263 lines
6.1 KiB
C
263 lines
6.1 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 "../mta1_mkdf_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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// In RAM + above the stack (0x40010000)
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#define APP_RAM_ADDR (MTA1_MKDF_RAM_BASE + 0x10000)
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#define APP_MAX_SIZE 65536
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// clang-format off
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static volatile uint32_t *uds = (volatile uint32_t *)MTA1_MKDF_MMIO_UDS_FIRST;
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static volatile uint32_t *switch_app = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_SWITCH_APP;
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static volatile uint32_t *name0 = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_NAME0;
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static volatile uint32_t *name1 = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_NAME1;
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static volatile uint32_t *ver = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_VERSION;
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static volatile uint32_t *cdi = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_CDI_FIRST;
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static volatile uint32_t *app_addr = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_APP_ADDR;
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static volatile uint32_t *app_size = (volatile uint32_t *)MTA1_MKDF_MMIO_MTA1_APP_SIZE;
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#define LED_RED (1 << MTA1_MKDF_MMIO_MTA1_LED_R_BIT)
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#define LED_GREEN (1 << MTA1_MKDF_MMIO_MTA1_LED_G_BIT)
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#define LED_BLUE (1 << MTA1_MKDF_MMIO_MTA1_LED_B_BIT)
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static void print_hw_version(uint32_t name0, uint32_t name1, uint32_t ver)
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{
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puts("Hello, I'm ");
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putc(name0 >> 24);
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putc(name0 >> 16);
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putc(name0 >> 8);
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putc(name0);
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putc('-');
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putc(name1 >> 24);
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putc(name1 >> 16);
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putc(name1 >> 8);
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putc(name1);
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putc(' ');
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putinthex(ver);
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lf();
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}
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// clang-format on
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static void print_digest(uint8_t *md)
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{
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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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puthex(md[i + 8 * j]);
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}
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lf();
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}
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lf();
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}
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int main()
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{
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uint32_t local_name0 = *name0;
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uint32_t local_name1 = *name1;
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uint32_t local_ver = *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 *)APP_RAM_ADDR;
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int left = 0; // Bytes left to read
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int nbytes = 0; // Bytes to write to memory
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uint32_t local_app_size = 0;
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uint8_t in;
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uint8_t digest[32];
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print_hw_version(local_name0, local_name1, local_ver);
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for (;;) {
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// blocking; fw flashing white while waiting for cmd
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in = readbyte_ledflash(LED_RED | LED_BLUE | LED_GREEN, 500000);
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if (parseframe(in, &hdr) == -1) {
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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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// Read firmware command: Blocks!
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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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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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puts("request: 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, (uint8_t *)&local_name0, 4);
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memcpy(rsp + 4, (uint8_t *)&local_name1, 4);
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memcpy(rsp + 8, (uint8_t *)&local_ver, 4);
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fwreply(hdr, FW_RSP_NAME_VERSION, rsp);
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break;
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case FW_CMD_LOAD_APP_SIZE:
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puts("request: load-app-size\n");
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if (hdr.len != 32) {
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// Bad length
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_LOAD_APP_SIZE, rsp);
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break;
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}
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// cmd[1..4] contains the size.
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local_app_size = cmd[1] + (cmd[2] << 8) +
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(cmd[3] << 16) + (cmd[4] << 24);
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puts("app size: ");
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putinthex(local_app_size);
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lf();
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if (local_app_size > APP_MAX_SIZE) {
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_LOAD_APP_SIZE, rsp);
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break;
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}
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*app_size = local_app_size;
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*app_addr = 0;
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// Reset where to start loading the program
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loadaddr = (uint8_t *)APP_RAM_ADDR;
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left = *app_size;
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rsp[0] = STATUS_OK;
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fwreply(hdr, FW_RSP_LOAD_APP_SIZE, rsp);
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break;
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case FW_CMD_LOAD_APP_DATA:
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puts("request: load-app-data\n");
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if (hdr.len != 128 || *app_size == 0) {
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// Bad length of this command or bad app size -
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// they need to call FW_CMD_LOAD_APP_SIZE first
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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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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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uint8_t scratch[64];
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puts("Fully loaded ");
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putinthex(*app_size);
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lf();
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*app_addr = APP_RAM_ADDR;
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// Get the Blake2S digest of the app - store it
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// for later queries
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blake2s(digest, 32, NULL, 0,
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(const void *)*app_addr, *app_size);
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print_digest(digest);
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// CDI = hash(uds, hash(app))
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uint32_t local_cdi[8];
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// Only word aligned access to UDS
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wordcpy(scratch, (void *)uds, 8);
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memcpy(scratch + 32, digest, 32);
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blake2s((void *)local_cdi, 32, NULL, 0,
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(const void *)scratch, 64);
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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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rsp[0] = STATUS_OK;
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fwreply(hdr, FW_RSP_LOAD_APP_DATA, rsp);
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break;
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case FW_CMD_RUN_APP:
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puts("request: run-app\n");
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if (hdr.len != 1) {
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// Bad length
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_RUN_APP, rsp);
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break;
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}
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if (*app_size > 0 && *app_addr != 0) {
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rsp[0] = STATUS_OK;
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fwreply(hdr, FW_RSP_RUN_APP, rsp);
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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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puts("Jumping to ");
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putinthex(*app_addr);
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lf();
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// clang-format off
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asm volatile(
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"li a0, 0x40000000;" // MTA1_MKDF_RAM_BASE
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"li a1, 0x40010000;"
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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 MTA1_MKDF_MMIO_MTA1_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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}
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rsp[0] = STATUS_BAD;
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fwreply(hdr, FW_RSP_RUN_APP, rsp);
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break;
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case FW_CMD_GET_APP_DIGEST:
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puts("request: get-app-digest\n");
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memcpy(rsp, &digest, 32);
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fwreply(hdr, FW_RSP_GET_APP_DIGEST, rsp);
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break;
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default:
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puts("Received unknown firmware command: 0x");
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puthex(cmd[0]);
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lf();
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}
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}
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return (int)0xcafebabe;
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}
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