Add some mem stat

core/main.c

@@ -101,10 +101,8 @@ void kmain(unsigned long magic, unsigned long addr)
         for (uint i = 0; i < size; i++) {
             printf("   base_addr 0x%llx, length = 0x%llx, type = 0x%x\n", mmap[i].addr,
                    mmap[i].len, (uint32_t)mmap[i].type);
-            memAddBank(
-                max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem),
-                min((multiboot_uint64_t)(upperMemKB * 1024), mmap[i].addr + mmap[i].len),
-                mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE);
+            memAddBank(max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem),
+                       mmap[i].addr + mmap[i].len, mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE);
         }
     } else {
         printf("Cannot get memory Mapping information, using default value\n");
@@ -134,7 +132,13 @@ void kmain(unsigned long magic, unsigned long addr)
 #ifdef RUN_TEST
     run_test();
 #endif
-    printf("\nSystem init done\n");
+    printf("\nSystem init done: ");
+
+    {
+        uint free, used;
+        memGetStat(&free, &used);
+        printf("%dKB free %dKB Used\n", free * (PAGE_SIZE / 1024), used * (PAGE_SIZE / 1024));
+    }
 
     // There is no real caller behind this point
     // So finish this by ourself

core/mem.c

@@ -1,3 +1,4 @@
+#include "assert.h"
 #include "mem.h"
 #include "kernel.h"
 #include "klibc.h"
@@ -7,6 +8,8 @@
 static struct memDesc *pageDesc = (struct memDesc *)&__ld_kernel_end;
 static struct memDesc *freePage;
 static struct memDesc *usedPage;
+paddr_t pageDescEnd;
+paddr_t upperMem;
 
 static unsigned long allocatedPage = 0;
 
@@ -24,8 +27,9 @@ int memSetup(paddr_t upperMemKB, paddr_t *lastMemUsedOut)
            nbPage, PAGE_SIZE);
 
     // Memory description is stored after the kernel. We need some place to store it
-    unsigned long pageDescEnd = (unsigned long)pageDesc + nbPage * sizeof(struct memDesc);
+    pageDescEnd     = (unsigned long)pageDesc + nbPage * sizeof(struct memDesc);
     *lastMemUsedOut = ALIGN(pageDescEnd, PAGE_SIZE);
+    upperMem        = upperMemKB * 1024;
 
     memAddBank(0, *lastMemUsedOut, 0);
     return 0;
@@ -33,6 +37,7 @@ int memSetup(paddr_t upperMemKB, paddr_t *lastMemUsedOut)
 
 int memAddBank(paddr_t bottomMem, paddr_t topMem, int isFree)
 {
+    topMem = min(topMem, upperMem);
     for (uint i = (bottomMem >> PAGE_SHIFT); i < (topMem >> PAGE_SHIFT); i++) {
         struct memDesc *mem = &pageDesc[i];
         if (isFree) {
@@ -48,6 +53,22 @@ int memAddBank(paddr_t bottomMem, paddr_t topMem, int isFree)
     return 0;
 }
 
+void memGetStat(uint *free, uint *used)
+{
+    uint idx;
+    struct memDesc *mem;
+    list_foreach(freePage, mem, idx)
+    {
+        continue;
+    }
+    *free = idx;
+    list_foreach(usedPage, mem, idx)
+    {
+        continue;
+    }
+    *used = idx;
+}
+
 struct memDesc *addr2memDesc(paddr_t addr)
 {
     int idx = addr >> PAGE_SHIFT;

core/mem.h

@@ -21,3 +21,4 @@ paddr_t allocPhyPage(uint nbPage);
 int unrefPhyPage(paddr_t addr);
 int refPhyPage(paddr_t addr);
 unsigned long getNbAllocatedPage(void);
+void memGetStat(uint *free, uint *used);

tests/test.c

@@ -21,12 +21,21 @@ void testPhymem(void)
     int allocCount = 0;
     int freeCount  = 0;
 
+    uint freePageStatBegin, usedPageStatBegin;
+    uint freePageStatAlloc, usedPageStatAlloc;
+    uint freePageStatFree, usedPageStatFree;
+
+    memGetStat(&freePageStatBegin, &usedPageStatBegin);
+
     while ((page = (struct memDesc *)allocPhyPage(1)) != NULL) {
         page->phy_addr = allocCount;
         allocCount++;
         list_add_tail(allocated_page_list, page);
     }
     printf("%d pages allocated\n", allocCount);
+    memGetStat(&freePageStatAlloc, &usedPageStatAlloc);
+    assert(freePageStatAlloc == 0);
+    assert((usedPageStatAlloc - usedPageStatBegin) == (uint)allocCount);
 
     while ((page = list_pop_head(allocated_page_list)) != NULL) {
         assertmsg(page->phy_addr == (ulong)freeCount, "page %d modified", page);
@@ -34,6 +43,9 @@ void testPhymem(void)
         freeCount++;
     }
     printf("%d pages freed\n", freeCount);
+    memGetStat(&freePageStatFree, &usedPageStatFree);
+    assert(freePageStatFree == freePageStatBegin);
+    assert(usedPageStatFree == usedPageStatBegin);
 
     assertmsg((page = (struct memDesc *)allocPhyPage(1)) != NULL, "Cannot allocate memory\n");
     unrefPhyPage((ulong)page);