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/*
* 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 <program_loading.h>
#include <stdint.h>
#include <arch/boot.h>
#include <arch/encoding.h>
#include <arch/smp/atomic.h>
#include <console/console.h>
#include <vm.h>
/* Run OpenSBI and let OpenSBI hand over control to the payload */
void run_payload_opensbi(struct prog *prog, void *fdt, struct prog *opensbi, int payload_mode)
{
int hart_id = read_csr(mhartid);
uintptr_t status = read_csr(mstatus);
status = INSERT_FIELD(status, MSTATUS_MPIE, 0);
/*
* In case of OpenSBI we always run it in M-Mode.
* OpenSBI will switch to payload_mode when done.
*/
status = INSERT_FIELD(status, MSTATUS_MPP, PRV_M);
/* Trap vector base address point to the payload */
write_csr(mtvec, prog_entry(opensbi));
/* disable M-Mode interrupt */
write_csr(mie, 0);
write_csr(mstatus, status);
run_opensbi(hart_id, fdt, prog_entry(opensbi), prog_entry(prog), payload_mode);
}
/* Runs the payload without OpenSBI integration */
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");
}
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