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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2016 Google Inc
* Copyright (C) 2018 HardenedLinux
* Copyright (C) 2018 Jonathan Neuschäfer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdint.h>
#include <arch/boot.h>
#include <arch/encoding.h>
#include <console/console.h>
#include <vm.h>
void run_payload(struct prog *prog, void *fdt, int payload_mode)
{
void (*doit)(int hart_id, void *fdt) = prog_entry(prog);
int hart_id = read_csr(mhartid);
uintptr_t status = read_csr(mstatus);
status = INSERT_FIELD(status, MSTATUS_MPIE, 0);
switch (payload_mode) {
case RISCV_PAYLOAD_MODE_U:
status = INSERT_FIELD(status, MSTATUS_MPP, PRV_U);
/* Trap vector base address point to the payload */
write_csr(utvec, doit);
/* disable U-Mode interrupt */
write_csr(uie, 0);
break;
case RISCV_PAYLOAD_MODE_S:
status = INSERT_FIELD(status, MSTATUS_MPP, PRV_S);
/* Trap vector base address point to the payload */
write_csr(stvec, doit);
/* disable S-Mode interrupt */
write_csr(sie, 0);
/* disable MMU */
write_csr(satp, 0);
break;
case RISCV_PAYLOAD_MODE_M:
status = INSERT_FIELD(status, MSTATUS_MPP, PRV_M);
/* Trap vector base address point to the payload */
write_csr(mtvec, doit);
/* disable M-Mode interrupt */
write_csr(mie, 0);
break;
default:
die("wrong privilege level for payload");
break;
}
write_csr(mstatus, status);
write_csr(mepc, doit);
asm volatile(
"mv a0, %0\n\t"
"mv a1, %1\n\t"
"mret" ::"r"(hart_id),
"r"(fdt)
: "a0", "a1");
}
|
