/* * 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 <console/cbmem_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 CONFIG_CONSOLE_CBMEM_BUFFER_SIZE #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)