diff options
Diffstat (limited to 'pk/gpe/gpe_scom_handler.S')
| -rw-r--r-- | pk/gpe/gpe_scom_handler.S | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/pk/gpe/gpe_scom_handler.S b/pk/gpe/gpe_scom_handler.S index 4806390a..44daa52b 100644 --- a/pk/gpe/gpe_scom_handler.S +++ b/pk/gpe/gpe_scom_handler.S @@ -7,9 +7,6 @@ /// \file gpe_scom_handler.S /// \brief Interrupt handler code for SCOM requests from the ppc405 /// -/// This handler is implemented as a fast-mode handler, which means -/// that only r3, r4, r5, r6, cr0, and lr have been saved off and -/// are available to be used. .nolist #include "pk.h" @@ -17,7 +14,7 @@ .list ## This function handles requests from the ppc405 to perform a getscom - ## or putsom operation. + ## or putscom operation. ## ## The ppc405 must supply a request in the following format: ## @@ -48,8 +45,8 @@ gpe_scom_handler: lwz %r4, OCCHW_SCOM_ADDR_OFFSET(%r3) ## Mask all SIB errors - mfmsr %r5 - _oriwa %r5, %r5, MSR_SEM + mfmsr %r7 + _oriwa %r5, %r7, MSR_SEM mtmsr %r5 ## Check bit 0 of the scom address to determine if this @@ -80,6 +77,10 @@ _get_scom_status: ## then, store it to the OISR0_CLR address _stwi %r3, %r4, OCB_OISR0_CLR + ## restore the MSR as it was before we changed it + mtmsr %r7 + + ## return blr _do_putscom: |
