260 lines
7.1 KiB
C
260 lines
7.1 KiB
C
/*
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* Copyright (c) 2015 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "lkboot.h"
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#include <stdio.h>
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#include <debug.h>
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#include <string.h>
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#include <compiler.h>
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#include <err.h>
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#include <assert.h>
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#include <trace.h>
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#include <stdlib.h>
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#include <lib/cbuf.h>
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#include <app/lkboot.h>
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#include <arch/arm/dcc.h>
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#include <arch/mmu.h>
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#include <kernel/mutex.h>
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#include "pdcc.h"
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#define LOCAL_TRACE 0
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static struct pdcc_buffer_descriptor buffer_desc __ALIGNED(256);
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static paddr_t buffer_desc_phys;
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#define DCC_BUFLEN 256
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static uint8_t htod_buffer[DCC_BUFLEN] __ALIGNED(CACHE_LINE);
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static uint8_t dtoh_buffer[DCC_BUFLEN] __ALIGNED(CACHE_LINE);
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static uint htod_index;
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static uint htod_pos;
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static bool dtoh_filled;
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static void send_pdcc_command(uint32_t opcode, uint32_t data)
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{
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uint32_t word;
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word = PDCC_VALID |
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((opcode & 0x7f) << PDCC_OPCODE_SHIFT) |
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(data & 0x00ffffff);
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// XXX may block forever
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LTRACEF("sending 0x%x\n", word);
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arm_dcc_write(&word, 1, INFINITE_TIME);
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}
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static void send_buffer_header(void)
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{
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send_pdcc_command(PDCC_OP_BUF_HEADER, buffer_desc_phys / 256);
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}
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static void send_reset(void)
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{
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send_pdcc_command(PDCC_OP_RESET, 0);
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}
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static void send_out_index_update(uint32_t index)
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{
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send_pdcc_command(PDCC_OP_UPDATE_OUT_INDEX, index);
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}
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static void send_buffer_consumed(void)
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{
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send_pdcc_command(PDCC_OP_CONSUMED_IN, 0);
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}
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#define DCC_PROCESS_RESET 1
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static int dcc_process_opcode(uint32_t word)
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{
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int ret = 0;
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if (word & PDCC_VALID) {
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uint32_t opcode = PDCC_OPCODE(word);
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uint32_t data = PDCC_DATA(word);
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LTRACEF("word 0x%x, opcode 0x%x, data 0x%x\n", word, opcode, data);
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switch (opcode) {
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case PDCC_OP_RESET:
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htod_index = 0;
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htod_pos = 0;
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dtoh_filled = false;
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// try to send the buffer header
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send_buffer_header();
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ret = DCC_PROCESS_RESET;
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break;
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case PDCC_OP_BUF_HEADER:
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// we shouldn't get this
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break;
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case PDCC_OP_UPDATE_OUT_INDEX:
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if (data > DCC_BUFLEN) {
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// out of range
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send_reset();
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} else {
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htod_index = data;
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htod_pos = 0;
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arch_invalidate_cache_range((vaddr_t)htod_buffer, DCC_BUFLEN);
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}
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break;
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case PDCC_OP_CONSUMED_IN:
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arch_invalidate_cache_range((vaddr_t)dtoh_buffer, DCC_BUFLEN);
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dtoh_filled = false;
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break;
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default:
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TRACEF("bad opcode from host 0x%x\n", opcode);
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send_reset();
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}
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}
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return ret;
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}
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static ssize_t dcc_read(void *unused, void *_data, size_t len)
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{
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unsigned char *data = _data;
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size_t pos = 0;
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uint32_t dcc;
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LTRACEF("buf %p, len %zu, htod_pos %u, htod_index %u\n", _data, len, htod_pos, htod_index);
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lk_time_t timeout = 0; // first dcc command should be with no timeout
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while (pos < len) {
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// process a dcc command
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ssize_t err = arm_dcc_read(&dcc, 1, timeout);
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if (err > 0) {
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err = dcc_process_opcode(dcc);
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if (err == DCC_PROCESS_RESET) {
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return ERR_IO;
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}
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}
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// see if there is any data in the incoming buffer
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if (htod_index > 0) {
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size_t tocopy = MIN(htod_index - htod_pos, len - pos);
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memcpy(&data[pos], &htod_buffer[htod_pos], tocopy);
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pos += tocopy;
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htod_pos += tocopy;
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// if we consumed everything, tell the host we're done with the buffer
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if (htod_pos == htod_index) {
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send_buffer_consumed();
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htod_index = 0;
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htod_pos = 0;
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arch_invalidate_cache_range((vaddr_t)htod_buffer, DCC_BUFLEN);
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}
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}
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timeout = 1000;
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}
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return 0;
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}
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static ssize_t dcc_write(void *unused, const void *_data, size_t len)
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{
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const unsigned char *data = _data;
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size_t pos = 0;
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LTRACEF("buf %p, len %zu\n", _data, len);
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while (pos < len) {
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LTRACEF("pos %zu, len %zu, dtoh_filled %d\n", pos, len, dtoh_filled);
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if (!dtoh_filled) {
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// put as much data as we can in the outgoing buffer
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size_t tocopy = MIN(len, DCC_BUFLEN);
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LTRACEF("tocopy %zu\n", tocopy);
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memcpy(dtoh_buffer, data, tocopy);
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arch_clean_cache_range((vaddr_t)dtoh_buffer, DCC_BUFLEN);
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send_out_index_update(tocopy);
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dtoh_filled = true;
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pos += tocopy;
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}
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// process a dcc command
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uint32_t dcc;
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ssize_t err = arm_dcc_read(&dcc, 1, 1000);
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if (err > 0) {
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err = dcc_process_opcode(dcc);
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if (err == DCC_PROCESS_RESET) {
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return ERR_IO;
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}
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}
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}
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return pos;
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}
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lkb_t *lkboot_check_dcc_open(void)
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{
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lkb_t *lkb = NULL;
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// read a dcc op and process it
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{
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uint32_t dcc;
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ssize_t err = arm_dcc_read(&dcc, 1, 0);
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if (err > 0) {
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err = dcc_process_opcode(dcc);
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}
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}
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if (htod_index > 0) {
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// we have data, construct a lkb and return it
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LTRACEF("we have data on dcc, starting command handler\n");
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lkb = lkboot_create_lkb(NULL, dcc_read, dcc_write);
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}
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return lkb;
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}
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void lkboot_dcc_init(void)
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{
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paddr_t pa;
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status_t err;
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buffer_desc.version = PDCC_VERSION;
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err = arch_mmu_query((vaddr_t)htod_buffer, &pa, NULL);
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DEBUG_ASSERT(err == NO_ERROR);
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buffer_desc.htod_buffer_phys = pa;
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buffer_desc.htod_buffer_len = DCC_BUFLEN;
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err = arch_mmu_query((vaddr_t)dtoh_buffer, &pa, NULL);
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DEBUG_ASSERT(err == NO_ERROR);
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buffer_desc.dtoh_buffer_phys = pa;
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buffer_desc.dtoh_buffer_len = DCC_BUFLEN;
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err = arch_mmu_query((vaddr_t)&buffer_desc, &buffer_desc_phys, NULL);
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DEBUG_ASSERT(err == NO_ERROR);
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arch_clean_cache_range((vaddr_t)&buffer_desc, sizeof(buffer_desc));
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}
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