phys_window.c

Go to the documentation of this file.

#include "phys_window.h"
#include "autoconf.h"
#include <hal/cpu/paging.h>
#include <libk/serial.h>
#include <memory/vm_manager.h>
 
static mem_physwindow_t physical_memory_windows[VOXIA_PHYS_MAX_WINDOW_COUNT] = {
    0};
 
extern void paging_physwindow_mmap(page_t page_dir, uint64_t virt,
                   uint64_t phys, int flags);

mem_physwindow_t* mem_resolve_physwindow(uintptr_t virt_addr) {
    for (size_t i = 0; i < VOXIA_PHYS_MAX_WINDOW_COUNT; i++) {
        if (physical_memory_windows[i].virt_addr == virt_addr) {
            return &physical_memory_windows[i];
        }
    }
    return 0;
}
 
mem_physwindow_status_t
mem_create_physwindow(uintptr_t phys_addr, uintptr_t* virt_addr,
              mem_physwindow_flag_t flag) {
    for (size_t i = 0; i < VOXIA_PHYS_MAX_WINDOW_COUNT; i++) {
        if (!physical_memory_windows[i].lock) {
            *virt_addr = mem_vma_phys_window_start + i * 0x1000;
            physical_memory_windows[i].virt_addr = *virt_addr;
            physical_memory_windows[i].phys_addr = phys_addr;
            physical_memory_windows[i].flag = flag;
 
            paging_physwindow_mmap(
                paging_get_highest_page_map(), *virt_addr,
                phys_addr,
                (flag == PHYS_WINDOW_FLAG_READ ? 0b1 : 0)
                    | (flag == PHYS_WINDOW_FLAG_WRITE ? 0b10
                                      : 0b0)
                    | 0b11);
 
            if ((flag & PHYS_WINDOW_FLAG_LOCK)
                == PHYS_WINDOW_FLAG_LOCK) {
                physical_memory_windows[i].lock = 1;
            }
 
            // serial_trace("mem_create_physwindow: Created physical window at %d\n", i);
 
            return PHYS_WINDOW_STATUS_OK;
        }
    }
    serial_trace("[ERROR] mem_create_physwindow: No available physical "
             "window slots\n");
    return PHYS_WINDOW_STATUS_NOT_FOUND;
}
 
mem_physwindow_status_t mem_release_physwindow(uintptr_t virt_addr) {
    for (size_t i = 0; i < VOXIA_PHYS_MAX_WINDOW_COUNT; i++) {
        if (physical_memory_windows[i].virt_addr == virt_addr) {
            physical_memory_windows[i].lock = 0;
            return PHYS_WINDOW_STATUS_OK;
        }
    }
 
#if VOXIA_LOG_VERBOSE
    serial_trace("[WARNING] mem_release_physwindow: Virtual address 0x%x "
             "not found in physical "
             "memory windows\n",
             virt_addr);
#endif
    return PHYS_WINDOW_STATUS_NOT_FOUND;
}