65 lines
1.6 KiB
Plaintext
65 lines
1.6 KiB
Plaintext
.section .text
|
|
|
|
.global smp_trampoline_start
|
|
smp_trampoline_start:
|
|
// The AP begins executing here with the following state:
|
|
// satp = 0
|
|
// sstatus.SIE = 0
|
|
// a0 = hartid
|
|
// a1 = struct trampoline_passed_info *
|
|
//
|
|
// All other registers are undefined.
|
|
|
|
ld a0, 16(a1)
|
|
ld t0, 8(a1)
|
|
csrw satp, t0
|
|
|
|
// Tell the BSP we've started.
|
|
li t0, 1
|
|
fence rw, w
|
|
sd t0, (a1)
|
|
|
|
// Zero all the things.
|
|
// Preserve a0
|
|
mv a1, zero
|
|
mv a2, zero
|
|
mv a3, zero
|
|
mv a4, zero
|
|
mv a5, zero
|
|
mv a6, zero
|
|
mv a7, zero
|
|
mv s0, zero
|
|
mv s1, zero
|
|
mv s2, zero
|
|
mv s3, zero
|
|
mv s4, zero
|
|
mv s5, zero
|
|
mv s6, zero
|
|
mv s7, zero
|
|
mv s8, zero
|
|
mv s9, zero
|
|
mv s10, zero
|
|
mv s11, zero
|
|
mv t1, zero
|
|
mv t2, zero
|
|
mv t3, zero
|
|
mv t4, zero
|
|
mv t5, zero
|
|
mv t6, zero
|
|
mv tp, zero
|
|
mv ra, zero
|
|
|
|
csrw sie, zero
|
|
csrw stvec, zero
|
|
|
|
// Wait for kernel to tell us where to go.
|
|
0: .insn i 0x0F, 0, x0, x0, 0x010 // pause
|
|
ld t0, 24(a0)
|
|
fence r, rw
|
|
beqz t0, 0b
|
|
|
|
// Load sp from reserved field of info struct
|
|
ld sp, 16(a0)
|
|
|
|
jr t0
|