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#include <string.h>
#include <stdlib.h>
#include <com32.h>
#include "core.h"
#include "thread.h"
#define REAL_MODE_STACK_SIZE 4096
#define MIN_STACK_SIZE 16384
#define THREAD_ALIGN 64 /* Thread alignment */
extern void __start_thread(void);
struct thread *start_thread(const char *name, size_t stack_size, int prio,
void (*start_func)(void *), void *func_arg)
{
irq_state_t irq;
struct thread *curr, *t;
char *stack, *rmstack;
const size_t thread_mask = THREAD_ALIGN - 1;
struct thread_stack *sp;
if (stack_size < MIN_STACK_SIZE)
stack_size = MIN_STACK_SIZE;
stack_size = (stack_size + thread_mask) & ~thread_mask;
stack = malloc(stack_size + sizeof(struct thread));
if (!stack)
return NULL;
rmstack = lmalloc(REAL_MODE_STACK_SIZE);
if (!rmstack) {
free(stack);
return NULL;
}
t = (struct thread *)stack;
memset(t, 0, sizeof *t);
t->stack = stack;
t->rmstack = rmstack;
stack += sizeof(struct thread);
/* sp allocated from the end of the stack */
sp = (struct thread_stack *)(stack + stack_size) - 1;
t->esp = sp;
sp->errno = 0;
sp->rmss = SEG(rmstack);
sp->rmsp = REAL_MODE_STACK_SIZE;
sp->esi = (size_t)start_func;
sp->edi = (size_t)func_arg;
sp->ebx = irq_state(); /* Inherit the IRQ state from the spawner */
sp->eip = __start_thread;
t->prio = prio;
t->name = name;
irq = irq_save();
curr = current();
t->thread_magic = THREAD_MAGIC;
t->list.prev = &curr->list;
t->list.next = curr->list.next;
curr->list.next = &t->list;
t->list.next->prev = &t->list;
__schedule();
irq_restore(irq);
return t;
}
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