summaryrefslogtreecommitdiffstats
path: root/bootloader/x1000/boot.c
diff options
context:
space:
mode:
Diffstat (limited to 'bootloader/x1000/boot.c')
-rw-r--r--bootloader/x1000/boot.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/bootloader/x1000/boot.c b/bootloader/x1000/boot.c
new file mode 100644
index 0000000000..8b44641604
--- /dev/null
+++ b/bootloader/x1000/boot.c
@@ -0,0 +1,252 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * 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 <ctype.h>
+#include <sys/types.h>
+#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
+}