95ba4c87f5
RISCV requires the bios/bootloader to set up an interface by which it can get information about memory, talk to host devices, etc. Put implementation for spike in src/mainboard/emulation/spike-riscv/spike_util.c, and src/arch/riscv/trap_handler.c Change-Id: Ie1d5f361595e48fa6cc1fac25485ad623ecdc717 Signed-off-by: Thaminda Edirisooriya <thaminda@google.com> Reviewed-on: http://review.coreboot.org/11368 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
136 lines
3.5 KiB
ArmAsm
136 lines
3.5 KiB
ArmAsm
/*
|
|
* Early initialization code for riscv
|
|
*
|
|
* Copyright 2015 Google Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc.
|
|
*/
|
|
|
|
#include <bits.h>
|
|
.macro restore_regs
|
|
# restore x registers
|
|
LOAD x1,1*REGBYTES(a0)
|
|
LOAD x2,2*REGBYTES(a0)
|
|
LOAD x3,3*REGBYTES(a0)
|
|
LOAD x4,4*REGBYTES(a0)
|
|
LOAD x5,5*REGBYTES(a0)
|
|
LOAD x6,6*REGBYTES(a0)
|
|
LOAD x7,7*REGBYTES(a0)
|
|
LOAD x8,8*REGBYTES(a0)
|
|
LOAD x9,9*REGBYTES(a0)
|
|
LOAD x11,11*REGBYTES(a0)
|
|
LOAD x12,12*REGBYTES(a0)
|
|
LOAD x13,13*REGBYTES(a0)
|
|
LOAD x14,14*REGBYTES(a0)
|
|
LOAD x15,15*REGBYTES(a0)
|
|
LOAD x16,16*REGBYTES(a0)
|
|
LOAD x17,17*REGBYTES(a0)
|
|
LOAD x18,18*REGBYTES(a0)
|
|
LOAD x19,19*REGBYTES(a0)
|
|
LOAD x20,20*REGBYTES(a0)
|
|
LOAD x21,21*REGBYTES(a0)
|
|
LOAD x22,22*REGBYTES(a0)
|
|
LOAD x23,23*REGBYTES(a0)
|
|
LOAD x24,24*REGBYTES(a0)
|
|
LOAD x25,25*REGBYTES(a0)
|
|
LOAD x26,26*REGBYTES(a0)
|
|
LOAD x27,27*REGBYTES(a0)
|
|
LOAD x28,28*REGBYTES(a0)
|
|
LOAD x29,29*REGBYTES(a0)
|
|
LOAD x30,30*REGBYTES(a0)
|
|
LOAD x31,31*REGBYTES(a0)
|
|
# restore a0 last
|
|
LOAD x10,10*REGBYTES(a0)
|
|
|
|
|
|
.endm
|
|
.macro save_tf
|
|
# save gprs
|
|
STORE x1,1*REGBYTES(x2)
|
|
STORE x3,3*REGBYTES(x2)
|
|
STORE x4,4*REGBYTES(x2)
|
|
STORE x5,5*REGBYTES(x2)
|
|
STORE x6,6*REGBYTES(x2)
|
|
STORE x7,7*REGBYTES(x2)
|
|
STORE x8,8*REGBYTES(x2)
|
|
STORE x9,9*REGBYTES(x2)
|
|
STORE x10,10*REGBYTES(x2)
|
|
STORE x11,11*REGBYTES(x2)
|
|
STORE x12,12*REGBYTES(x2)
|
|
STORE x13,13*REGBYTES(x2)
|
|
STORE x14,14*REGBYTES(x2)
|
|
STORE x15,15*REGBYTES(x2)
|
|
STORE x16,16*REGBYTES(x2)
|
|
STORE x17,17*REGBYTES(x2)
|
|
STORE x18,18*REGBYTES(x2)
|
|
STORE x19,19*REGBYTES(x2)
|
|
STORE x20,20*REGBYTES(x2)
|
|
STORE x21,21*REGBYTES(x2)
|
|
STORE x22,22*REGBYTES(x2)
|
|
STORE x23,23*REGBYTES(x2)
|
|
STORE x24,24*REGBYTES(x2)
|
|
STORE x25,25*REGBYTES(x2)
|
|
STORE x26,26*REGBYTES(x2)
|
|
STORE x27,27*REGBYTES(x2)
|
|
STORE x28,28*REGBYTES(x2)
|
|
STORE x29,29*REGBYTES(x2)
|
|
STORE x30,30*REGBYTES(x2)
|
|
STORE x31,31*REGBYTES(x2)
|
|
|
|
# get sr, epc, badvaddr, cause
|
|
csrrw t0,mscratch,x0
|
|
csrr s0,mstatus
|
|
csrr t1,mepc
|
|
csrr t2,mbadaddr
|
|
csrr t3,mcause
|
|
STORE t0,2*REGBYTES(x2)
|
|
STORE s0,32*REGBYTES(x2)
|
|
STORE t1,33*REGBYTES(x2)
|
|
STORE t2,34*REGBYTES(x2)
|
|
STORE t3,35*REGBYTES(x2)
|
|
|
|
# get faulting insn, if it wasn't a fetch-related trap
|
|
li x5,-1
|
|
STORE x5,36*REGBYTES(x2)
|
|
1:
|
|
.endm
|
|
|
|
.text
|
|
.global supervisor_trap_entry
|
|
supervisor_trap_entry:
|
|
csrw mscratch, sp
|
|
# load in the top of the machine stack
|
|
la sp, 0x80FFF0
|
|
1:addi sp,sp,-320
|
|
save_tf
|
|
move a0,sp
|
|
jal trap_handler
|
|
.global trap_entry
|
|
trap_entry:
|
|
csrw mscratch, sp
|
|
1:addi sp,sp,-320
|
|
save_tf
|
|
move a0,sp
|
|
jal trap_handler
|
|
.global supervisor_call_return
|
|
supervisor_call_return:
|
|
csrr a0, mscratch
|
|
restore_regs
|
|
eret # go back into supervisor call
|
|
.global machine_call_return
|
|
machine_call_return:
|
|
csrr a0, mscratch
|
|
restore_regs
|
|
eret # go back into machine call
|