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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007,2008 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* Copyright (C) 2009 SoftPLC Corporation *
* http://softplc.com *
* dick@softplc.com *
* *
* Copyright (C) 2009 Zachary T Welch *
* zw@superlucidity.net *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <jtag/jtag.h>
#include <transport/transport.h>
#include "commands.h"
struct cmd_queue_page {
struct cmd_queue_page *next;
void *address;
size_t used;
};
#define CMD_QUEUE_PAGE_SIZE (1024 * 1024)
static struct cmd_queue_page *cmd_queue_pages;
static struct cmd_queue_page *cmd_queue_pages_tail;
static struct jtag_command *jtag_command_queue;
static struct jtag_command **next_command_pointer = &jtag_command_queue;
void jtag_queue_command(struct jtag_command *cmd)
{
if (!transport_is_jtag()) {
/*
* FIXME: This should not happen!
* There could be old code that queues jtag commands with non jtag interfaces so, for
* the moment simply highlight it by log an error.
* We should fix it quitting with assert(0) because it is an internal error, or returning
* an error after call to jtag_command_queue_reset() to free the jtag queue and avoid
* memory leaks.
* The fix can be applied immediately after next release (v0.11.0 ?)
*/
LOG_ERROR("JTAG API jtag_queue_command() called on non JTAG interface");
}
/* this command goes on the end, so ensure the queue terminates */
cmd->next = NULL;
struct jtag_command **last_cmd = next_command_pointer;
assert(last_cmd);
assert(!*last_cmd);
*last_cmd = cmd;
/* store location where the next command pointer will be stored */
next_command_pointer = &cmd->next;
}
void *cmd_queue_alloc(size_t size)
{
struct cmd_queue_page **p_page = &cmd_queue_pages;
int offset;
uint8_t *t;
/*
* WARNING:
* We align/round the *SIZE* per below
* so that all pointers returned by
* this function are reasonably well
* aligned.
*
* If we did not, then an "odd-length" request would cause the
* *next* allocation to be at an *odd* address, and because
* this function has the same type of api as malloc() - we
* must also return pointers that have the same type of
* alignment.
*
* What I do not/have is a reasonable portable means
* to align by...
*
* The solution here, is based on these suggestions.
* http://gcc.gnu.org/ml/gcc-help/2008-12/msg00041.html
*
*/
union worse_case_align {
int i;
long l;
float f;
void *v;
};
#define ALIGN_SIZE (sizeof(union worse_case_align))
/* The alignment process. */
size = (size + ALIGN_SIZE - 1) & (~(ALIGN_SIZE - 1));
/* Done... */
if (*p_page) {
p_page = &cmd_queue_pages_tail;
if (CMD_QUEUE_PAGE_SIZE < (*p_page)->used + size)
p_page = &((*p_page)->next);
}
if (!*p_page) {
*p_page = malloc(sizeof(struct cmd_queue_page));
(*p_page)->used = 0;
size_t alloc_size = (size < CMD_QUEUE_PAGE_SIZE) ?
CMD_QUEUE_PAGE_SIZE : size;
(*p_page)->address = malloc(alloc_size);
(*p_page)->next = NULL;
cmd_queue_pages_tail = *p_page;
}
offset = (*p_page)->used;
(*p_page)->used += size;
t = (*p_page)->address;
return t + offset;
}
static void cmd_queue_free(void)
{
struct cmd_queue_page *page = cmd_queue_pages;
while (page) {
struct cmd_queue_page *last = page;
free(page->address);
page = page->next;
free(last);
}
cmd_queue_pages = NULL;
cmd_queue_pages_tail = NULL;
}
void jtag_command_queue_reset(void)
{
cmd_queue_free();
jtag_command_queue = NULL;
next_command_pointer = &jtag_command_queue;
}
struct jtag_command *jtag_command_queue_get(void)
{
return jtag_command_queue;
}
/**
* Copy a struct scan_field for insertion into the queue.
*
* This allocates a new copy of out_value using cmd_queue_alloc.
*/
void jtag_scan_field_clone(struct scan_field *dst, const struct scan_field *src)
{
dst->num_bits = src->num_bits;
dst->out_value = buf_cpy(src->out_value, cmd_queue_alloc(DIV_ROUND_UP(src->num_bits, 8)), src->num_bits);
dst->in_value = src->in_value;
}
enum scan_type jtag_scan_type(const struct scan_command *cmd)
{
int type = 0;
for (unsigned int i = 0; i < cmd->num_fields; i++) {
if (cmd->fields[i].in_value)
type |= SCAN_IN;
if (cmd->fields[i].out_value)
type |= SCAN_OUT;
}
return type;
}
unsigned int jtag_scan_size(const struct scan_command *cmd)
{
unsigned int bit_count = 0;
/* count bits in scan command */
for (unsigned int i = 0; i < cmd->num_fields; i++)
bit_count += cmd->fields[i].num_bits;
return bit_count;
}
int jtag_build_buffer(const struct scan_command *cmd, uint8_t **buffer)
{
unsigned int bit_count = jtag_scan_size(cmd);
*buffer = calloc(1, DIV_ROUND_UP(bit_count, 8));
bit_count = 0;
LOG_DEBUG_IO("%s num_fields: %u",
cmd->ir_scan ? "IRSCAN" : "DRSCAN",
cmd->num_fields);
for (unsigned int i = 0; i < cmd->num_fields; i++) {
if (cmd->fields[i].out_value) {
if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO)) {
char *char_buf = buf_to_hex_str(cmd->fields[i].out_value,
(cmd->fields[i].num_bits > DEBUG_JTAG_IOZ)
? DEBUG_JTAG_IOZ
: cmd->fields[i].num_bits);
LOG_DEBUG("fields[%u].out_value[%u]: 0x%s", i,
cmd->fields[i].num_bits, char_buf);
free(char_buf);
}
buf_set_buf(cmd->fields[i].out_value, 0, *buffer,
bit_count, cmd->fields[i].num_bits);
} else {
LOG_DEBUG_IO("fields[%u].out_value[%u]: NULL",
i, cmd->fields[i].num_bits);
}
bit_count += cmd->fields[i].num_bits;
}
/*LOG_DEBUG_IO("bit_count totalling: %i", bit_count); */
return bit_count;
}
int jtag_read_buffer(uint8_t *buffer, const struct scan_command *cmd)
{
int bit_count = 0;
int retval;
/* we return ERROR_OK, unless a check fails, or a handler reports a problem */
retval = ERROR_OK;
for (unsigned int i = 0; i < cmd->num_fields; i++) {
/* if neither in_value nor in_handler
* are specified we don't have to examine this field
*/
if (cmd->fields[i].in_value) {
const unsigned int num_bits = cmd->fields[i].num_bits;
uint8_t *captured = buf_set_buf(buffer, bit_count,
malloc(DIV_ROUND_UP(num_bits, 8)), 0, num_bits);
if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO)) {
char *char_buf = buf_to_hex_str(captured,
(num_bits > DEBUG_JTAG_IOZ)
? DEBUG_JTAG_IOZ
: num_bits);
LOG_DEBUG("fields[%u].in_value[%u]: 0x%s",
i, num_bits, char_buf);
free(char_buf);
}
if (cmd->fields[i].in_value)
buf_cpy(captured, cmd->fields[i].in_value, num_bits);
free(captured);
}
bit_count += cmd->fields[i].num_bits;
}
return retval;
}
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