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(;;) {
}
};
