void start(uint32_t* modulep, void* physbase, void* physfree)
{
int i;
struct smap_t {
uint64_t base, length;
uint32_t type;
}__attribute__((packed)) *smap;
// initially Mark all pages used
mm_set(freePage,MEM_SIZE);
while(modulep[0] != 0x9001) modulep += modulep[1]+2;
for(smap = (struct smap_t*)(modulep+2); smap < (struct smap_t*)((char*)modulep+modulep[1]+2*4); ++smap) {
if (smap->type == 1 /* memory */ && smap->length != 0) {
// Mark the memory available in the free list
pmmngr_init_region(smap->base, smap->length);
}
}
/* we need to mark the kernel memory as used kernel starts from 200000 and end at 220000 */
/* so we will mark the memory till 400000 as used however we can keep it till 220000 as well */
pmmngr_uninit_region((uint64_t)0,(uint64_t)0x400000); // mark all kernel memory as used
/* we need to map the kernel memory to the page table */
// initialize the page table
set_page_table(&Page_Table);
uint64_t *addr = (uint64_t*)physbase;
/* we need to map the kernel memory to the page table */
for(addr = (uint64_t*)physbase; addr<=(uint64_t*)physfree; addr++)
{
vmmngr_map_page(addr,(uint64_t *)((uint64_t)addr + KERNEL_VIRTUAL_BASE),&Page_Table);
}
/* Map the Video memory This will map to single page 80*25*2 < 1 page */
vmmngr_map_page((uint64_t *)0xb8000,(uint64_t*)VIDEO_VIRTUAL_MEMORY,&Page_Table);
// printf("Video Memory has been marked in virtual address space\n");
/* pass the pml4e value to cr3 register */
kernel_pml4e = (uint64_t *)ALIGN_DOWN((uint64_t)Page_Table.root);
write_cr3(&Page_Table);
init_video();
/********************************* KERNEL CREATION ********************************/
struct task_struct *pcb0 = (struct task_struct *)kmalloc(sizeof(struct task_struct)); //kernel
pcb0->pml4e =(uint64_t)kernel_pml4e; // kernel's page table
pcb0->pid = 0; // I'm kernel init process so pid 0
pcb0->iswait = 0; //not waiting for any one
pcb0->stack =(uint64_t *)stack; //my stack is already created by prof :)
process_count = 0; //at this point we don't have any other process in ready_queue so go ahead and create one and update this
sleeping_process_count = 0; // at this point no body is sleeping
// initialize processes queue
for(i=0;i<100;i++) {
zombie_queue[i] = 0; // no process is zombie
}
foreground_process = 3; // process with this pid will be foreground process
// put them in the ready queue
ready_queue[0] =(uint64_t ) pcb0; //kernel
/*
char fname[] = "bin/hello";
malloc_pcb(fname);
char fname1[] = "bin/world";
malloc_pcb(fname1);
char fname2[] = "bin/proc3";
malloc_pcb(fname2);
char fname3[] = "bin/proc4";
malloc_pcb(fname3);
*/
/*************************************** Please change here fname ******************/
char fname4[] = "bin/printf";
malloc_pcb(fname4);
idt_install();
__asm__("sti");
//init_context_switch();
asm volatile("mov $0x2b,%ax");
asm volatile("ltr %ax");
tarfs_init();
while(1);
}
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;
}
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(;;) {
}
};
