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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
#include <cassert>
#include <cstdint>
#include <iostream>
#include <unordered_map>
#include <verilated.h>
#include "Vptw.h"
namespace {
constexpr uint8_t MODE_BARE = 0;
constexpr uint8_t MODE_SV39 = 8;
constexpr uint8_t MODE_SV48 = 9;
constexpr uint8_t MODE_SV57 = 10;
constexpr uint8_t MODE_SV64 = 11;
constexpr uint64_t FLAG_V = 1ULL << 0;
constexpr uint64_t FLAG_R = 1ULL << 1;
constexpr uint64_t FLAG_W = 1ULL << 2;
constexpr uint64_t FLAG_X = 1ULL << 3;
constexpr uint64_t FLAG_A = 1ULL << 6;
constexpr uint64_t FLAG_D = 1ULL << 7;
int g_pass_count = 0;
void check(bool cond, const char* name) {
if (cond) {
std::cout << "\033[32m[PASS] " << name << "\033[0m\n";
++g_pass_count;
} else {
std::cout << "\033[31m[FAIL] " << name << "\033[0m\n";
assert(false);
}
}
uint64_t make_satp(uint8_t mode, uint16_t asid, uint64_t ppn) {
return (uint64_t(mode) << 60) | (uint64_t(asid) << 44) | (ppn & ((1ULL << 44) - 1ULL));
}
uint64_t make_pte(uint64_t ppn, uint64_t flags) {
return ((ppn & ((1ULL << 44) - 1ULL)) << 10) | (flags & 0x3ffULL);
}
void tick(Vptw* dut) {
dut->clk = 0;
dut->eval();
dut->clk = 1;
dut->eval();
}
void reset(Vptw* dut) {
dut->rst = 1;
dut->req_valid = 0;
dut->mem_req_ready = 1;
dut->mem_resp_valid = 0;
dut->mem_resp_data = 0;
tick(dut);
tick(dut);
dut->rst = 0;
tick(dut);
}
void launch(
Vptw* dut,
uint64_t vaddr,
uint8_t mode,
bool fetch,
bool store,
uint64_t satp
) {
for (int i = 0; i < 8 && !dut->req_ready; ++i) {
dut->req_valid = 0;
dut->mem_resp_valid = 0;
tick(dut);
}
dut->req_valid = 1;
dut->req_vaddr = vaddr;
dut->req_asid = 1;
dut->req_mode = mode;
dut->req_priv = 1;
dut->req_is_fetch = fetch;
dut->req_is_store = store;
dut->req_sum = 0;
dut->req_mxr = 0;
dut->satp_value = satp;
tick(dut);
dut->req_valid = 0;
}
void run_walk(Vptw* dut, const std::unordered_map<uint64_t, uint64_t>& memory) {
bool inject_resp = false;
uint64_t next_resp_data = 0;
for (int cycle = 0; cycle < 80; ++cycle) {
dut->mem_req_ready = 1;
dut->mem_resp_valid = inject_resp ? 1 : 0;
dut->mem_resp_data = next_resp_data;
dut->clk = 0;
dut->eval();
if (dut->resp_valid) {
dut->mem_resp_valid = 0;
return;
}
const bool issued = dut->mem_req_valid && dut->mem_req_ready;
const uint64_t req_addr = dut->mem_req_addr;
dut->clk = 1;
dut->eval();
inject_resp = false;
next_resp_data = 0;
if (issued) {
const auto it = memory.find(req_addr);
next_resp_data = (it == memory.end()) ? 0 : it->second;
inject_resp = true;
}
}
check(false, "PTW_Timeout");
}
void add_sv39_mapping(
std::unordered_map<uint64_t, uint64_t>& memory,
uint64_t root_ppn,
uint64_t vaddr,
uint64_t l1_ppn,
uint64_t l0_ppn,
uint64_t leaf_ppn,
uint64_t leaf_flags
) {
const uint64_t vpn2 = (vaddr >> 30) & 0x1ffULL;
const uint64_t vpn1 = (vaddr >> 21) & 0x1ffULL;
const uint64_t vpn0 = (vaddr >> 12) & 0x1ffULL;
memory[(root_ppn << 12) + (vpn2 << 3)] = make_pte(l1_ppn, FLAG_V);
memory[(l1_ppn << 12) + (vpn1 << 3)] = make_pte(l0_ppn, FLAG_V);
memory[(l0_ppn << 12) + (vpn0 << 3)] = make_pte(leaf_ppn, leaf_flags);
}
} // namespace
int main(int argc, char** argv) {
Verilated::commandArgs(argc, argv);
auto* dut = new Vptw;
std::cout << "----------------------------------\n";
std::cout << " PTW Unit Test\n";
std::cout << "----------------------------------\n";
reset(dut);
launch(dut, 0x0000000040401000ULL, MODE_SV48, false, false, make_satp(MODE_BARE, 1, 0x100));
run_walk(dut, {});
check(dut->resp_fault == 1, "Sv48_Stub_Fault");
launch(dut, 0x0000000040401000ULL, MODE_SV57, false, false, make_satp(MODE_BARE, 1, 0x100));
run_walk(dut, {});
check(dut->resp_fault == 1, "Sv57_Stub_Fault");
launch(dut, 0x0000000040401000ULL, MODE_SV64, false, false, make_satp(MODE_BARE, 1, 0x100));
run_walk(dut, {});
check(dut->resp_fault == 1, "Sv64_Stub_Fault");
const uint64_t root_ppn = 0x100;
const uint64_t va = 0x0000000040401234ULL;
const uint64_t leaf_ppn = 0x45670;
std::unordered_map<uint64_t, uint64_t> mem_ok;
add_sv39_mapping(mem_ok, root_ppn, va, 0x210, 0x220, leaf_ppn,
FLAG_V | FLAG_R | FLAG_W | FLAG_A | FLAG_D);
launch(dut, va, MODE_SV39, false, false, make_satp(MODE_SV39, 1, root_ppn));
run_walk(dut, mem_ok);
check(dut->resp_fault == 0, "Sv39_Success_NoFault");
check(dut->resp_paddr == ((leaf_ppn << 12) | (va & 0xfffULL)), "Sv39_Success_Paddr");
check(dut->refill_valid == 1, "Sv39_Success_Refill");
check(dut->refill_level == 0, "Sv39_Success_Level0");
std::unordered_map<uint64_t, uint64_t> mem_no_x;
add_sv39_mapping(mem_no_x, root_ppn, va, 0x230, 0x240, 0x50000, FLAG_V | FLAG_R | FLAG_A);
launch(dut, va, MODE_SV39, true, false, make_satp(MODE_SV39, 1, root_ppn));
run_walk(dut, mem_no_x);
check(dut->resp_fault == 1, "Sv39_Fetch_NoX_Fault");
check(dut->refill_valid == 0, "Sv39_Fetch_NoX_NoRefill");
std::unordered_map<uint64_t, uint64_t> mem_store_d0;
add_sv39_mapping(mem_store_d0, root_ppn, va, 0x250, 0x260, 0x60000,
FLAG_V | FLAG_R | FLAG_W | FLAG_A);
launch(dut, va, MODE_SV39, false, true, make_satp(MODE_SV39, 1, root_ppn));
run_walk(dut, mem_store_d0);
check(dut->resp_fault == 1, "Sv39_Store_D0_Fault");
launch(dut, 0x0000008000000000ULL, MODE_SV39, false, false, make_satp(MODE_SV39, 1, root_ppn));
run_walk(dut, {});
check(dut->resp_fault == 1, "Sv39_NonCanonical_Fault");
std::cout << "----------------------------------\n";
std::cout << "All " << g_pass_count << " PTW tests passed!\n";
std::cout << "----------------------------------\n";
delete dut;
return 0;
}
|
