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arcv2: Halt non-master cores

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Even though we expect only master core to execute U-Boot code
let's make sure even if for some reason slave cores attempt to
execute U-Boot in parallel with master they get halted very early.

If platform wants it may kick-start slave cores before passing control
to say Linux kernel or any other application that want to see all cores
of SMP SoC up and running.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Alexey Brodkin 2017-03-30 17:50:45 +03:00
parent 2a5062ca9e
commit 6cba327bd9
1 changed files with 16 additions and 0 deletions
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16
arch/arc/lib/start.S
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@ -10,6 +10,22 @@
#include <asm/arcregs.h>
ENTRY(_start)
; Non-masters will be halted immediately, they might be kicked later
; by platform code right before passing control to the Linux kernel
; in bootm.c:boot_jump_linux().
lr r5, [identity]
lsr r5, r5, 8
bmsk r5, r5, 7
cmp r5, 0
mov.nz r0, r5
bz .Lmaster_proceed
flag 1
nop
nop
nop
.Lmaster_proceed:
/* Setup interrupt vector base that matches "__text_start" */
sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]