+++ /dev/null
- /*
- * Physical memory allocation
- * Copyright (c) 2001,2003,2004 David H. Hovemeyer <daveho@cs.umd.edu>
- * Copyright (c) 2003, Jeffrey K. Hollingsworth <hollings@cs.umd.edu>
- * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
- * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
- * $Revision: 1.13 $
- *
- * This is free software. You are permitted to use,
- * redistribute, and modify it as specified in the file "COPYING".
- */
-
-#include <geekos/defs.h>
-#include <geekos/ktypes.h>
-#include <geekos/kassert.h>
-#include <geekos/bootinfo.h>
-#include <geekos/gdt.h>
-#include <geekos/screen.h>
-#include <geekos/int.h>
-#include <geekos/malloc.h>
-#include <geekos/string.h>
-#include <geekos/mem.h>
-
-#include <geekos/serial.h>
-#include <geekos/debug.h>
-
-
-/* ----------------------------------------------------------------------
- * Global data
- * ---------------------------------------------------------------------- */
-
-/*
- * List of Page structures representing each page of physical memory.
- */
-struct Page* g_pageList;
-
-ulong_t g_ramdiskImage;
-ulong_t s_ramdiskSize;
-
-
-/*
- * Number of pages currently available on the freelist.
- */
-uint_t g_freePageCount = 0;
-
-
-
-/*
- * the disgusting way to get at the memory assigned to a VM
- */
-extern ulong_t vm_range_start;
-extern ulong_t vm_range_end;
-extern ulong_t guest_kernel_start;
-extern ulong_t guest_kernel_end;
-
-
-
-/* ----------------------------------------------------------------------
- * Private data and functions
- * ---------------------------------------------------------------------- */
-
-/*
- * Defined in paging.c
- */
-extern int debugFaults;
-#define Debug(args...) if (debugFaults) Print(args)
-
-/*
- * List of pages available for allocation.
- */
-static struct Page_List s_freeList;
-
-/*
- * Total number of physical pages.
- */
-int unsigned s_numPages;
-
-
-
-
-/*
- * Add a range of pages to the inventory of physical memory.
- */
-static void Add_Page_Range(ulong_t start, ulong_t end, int flags)
-{
- ulong_t addr;
-
- PrintBoth("Start: %u (0x%x), End: %u(0x%x) (Type=0x%.4x)\n", (unsigned int)start, start, (unsigned int)end, end, flags);
-
- KASSERT(Is_Page_Multiple(start));
- KASSERT(Is_Page_Multiple(end));
- KASSERT(start < end);
-
- //Print("Adding %lu pages\n", (end - start) / PAGE_SIZE);
-
- for (addr = start; addr < end; addr += PAGE_SIZE) {
- // Print("Adding Page at %u\n", (unsigned int)addr);
- struct Page *page = Get_Page(addr);
-
- page->flags = flags;
-
- if (flags == PAGE_AVAIL) {
- /* Add the page to the freelist */
- Add_To_Back_Of_Page_List(&s_freeList, page);
-
- /* Update free page count */
- ++g_freePageCount;
- } else {
- Set_Next_In_Page_List(page, 0);
- Set_Prev_In_Page_List(page, 0);
- }
-
- }
- // Print("%d pages now in freelist\n", g_freePageCount);
-
-}
-
-/* ----------------------------------------------------------------------
- * Public functions
- * ---------------------------------------------------------------------- */
-
-/*
- * The linker defines this symbol to indicate the end of
- * the executable image.
- */
-extern char end;
-
-/*
- * Initialize memory management data structures.
- * Enables the use of Alloc_Page() and Free_Page() functions.
- */
-void Init_Mem(struct Boot_Info* bootInfo)
-{
- ulong_t numPages = bootInfo->memSizeKB >> 2;
- ulong_t endOfMem = numPages * PAGE_SIZE;
- unsigned numPageListBytes = sizeof(struct Page) * numPages;
- ulong_t pageListAddr;
- ulong_t pageListEnd;
- ulong_t kernEnd;
- ulong_t heapAddr;
- ulong_t heapEnd;
- ulong_t vmmMemEnd;
-
-
- g_ramdiskImage = bootInfo->ramdisk_image;
- s_ramdiskSize = bootInfo->ramdisk_size;
- ulong_t initrdAddr;
- ulong_t initrdEnd;
-
-
-
- KASSERT(bootInfo->memSizeKB > 0);
-
-
- /*
- * Before we do anything, switch from setup.asm's temporary GDT
- * to the kernel's permanent GDT.
- */
- Init_GDT();
-
-
- PrintBoth("Total Memory Size: %u MBytes\n", bootInfo->memSizeKB/1024);
- PrintBoth("Page List (at 0x%x) Size: %u bytes\n", &s_freeList, numPageListBytes);
-
-
- /* Memory Layout:
- * bios area (1 page reserved)
- * kernel_thread_obj (1 page)
- * kernel_stack (1 page)
- * available space
- * available space
- * ISA_HOLE_START - ISA_HOLE_END: hardware
- * EXTENDED_MEMORY:
- * start - end: kernel
- * VM Guest (variable pages)
- * Heap (512 Pages)
- * Page List (variable pages)
- * Available Memory for VMM (4096 pages)
- * Ramdisk //Zheng 08/03/2008
- * VM Memory (everything else)
- */
-
- //kernEnd = Round_Up_To_Page((ulong_t)&end);
- kernEnd = (ulong_t)&end;
-
- PrintBoth("Kernel End=%lx\n", kernEnd);
-
-
- /* ************************************************************************************** */
- /* If we have dynamic loading of the guest kernel, we should put the relocation code here */
- /* ************************************************************************************** */
-
- kernEnd = Round_Up_To_Page(kernEnd);
- heapAddr = kernEnd;
- heapEnd = Round_Up_To_Page(heapAddr + KERNEL_HEAP_SIZE);
- pageListAddr = heapEnd;
- pageListEnd = Round_Up_To_Page(pageListAddr + numPageListBytes);
- /* Global variables */
- // These must be set before we can call Add_Page_Range..
- g_pageList = (struct Page*) pageListAddr;
- s_numPages = numPages;
- /* ** */
- vmmMemEnd = Round_Up_To_Page(pageListEnd + VMM_AVAIL_MEM_SIZE);
-
- /*
- * Zheng 08/03/2008
- * copy the ramdisk to this area
- */
-
- initrdAddr = vmmMemEnd;
- initrdEnd = Round_Up_To_Page(initrdAddr + s_ramdiskSize);
- PrintBoth("mem.c(%d) Move ramdisk(%dB) from %x to %x", __LINE__, s_ramdiskSize, g_ramdiskImage, initrdAddr);
- memcpy((ulong_t *)initrdAddr, (ulong_t *)g_ramdiskImage, s_ramdiskSize);
- PrintBoth(" done\n");
- PrintBoth("mem.c(%d) Set 0 to unused bytes in the last ramdisk page from %x to %x", __LINE__, initrdAddr+s_ramdiskSize, initrdEnd);
- memset((ulong_t *)initrdAddr + s_ramdiskSize, 0, initrdEnd - (initrdAddr + s_ramdiskSize));
- PrintBoth(" done\n");
-
-
-
- /*
- * the disgusting way to get at the memory assigned to a VM
- */
-
- //vm_range_start = vmmMemEnd;
- //vm_range_end = endOfMem;
- /*
- * Zheng 08/03/2008
- */
- vm_range_start = initrdEnd;
- vm_range_end = endOfMem;
-
-
- Add_Page_Range(0, PAGE_SIZE, PAGE_UNUSED); // BIOS area
- Add_Page_Range(PAGE_SIZE, PAGE_SIZE * 3, PAGE_ALLOCATED); // Intial kernel thread obj + stack
- Add_Page_Range(PAGE_SIZE * 3, ISA_HOLE_START, PAGE_AVAIL); // Available space
- Add_Page_Range(ISA_HOLE_START, ISA_HOLE_END, PAGE_HW); // Hardware ROMs
- Add_Page_Range(KERNEL_START_ADDR, kernEnd, PAGE_KERN); // VMM Kernel
- // Add_Page_Range(guest_kernel_start, guestEnd, PAGE_VM); // Guest kernel location
- Add_Page_Range(heapAddr, heapEnd, PAGE_HEAP); // Heap
- Add_Page_Range(pageListAddr, pageListEnd, PAGE_KERN); // Page List
- Add_Page_Range(pageListEnd, vmmMemEnd, PAGE_AVAIL); // Available VMM memory
-
-#ifdef RAMDISK_BOOT
- /*
- * Zheng 08/03/2008
- */
- Add_Page_Range(vmmMemEnd, initrdEnd, PAGE_ALLOCATED); //Ramdisk memory area
- // Add_Page_Range(vmmMemEnd, endOfMem, PAGE_VM); // Memory allocated to the VM
- // Until we get a more intelligent memory allocator
- Add_Page_Range(initrdEnd, endOfMem, PAGE_AVAIL); // Memory allocated to the VM
-#else
- Add_Page_Range(vmmMemEnd, endOfMem, PAGE_AVAIL); // Memory allocated to the VM
-#endif
-
- /* Initialize the kernel heap */
- Init_Heap(heapAddr, KERNEL_HEAP_SIZE);
-
- PrintBoth("%uKB memory detected, %u pages in freelist, %d bytes in kernel heap\n",
- bootInfo->memSizeKB, g_freePageCount, KERNEL_HEAP_SIZE);
-
- PrintBoth("Memory Layout:\n");
- PrintBoth("%x to %x - BIOS AREA\n", 0, PAGE_SIZE - 1);
- PrintBoth("%x to %x - KERNEL_THREAD_OBJ\n", PAGE_SIZE, PAGE_SIZE * 2 - 1);
- PrintBoth("%x to %x - KERNEL_STACK\n", PAGE_SIZE * 2, PAGE_SIZE * 3 - 1);
- PrintBoth("%lx to %x - FREE\n", PAGE_SIZE * 3, ISA_HOLE_START - 1);
- PrintBoth("%x to %x - ISA_HOLE\n", ISA_HOLE_START, ISA_HOLE_END - 1);
- PrintBoth("%x to %x - KERNEL CODE + VM_KERNEL\n", KERNEL_START_ADDR, kernEnd - 1);
- // PrintBoth("%x to %x - VM_KERNEL\n", kernEnd, guestEnd - 1);
- PrintBoth("%x to %x - KERNEL HEAP\n", heapAddr, heapEnd - 1);
- PrintBoth("%lx to %lx - PAGE LIST\n", pageListAddr, pageListEnd - 1);
- PrintBoth("%lx to %x - FREE\n", pageListEnd, vmmMemEnd - 1);
-
-#ifdef RAMDISK_BOOT
- /*
- * Zheng 08/03/2008
- */
- PrintBoth("%lx to %x - RAMDISK\n", vmmMemEnd, initrdEnd - 1);
-
- PrintBoth("%lx to %x - GUEST_MEMORY (also free)\n", initrdEnd, endOfMem - 1);
-#else
- PrintBoth("%lx to %x - GUEST_MEMORY (also free)\n", vmmMemEnd, endOfMem - 1);
-#endif
-}
-
-/*
- * Initialize the .bss section of the kernel executable image.
- */
-void Init_BSS(void)
-{
- extern char BSS_START, BSS_END;
-
- /* Fill .bss with zeroes */
- memset(&BSS_START, '\0', &BSS_END - &BSS_START);
- // screen is not inited yet - PAD
- // PrintBoth("BSS Inited, BSS_START=%x, BSS_END=%x\n",BSS_START,BSS_END);
-}
-
-/*
- * Allocate a page of physical memory.
- */
-void* Alloc_Page(void)
-{
- struct Page* page;
- void *result = 0;
-
- bool iflag = Begin_Int_Atomic();
-
- /* See if we have a free page */
- if (!Is_Page_List_Empty(&s_freeList)) {
- /* Remove the first page on the freelist. */
- page = Get_Front_Of_Page_List(&s_freeList);
- KASSERT((page->flags & PAGE_ALLOCATED) == 0);
- Remove_From_Front_Of_Page_List(&s_freeList);
-
- /* Mark page as having been allocated. */
- page->flags |= PAGE_ALLOCATED;
- g_freePageCount--;
- result = (void*) Get_Page_Address(page);
- }
-
- End_Int_Atomic(iflag);
-
- return result;
-}
-
-/*
- * Free a page of physical memory.
- */
-void Free_Page(void* pageAddr)
-{
- ulong_t addr = (ulong_t) pageAddr;
- struct Page* page;
- bool iflag;
-
- iflag = Begin_Int_Atomic();
-
- KASSERT(Is_Page_Multiple(addr));
-
- /* Get the Page object for this page */
- page = Get_Page(addr);
- KASSERT((page->flags & PAGE_ALLOCATED) != 0);
-
- /* Clear the allocation bit */
- page->flags &= ~(PAGE_ALLOCATED);
-
- /* Put the page back on the freelist */
- Add_To_Back_Of_Page_List(&s_freeList, page);
- g_freePageCount++;
-
- End_Int_Atomic(iflag);
-}