons_p->buffer_size = CONFIG_CONSOLE_CBMEM_BUFFER_SIZE -
sizeof(struct cbmem_console);
cbm_cons_p->buffer_cursor = 0;
#else
cbm_cons_p = cbmem_find(CBMEM_ID_CONSOLE);
if (!cbm_cons_p)
return;
#endif
copy_console_buffer(cbm_cons_p);
current_console_set(cbm_cons_p);
}
/* Call cbmemc_reinit() at CAR migration time. */
CAR_MIGRATE(cbmemc_reinit)
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