1/** 2 * \file 3 * \brief Kernel control block declarations. 4 */ 5 6/* 7 * Copyright (c) 2013, 2014, ETH Zurich. 8 * All rights reserved. 9 * 10 * This file is distributed under the terms in the attached LICENSE file. 11 * If you do not find this file, copies can be found by writing to: 12 * ETH Zurich D-INFK, Universitaetstr. 6, CH-8092 Zurich. Attn: Systems Group. 13 */ 14 15#ifndef KCB_H 16#define KCB_H 17 18#include <kernel.h> 19#include <capabilities.h> 20#include <irq.h> 21#include <mdb/mdb_tree.h> 22 23struct cte; 24struct dcb; 25 26enum sched_state { 27 SCHED_RR, 28 SCHED_RBED, 29}; 30 31/** 32 * this is the memory layout of ObjType_KernelControlBlock 33 * this struct should contain all the persistent state that belongs to a 34 * kernel. 35 */ 36struct kcb { 37 bool is_valid; ///< kcb has been initialized by a kernel before 38 39 /// kcb scheduling ring. 40 /// These fields point to the next and previous kcb that should be 41 /// scheduled when we're running multiple kcbs on the same kernel. 42 /// invariant: next == NULL --> prev == NULL 43 /// invariant: next is the next kcb in the ring and prev is the previous 44 /// kcb in the ring 45 struct kcb *next, *prev; 46 47 /// mdb root node 48 lvaddr_t mdb_root; 49 // XXX: need memory for a rootcn here because we can't have it static in 50 // the kernel data section anymore 51 struct cte init_rootcn; 52 53 /// which scheduler state is valid 54 enum sched_state sched; 55 /// RR scheduler state 56 struct dcb *ring_current; 57 /// RBED scheduler state 58 struct dcb *queue_head, *queue_tail; 59 unsigned int u_hrt, u_srt, w_be, n_be; 60 /// current time since kernel start in timeslices. This is necessary to 61 /// make the scheduler work correctly 62 /// wakeup queue head 63 struct dcb *wakeup_queue_head; 64 /// last value of kernel_now before shutdown/migration 65 //needs to be signed because it's possible to migrate a kcb onto a cpu 66 //driver whose kernel_now > this kcb's kernel_off. 67 int64_t kernel_off; 68 69 uint8_t irq_in_use[NDISPATCH / 8]; // Bitmap of handed out caps. 70 struct cte irq_dispatch[NDISPATCH]; 71 // TODO: maybe add a shared part which can replace struct core_data? 72}; 73 74///< The kernel control block 75extern struct kcb *kcb_current; 76///< flag that indicates whether kcb scheduling should happen 77extern bool kcb_sched_suspended; 78 79static inline void print_kcb(void) 80{ 81 printk(LOG_DEBUG, "kcb contents:\n"); 82 printk(LOG_DEBUG, " next = %p, prev = %p\n", 83 kcb_current->next, kcb_current->prev); 84 printk(LOG_DEBUG, " mdb_root = 0x%"PRIxLVADDR"\n", kcb_current->mdb_root); 85 printk(LOG_DEBUG, " queue_head = %p\n", kcb_current->queue_head); 86 printk(LOG_DEBUG, " queue_tail = %p\n", kcb_current->queue_tail); 87 printk(LOG_DEBUG, " wakeup_queue_head = %p\n", kcb_current->wakeup_queue_head); 88 printk(LOG_DEBUG, " u_hrt = %u, u_srt = %u, w_be = %u, n_be = %u\n", 89 kcb_current->u_hrt, kcb_current->u_srt, kcb_current->w_be, 90 kcb_current->n_be); 91 // TODO interrupt state 92} 93 94// XXX: this is from RBED, don't know how to properly have this here -SG 95extern struct dcb *queue_tail; 96static inline void switch_kcb(struct kcb *next) 97{ 98 assert (next != NULL); 99 kcb_current = next; 100 mdb_init(kcb_current); 101 // update queue tail to make associated assembly not choke 102 queue_tail = kcb_current->queue_tail; 103} 104 105void kcb_add(struct kcb* new_kcb); 106errval_t kcb_remove(struct kcb *to_remove); 107void kcb_update_core_id(struct kcb *kcb); 108 109#endif 110