134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "common.h"
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#include "debug_printf.h"
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#include "printf.h"
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#include "registers.h"
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#include "setup.h"
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#include "signed_header.h"
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#include "system.h"
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#include "trng.h"
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#include "uart.h"
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/*
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* This file is a proof of concept stub which will be extended and split into
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* appropriate pieces shortly, when full blown support for cr50 bootrom is
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* introduced.
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*/
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uint32_t sleep_mask;
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timestamp_t get_time(void)
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{
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timestamp_t ret;
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ret.val = 0;
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return ret;
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}
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static int panic_txchar(void *context, int c)
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{
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if (c == '\n')
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panic_txchar(context, '\r');
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/* Wait for space in transmit FIFO */
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while (!uart_tx_ready())
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;
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/* Write the character directly to the transmit FIFO */
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uart_write_char(c);
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return 0;
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}
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void panic_puts(const char *outstr)
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{
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/* Put all characters in the output buffer */
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while (*outstr)
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panic_txchar(NULL, *outstr++);
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}
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void panic_printf(const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vfnprintf(panic_txchar, NULL, format, args);
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va_end(args);
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}
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/* Returns 1 if version a is newer, 0 otherwise. */
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int is_newer_than(const struct SignedHeader *a, const struct SignedHeader *b)
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{
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if (a->epoch_ != b->epoch_)
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return a->epoch_ > b->epoch_;
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if (a->major_ != b->major_)
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return a->major_ > b->major_;
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if (a->minor_ != b->minor_)
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return a->minor_ > b->minor_;
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if (a->timestamp_ != b->timestamp_)
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return a->timestamp_ > b->timestamp_;
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return 1; /* All else being equal, consider A to be newer. */
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}
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int main(void)
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{
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const struct SignedHeader *a, *b, *first, *second;
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init_trng();
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uart_init();
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debug_printf("\n\n%s bootloader, %8u_%u@%u\n",
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STRINGIFY(BOARD), GREG32(SWDP, BUILD_DATE),
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GREG32(SWDP, BUILD_TIME), GREG32(SWDP, P4_LAST_SYNC));
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unlockFlashForRW();
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a = (const struct SignedHeader *)(CONFIG_PROGRAM_MEMORY_BASE +
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CONFIG_RW_MEM_OFF);
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b = (const struct SignedHeader *)(CONFIG_PROGRAM_MEMORY_BASE +
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CONFIG_RW_B_MEM_OFF);
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/* Default to loading the older version first.
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* Run from bank a if the versions are equal.
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*/
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if (is_newer_than(a, b)) {
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first = a;
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second = b;
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} else {
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first = b;
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second = a;
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}
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if (GREG32(PMU, PWRDN_SCRATCH30) == 0xcafebabe) {
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/* Launch from the alternate bank first.
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* This knob will be used to attempt to load the newer version
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* after an update and to run from bank b in the face of flash
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* integrity issues.
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*/
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debug_printf("PWRDN_SCRATCH30 set to magic value\n");
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GREG32(PMU, PWRDN_SCRATCH30) = 0x0;
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a = first;
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first = second;
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second = a;
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}
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tryLaunch((uint32_t)first, CONFIG_RW_SIZE);
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debug_printf("Failed to launch.\n");
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debug_printf("Attempting to load the alternate image.\n");
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tryLaunch((uint32_t)second, CONFIG_RW_SIZE);
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debug_printf("No valid image found, not sure what to do...\n");
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/* TODO: Some applications might want to reboot instead. */
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halt();
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return 1;
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}
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void panic_reboot(void)
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{
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panic_puts("\n\nRebooting...\n");
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system_reset(0);
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}
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void interrupt_disable(void)
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{
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asm("cpsid i");
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}
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