diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2019-01-08 00:04:26 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.ibm.com> | 2019-02-13 14:36:44 +1100 |
| commit | 8a43bf86b7d4346521bd4ebc15eb3809d3d27adb (patch) | |
| tree | d17ac162d4037ecff73d27477ffc61945a37ac4e /asm/head.S | |
| parent | 4ebb78cffda897c4175f6659e98e6722ea60703f (diff) | |
| download | blackbird-skiboot-8a43bf86b7d4346521bd4ebc15eb3809d3d27adb.tar.gz blackbird-skiboot-8a43bf86b7d4346521bd4ebc15eb3809d3d27adb.zip | |
core/exceptions: implement an exception handler for non-powersave sresets
Detect non-powersave sresets and send them to the normal exception
handler which prints registers and stack.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
Diffstat (limited to 'asm/head.S')
| -rw-r--r-- | asm/head.S | 20 |
1 files changed, 19 insertions, 1 deletions
@@ -107,6 +107,7 @@ hir_trigger: * used for recovering from rvw or nap mode */ . = 0x100 +sreset_vector: /* BML entry, load up r3 with device tree location */ li %r3, 0 oris %r3, %r3, 0xa @@ -668,8 +669,25 @@ enter_p9_pm_state: */ .global reset_patch_start reset_patch_start: + mtsprg0 %r3 + mtsprg1 %r4 + mfspr %r3,SPR_SRR1 + mfcr %r4 + rldicl. %r3,%r3,48,62 + bne 1f /* powersave wakeup (CFAR not required) */ + mtcr %r4 + mfspr %r3,SPR_CFAR + li %r4,0x100 + b _exception + (reset_patch_start - sreset_vector) +1: LOAD_IMM64(%r30, SKIBOOT_BASE) + cmpdi %r3,0x1 + bne 2f /* state loss */ + LOAD_IMM32(%r3, reset_resume - __head) + b 3f +2: LOAD_IMM32(%r3, reset_wakeup - __head) +3: add %r3,%r30,%r3 mtctr %r3 bctr @@ -715,7 +733,7 @@ reset_wakeup: REST_GPR(29,%r1) REST_GPR(30,%r1) REST_GPR(31,%r1) - +reset_resume: /* Get LR back, pop stack and return */ addi %r1,%r1,STACK_FRAMESIZE ld %r0,16(%r1) |
