Commit d6d51612 authored by Zong Li's avatar Zong Li Committed by Palmer Dabbelt

riscv: force __cpu_up_ variables to put in data section

Put __cpu_up_stack_pointer and __cpu_up_task_pointer in data section.
Currently, these two variables are put in bss section, there is a
potential risk that secondary harts get the uninitialized value before
main hart finishing the bss clearing. In this case, all secondary
harts would pass the waiting loop and enable the MMU before main hart
set up the page table.

This issue happens on random booting of multiple harts, which means
it will manifest for BBL and OpenSBI v0.6 (or older version). In OpenSBI
v0.7 (or higher version), we have HSM extension so all the secondary harts
are brought-up by Linux kernel in an orderly fashion. This means we don't
need this change for OpenSBI v0.7 (or higher version).
Signed-off-by: default avatarZong Li <zong.li@sifive.com>
Reviewed-by: default avatarGreentime Hu <greentime.hu@sifive.com>
Reviewed-by: default avatarAnup Patel <anup@brainfault.org>
Reviewed-by: default avatarAtish Patra <atish.patra@wdc.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 0a9f2a61
...@@ -15,8 +15,8 @@ ...@@ -15,8 +15,8 @@
const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init; const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
void *__cpu_up_stack_pointer[NR_CPUS]; void *__cpu_up_stack_pointer[NR_CPUS] __section(.data);
void *__cpu_up_task_pointer[NR_CPUS]; void *__cpu_up_task_pointer[NR_CPUS] __section(.data);
extern const struct cpu_operations cpu_ops_sbi; extern const struct cpu_operations cpu_ops_sbi;
extern const struct cpu_operations cpu_ops_spinwait; extern const struct cpu_operations cpu_ops_spinwait;
......
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