/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011,2012,2013 Giovanni Di Sirio. This file is part of ChibiOS/RT. ChibiOS/RT is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. ChibiOS/RT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . --- A special exception to the GPL can be applied should you wish to distribute a combined work that includes ChibiOS/RT, without being obliged to provide the source code for any proprietary components. See the file exception.txt for full details of how and when the exception can be applied. */ /** * @file PPC/ivor.s * @brief Kernel ISRs. * * @addtogroup PPC_CORE * @{ */ /* * Imports the PPC configuration headers. */ #define _FROM_ASM_ #include "chconf.h" #include "chcore.h" #if !defined(__DOXYGEN__) /* * INTC registers address. */ .equ INTC_IACKR, 0xfff48010 .equ INTC_EOIR, 0xfff48018 .section .handlers, "ax" #if PPC_SUPPORTS_DECREMENTER /* * _IVOR10 handler (Book-E decrementer). */ .align 4 .globl _IVOR10 .type _IVOR10, @function _IVOR10: /* Creation of the external stack frame (extctx structure).*/ stwu %sp, -80(%sp) /* Size of the extctx structure.*/ #if PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI e_stmvsrrw 8(%sp) /* Saves PC, MSR. */ e_stmvsprw 16(%sp) /* Saves CR, LR, CTR, XER. */ e_stmvgprw 32(%sp) /* Saves GPR0, GPR3...GPR12. */ #else /* !(PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI) */ stw %r0, 32(%sp) /* Saves GPR0. */ mfSRR0 %r0 stw %r0, 8(%sp) /* Saves PC. */ mfSRR1 %r0 stw %r0, 12(%sp) /* Saves MSR. */ mfCR %r0 stw %r0, 16(%sp) /* Saves CR. */ mfLR %r0 stw %r0, 20(%sp) /* Saves LR. */ mfCTR %r0 stw %r0, 24(%sp) /* Saves CTR. */ mfXER %r0 stw %r0, 28(%sp) /* Saves XER. */ stw %r3, 36(%sp) /* Saves GPR3...GPR12. */ stw %r4, 40(%sp) stw %r5, 44(%sp) stw %r6, 48(%sp) stw %r7, 52(%sp) stw %r8, 56(%sp) stw %r9, 60(%sp) stw %r10, 64(%sp) stw %r11, 68(%sp) stw %r12, 72(%sp) #endif /* !(PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI) */ /* Reset DIE bit in TSR register.*/ lis %r3, 0x0800 /* DIS bit mask. */ mtspr 336, %r3 /* TSR register. */ #if CH_DBG_SYSTEM_STATE_CHECK bl dbg_check_enter_isr bl dbg_check_lock_from_isr #endif bl chSysTimerHandlerI #if CH_DBG_SYSTEM_STATE_CHECK bl dbg_check_unlock_from_isr bl dbg_check_leave_isr #endif /* System tick handler invocation.*/ #if CH_DBG_SYSTEM_STATE_CHECK bl dbg_check_lock #endif bl chSchIsPreemptionRequired cmpli cr0, %r3, 0 beq cr0, _ivor_exit bl chSchDoReschedule b _ivor_exit #endif /* PPC_SUPPORTS_DECREMENTER */ /* * _IVOR4 handler (Book-E external interrupt). */ .align 4 .globl _IVOR4 .type _IVOR4, @function _IVOR4: /* Creation of the external stack frame (extctx structure).*/ stwu %sp, -80(%sp) /* Size of the extctx structure.*/ #if PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI e_stmvsrrw 8(%sp) /* Saves PC, MSR. */ e_stmvsprw 16(%sp) /* Saves CR, LR, CTR, XER. */ e_stmvgprw 32(%sp) /* Saves GPR0, GPR3...GPR12. */ #else /* !(PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI) */ stw %r0, 32(%sp) /* Saves GPR0. */ mfSRR0 %r0 stw %r0, 8(%sp) /* Saves PC. */ mfSRR1 %r0 stw %r0, 12(%sp) /* Saves MSR. */ mfCR %r0 stw %r0, 16(%sp) /* Saves CR. */ mfLR %r0 stw %r0, 20(%sp) /* Saves LR. */ mfCTR %r0 stw %r0, 24(%sp) /* Saves CTR. */ mfXER %r0 stw %r0, 28(%sp) /* Saves XER. */ stw %r3, 36(%sp) /* Saves GPR3...GPR12. */ stw %r4, 40(%sp) stw %r5, 44(%sp) stw %r6, 48(%sp) stw %r7, 52(%sp) stw %r8, 56(%sp) stw %r9, 60(%sp) stw %r10, 64(%sp) stw %r11, 68(%sp) stw %r12, 72(%sp) #endif /* !(PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI) */ /* Software vector address from the INTC register.*/ lis %r3, INTC_IACKR@h ori %r3, %r3, INTC_IACKR@l /* IACKR register address. */ lwz %r3, 0(%r3) /* IACKR register value. */ lwz %r3, 0(%r3) mtCTR %r3 /* Software handler address. */ #if PPC_USE_IRQ_PREEMPTION /* Allows preemption while executing the software handler.*/ wrteei 1 #endif /* Exectes the software handler.*/ bctrl #if PPC_USE_IRQ_PREEMPTION /* Prevents preemption again.*/ wrteei 0 #endif /* Informs the INTC that the interrupt has been served.*/ mbar 0 lis %r3, INTC_EOIR@h ori %r3, %r3, INTC_EOIR@l stw %r3, 0(%r3) /* Writing any value should do. */ /* Verifies if a reschedule is required.*/ #if CH_DBG_SYSTEM_STATE_CHECK bl dbg_check_lock #endif bl chSchIsPreemptionRequired cmpli cr0, %r3, 0 beq cr0, _ivor_exit bl chSchDoReschedule /* Context restore.*/ .globl _ivor_exit _ivor_exit: #if CH_DBG_SYSTEM_STATE_CHECK bl dbg_check_unlock #endif #if PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI e_lmvgprw 32(%sp) /* Restores GPR0, GPR3...GPR12. */ e_lmvsprw 16(%sp) /* Restores CR, LR, CTR, XER. */ e_lmvsrrw 8(%sp) /* Restores PC, MSR. */ #else /*!(PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI) */ lwz %r3, 36(%sp) /* Restores GPR3...GPR12. */ lwz %r4, 40(%sp) lwz %r5, 44(%sp) lwz %r6, 48(%sp) lwz %r7, 52(%sp) lwz %r8, 56(%sp) lwz %r9, 60(%sp) lwz %r10, 64(%sp) lwz %r11, 68(%sp) lwz %r12, 72(%sp) lwz %r0, 8(%sp) mtSRR0 %r0 /* Restores PC. */ lwz %r0, 12(%sp) mtSRR1 %r0 /* Restores MSR. */ lwz %r0, 16(%sp) mtCR %r0 /* Restores CR. */ lwz %r0, 20(%sp) mtLR %r0 /* Restores LR. */ lwz %r0, 24(%sp) mtCTR %r0 /* Restores CTR. */ lwz %r0, 28(%sp) mtXER %r0 /* Restores XER. */ lwz %r0, 32(%sp) /* Restores GPR0. */ #endif /* !(PPC_USE_VLE && PPC_SUPPORTS_VLE_MULTI) */ addi %sp, %sp, 80 /* Back to the previous frame. */ rfi #endif /* !defined(__DOXYGEN__) */ /** @} */