2019-05-31 13:45:59 +00:00
|
|
|
# qemu -kernel starts at 0x1000. the instructions
|
|
|
|
|
# there seem to be provided by qemu, as if it
|
|
|
|
|
# were a ROM. the code at 0x1000 jumps to
|
2020-08-10 20:25:51 +00:00
|
|
|
# 0x80000000, the _start function here,
|
2019-07-23 15:14:10 +00:00
|
|
|
# in machine mode. each CPU starts here.
|
2019-05-31 13:45:59 +00:00
|
|
|
.section .data
|
|
|
|
|
.globl stack0
|
|
|
|
|
.section .text
|
2019-07-23 18:31:12 +00:00
|
|
|
.globl start
|
2019-05-31 13:45:59 +00:00
|
|
|
.section .text
|
|
|
|
|
.globl _entry
|
|
|
|
|
_entry:
|
2019-06-05 15:42:03 +00:00
|
|
|
# set up a stack for C.
|
2019-07-23 15:14:10 +00:00
|
|
|
# stack0 is declared in start.c,
|
|
|
|
|
# with a 4096-byte stack per CPU.
|
|
|
|
|
# sp = stack0 + (hartid * 4096)
|
2019-05-31 13:45:59 +00:00
|
|
|
la sp, stack0
|
2019-06-05 15:42:03 +00:00
|
|
|
li a0, 1024*4
|
|
|
|
|
csrr a1, mhartid
|
|
|
|
|
addi a1, a1, 1
|
|
|
|
|
mul a0, a0, a1
|
|
|
|
|
add sp, sp, a0
|
2019-07-23 18:31:12 +00:00
|
|
|
# jump to start() in start.c
|
|
|
|
|
call start
|
2019-05-31 13:45:59 +00:00
|
|
|
junk:
|
|
|
|
|
j junk
|
