1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
.section ".text.init"
.globl _start
_start:
/* disable interrupts and poging */
csrw satp, zero
csrw sie, zero
csrw sip, zero
.option push
.option norelax
la gp, __global_pointer$
.option pop
/* setup stack */
addi t0, a0, 1
li t1, PAGE_SIZE
la sp, __stack_start
mul t1, t1, t0
add sp, sp, t1
/* setup thread pointer */
mv tp, a0
/* the label _boot_hart is shared between threads. only one hart will branch before it is no longer 0 */
li a2, 1
lla a3, _boot_hart
amoswap.w a3, a2, (a3)
bnez a3, 2f
/* clear the bss section */
la a2, __bss_start
la a3, __bss_end
1:
sd zero, (a2)
addi a2, a2, __SIZEOF_POINTER__
blt a2, a3, 1b
2:
call init
j _spin
_spin:
wfi
j _spin
.section ".data"
_boot_hart:
.word 0
.section ".rodata"
/* linker imports */
.globl HEAP_START
HEAP_START: .dword __heap_start
|
