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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 <stdint.h>
#include <arch/boot.h>
#include <arch/encoding.h>
#include <console/console.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 &= ~MSTATUS_MPIE;
status &= ~MSTATUS_MPP;
switch (payload_mode) {
case RISCV_PAYLOAD_MODE_U:
break;
case RISCV_PAYLOAD_MODE_S:
status |= MSTATUS_SPP;
break;
case RISCV_PAYLOAD_MODE_M:
doit(hart_id, fdt);
return;
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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