/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * Copyright (C) 2021-2022 Aidan MacDonald * * 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; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "x1000bootloader.h" #include "core_alloc.h" #include "system.h" #include "kernel.h" #include "power.h" #include "file.h" #include "linuxboot.h" #include "boot-x1000.h" #include #include #if defined(EROS_QN) # include "lcd-x1000.c" # include "backlight-target.h" #endif void boot_rockbox(void) { size_t length; int handle = load_rockbox(BOOTFILE, &length); if(handle < 0) return; gui_shutdown(); x1000_boot_rockbox(core_get_data(handle), length); } void shutdown(void) { splashf(HZ, "Shutting down"); power_off(); while(1); } void reboot(void) { splashf(HZ, "Rebooting"); system_reboot(); while(1); } /* * boot_linux() is intended for mainline kernels, and as such it * should not need any major target-specific modifications. */ static int read_linux_args(const char* filename) { if(check_disk(false) != DISK_PRESENT) return -1; int ret; size_t max_size; int handle = core_alloc_maximum(&max_size, &buflib_ops_locked); if(handle <= 0) { splashf(5*HZ, "Out of memory"); return -2; } int fd = open(filename, O_RDONLY); if(fd < 0) { splashf(5*HZ, "Can't open args file\n%s", filename); ret = -3; goto err_free; } /* this isn't 100% correct but will be good enough */ off_t fsize = filesize(fd); if(fsize < 0 || fsize+1 > (off_t)max_size) { splashf(5*HZ, "Arguments too long"); ret = -4; goto err_close; } char* buf = core_get_data(handle); core_shrink(handle, buf, fsize+1); ssize_t rdres = read(fd, buf, fsize); close(fd); if(rdres != (ssize_t)fsize) { splashf(5*HZ, "Can't read args file"); ret = -5; goto err_free; } /* append a null terminator */ char* end = buf + fsize; *end = 0; /* change all newlines, etc, to spaces */ for(; buf != end; ++buf) if(isspace(*buf)) *buf = ' '; return handle; err_close: close(fd); err_free: core_free(handle); return ret; } /* * Provisional linux loading function: kernel is at "/uImage", * contents of "/linux_cmdline.txt" are used as kernel arguments. */ void boot_linux(void) { struct uimage_header uh; size_t img_length; int handle = load_uimage_file("/uImage", &uh, &img_length); if(handle < 0) return; int args_handle = read_linux_args("/linux_cmdline.txt"); if(args_handle < 0) { core_free(handle); return; } x1000_boot_linux(core_get_data(handle), img_length, (void*)uimage_get_load(&uh), (void*)uimage_get_ep(&uh), core_get_data(args_handle)); } /* * WARNING: Original firmware can be finicky. * Be careful when modifying this code. */ #if defined(FIIO_M3K) || defined(SHANLING_Q1) uint32_t saved_kernel_entry __attribute__((section(".idata"))); void kernel_thunk(long, long, long, long) __attribute__((section(".icode"))); void kernel_thunk(long a0, long a1, long a2, long a3) { /* cache flush */ commit_discard_idcache(); /* now we can jump to the kernel */ typedef void(*entry_fn)(long, long, long, long); entry_fn fn = (entry_fn)saved_kernel_entry; fn(a0, a1, a2, a3); while(1); } static void patch_stub_call(void* patch_addr) { uint32_t* code = patch_addr; uint32_t stub_addr = (uint32_t)(void*)kernel_thunk; /* generate call to stub */ code[0] = 0x3c190000 | (stub_addr >> 16); /* lui t9, stub_hi */ code[1] = 0x37390000 | (stub_addr & 0xffff); /* ori t9, t9, stub_lo */ code[2] = 0x0320f809; /* jalr t9 */ code[3] = 0x00000000; /* nop */ } #endif static __attribute__((unused)) void boot_of_helper(uint32_t addr, uint32_t flash_size, const char* args) { struct uimage_header uh; size_t img_length; int handle = load_uimage_flash(addr, flash_size, &uh, &img_length); if(handle < 0) return; #if defined(FIIO_M3K) || defined(SHANLING_Q1) /* Fix for targets that use self-extracting kernel images */ void* jump_addr = core_get_data(handle); uint32_t entry_addr = mips_linux_stub_get_entry(&jump_addr, img_length); if(entry_addr >= 0xa0000000 || entry_addr < 0x80000000) { splashf(5*HZ, "Kernel patch failed\nPlease send bugreport"); return; } saved_kernel_entry = entry_addr; patch_stub_call(jump_addr); #endif gui_shutdown(); /* The Eros Q needs the LCD initialized in the bootloader */ #if defined(EROS_QN) /* enable LCD if it's not yet on, but keep the backlight off to avoid a white flash */ init_lcd(); backlight_hw_off(); /* TODO: this doesn't work for some reason */ //lcd_clear_display(); //lcd_update(); //lcd_wait_frame(); /* disable irq and dma */ lcd_enable(false); /* set up LCD in a config compatible with OF */ lcd_tgt_enable_of(1); #endif x1000_dualboot_load_pdma_fw(); x1000_dualboot_cleanup(); x1000_dualboot_init_clocktree(); x1000_dualboot_init_uart2(); x1000_boot_linux(core_get_data(handle), img_length, (void*)uimage_get_load(&uh), (void*)uimage_get_ep(&uh), args); } void boot_of_player(void) { #if defined(OF_PLAYER_ADDR) boot_of_helper(OF_PLAYER_ADDR, OF_PLAYER_LENGTH, OF_PLAYER_ARGS); #else splashf(HZ, "Not supported"); #endif } void boot_of_recovery(void) { #if defined(OF_RECOVERY_ADDR) boot_of_helper(OF_RECOVERY_ADDR, OF_RECOVERY_LENGTH, OF_RECOVERY_ARGS); #else splashf(HZ, "Not supported"); #endif }