| t2ex/t2ex_source/kernel/sysdepend_t2ex/cpu/em1d/cpu_task.h | bare source | permlink (0.03 seconds) |
1: /* 2: *---------------------------------------------------------------------- 3: * T2EX Software Package 4: * 5: * Copyright 2012 by Ken Sakamura. 6: * This software is distributed under the latest version of T-License 2.x. 7: *---------------------------------------------------------------------- 8: * 9: * Released by T-Engine Forum(http://www.t-engine.org/) at 2012/12/12. 10: * Modified by TRON Forum(http://www.tron.org/) at 2015/06/04. 11: * 12: *---------------------------------------------------------------------- 13: */ 14: /* 15: * This software package is available for use, modification, 16: * and redistribution in accordance with the terms of the attached 17: * T-License 2.x. 18: * If you want to redistribute the source code, you need to attach 19: * the T-License 2.x document. 20: * There's no obligation to publish the content, and no obligation 21: * to disclose it to the TRON Forum if you have modified the 22: * software package. 23: * You can also distribute the modified source code. In this case, 24: * please register the modification to T-Kernel traceability service. 25: * People can know the history of modifications by the service, 26: * and can be sure that the version you have inherited some 27: * modification of a particular version or not. 28: * 29: * http://trace.tron.org/tk/?lang=en 30: * http://trace.tron.org/tk/?lang=ja 31: * 32: * As per the provisions of the T-License 2.x, TRON Forum ensures that 33: * the portion of the software that is copyrighted by Ken Sakamura or 34: * the TRON Forum does not infringe the copyrights of a third party. 35: * However, it does not make any warranty other than this. 36: * DISCLAIMER: TRON Forum and Ken Sakamura shall not be held 37: * responsible for any consequences or damages caused directly or 38: * indirectly by the use of this software package. 39: * 40: * The source codes in bsd_source.tar.gz in this software package are 41: * derived from NetBSD or OpenBSD and not covered under T-License 2.x. 42: * They need to be changed or redistributed according to the 43: * representation of each source header. 44: */ 45: 46: /* 47: * cpu_task.h (EM1-D512) 48: * CPU-Dependent Task Start Processing 49: */ 50: 51: #ifndef _CPU_TASK_ 52: #define _CPU_TASK_ 53: 54: #include "cpu_insn.h" 55: 56: /* 57: * System stack configuration at task startup 58: */ 59: typedef struct { 60: VW r[12]; /* R0-R11 */ 61: UW taskmode; 62: void *usp; /* R13_usr */ 63: void *lr_usr; /* R14_usr */ 64: void *lr_svc; /* R14_svc */ 65: VW ip; /* R12 */ 66: void *pc; /* R15 */ 67: VW spsr_svc; 68: } SStackFrame; 69: 70: /* 71: * User stack configuration at task startup (only RNG 1-3) 72: */ 73: typedef struct { 74: /* Empty */ 75: } UStackFrame; 76: 77: /* 78: * Size of system stack area destroyed by 'make_dormant()' 79: * In other words, the size of area required to write by 'setup_context().' 80: */ 81: #define DORMANT_STACK_SIZE ( sizeof(VW) * 7 ) /* To 'taskmode' */ 82: 83: /* 84: * Size of area kept for special use from system stack 85: */ 86: #define RESERVE_SSTACK(tskatr) 0 87: 88: /* 89: * Initial value for task startup 90: */ 91: #if USE_MMU 92: #define INIT_PSR(rng) ( ( (rng) == 0 )? PSR_SVC: \ 93: ( (rng) >= MMU_MIN_USER_LEVEL )? PSR_USR: PSR_SYS ) 94: #else 95: #define INIT_PSR(rng) ( ( (rng) == 0 )? PSR_SVC: PSR_SYS ) 96: #endif 97: 98: #define INIT_TMF(rng) ( TMF_PPL(rng) | TMF_CPL(rng) ) 99: 100: /* 101: * Switch task space 102: */ 103: Inline void change_space( void *uatb, INT lsid ) 104: { 105: UW ttbr; 106: 107: /* if no task space to switch to is not specified, use system default. */ 108: Asm("mrc p15, 0, %0, cr2, c0, 1": "=r"(ttbr)); /* TTBR1 */ 109: if ( uatb != NULL ) { 110: ttbr = (UW)uatb | (ttbr & 0x07f); 111: } 112: 113: /* To synchronize ASID and TTBR change, set ASID to a meaningless value temporarily. */ 114: Asm("mcr p15, 0, %0, cr13, c0, 1":: "r"(0)); /* CONTEXTIDR */ 115: ISB(); 116: Asm("mcr p15, 0, %0, cr2, c0, 0":: "r"(ttbr)); /* TTBR0 */ 117: Asm("mcr p15, 0, %0, cr13, c0, 1":: "r"(lsid)); /* CONTEXTIDR */ 118: ISB(); 119: } 120: 121: /* 122: * Create stack frame for task startup 123: * Call from 'make_dormant()' 124: */ 125: Inline void setup_context( TCB *tcb ) 126: { 127: SStackFrame *ssp; 128: W rng; 129: UW pc, spsr; 130: 131: rng = (tcb->tskatr & TA_RNG3) >> 8; 132: ssp = tcb->isstack; 133: ssp--; 134: 135: spsr = INIT_PSR(rng); 136: pc = (UW)tcb->task; 137: if ( (pc & 1) != 0 ) { 138: spsr |= PSR_T; /* Thumb mode */ 139: } 140: 141: /* CPU context initialization */ 142: ssp->taskmode = INIT_TMF(rng); /* Initial taskmode */ 143: ssp->spsr_svc = spsr; /* Initial SR */ 144: ssp->pc = (void*)(pc & ~0x00000001U); /* Task startup address */ 145: tcb->tskctxb.ssp = ssp; /* System stack */ 146: tcb->tskctxb.svc_ssp = NULL; /* ssp when SVC is called */ 147: 148: if ( rng > 0 ) { 149: ssp->usp = tcb->istack; /* User stack */ 150: } 151: } 152: 153: /* 154: * Set task startup code 155: * Called by 'tk_sta_tsk()' processing. 156: */ 157: Inline void setup_stacd( TCB *tcb, INT stacd ) 158: { 159: SStackFrame *ssp = tcb->tskctxb.ssp; 160: 161: ssp->r[0] = stacd; 162: ssp->r[1] = (VW)tcb->exinf; 163: } 164: 165: /* 166: * Delete task contexts 167: */ 168: Inline void cleanup_context( TCB *tcb ) 169: { 170: } 171: 172: #endif /* _CPU_TASK_ */