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| author | Dino Li <dino.li@ite.com.tw> | 2015-12-16 18:31:07 +0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2015-12-16 21:49:34 -0800 |
| commit | 11c2c9223688c9d8d5833ab1d0d9dd7dfdca635d (patch) | |
| tree | a6dda955821162e0847b116866468e472577cf7d /core/nds32/init.S | |
| parent | 51811325d248b216c1d079c61a971ecead447d8c (diff) | |
| download | chrome-ec-11c2c9223688c9d8d5833ab1d0d9dd7dfdca635d.tar.gz | |
nds32: start_irq_handler() use system stack
[symptom]
The 'vboot_hash_start()' always return busy error and variable 'in_progress'
got a strange value(should be 0 or 1).
'start_irq_handler()' causes scratchpad overflow in first context switch.
It must be called after SP switch to system stack in ISR.
NOTE:
The scratchpad is still also need more size even if
'start_irq_handler()' is using system stack. following is detail:
1. uint32_t scratchpad[19] 0x81d34 ~ 0x81d7f
[__task_start:]
2. /* put the dummy stack pointer at the top of the stack in scratchpad */
addi $sp, $r3, 4 * 18
-> SP 0x81d7c
3. syscall push return address (-4)
-> SP 0x81d78
[ISR:]
4. push r15, fp, lp, and sp (-0x10)
-> SP 0x81d68
5. push r0 ~ r5 (-0x18)
-> SP 0x81d50
[__switch_task:]
6. /* save ipsw, ipc, r6, r7, r8, r9, r10 on the current process stack */ (-0x1C)
-> SP 0x81d34
Signed-off-by: Dino Li <dino.li@ite.com.tw>
BRANCH=none
BUG=none
TEST=1. hash done.
2. console command 'taskinfo'.
3. the scratchpad does not overflow after first context switch.
Change-Id: If5d89ff5c945a777010492fcfb54bf41f434ed69
Reviewed-on: https://chromium-review.googlesource.com/317468
Commit-Ready: Dino Li <dino.li@ite.com.tw>
Tested-by: Dino Li <dino.li@ite.com.tw>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Diffstat (limited to 'core/nds32/init.S')
| -rw-r--r-- | core/nds32/init.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/core/nds32/init.S b/core/nds32/init.S index 1f0b5c28e6..1f9c71b3c6 100644 --- a/core/nds32/init.S +++ b/core/nds32/init.S @@ -20,13 +20,13 @@ __entry_\()\name: smw.adm $r15, [$sp], $r15, 0xb /* r0-r5 are caller saved */ smw.adm $r0, [$sp], $r5, 0 - /* isr entry */ - jal start_irq_handler /* switch to system stack if we are called from process stack */ la $r3, stack_end mov55 $fp, $sp slt45 $r3, $sp /* if sp > end of system stack, then r15 = 1 and */ cmovn $sp, $r3, $r15 /* point sp to the top of the system stack */ + /* isr entry */ + jal start_irq_handler /* C routine handler */ jal \name\()_handler /* check whether we need to change the scheduled task */ |