diff options
| author | Anup Patel <anup.patel@wdc.com> | 2019-10-31 11:41:55 +0300 |
|---|---|---|
| committer | Anup Patel <anup.patel@wdc.com> | 2019-11-05 06:20:04 +0300 |
| commit | 98f4a208995b027662a7b04a25e4fa5df5f3eefe (patch) | |
| tree | e099d38f51698f50e53d5ceec7ba27473edb068b /firmware | |
| parent | dd8ef28b2717140c0d6cc61a2d6ffbadb506235e (diff) | |
| download | opensbi-98f4a208995b027662a7b04a25e4fa5df5f3eefe.tar.xz | |
firmware: Introduce relocation lottery
Instead of forcing HART0 to do the relocation and scratch init
work, we should have an atomic lottery to decide which HART does
the relocation and scratch init.
This way any HART can be boot/main HART.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/fw_base.S | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/firmware/fw_base.S b/firmware/fw_base.S index 2c198cf..375c158 100644 --- a/firmware/fw_base.S +++ b/firmware/fw_base.S @@ -46,12 +46,11 @@ .globl _start .globl _start_warm _start: - /* - * Jump to warm-boot if this is not the first core booting, - * that is, for mhartid != 0 - */ - csrr a6, CSR_MHARTID - blt zero, a6, _wait_relocate_copy_done + /* Jump to relocation wait loop if we don't get relocation lottery */ + la a6, _relocate_lottery + li a7, 1 + amoadd.w a6, a7, (a6) + bnez a6, _wait_relocate_copy_done /* Save load address */ la t0, _load_start @@ -75,6 +74,8 @@ _relocate: blt t2, t0, _relocate_copy_to_upper _relocate_copy_to_lower: ble t1, t2, _relocate_copy_to_lower_loop + la t3, _relocate_lottery + BRANGE t2, t1, t3, _start_hang la t3, _boot_status BRANGE t2, t1, t3, _start_hang la t3, _relocate @@ -91,6 +92,8 @@ _relocate_copy_to_lower_loop: jr t4 _relocate_copy_to_upper: ble t3, t0, _relocate_copy_to_upper_loop + la t2, _relocate_lottery + BRANGE t0, t3, t2, _start_hang la t2, _boot_status BRANGE t0, t3, t2, _start_hang la t2, _relocate @@ -381,6 +384,8 @@ _start_warm: j _start_hang .align 3 +_relocate_lottery: + RISCV_PTR 0 _boot_status: RISCV_PTR 0 _load_start: |