arch/x86_64/memory/message.c


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#include <object.h>
#include <stddef.h>
#include <error.h>
#include <device/processor.h>
#include "arch/x86_64/page.h"
#include "arch/x86_64/page-mapping.h"
#include "print.h"

int
ko_message_unmap(objdir_entry_t *message, uintptr_t *saveptr)
{
    /* message data should point to the virtual address. */
    /* If it doesn't, fail*/
    if(!(message->extra & KODE_EX_MESSAGE_MAPPED)) return KE_BADCALL;
    uintptr_t vptr = message->data;

    processor_t *cproc = processor_current();
    pmle_t *pml4 = vmem_phys_tovirt(cproc->pdir);

    pmle_t *message_pmle = mem_mapping_vptr_mapping(pml4, 4, vptr);
    *saveptr = (uintptr_t)vmem_phys_tovirt(message_pmle->paddr << 12);

    message_pmle->p = 0;
    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");

    message->extra &= ~KODE_EX_MESSAGE_MAPPED;
    return 0;
}

int
ko_message_remap(objdir_entry_t *message)
{
    if(message->extra & KODE_EX_MESSAGE_MAPPED) return KE_BADCALL;
    uintptr_t vptr = message->data;
    
    processor_t *cproc = processor_current();
    pmle_t *pml4 = vmem_phys_tovirt(cproc->pdir);

    pmle_t *message_pmle = mem_mapping_vptr_mapping(pml4, 4, vptr);

    message_pmle->p = 1;
    __asm__ volatile("invlpg (%0)":: "r"(vptr): "memory");

    message->extra |= KODE_EX_MESSAGE_MAPPED;
    return 0;
}

void ko_message_move(objdir_entry_t *message, uintptr_t vptr);