物理内存管理

#include "los_vm_phys.h"

#define PHYS_PAGE_SIZE 0x4000

// 申请一个页
VOID OsPhysPagesAllocTest3(VOID)
{
    PADDR_T newPaddr;
    VOID *kvaddr = NULL;
    LosVmPage *newPage = NULL;

    newPage = LOS_PhysPageAlloc();
    if (newPage == NULL) {
        printf("LOS_PhysPageAlloc fail\n");
        return;
    }
    printf("LOS_PhysPageAlloc success\n");

    newPaddr = VM_PAGE_TO_PHYS(newPage);
    kvaddr = OsVmPageToVaddr(newPage);

    // Handle the physical memory

    // Free the physical memory
    LOS_PhysPageFree(newPage);
}

// 申请多个页，不要求连续
VOID OsPhysPagesAllocTest2(VOID)
{
    UINT32 sizeCount;
    UINT32 count;
    UINT32 size = PHYS_PAGE_SIZE;
    LosVmPage *vmPageArray[PHYS_PAGE_SIZE >> PAGE_SHIFT] = { NULL };
    UINT32 i = 0;
    LosVmPage *vmPage = NULL;
    PADDR_T pa;

    size = LOS_Align(size, PAGE_SIZE);
    if (size == 0) {
        return;
    }
    sizeCount = size >> PAGE_SHIFT;

    LOS_DL_LIST_HEAD(pageList);

    count = LOS_PhysPagesAlloc(sizeCount, &pageList);
    if (count < sizeCount) {
        printf("failed to allocate enough pages (ask %zu, got %zu)\n", sizeCount, count);
        goto ERROR;
    }
    printf("LOS_PhysPagesAlloc success\n");
    while ((vmPage = LOS_ListRemoveHeadType(&pageList, LosVmPage, node))) {
        pa = vmPage->physAddr;
        vmPageArray[i++] = vmPage;
        // Handle the physical memory
    }

    // Free the physical memory
    for (i = 0; i < sizeCount; ++i) {
        LOS_PhysPageFree(vmPageArray[i]);
    }

    return;

ERROR:
    (VOID)LOS_PhysPagesFree(&pageList);
}

// 申请多个连续页
VOID OsPhysPagesAllocTest1(VOID)
{
    VOID *ptr = NULL;
    LosVmPage *page = NULL;
    UINT32 size = PHYS_PAGE_SIZE;

    ptr = LOS_PhysPagesAllocContiguous(ROUNDUP(size, PAGE_SIZE) >> PAGE_SHIFT);
    if (ptr == NULL) {
        printf("LOS_PhysPagesAllocContiguous fail\n");
        return;
    }

    printf("LOS_PhysPagesAllocContiguous success\n");

    // Handle the physical memory

    // Free the physical memory
    page = OsVmVaddrToPage((VOID *)ptr);
    LOS_PhysPagesFreeContiguous((VOID *)ptr, size >> PAGE_SHIFT);
}

UINT32 ExamplePhyMemCaseEntry(VOID)
{
    OsPhysPagesAllocTest1();
    OsPhysPagesAllocTest2();
    OsPhysPagesAllocTest3();
    return LOS_OK;
}

LOS_PhysPagesAllocContiguous success
LOS_PhysPagesAlloc success
LOS_PhysPageAlloc success