void TerminateProcess () {
process* cur = &_proc;
if (cur->id==PROC_INVALID_ID)
return;
/* release threads */
int i=0;
thread* pThread = &cur->threads[i];
/* get physical address of stack */
void* stackFrame = vmmngr_getPhysicalAddress (cur->pageDirectory,
(uint32_t) pThread->initialStack);
/* unmap and release stack memory */
vmmngr_unmapPhysicalAddress (cur->pageDirectory, (uint32_t) pThread->initialStack);
pmmngr_free_block (stackFrame);
/* unmap and release image memory */
for (uint32_t page = 0; page < pThread->imageSize/PAGE_SIZE; page++) {
uint32_t phys = 0;
uint32_t virt = 0;
/* get virtual address of page */
virt = pThread->imageBase + (page * PAGE_SIZE);
/* get physical address of page */
phys = (uint32_t) vmmngr_getPhysicalAddress (cur->pageDirectory, virt);
/* unmap and release page */
vmmngr_unmapPhysicalAddress (cur->pageDirectory, virt);
pmmngr_free_block ((void*)phys);
}
/* restore kernel selectors */
__asm {
cli
mov eax, 0x10
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
sti
}
/* return to kernel command shell */
run ();
DebugPrintf ("\nExit command recieved; demo halted");
for (;;);
}
void vmmngr_free_page(virtual_addr addr)
{
pt_entry * pte;
pte = (pt_entry *) ((uint32_t) vmmngr_get_ptable_address(addr) + PAGE_TABLE_INDEX(addr));
pmmngr_free_block((void *) pt_entry_pfn(*pte));
pt_entry_del_attrib(pte, I86_PTE_PRESENT);
}
error_t vmmngr_pdirectory_clear(pdirectory* pdir)
{
for (int i = 0; i < TABLES_PER_DIR; i++)
{
if (vmmngr_ptable_clear((ptable*)pd_entry_get_frame(pdir->entries[i])) != ERROR_OK)
return ERROR_OCCUR;
}
memset(pdir, 0, sizeof(pdirectory));
pmmngr_free_block(pdir);
return ERROR_OK;
}
error_t vmmngr_ptable_clear(ptable* table)
{
if (!table)
{
set_last_error(EINVAL, VMEM_BAD_ARGUMENT, EO_VMMNGR);
return ERROR_OCCUR;
}
memset(table, 0, sizeof(ptable));
pmmngr_free_block(table);
return ERROR_OK;
}
error_t vmmngr_free_page(pt_entry* entry)
{
if (!entry)
{
set_last_error(EINVAL, VMEM_BAD_ARGUMENT, EO_VMMNGR);
return ERROR_OCCUR;
}
void* addr = (void*)pt_entry_get_frame(*entry);
if (addr)
pmmngr_free_block(addr);
pt_entry_del_attrib(entry, I86_PTE_PRESENT);
pt_entry_del_attrib(entry, I86_PTE_WRITABLE);
return ERROR_OK;
}
int _cdecl kmain (multiboot_info* bootinfo) {
//! get kernel size passed from boot loader
uint32_t kernelSize=0;
_asm mov word ptr [kernelSize], dx
//! make demo look nice :)
DebugClrScr (0x13);
DebugGotoXY (0,0);
DebugSetColor (0x3F);
DebugPrintf (" ~[ Physical Memory Manager Demo ]~ ");
DebugGotoXY (0,24);
DebugSetColor (0x3F);
DebugPrintf (" ");
DebugGotoXY (0,2);
DebugSetColor (0x17);
//! initialize hal
hal_initialize ();
//! enable interrupts and install exception handlers
enable ();
setvect (0,(void (__cdecl &)(void))divide_by_zero_fault);
setvect (1,(void (__cdecl &)(void))single_step_trap);
setvect (2,(void (__cdecl &)(void))nmi_trap);
setvect (3,(void (__cdecl &)(void))breakpoint_trap);
setvect (4,(void (__cdecl &)(void))overflow_trap);
setvect (5,(void (__cdecl &)(void))bounds_check_fault);
setvect (6,(void (__cdecl &)(void))invalid_opcode_fault);
setvect (7,(void (__cdecl &)(void))no_device_fault);
setvect (8,(void (__cdecl &)(void))double_fault_abort);
setvect (10,(void (__cdecl &)(void))invalid_tss_fault);
setvect (11,(void (__cdecl &)(void))no_segment_fault);
setvect (12,(void (__cdecl &)(void))stack_fault);
setvect (13,(void (__cdecl &)(void))general_protection_fault);
setvect (14,(void (__cdecl &)(void))page_fault);
setvect (16,(void (__cdecl &)(void))fpu_fault);
setvect (17,(void (__cdecl &)(void))alignment_check_fault);
setvect (18,(void (__cdecl &)(void))machine_check_abort);
setvect (19,(void (__cdecl &)(void))simd_fpu_fault);
//! get memory size in KB
uint32_t memSize = 1024 + bootinfo->m_memoryLo + bootinfo->m_memoryHi*64;
//! initialize the physical memory manager
//! we place the memory bit map used by the PMM at the end of the kernel in memory
pmmngr_init (memSize, 0x100000 + kernelSize*512);
DebugPrintf("pmm initialized with %i KB physical memory; memLo: %i memHi: %i\n\n",
memSize,bootinfo->m_memoryLo,bootinfo->m_memoryHi);
DebugSetColor (0x19);
DebugPrintf ("Physical Memory Map:\n");
memory_region* region = (memory_region*)0x1000;
for (int i=0; i<15; ++i) {
//! sanity check; if type is > 4 mark it reserved
if (region[i].type>4)
region[i].type=1;
//! if start address is 0, there is no more entries, break out
if (i>0 && region[i].startLo==0)
break;
//! display entry
DebugPrintf ("region %i: start: 0x%x%x length (bytes): 0x%x%x type: %i (%s)\n", i,
region[i].startHi, region[i].startLo,
region[i].sizeHi,region[i].sizeLo,
region[i].type, strMemoryTypes[region[i].type-1]);
//! if region is avilable memory, initialize the region for use
if (region[i].type==1)
pmmngr_init_region (region[i].startLo, region[i].sizeLo);
}
//! deinit the region the kernel is in as its in use
pmmngr_deinit_region (0x100000, kernelSize*512);
DebugSetColor (0x17);
DebugPrintf ("\npmm regions initialized: %i allocation blocks; used or reserved blocks: %i\nfree blocks: %i\n",
pmmngr_get_block_count (), pmmngr_get_use_block_count (), pmmngr_get_free_block_count () );
//! allocating and deallocating memory examples...
DebugSetColor (0x12);
uint32_t* p = (uint32_t*)pmmngr_alloc_block ();
DebugPrintf ("\np allocated at 0x%x", p);
uint32_t* p2 = (uint32_t*)pmmngr_alloc_blocks (2);
DebugPrintf ("\nallocated 2 blocks for p2 at 0x%x", p2);
pmmngr_free_block (p);
p = (uint32_t*)pmmngr_alloc_block ();
DebugPrintf ("\nUnallocated p to free block 1. p is reallocated to 0x%x", p);
pmmngr_free_block (p);
pmmngr_free_blocks (p2, 2);
return 0;
}
void TerminateProcess () {
Process* cur = ProcessManager::GetInstance()->g_pCurProcess;
if (cur->TaskID == PROC_INVALID_ID)
{
DebugPrintf("\nsdffdsdsfsd");
return;
}
/* release threads */
int i=0;
//Thread* pThread = ProcessManager::GetInstance()->g_pThread;
Thread* pThread = (Thread*)List_GetData(cur->pThreadQueue, "", 0);
List_Delete(&cur->pThreadQueue, "", 0);
u32int heapAddess = pThread->imageBase + pThread->imageSize + PAGE_SIZE + PAGE_SIZE * 2;
heapAddess = heapAddess - (heapAddess % PAGE_SIZE);
for (int i = 0; i < 300; i++)
{
uint32_t phys = 0;
uint32_t virt = 0;
/* get virtual address of page */
virt = heapAddess + (i * PAGE_SIZE);
/* get physical address of page */
phys = (uint32_t)vmmngr_getPhysicalAddress(cur->pPageDirectory, virt);
/* unmap and release page */
vmmngr_unmapPhysicalAddress(cur->pPageDirectory, virt);
}
/* unmap and release image memory */
for (uint32_t page = 0; page < cur->dwPageCount; page++) {
uint32_t phys = 0;
uint32_t virt = 0;
/* get virtual address of page */
virt = pThread->imageBase + (page * PAGE_SIZE);
/* get physical address of page */
phys = (uint32_t)vmmngr_getPhysicalAddress(cur->pPageDirectory, virt);
/* unmap and release page */
vmmngr_unmapPhysicalAddress(cur->pPageDirectory, virt);
//pmmngr_free_block ((void*)phys);
}
/* get physical address of stack */
void* stackFrame = vmmngr_getPhysicalAddress(cur->pPageDirectory,
(uint32_t)pThread->initialStack);
/* unmap and release stack memory */
vmmngr_unmapPhysicalAddress(cur->pPageDirectory, (uint32_t)pThread->initialStack);
//pmmngr_free_block(stackFrame);
pmmngr_free_block(cur->pPageDirectory);
delete pThread;
delete cur;
/* restore kernel selectors */
__asm {
cli
mov eax, 0x10
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
sti
}
pmmngr_load_PDBR((physical_addr)vmmngr_get_directory());
/* return to kernel command shell */
run ();
DebugPrintf ("\nExit command recieved; demo halted");
for (;;);
}
void vmmngr_initialize(physical_addr dir_address)
{
int i = 0;
int frame = 0;
int virt = 0;
ptable * table = (ptable *) pmmngr_alloc_block();
if (!table)
{
return;
}
ptable * table2 = (ptable *) pmmngr_alloc_block();
if (!table2)
{
pmmngr_free_block(table);
return;
}
memset(table, 0, sizeof(ptable));
for (i = 0, frame = 0x0, virt = 0x00000000; i < 1024; ++i, frame+=4096, virt+=4096)
{
pt_entry page = 0;
pt_entry_add_attrib(&page, I86_PTE_PRESENT);
pt_entry_set_frame(&page, frame);
table->m_entries[PAGE_TABLE_INDEX(virt)] = page;
}
for (i = 0, frame = 0x0, virt = 0xc0000000; i < 1024; ++i, frame+=4096, virt+=4096)
{
pt_entry page = 0;
pt_entry_add_attrib(&page, I86_PTE_PRESENT);
pt_entry_set_frame(&page, frame);
table2->m_entries[PAGE_TABLE_INDEX(virt)] = page;
}
pdirectory * dir = (pdirectory *) dir_address;// pmmngr_alloc_block();
if (!dir)
{
pmmngr_free_block(table);
pmmngr_free_block(table2);
return;
}
memset(dir, 0, sizeof(pdirectory));
pd_entry * entry = &dir->m_entries[PAGE_DIRECTORY_INDEX(0x00000000)];
pd_entry_add_attrib(entry, I86_PDE_PRESENT);
pd_entry_add_attrib(entry, I86_PDE_WRITABLE);
pd_entry_set_frame(entry, (physical_addr) table);
pd_entry * entry2 = &dir->m_entries[PAGE_DIRECTORY_INDEX(0xc0000000)];
pd_entry_add_attrib(entry2, I86_PDE_PRESENT);
pd_entry_add_attrib(entry2, I86_PDE_WRITABLE);
pd_entry_set_frame(entry2, (physical_addr) table2);
pd_entry * entry3 = &dir->m_entries[PAGE_DIRECTORY_INDEX(0xFFC00000)];
pd_entry_add_attrib(entry3, I86_PDE_PRESENT);
pd_entry_add_attrib(entry3, I86_PDE_WRITABLE);
pd_entry_set_frame(entry3, (physical_addr) dir);
vmmngr_switch_pdirectory(dir);
pmmngr_paging_enable(1);
}
int _k_main(struct multiboot_info *bootinfo)
{
int i;
uint32_t memSize;
struct memory_region* region;
uint32_t *p,*p2;
/*Initialize hardware drivers*/
hw_initialize();
//! install our exception handlers
setvect (0, divide_by_zero_fault);
setvect (1, single_step_trap);
setvect (2, nmi_trap);
setvect (3, breakpoint_trap);
setvect (4, overflow_trap);
setvect (5, bounds_check_fault);
setvect (6, invalid_opcode_fault);
setvect (7, no_device_fault);
setvect (8, double_fault_abort);
setvect (10, invalid_tss_fault);
setvect (11, no_segment_fault);
setvect (12, stack_fault);
setvect (13, general_protection_fault);
setvect (14, page_fault);
setvect (16, fpu_fault);
setvect (17, alignment_check_fault);
setvect (18, machine_check_abort);
setvect (19, simd_fpu_fault);
ClrScr (0x13);
GotoXY (0,0);
SetColor (0x12);
Puts ("\n zygote OS v0.01\n");
SetColor (0x17);
/* Puts ("Enabled A20!\n");
Puts ("Initialized GDT and IDT!\n");
Puts ("Installed PIC, PIT, and exception handlers!\n");
Printf ("Cpu vender: %s \n", get_cpu_vender ());*/
//! get memory size in KB
memSize = 1024 + bootinfo->m_memoryLo + bootinfo->m_memoryHi*64;
//! initialize the physical memory manager
//! we place the memory bit map used by the PMM at the end of the kernel in memory
pmmngr_init (memSize, 0x100000);
Printf("pmm initialized with %i KB physical memory; memLo: %i memHi: %i\n",
memSize,bootinfo->m_memoryLo,bootinfo->m_memoryHi);
SetColor (0x19);
Printf ("Physical Memory Map:\n");
region = (struct memory_region*)0x1000;
for (i=0; i<15; ++i) {
//! sanity check; if type is > 4 mark it reserved
if (region[i].type>4)
region[i].type=1;
//! if start address is 0, there is no more entries, break out
if (i>0 && region[i].startLo==0)
break;
//! display entry
Printf ("region %i: start: 0x%x%x length (bytes): 0x%x%x type: %i (%s)\n", i,
region[i].startHi, region[i].startLo,
region[i].sizeHi,region[i].sizeLo,
region[i].type, strMemoryTypes[region[i].type-1]);
//! if region is avilable memory, initialize the region for use
if (region[i].type==1)
pmmngr_init_region (region[i].startLo, region[i].sizeLo);
}
SetColor (0x17);
Printf ("\npmm regions initialized: %i allocation blocks; used or reserved blocks: %i\nfree blocks: %i\n",
pmmngr_get_block_count (), pmmngr_get_use_block_count (), pmmngr_get_free_block_count () );
//! allocating and deallocating memory examples...
SetColor (0x12);
p = (uint32_t*)pmmngr_alloc_block ();
Printf ("\np allocated at 0x%x", p);
p2 = (uint32_t*)pmmngr_alloc_blocks (2);
Printf ("\nallocated 2 blocks for p2 at 0x%x", p2);
pmmngr_free_block (p);
p = (uint32_t*)pmmngr_alloc_block ();
Printf ("\nUnallocated p to free block 1. p is reallocated to 0x%x", p);
pmmngr_free_block (p);
pmmngr_free_blocks (p2, 2);
//To test divide by zero exception
//i = 10/0;
Puts ("\nHitting any key will fire the default handlers \n");
for(;;) {
}
};