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riscv: support SPL stack and global data relocation

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To support relocation of the stack and global data on RISC-V, the
secondary harts must be notified of the change using IPIs. We can reuse
the hart relocation code for this purpose. It uses global data to store
the new stack pointer and global data pointer for the secondary harts.
This means that we cannot update the global data pointer of the main
hart in spl_relocate_stack_gd(), because the secondary harts have not
yet been relocated at this point. It is updated after the secondary
harts have been notified.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Lukas Auer 2019-08-21 21:14:46 +02:00 committed by Andes
parent 8c59f2023c
commit c7e1effb96
2 changed files with 35 additions and 2 deletions
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35
arch/riscv/cpu/start.S
View File

@ -169,13 +169,46 @@ wait_for_gd_init:
spl_clear_bss:
la t0, __bss_start
la t1, __bss_end
beq t0, t1, spl_call_board_init_r
beq t0, t1, spl_stack_gd_setup
spl_clear_bss_loop:
SREG zero, 0(t0)
addi t0, t0, REGBYTES
bne t0, t1, spl_clear_bss_loop
spl_stack_gd_setup:
jal spl_relocate_stack_gd
/* skip setup if we did not relocate */
beqz a0, spl_call_board_init_r
mv s0, a0
/* setup stack on main hart */
#ifdef CONFIG_SMP
/* tp: hart id */
slli t0, tp, CONFIG_STACK_SIZE_SHIFT
sub sp, s0, t0
#else
mv sp, s0
#endif
/* set new stack and global data pointer on secondary harts */
spl_secondary_hart_stack_gd_setup:
la a0, secondary_hart_relocate
mv a1, s0
mv a2, s0
jal smp_call_function
/* hang if relocation of secondary harts has failed */
beqz a0, 1f
mv a1, a0
la a0, secondary_harts_relocation_error
jal printf
jal hang
/* set new global data pointer on main hart */
1: mv gp, s0
spl_call_board_init_r:
mv a0, zero
mv a1, zero

2
common/spl/spl.c
View File

@ -781,7 +781,7 @@ ulong spl_relocate_stack_gd(void)
#if CONFIG_IS_ENABLED(DM)
dm_fixup_for_gd_move(new_gd);
#endif
#if !defined(CONFIG_ARM)
#if !defined(CONFIG_ARM) && !defined(CONFIG_RISCV)
gd = new_gd;
#endif
return ptr;