sys/message.c


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#include "message.h"
#include "api/error.h"
#include "errno.h"
#include "hal/memory.h"
#include "hal/obj.h"
#include "lib/printf.h"

int
message_hasmap(jove_owned_obj_t *obj)
{
    return obj_getvalue(obj) & 1;
}

uintptr_t
message_unmap(jove_owned_obj_t *obj, jove_owned_obj_t *pagedir)
{
    if(message_hasmap(obj) == 0) {
        kprintf("Message %p doesn't have a map\n", obj_getvalue(obj));
        return -ENOMAP;
    }
    uintptr_t vptr = obj->locked.value & ~0xFFFULL;
    uintptr_t *mapping = pagedir_get_mapping(pagedir, vptr);

    pagedir_mapping_set_present(mapping, false);
    pagedir_invlpg(vptr);

    obj_setvalue(obj, *mapping);
    return vptr;
}

void 
message_remap(jove_owned_obj_t *message, jove_owned_obj_t *pagedir, uintptr_t vptr)
{
    if(message_hasmap(message)) {
        errno = -EHASMAP;
        return;
    }

    uintmax_t *mapping = pagedir_get_mapping(pagedir, vptr);

    *mapping = obj_getvalue(message) | 1;
    pagedir_invlpg(vptr);

    obj_setvalue(message, vptr | 1);
}

uintptr_t message_getdata(jove_owned_obj_t *message)
{
    if(message_hasmap(message))
        return obj_getvalue(message) & ~0xFFFULL;

    uintptr_t message_val = obj_getvalue(message);
    return pagedir_ident_from_mapping(&message_val);
}