/* * hal_context.c - implementation of Thread Context API for TSAR-MIPS32 * * Author Alain Greiner (2016) * * Copyright (c) UPMC Sorbonne Universites * * This file is part of ALMOS-MKH. * * ALMOS-MKH.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; version 2.0 of the License. * * ALMOS-MKH.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 ALMOS-MKH.; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include ///////////////////////////////////////////////////////////////////////////////////////// // Define various SR values for TSAR-MIPS32 ///////////////////////////////////////////////////////////////////////////////////////// #define SR_USR_MODE 0xFC11 #define SR_USR_MODE_FPU 0x2000FC11 #define SR_SYS_MODE 0xFC00 ///////////////////////////////////////////////////////////////////////////////////////// // These structuree defines the cpu_context anf fpu_context for TSAR MIPS32. // These registers are saved/restored at each context switch. // WARNING : update the hal_***_context_save() and hal_***_context_restore() // functions when modifying this structure, and check the two // CONFIG_CPU_CTX_SIZE & CONFIGFPU_CTX_SIZE configuration parameterss. ///////////////////////////////////////////////////////////////////////////////////////// typedef struct hal_cpu_context_s { uint32_t c0_epc; // slot 0 uint32_t at_01; // slot 1 uint32_t v0_02; // slot 2 uint32_t v1_03; // slot 3 uint32_t a0_04; // slot 4 uint32_t a1_05; // slot 5 uint32_t a2_06; // slot 6 uint32_t a3_07; // slot 7 uint32_t t0_08; // slot 8 uint32_t t1_09; // slot 9 uint32_t t2_10; // slot 10 uint32_t t3_11; // slot 11 uint32_t t4_12; // slot 12 uint32_t t5_13; // slot 13 uint32_t t6_14; // slot 14 uint32_t t7_15; // slot 15 uint32_t s0_16; // slot 16 uint32_t s1_17; // slot 17 uint32_t s2_18; // slot 18 uint32_t s3_19; // slot 19 uint32_t s4_20; // slot 20 uint32_t s5_21; // slot 21 uint32_t s6_22; // slot 22 uint32_t s7_23; // slot 23 uint32_t t8_24; // slot 24 uint32_t t8_25; // slot 25 uint32_t hi_26; // slot 26 uint32_t lo_27; // slot 27 uint32_t gp_28; // slot 28 uint32_t sp_29; // slot 29 uint32_t fp_30; // slot 30 uint32_t ra_31; // slot 31 uint32_t c2_ptpr; // slot 32 uint32_t c2_mode; // slot 33 uint32_t c0_sr; // slot 34 uint32_t c0_th; // slot 35 } hal_cpu_context_t; ///////////////////////////////////////////////////////////////////////////////////////// // This structure defines the fpu_context for TSAR MIPS32. ///////////////////////////////////////////////////////////////////////////////////////// typedef struct hal_fpu_context_s { uint32_t fpu_regs[32]; } hal_fpu_context_t; ///////////////////////////////////////////////////////////////////////////////////////// // CPU context access functions ///////////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////// // Seven registers are initialised by this function: // GPR : sp_29 / fp_30 / ra_31 // CP0 : c0_sr / c0_th // CP2 : c2_ptpr / c2_mode ///////////////////////////////////////////////////////////////////////////////////////// error_t hal_cpu_context_create( thread_t * thread ) { kmem_req_t req; context_dmsg("\n[INFO] %s : enters for thread %x in process %x\n", __FUNCTION__ , thread->trdid , thread->process->pid ); // allocate memory for cpu_context req.type = KMEM_CPU_CTX; req.size = sizeof(hal_cpu_context_t); req.flags = AF_KERNEL | AF_ZERO; hal_cpu_context_t * context = (hal_cpu_context_t *)kmem_alloc( &req ); if( context == NULL ) return ENOMEM; // set cpu context pointer in thread thread->cpu_context = (void*)context; // stack pointer, status register and mmu_mode depends on thread type uint32_t sp_29; uint32_t c0_sr; uint32_t c2_mode; if( thread->type == THREAD_USER ) { sp_29 = ((uint32_t)thread->u_stack_base) + thread->u_stack_size; c0_sr = SR_USR_MODE; c2_mode = 0xF; } else { sp_29 = ((uint32_t)thread->k_stack_base) + thread->k_stack_size; c0_sr = SR_SYS_MODE; c2_mode = 0x3; } // align stack pointer on a double word boundary sp_29 = (sp_29 - 8) & (~ 0x7); // initialise context context->sp_29 = sp_29; context->fp_30 = sp_29; // TODO check this [AG] context->ra_31 = (uint32_t)thread->entry_func; context->c0_sr = c0_sr; context->c0_th = (uint32_t)thread; context->c2_ptpr = (uint32_t)((thread->process->vmm.gpt.ppn) >> 1); context->c2_mode = c2_mode; context_dmsg("\n[INFO] %s : exit for thread %x in process %x / ra = %x\n", __FUNCTION__ , thread->trdid , thread->process->pid , context->ra_31 ); return 0; } // end hal_cpu_context_create() ///////////////////////////////////////////////// void hal_cpu_context_display( thread_t * thread ) { hal_cpu_context_t * ctx = (hal_cpu_context_t *)thread->cpu_context; printk("\n*** cpu_context for thread %x in cluster %x / ctx = %x ***\n" " gp_28 = %X sp_29 = %X ra_31 = %X\n" " c0_sr = %X c0_epc = %X c0_th = %X\n" " c2_ptpr = %X c2_mode = %X\n", thread->trdid, local_cxy, ctx, ctx->gp_28 , ctx->sp_29 , ctx->ra_31, ctx->c0_sr , ctx->c0_epc , ctx->c0_th, ctx->c2_ptpr , ctx->c2_mode ); } ///////////////////////////////////////////////////////////////////////////////////////// // These registers are saved to CPU context defined by argument. // - GPR : all, but (zero, k0, k1), plus (hi, lo) // - CP0 : c0_th , c0_sr // - CP2 : c2_ptpr , C2_mode, C2_epc ///////////////////////////////////////////////////////////////////////////////////////// void hal_cpu_context_save( void * ctx ) { asm volatile( ".set noat \n" ".set noreorder \n" "move $26, $4 \n" /* $26 <= &ctx */ "mfc0 $27, $14 \n" "sw $27, 0*4($26) \n" /* save c0_epc to slot 0 */ "sw $1, 1*4($26) \n" "sw $2, 2*4($26) \n" "sw $3, 3*4($26) \n" "sw $4, 4*4($26) \n" "sw $5, 5*4($26) \n" "sw $6, 6*4($26) \n" "sw $7, 7*4($26) \n" "sw $8, 8*4($26) \n" "sw $9, 9*4($26) \n" "sw $10, 10*4($26) \n" "sw $11, 11*4($26) \n" "sw $12, 12*4($26) \n" "sw $13, 13*4($26) \n" "sw $14, 14*4($26) \n" "sw $15, 15*4($26) \n" "sw $16, 16*4($26) \n" "sw $17, 17*4($26) \n" "sw $18, 18*4($26) \n" "sw $19, 19*4($26) \n" "sw $20, 20*4($26) \n" "sw $21, 21*4($26) \n" "sw $22, 22*4($26) \n" "sw $23, 23*4($26) \n" "sw $24, 24*4($26) \n" "sw $25, 25*4($26) \n" "mfhi $27 \n" "sw $27, 26*4($26) \n" /* save hi to slot 26 */ "mflo $27 \n" "sw $27, 27*4($26) \n" /* save lo to slot 27 */ "sw $28, 28*4($26) \n" "sw $29, 29*4($26) \n" "sw $30, 30*4($26) \n" "sw $31, 31*4($26) \n" "mfc2 $27, $0 \n" "sw $27, 32*4($26) \n" /* save c2_ptpr to slot 32 */ "mfc2 $27, $1 \n" "sw $27, 33*4($26) \n" /* save c2_mode to slot 33 */ "mfc0 $27, $12 \n" "sw $27, 34*4($26) \n" /* save c0_sr to slot 34 */ "mfc0 $27, $4, 2 \n" "sw $27, 35*4($26) \n" /* save c0_th to slot 35 */ "sync \n" "move $4, $27 \n" "jal hal_cpu_context_display \n" /* display context */ "nop \n" ".set reorder \n" ".set at \n" : : : "$26" , "$27" , "memory" ); } ///////////////////////////////////////////////////////////////////////////////////////// // These registers are restored from cpu context defined by argument: // - GPR : all, but (zero, k0, k1), plus (hi, lo) // - CP0 : c0_th , c0_sr // - CP2 : c2_ptpr , C2_mode ///////////////////////////////////////////////////////////////////////////////////////// void hal_cpu_context_restore( void * ctx ) { asm volatile( ".set noat \n" ".set noreorder \n" "move $26, $4 \n" /* $26 <= &ctx */ "lw $4, 35*4($26) \n" "jal hal_cpu_context_display \n" /* display context */ "nop \n" "lw $27, 0*4($26) \n" "mtc0 $27, $14 \n" /* restore C0_epc from slot 0 */ "lw $1, 1*4($26) \n" "lw $2, 2*4($26) \n" "lw $3, 3*4($26) \n" "lw $4, 4*4($26) \n" "lw $5, 5*4($26) \n" "lw $6, 6*4($26) \n" "lw $7, 7*4($26) \n" "lw $8, 8*4($26) \n" "lw $9, 9*4($26) \n" "lw $10, 10*4($26) \n" "lw $11, 11*4($26) \n" "lw $12, 12*4($26) \n" "lw $13, 13*4($26) \n" "lw $14, 14*4($26) \n" "lw $15, 15*4($26) \n" "lw $16, 16*4($26) \n" "lw $17, 17*4($26) \n" "lw $18, 18*4($26) \n" "lw $19, 19*4($26) \n" "lw $20, 20*4($26) \n" "lw $21, 21*4($26) \n" "lw $22, 22*4($26) \n" "lw $23, 23*4($26) \n" "lw $24, 24*4($26) \n" "lw $25, 25*4($26) \n" "lw $27, 26*4($26) \n" "mthi $27 \n" /* restore hi from slot 26 */ "lw $27, 27*4($26) \n" "mtlo $27 \n" /* restote lo from slot 27 */ "lw $28, 28*4($26) \n" "lw $29, 29*4($26) \n" "lw $30, 30*4($26) \n" "lw $31, 31*4($26) \n" "lw $27, 32*4($26) \n" "mtc2 $27, $0 \n" /* restore c2_ptpr from slot 32 */ "lw $27, 33*4($26) \n" "mtc2 $27, $1 \n" /* restore c2_mode from slot 33 */ "lw $27, 34*4($26) \n" "mtc0 $27, $12 \n" /* restore c0_sr from slot 34 */ "lw $27, 35*4($26) \n" "mtc0 $27, $4, 2 \n" /* restore co_th from slot 35 */ ".set reorder \n" ".set at \n" : : : "$26" , "$27" ); } ///////////////////////////////////////////// error_t hal_cpu_context_copy( thread_t * dst, thread_t * src ) { kmem_req_t req; // allocate memory for dst cpu_context req.type = KMEM_CPU_CTX; req.size = sizeof(hal_cpu_context_t); req.flags = AF_KERNEL | AF_ZERO; hal_cpu_context_t * dst_context = (hal_cpu_context_t *)kmem_alloc( &req ); if( dst_context == NULL ) return ENOMEM; // set cpu context pointer in dst thread dst->cpu_context = dst_context; // get cpu context pointer from src thread hal_cpu_context_t * src_context = src->cpu_context; // copy CPU context from src to dst memcpy( dst_context , src_context , sizeof(hal_cpu_context_t) ); return 0; } // end hal_cpu_context_copy() ///////////////////////////////////////////////// void hal_cpu_context_destroy( thread_t * thread ) { kmem_req_t req; req.type = KMEM_CPU_CTX; req.ptr = thread->cpu_context; kmem_free( &req ); } // end hal_cpu_context_destroy() /////////////////////////////////////////////////// error_t hal_fpu_context_create( thread_t * thread ) { kmem_req_t req; // allocate memory for uzone req.type = KMEM_FPU_CTX; req.size = sizeof(hal_fpu_context_t); req.flags = AF_KERNEL | AF_ZERO; hal_fpu_context_t * context = (hal_fpu_context_t *)kmem_alloc( &req ); if( context == NULL ) return ENOMEM; // set fpu context pointer in thread thread->fpu_context = (void*)context; return 0; } // hal_fpu_context_create() ///////////////////////////////////////////// error_t hal_fpu_context_copy( thread_t * dst, thread_t * src ) { kmem_req_t req; // allocate memory for dst fpu_context req.type = KMEM_FPU_CTX; req.size = sizeof(hal_fpu_context_t); req.flags = AF_KERNEL | AF_ZERO; hal_fpu_context_t * dst_context = (hal_fpu_context_t *)kmem_alloc( &req ); if( dst_context == NULL ) return ENOMEM; // set fpu context pointer in dst thread dst->fpu_context = (void*)dst_context; // get fpu context pointer from src thread hal_fpu_context_t * src_context = src->fpu_context; // copy CPU context from src to dst memcpy( dst_context , src_context , sizeof(hal_fpu_context_t) ); return 0; } // end hal_fpu_context_copy() ///////////////////////////////////////////////// void hal_fpu_context_destroy( thread_t * thread ) { kmem_req_t req; req.type = KMEM_FPU_CTX; req.ptr = thread->fpu_context; kmem_free( &req ); } // end hal_fpu_context_destroy() ///////////////////////////////////////////////////////////////////////////////////////// // These registers are initialised: // - GPR : sp_29 , fp_30 , a0 // - CP0 : c0_sr , c0_epc , c0_th // - CP2 : C2_ptpr , c2_mode // TODO Quand cette fonction est-elle appelée? [AG] ///////////////////////////////////////////////////////////////////////////////////////// void hal_cpu_context_load( thread_t * thread ) { // get relevant values from thread context hal_cpu_context_t * ctx = (hal_cpu_context_t *)thread->cpu_context; uint32_t sp_29 = ctx->sp_29; uint32_t fp_30 = ctx->fp_30; uint32_t c0_th = ctx->c0_th; uint32_t c0_sr = ctx->c0_sr; uint32_t c2_ptpr = ctx->c2_ptpr; uint32_t c2_mode = ctx->c2_mode; // get pointer on entry function & argument from thread attributes uint32_t func = (uint32_t)thread->entry_func; uint32_t args = (uint32_t)thread->entry_args; // reset loadable field in thread descriptor thread->flags &= ~THREAD_FLAG_LOADABLE; // load registers asm volatile( ".set noreorder \n" "or $26, %0, $0 \n" /* $26 <= stack pointer */ "or $27, %2, $0 \n" /* $27 <= status register */ "addiu $26, $26, -4 \n" /* decrement stack pointer */ "or $4, %7, $0 \n" /* load a0 */ "sw $4, ($26) \n" /* set entry_args in stack */ "ori $27, $27, 0x2 \n" /* set EXL flag in status register */ "mtc0 $27, $12 \n" /* load c0_sr */ "mtc0 %3, $4, 2 \n" /* load c0_th */ "mtc2 %4, $0 \n" /* load c2 ptpr */ "mtc0 %6, $14 \n" /* load c0_epc */ "or $29, $16, $0 \n" /* load sp_29 */ "or $30, %1, $0 \n" /* load fp_30 */ "mtc2 %5, $1 \n" /* load c2_mode */ "nop \n" "eret \n" /* jump to user code */ "nop \n" ".set reorder \n" : : "r"(sp_29),"r"(fp_30),"r"(c0_sr),"r"(c0_th), "r"(c2_ptpr),"r"(c2_mode),"r"(func),"r"(args) : "$4","$26","$27","$29","$30" ); } // end hal_cpu_context_load() ////////////////////////////////////////////// void hal_fpu_context_save( thread_t * thread ) { uint32_t ctx = (uint32_t)thread->fpu_context; asm volatile( ".set noreorder \n" "swc1 $f0, 0*4(%0) \n" "swc1 $f1, 1*4(%0) \n" "swc1 $f2, 2*4(%0) \n" "swc1 $f3, 3*4(%0) \n" "swc1 $f4, 4*4(%0) \n" "swc1 $f5, 5*4(%0) \n" "swc1 $f6, 6*4(%0) \n" "swc1 $f7, 7*4(%0) \n" "swc1 $f8, 8*4(%0) \n" "swc1 $f9, 9*4(%0) \n" "swc1 $f10, 10*4(%0) \n" "swc1 $f11, 11*4(%0) \n" "swc1 $f12, 12*4(%0) \n" "swc1 $f13, 13*4(%0) \n" "swc1 $f14, 14*4(%0) \n" "swc1 $f15, 15*4(%0) \n" "swc1 $f16, 16*4(%0) \n" "swc1 $f17, 17*4(%0) \n" "swc1 $f18, 18*4(%0) \n" "swc1 $f19, 19*4(%0) \n" "swc1 $f20, 20*4(%0) \n" "swc1 $f21, 21*4(%0) \n" "swc1 $f22, 22*4(%0) \n" "swc1 $f23, 23*4(%0) \n" "swc1 $f24, 24*4(%0) \n" "swc1 $f25, 25*4(%0) \n" "swc1 $f26, 26*4(%0) \n" "swc1 $f27, 27*4(%0) \n" "swc1 $f28, 28*4(%0) \n" "swc1 $f29, 29*4(%0) \n" "swc1 $f30, 30*4(%0) \n" "swc1 $f31, 31*4(%0) \n" ".set reorder \n" : : "r"(ctx) ); } // end hal_cpu_context_save() ///////////////////////////////////////////////// void hal_fpu_context_restore( thread_t * thread ) { uint32_t ctx = (uint32_t)thread->fpu_context; asm volatile( ".set noreorder \n" "lwc1 $f0, 0*4(%0) \n" "lwc1 $f1, 1*4(%0) \n" "lwc1 $f2, 2*4(%0) \n" "lwc1 $f3, 3*4(%0) \n" "lwc1 $f4, 4*4(%0) \n" "lwc1 $f5, 5*4(%0) \n" "lwc1 $f6, 6*4(%0) \n" "lwc1 $f7, 7*4(%0) \n" "lwc1 $f8, 8*4(%0) \n" "lwc1 $f9, 9*4(%0) \n" "lwc1 $f10, 10*4(%0) \n" "lwc1 $f11, 11*4(%0) \n" "lwc1 $f12, 12*4(%0) \n" "lwc1 $f13, 13*4(%0) \n" "lwc1 $f14, 14*4(%0) \n" "lwc1 $f15, 15*4(%0) \n" "lwc1 $f16, 16*4(%0) \n" "lwc1 $f17, 17*4(%0) \n" "lwc1 $f18, 18*4(%0) \n" "lwc1 $f19, 19*4(%0) \n" "lwc1 $f20, 20*4(%0) \n" "lwc1 $f21, 21*4(%0) \n" "lwc1 $f22, 22*4(%0) \n" "lwc1 $f23, 23*4(%0) \n" "lwc1 $f24, 24*4(%0) \n" "lwc1 $f25, 25*4(%0) \n" "lwc1 $f26, 26*4(%0) \n" "lwc1 $f27, 27*4(%0) \n" "lwc1 $f28, 28*4(%0) \n" "lwc1 $f29, 29*4(%0) \n" "lwc1 $f30, 30*4(%0) \n" "lwc1 $f31, 31*4(%0) \n" ".set reorder \n" : : "r"(ctx) ); } // end hal_cpu_context_restore() ///////////////////////////////////// void hal_fpu_context_dup( xptr_t dst, xptr_t src ) { hal_remote_memcpy( dst , src , sizeof(hal_fpu_context_t) ); }