| /* |
| * 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 <arch/early_variables.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; |
| |
| #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. |
| */ |
| |
| #if CONFIG_DYNAMIC_CBMEM |
| #define STATIC_CONSOLE_SIZE 1024 |
| #else |
| #define STATIC_CONSOLE_SIZE 40000 |
| #endif |
| static u8 static_console[STATIC_CONSOLE_SIZE]; |
| #endif |
| |
| static inline struct cbmem_console *current_console(void) |
| { |
| return car_get_var(cbmem_console_p); |
| } |
| |
| static inline void current_console_set(struct cbmem_console *new_console_p) |
| { |
| car_set_var(cbmem_console_p, new_console_p); |
| } |
| |
| 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, dropped_chars; |
| u32 cursor = new_cons_p->buffer_cursor; |
| struct cbmem_console *old_cons_p; |
| |
| old_cons_p = current_console(); |
| |
| if (old_cons_p->buffer_cursor < old_cons_p->buffer_size) |
| copy_size = old_cons_p->buffer_cursor; |
| else |
| copy_size = old_cons_p->buffer_size; |
| |
| if (cursor > new_cons_p->buffer_size) |
| copy_size = 0; |
| else if (cursor + copy_size > new_cons_p->buffer_size) |
| copy_size = new_cons_p->buffer_size - cursor; |
| |
| dropped_chars = old_cons_p->buffer_cursor - copy_size; |
| if (dropped_chars) { |
| /* Reserve 80 chars to report overflow, if possible. */ |
| if (copy_size < 80) |
| return; |
| copy_size -= 80; |
| dropped_chars += 80; |
| } |
| |
| memcpy(new_cons_p->buffer_body + cursor, old_cons_p->buffer_body, |
| copy_size); |
| |
| cursor += copy_size; |
| |
| if (dropped_chars) { |
| const char loss_str1[] = "\n\n*** Log truncated, "; |
| const char loss_str2[] = " characters dropped. ***\n\n"; |
| |
| /* |
| * 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 = NULL; |
| |
| #ifndef __PRE_RAM__ |
| cbm_cons_p = cbmem_find(CBMEM_ID_CONSOLE); |
| #endif |
| |
| if (!cbm_cons_p) { |
| 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; |
| } |
| |
| copy_console_buffer(cbm_cons_p); |
| |
| current_console_set(cbm_cons_p); |
| } |
| |
| /* Call cbmemc_reinit() at CAR migration time. */ |
| CAR_MIGRATE(cbmemc_reinit) |