1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
#ifndef TARGET__RISCV__SCANS_H
#define TARGET__RISCV__SCANS_H
#include "target/target.h"
#include "jtag/jtag.h"
enum riscv_scan_type {
RISCV_SCAN_TYPE_INVALID,
RISCV_SCAN_TYPE_NOP,
RISCV_SCAN_TYPE_READ,
RISCV_SCAN_TYPE_WRITE,
};
/* A batch of multiple JTAG scans, which are grouped together to avoid the
* overhead of some JTAG adapters when sending single commands. This is
* designed to support block copies, as that's what we actually need to go
* fast. */
struct riscv_batch {
struct target *target;
size_t allocated_scans;
size_t used_scans;
size_t idle_count;
uint8_t *data_out;
uint8_t *data_in;
struct scan_field *fields;
/* In JTAG we scan out the previous value's output when performing a
* scan. This is a pain for users, so we just provide them the
* illusion of not having to do this by eliding all but the last NOP.
* */
enum riscv_scan_type last_scan;
/* The read keys. */
size_t *read_keys;
size_t read_keys_used;
};
/* Allocates (or frees) a new scan set. "scans" is the maximum number of JTAG
* scans that can be issued to this object, and idle is the number of JTAG idle
* cycles between every real scan. */
struct riscv_batch *riscv_batch_alloc(struct target *target, size_t scans, size_t idle);
void riscv_batch_free(struct riscv_batch *batch);
/* Checks to see if this batch is full. */
bool riscv_batch_full(struct riscv_batch *batch);
/* Executes this scan batch. */
int riscv_batch_run(struct riscv_batch *batch);
/* Adds a DMI write to this batch. */
void riscv_batch_add_dmi_write(struct riscv_batch *batch, unsigned address, uint64_t data);
/* DMI reads must be handled in two parts: the first one schedules a read and
* provides a key, the second one actually obtains the value of that read .*/
size_t riscv_batch_add_dmi_read(struct riscv_batch *batch, unsigned address);
uint64_t riscv_batch_get_dmi_read(struct riscv_batch *batch, size_t key);
/* Scans in a NOP. */
void riscv_batch_add_nop(struct riscv_batch *batch);
#endif
|
