diff options
Diffstat (limited to 'src/arch/riscv/payload.S')
| -rw-r--r-- | src/arch/riscv/payload.S | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/src/arch/riscv/payload.S b/src/arch/riscv/payload.S index a189adf1db..1b8cb96110 100644 --- a/src/arch/riscv/payload.S +++ b/src/arch/riscv/payload.S @@ -1,6 +1,9 @@ /* * This file is part of the coreboot project. * + * Copyright (C) 2016 Google Inc + * 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. @@ -11,17 +14,22 @@ * GNU General Public License for more details. */ -// "return" to a payload pointed to by a1 with -// an M-mode pointer (or, to upper levels, physical address) -// to the config string in a0. +// "return" to a payload. a0: FDT, a1: entry point .global riscvpayload riscvpayload: - mv t0,a1 - csrw mepc, t0 - csrr t0, mstatus - li t1, ~(3<<11) - and t0, t0, t1 - li t2, (1<<11) - or t0, t0, t2 - csrw mstatus, t0 + /* Load the entry point */ + mv t0, a1 + csrw mepc, t0 + csrr t0, mstatus + + /* Set mstatus.MPP (the previous privilege mode) to supervisor mode */ + li t1, ~(3<<11) + and t0, t0, t1 + li t2, (1<<11) + or t0, t0, t2 + csrw mstatus, t0 + + /* Pass the right arguments and jump! */ + mv a1, a0 + csrr a0, mhartid mret |