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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>
This commit is contained in:
Anup Patel 2019-10-31 14:11:55 +05:30
parent dd8ef28b27
commit 98f4a20899
1 changed files with 11 additions and 6 deletions
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17
firmware/fw_base.S
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@ -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: