mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2024-07-03 10:01:40 +00:00
370 lines
8.4 KiB
C
370 lines
8.4 KiB
C
/*
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* Copyright (C) 2022 - Tillitis AB
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#include "../tk1_mem.h"
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#include "blake2s/blake2s.h"
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#include "lib.h"
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#include "proto.h"
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#include "types.h"
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// clang-format off
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static volatile uint32_t *uds = (volatile uint32_t *)TK1_MMIO_UDS_FIRST;
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static volatile uint32_t *switch_app = (volatile uint32_t *)TK1_MMIO_TK1_SWITCH_APP;
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static volatile uint32_t *name0 = (volatile uint32_t *)TK1_MMIO_TK1_NAME0;
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static volatile uint32_t *name1 = (volatile uint32_t *)TK1_MMIO_TK1_NAME1;
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static volatile uint32_t *ver = (volatile uint32_t *)TK1_MMIO_TK1_VERSION;
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static volatile uint32_t *udi = (volatile uint32_t *)TK1_MMIO_TK1_UDI_FIRST;
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static volatile uint32_t *cdi = (volatile uint32_t *)TK1_MMIO_TK1_CDI_FIRST;
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static volatile uint32_t *app_addr = (volatile uint32_t *)TK1_MMIO_TK1_APP_ADDR;
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static volatile uint32_t *app_size = (volatile uint32_t *)TK1_MMIO_TK1_APP_SIZE;
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static volatile uint8_t *fw_ram = (volatile uint8_t *)TK1_MMIO_FW_RAM_BASE;
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static volatile uint32_t *led = (volatile uint32_t *)TK1_MMIO_TK1_LED;
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#define LED_RED (1 << TK1_MMIO_TK1_LED_R_BIT)
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#define LED_GREEN (1 << TK1_MMIO_TK1_LED_G_BIT)
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#define LED_BLUE (1 << TK1_MMIO_TK1_LED_B_BIT)
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#define LED_WHITE (LED_RED | LED_GREEN | LED_BLUE)
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// clang-format on
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struct namever {
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char name0[4];
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char name1[4];
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uint32_t version;
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};
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static void print_hw_version(struct namever namever)
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{
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htif_puts("Hello, I'm ");
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htif_hexdump((uint8_t *)&namever.name0, 4);
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htif_putc(namever.name0[0]);
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htif_putc(namever.name0[1]);
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htif_putc(namever.name0[2]);
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htif_putc(namever.name0[3]);
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htif_putc('-');
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htif_putc(namever.name1[0]);
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htif_putc(namever.name1[1]);
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htif_putc(namever.name1[2]);
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htif_putc(namever.name1[3]);
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htif_putc(':');
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htif_putinthex(namever.version);
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htif_lf();
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}
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static struct namever get_hw_version(uint32_t name0, uint32_t name1,
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uint32_t ver)
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{
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struct namever namever;
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htif_hexdump((uint8_t *)&name0, 4);
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htif_putinthex(name0);
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htif_lf();
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namever.name0[0] = name0 >> 24;
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namever.name0[1] = name0 >> 16;
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namever.name0[2] = name0 >> 8;
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namever.name0[3] = name0;
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namever.name1[0] = name1 >> 24;
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namever.name1[1] = name1 >> 16;
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namever.name1[2] = name1 >> 8;
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namever.name1[3] = name1;
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namever.version = ver;
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return namever;
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}
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static void print_digest(uint8_t *md)
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{
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htif_puts("The app digest:\n");
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for (int j = 0; j < 4; j++) {
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for (int i = 0; i < 8; i++) {
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htif_puthex(md[i + 8 * j]);
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}
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htif_lf();
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}
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htif_lf();
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}
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// CDI = blake2s(uds, blake2s(app), uss)
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static void compute_cdi(uint8_t digest[32], uint8_t use_uss, uint8_t uss[32])
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{
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uint32_t local_cdi[8];
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int len;
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// To protect UDS we use a special firmware-only RAM for both
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// the in parameter to blake2s and the blake2s context.
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// Only word aligned access to UDS
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wordcpy((void *)fw_ram, (void *)uds, 8);
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memcpy((void *)fw_ram + 32, digest, 32);
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if (use_uss != 0) {
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memcpy((void *)fw_ram + 64, uss, 32);
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len = 96;
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} else {
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len = 64;
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}
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blake2s_ctx *secure_ctx = (blake2s_ctx *)(fw_ram + len);
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blake2s((void *)local_cdi, 32, NULL, 0, (const void *)fw_ram, len,
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secure_ctx);
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// Write over the firmware-only RAM
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memset((void *)fw_ram, 0, TK1_MMIO_FW_RAM_SIZE);
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// Only word aligned access to CDI
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wordcpy((void *)cdi, (void *)local_cdi, 8);
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}
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void forever_redflash()
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{
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int led_on = 0;
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for (;;) {
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*led = led_on ? LED_RED : 0;
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for (volatile int i = 0; i < 800000; i++) {
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}
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led_on = !led_on;
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}
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}
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enum state {
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FW_STATE_INITIAL,
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FW_STATE_INIT_LOADING,
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FW_STATE_LOADING,
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FW_STATE_RUN
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};
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int main()
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{
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struct namever namever = get_hw_version(*name0, *name1, *ver);
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struct frame_header hdr; // Used in both directions
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uint8_t cmd[CMDLEN_MAXBYTES];
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uint8_t rsp[CMDLEN_MAXBYTES];
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uint8_t *loadaddr = (uint8_t *)TK1_APP_ADDR;
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int left = 0; // Bytes left to receive
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uint8_t use_uss = FALSE;
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uint8_t uss[32] = {0};
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uint8_t digest[32] = {0};
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enum state state = FW_STATE_INITIAL;
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print_hw_version(namever);
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for (;;) {
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switch (state) {
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case FW_STATE_INITIAL:
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break;
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case FW_STATE_INIT_LOADING:
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*app_addr = 0;
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left = *app_size;
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// Reset where to start loading the program
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loadaddr = (uint8_t *)TK1_APP_ADDR;
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break;
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case FW_STATE_LOADING:
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break;
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case FW_STATE_RUN:
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*app_addr = TK1_APP_ADDR;
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// CDI = hash(uds, hash(app), uss)
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compute_cdi(digest, use_uss, uss);
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// Flip over to application mode
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*switch_app = 1;
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// Jump to app - doesn't return
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// First clears memory of firmware remains
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htif_puts("Jumping to ");
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htif_putinthex(*app_addr);
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htif_lf();
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// clang-format off
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asm volatile(
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// Clear the stack
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"li a0, 0x40000000;" // TK1_RAM_BASE
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"li a1, 0x40007000;" // TK1_APP_ADDR
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"loop:;"
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"sw zero, 0(a0);"
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"addi a0, a0, 4;"
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"blt a0, a1, loop;"
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// Get value at TK1_MMIO_TK1_APP_ADDR
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"lui a0,0xff000;"
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"lw a0,0x030(a0);"
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"jalr x0,0(a0);"
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::: "memory");
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// clang-format on
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break; // This is never reached!
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default:
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htif_puts("Unknown firmware state 0x");
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htif_puthex(state);
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htif_lf();
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forever_redflash();
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break; // Not reached
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}
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uint8_t in;
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if (state == FW_STATE_LOADING) {
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*led = LED_WHITE;
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in = readbyte();
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} else {
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in = readbyte_ledflash(LED_WHITE, 800000);
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}
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if (parseframe(in, &hdr) == -1) {
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htif_puts("Couldn't parse header\n");
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continue;
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}
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memset(cmd, 0, CMDLEN_MAXBYTES);
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// Now we know the size of the cmd frame, read it all
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read(cmd, hdr.len);
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// Is it for us?
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if (hdr.endpoint != DST_FW) {
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htif_puts("Message not meant for us\n");
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continue;
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}
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// Reset response buffer
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memset(rsp, 0, CMDLEN_MAXBYTES);
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// Min length is 1 byte so this should always be here
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switch (cmd[0]) {
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case FW_CMD_NAME_VERSION:
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htif_puts("cmd: name-version\n");
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if (hdr.len != 1) {
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// Bad length - give them an empty response
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fwreply(hdr, FW_RSP_NAME_VERSION, rsp);
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break;
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}
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memcpy(rsp, &namever.name0, 4);
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memcpy(rsp + 4, &namever.name1, 4);
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memcpy(rsp + 8, &namever.version, 4);
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fwreply(hdr, FW_RSP_NAME_VERSION, rsp);
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// state unchanged
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break;
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case FW_CMD_GET_UDI:
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htif_puts("cmd: get-udi\n");
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if (hdr.len != 1) {
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// Bad cmd length
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_GET_UDI, rsp);
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break;
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}
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rsp[0] = STATUS_OK;
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uint32_t udi_words[2];
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wordcpy(udi_words, (void *)udi, 2);
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memcpy(rsp + 1, udi_words, 2 * 4);
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fwreply(hdr, FW_RSP_GET_UDI, rsp);
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// state unchanged
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break;
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case FW_CMD_LOAD_APP:
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htif_puts("cmd: load-app(size, uss)\n");
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if (hdr.len != 128) {
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// Bad length
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_LOAD_APP, rsp);
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break;
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}
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// cmd[1..4] contains the size.
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uint32_t local_app_size = cmd[1] + (cmd[2] << 8) +
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(cmd[3] << 16) +
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(cmd[4] << 24);
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htif_puts("app size: ");
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htif_putinthex(local_app_size);
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htif_lf();
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if (local_app_size == 0 ||
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local_app_size > TK1_APP_MAX_SIZE) {
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_LOAD_APP, rsp);
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break;
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}
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*app_size = local_app_size;
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// Do we have a USS at all?
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if (cmd[5] != 0) {
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// Yes
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use_uss = TRUE;
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memcpy(uss, cmd + 6, 32);
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} else {
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use_uss = FALSE;
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}
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rsp[0] = STATUS_OK;
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fwreply(hdr, FW_RSP_LOAD_APP, rsp);
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state = FW_STATE_INIT_LOADING;
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break;
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case FW_CMD_LOAD_APP_DATA:
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htif_puts("cmd: load-app-data\n");
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if (hdr.len != 128 || (state != FW_STATE_INIT_LOADING &&
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state != FW_STATE_LOADING)) {
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// Bad cmd length or state
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_LOAD_APP_DATA, rsp);
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break;
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}
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int nbytes;
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if (left > 127) {
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nbytes = 127;
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} else {
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nbytes = left;
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}
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memcpy(loadaddr, cmd + 1, nbytes);
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loadaddr += nbytes;
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left -= nbytes;
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if (left == 0) {
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htif_puts("Fully loaded ");
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htif_putinthex(*app_size);
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htif_lf();
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// Compute Blake2S digest of the app, storing
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// it for FW_STATE_RUN
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blake2s_ctx ctx;
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blake2s(digest, 32, NULL, 0,
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(const void *)TK1_APP_ADDR, *app_size,
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&ctx);
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print_digest(digest);
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// And return the digest in final response
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rsp[0] = STATUS_OK;
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memcpy(&rsp[1], &digest, 32);
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fwreply(hdr, FW_RSP_LOAD_APP_DATA_READY, rsp);
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state = FW_STATE_RUN;
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break;
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}
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rsp[0] = STATUS_OK;
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fwreply(hdr, FW_RSP_LOAD_APP_DATA, rsp);
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state = FW_STATE_LOADING;
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break;
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default:
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htif_puts("Got unknown firmware cmd: 0x");
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htif_puthex(cmd[0]);
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htif_lf();
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}
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}
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return (int)0xcafebabe;
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}
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