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/*
* Copyright (c) 2012-2017 Richard Braun.
*
* This program 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.
*
* This program 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 <http://www.gnu.org/licenses/>.
*
*
* Thread control block.
*/
#ifndef X86_TCB_H
#define X86_TCB_H
#include <assert.h>
#include <stdint.h>
#include <stdnoreturn.h>
#include <kern/init.h>
#include <machine/cpu.h>
#include <machine/page.h>
/*
* Thread stack size.
*/
#define TCB_STACK_SIZE PAGE_SIZE
/*
* Forward declaration.
*/
struct pmap_update_oplist;
/*
* Thread control block.
*/
struct tcb {
uintptr_t bp;
uintptr_t sp;
struct pmap_update_oplist *oplist;
};
/*
* Build a TCB.
*
* Prepare the given stack for execution. The context is defined so that it
* will call thread_main(fn, arg) when loaded.
*
* In addition, initialize any thread-local machine-specific data.
*/
int tcb_build(struct tcb *tcb, void *stack, void (*fn)(void *), void *arg);
/*
* Release all resources held by a TCB.
*/
void tcb_cleanup(struct tcb *tcb);
static inline struct tcb *
tcb_current(void)
{
extern struct tcb *tcb_current_ptr;
return cpu_local_read(tcb_current_ptr);
}
static inline void
tcb_set_current(struct tcb *tcb)
{
extern struct tcb *tcb_current_ptr;
cpu_local_assign(tcb_current_ptr, tcb);
}
static inline void
tcb_set_pmap_update_oplist(struct tcb *tcb, struct pmap_update_oplist *oplist)
{
tcb->oplist = oplist;
}
static inline struct pmap_update_oplist *
tcb_get_pmap_update_oplist(struct tcb *tcb)
{
return tcb->oplist;
}
/*
* Load a TCB.
*
* Called with interrupts disabled. The caller context is lost.
*/
noreturn void tcb_load(struct tcb *tcb);
/*
* Context switch.
*
* Called with interrupts disabled.
*/
static inline void
tcb_switch(struct tcb *prev, struct tcb *next)
{
void tcb_context_switch(struct tcb *prev, struct tcb *next);
assert(!cpu_intr_enabled());
tcb_set_current(next);
tcb_context_switch(prev, next);
}
/*
* Dump the stack trace of a TCB.
*
* The thread associated to the TCB must not be running.
*/
void tcb_trace(const struct tcb *tcb);
/*
* This init operation provides :
* - current TCB handling
*/
INIT_OP_DECLARE(tcb_setup);
#endif /* X86_TCB_H */
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