memory.c

国内一位牛人自己开发的操作系统

#include"../include/os.h"

static int hash_function(int file_window,int logic_block)
{
	int i,j;

	i=(*(memory_body->file_number));
	i=i*file_window;
	i=i+logic_block;
	j=(*(memory_body->hash_number));
	return (i%j);
}

void  init_memory(void )
{
	int block_number,block_base;
	REG r;
	union memory_call_parameter *par;

	par=get_memory_parameter();

	r.ax=20; r.bx=0; call_kernel(&r);
	block_number=r.ax; block_base=r.bx;

print("\n              free memory block is ",block_number);
print("os used ",(block_base&(0x0fffffff))/PAGE_SIZE);
	

	RESET_CAPABILITY(par->setup.capability);
	RESET_CAPABILITY(par->setup.memory_body_parameter.capability);

	par->setup.memory_body_parameter.base=(char *)block_base;
	par->setup.memory_body_parameter.hash_function=hash_function;
	par->setup.memory_body_parameter.my_processor=0;
	par->setup.memory_body_parameter.my_memory_body=0;

	par->setup.memory_body_parameter.block_number=block_number;
	par->setup.memory_body_parameter.file_number=48;
	par->setup.memory_body_parameter.process_number=16;
	par->setup.memory_body_parameter.hash_number
		=par->setup.memory_body_parameter.block_number;
	RESET_CAPABILITY(par->setup.capability);
	RESET_CAPABILITY(par->setup.memory_body_parameter.capability);

	r.ax=0;r.bx=8;
	call_memory(&r);
print("\n              need manage area : is ",r.ax);

	r.ax=((r.ax+PAGE_SIZE)/PAGE_SIZE);
	block_number=block_number-r.ax;

	par->setup.memory_body_parameter.block_number=block_number;
	par->setup.memory_body_parameter.first_block=r.ax;
print("\n              first block at ",r.ax);

	RESET_CAPABILITY(par->setup.capability);
	RESET_CAPABILITY(par->setup.memory_body_parameter.capability);

	r.ax=0;r.bx=9;call_memory(&r);

print("\n              actural management area size is:",r.ax);
print("\n              actural memory pages is :",
		par->setup.memory_body_parameter.block_number); 


	par->memory_resource.process_number=0;
	RESET_CAPABILITY(par->memory_resource.capability);
	r.ax=0;r.bx=0x06;call_memory(&r);

print("\n              query memory process' memory resource:",r.ax);

	par->memory_resource.process_number=0;
	par->memory_resource.max_file_number=48;
	par->memory_resource.max_block_number=block_number-500;
	par->memory_resource.trigger_block_number=block_number-5000;
	RESET_CAPABILITY(par->memory_resource.capability);
	r.ax=0; r.bx=0x07; call_memory(&r);

print("\n              allocate memory process' memory resource:",r.ax);

}