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/*
* Copyright (c) 2012 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/>.
*/
#include <kern/error.h>
#include <kern/init.h>
#include <kern/kmem.h>
#include <kern/param.h>
#include <kern/stddef.h>
#include <kern/string.h>
#include <kern/thread.h>
#include <machine/cpu.h>
#include <machine/tcb.h>
#include <machine/trap.h>
static struct kmem_cache tcb_cache;
void __init
tcb_setup(void)
{
kmem_cache_init(&tcb_cache, "tcb", sizeof(struct tcb),
0, NULL, NULL, NULL, 0);
}
#ifdef __LP64__
static void
tcb_init_stack(struct tcb *tcb, void *stack, const struct thread *thread)
{
struct trap_frame *frame;
frame = (struct trap_frame *)(stack + STACK_SIZE) - 1;
memset(frame, 0, sizeof(*frame));
frame->rdi = (unsigned long)thread;
frame->rip = (unsigned long)thread_main;
frame->cs = CPU_GDT_SEL_CODE;
frame->rflags = CPU_EFL_IF | CPU_EFL_ONE;
frame->rsp = (unsigned long)(stack + STACK_SIZE);
frame->ss = CPU_GDT_SEL_DATA;
tcb->frame = frame;
}
#else /* __LP64__ */
static void
tcb_init_stack(struct tcb *tcb, void *stack, const struct thread *thread)
{
struct trap_frame *frame;
const struct thread **arg;
const void **ret_addr;
void *ptr;
size_t size;
/* Fake a function call (return address and argument) */
ptr = stack + STACK_SIZE - (2 * sizeof(long));
ret_addr = ptr;
*ret_addr = 0;
arg = ptr + sizeof(long);
*arg = thread;
/* Exclude user space stack registers */
size = sizeof(*frame) - (2 * sizeof(long));
frame = ptr - size;
memset(frame, 0, size);
frame->ds = CPU_GDT_SEL_DATA;
frame->es = CPU_GDT_SEL_DATA;
frame->fs = CPU_GDT_SEL_CPU;
frame->gs = CPU_GDT_SEL_NULL;
frame->eip = (unsigned long)thread_main;
frame->cs = CPU_GDT_SEL_CODE;
frame->eflags = CPU_EFL_IF | CPU_EFL_ONE;
tcb->frame = frame;
}
#endif /* __LP64__ */
int
tcb_create(struct tcb **tcbp, void *stack, const struct thread *thread)
{
struct tcb *tcb;
tcb = kmem_cache_alloc(&tcb_cache);
if (tcb == NULL)
return ERROR_NOMEM;
tcb_init_stack(tcb, stack, thread);
*tcbp = tcb;
return 0;
}
void
tcb_load(struct tcb *tcb)
{
trap_load(tcb->frame);
}
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