Atmosphere/fusee/fusee-primary/src/main.c

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/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
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#include "utils.h"
#include "exception_handlers.h"
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#include "panic.h"
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#include "hwinit.h"
#include "di.h"
#include "timers.h"
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#include "fs_utils.h"
#include "stage2.h"
#include "chainloader.h"
#include "sdmmc/sdmmc.h"
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#include "lib/fatfs/ff.h"
#include "lib/log.h"
#include "lib/vsprintf.h"
#include "lib/ini.h"
#include "display/video_fb.h"
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extern void (*__program_exit_callback)(int rc);
static void *g_framebuffer;
static char g_bct0_buffer[BCTO_MAX_SIZE];
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#define CONFIG_LOG_LEVEL_KEY "log_level"
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#define DEFAULT_BCT0_FOR_DEBUG \
"BCT0\n"\
"[stage1]\n"\
"stage2_path = atmosphere/fusee-secondary.bin\n"\
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"stage2_addr = 0xF0000000\n"\
"stage2_entrypoint = 0xF0000000\n"
static const char *load_config(void) {
if (!read_from_file(g_bct0_buffer, BCTO_MAX_SIZE, "atmosphere/BCT.ini")) {
print(SCREEN_LOG_LEVEL_DEBUG, "Failed to read BCT0 from SD!\n");
print(SCREEN_LOG_LEVEL_DEBUG, "Using default BCT0!\n");
memcpy(g_bct0_buffer, DEFAULT_BCT0_FOR_DEBUG, sizeof(DEFAULT_BCT0_FOR_DEBUG));
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}
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if (memcmp(g_bct0_buffer, "BCT0", 4) != 0) {
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fatal_error("Unexpected magic in BCT.ini!\n");
}
/* Return pointer to first line of the ini. */
const char *bct0 = g_bct0_buffer;
while (*bct0 && *bct0 != '\n') {
bct0++;
}
if (!bct0) {
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fatal_error("BCT.ini has no newline!\n");
}
return bct0;
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}
static int config_ini_handler(void *user, const char *section, const char *name, const char *value) {
if (strcmp(section, "config") == 0) {
if (strcmp(name, CONFIG_LOG_LEVEL_KEY) == 0) {
ScreenLogLevel *config_log_level = (ScreenLogLevel *)user;
int log_level = 0;
sscanf(value, "%d", &log_level);
*config_log_level = (ScreenLogLevel)log_level;
} else {
return 0;
}
} else {
return 0;
}
return 1;
}
static void setup_env(void) {
g_framebuffer = (void *)0xC0000000;
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/* Initialize hardware. */
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nx_hwinit();
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/* Check for panics. */
check_and_display_panic();
/* Zero-fill the framebuffer and register it as printk provider. */
video_init(g_framebuffer);
/* Initialize the display. */
display_init();
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/* Set the framebuffer. */
display_init_framebuffer(g_framebuffer);
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/* Turn on the backlight after initializing the lfb */
/* to avoid flickering. */
display_backlight(true);
/* Set up the exception handlers. */
setup_exception_handlers();
/* Mount the SD card. */
mount_sd();
}
static void cleanup_env(void) {
/* Unmount the SD card. */
unmount_sd();
display_backlight(false);
display_end();
}
static void exit_callback(int rc) {
(void)rc;
relocate_and_chainload();
}
int main(void) {
const char *bct0;
const char *stage2_path;
stage2_args_t *stage2_args;
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uint32_t stage2_version = 0;
ScreenLogLevel log_level = SCREEN_LOG_LEVEL_MANDATORY;
/* Override the global logging level. */
log_set_log_level(log_level);
/* Initialize the display, console, etc. */
setup_env();
/* Load the BCT0 configuration ini off of the SD. */
bct0 = load_config();
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/* Extract the logging level from the BCT.ini file. */
if (ini_parse_string(bct0, config_ini_handler, &log_level) < 0) {
fatal_error("Failed to parse BCT.ini!\n");
}
/* Say hello. */
print(SCREEN_LOG_LEVEL_MANDATORY, "Welcome to Atmosph\xe8re Fus\xe9" "e!\n");
print(SCREEN_LOG_LEVEL_DEBUG, "Using color linear framebuffer at 0x%p!\n", g_framebuffer);
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/* Load the loader payload into DRAM. */
load_stage2(bct0);
/* Setup argument data. */
stage2_path = stage2_get_program_path();
strcpy(g_chainloader_arg_data, stage2_path);
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stage2_args = (stage2_args_t *)(g_chainloader_arg_data + strlen(stage2_path) + 1); /* May be unaligned. */
memcpy(&stage2_args->version, &stage2_version, 4);
memcpy(&stage2_args->log_level, &log_level, sizeof(log_level));
stage2_args->display_initialized = false;
strcpy(stage2_args->bct0, bct0);
g_chainloader_argc = 2;
/* Wait a while. */
mdelay(1000);
/* Deinitialize the display, console, etc. */
cleanup_env();
/* Finally, after the cleanup routines (__libc_fini_array, etc.) are called, jump to Stage2. */
__program_exit_callback = exit_callback;
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return 0;
}