133 lines
4.3 KiB
C
Executable file
133 lines
4.3 KiB
C
Executable file
/*
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File: kernel.C
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Author: R. Bettati
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Department of Computer Science
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Texas A&M University
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Date : 02/02/17
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This file has the main entry point to the operating system.
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*/
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/*--------------------------------------------------------------------------*/
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/* DEFINES */
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/*--------------------------------------------------------------------------*/
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#define MB * (0x1 << 20)
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#define KB * (0x1 << 10)
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/* Makes things easy to read */
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#define KERNEL_POOL_START_FRAME ((2 MB) / (4 KB))
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#define KERNEL_POOL_SIZE ((2 MB) / (4 KB))
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#define PROCESS_POOL_START_FRAME ((4 MB) / (4 KB))
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#define PROCESS_POOL_SIZE ((28 MB) / (4 KB))
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/* Definition of the kernel and process memory pools */
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#define MEM_HOLE_START_FRAME ((15 MB) / (4 KB))
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#define MEM_HOLE_SIZE ((1 MB) / (4 KB))
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/* We have a 1 MB hole in physical memory starting at address 15 MB */
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#define TEST_START_ADDR_PROC (4 MB)
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#define TEST_START_ADDR_KERNEL (2 MB)
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/* Used in the memory test below to generate sequences of memory references. */
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/* One is for a sequence of memory references in the kernel space, and the */
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/* other for memory references in the process space. */
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#define N_TEST_ALLOCATIONS
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/* Number of recursive allocations that we use to test. */
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/*--------------------------------------------------------------------------*/
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/* INCLUDES */
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/*--------------------------------------------------------------------------*/
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#include "machine.H" /* LOW-LEVEL STUFF */
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#include "console.H"
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#include "assert.H"
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#include "cont_frame_pool.H" /* The physical memory manager */
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/*--------------------------------------------------------------------------*/
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/* FORWARDS */
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/*--------------------------------------------------------------------------*/
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void test_memory(ContFramePool * _pool, unsigned int _allocs_to_go);
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/*--------------------------------------------------------------------------*/
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/* MAIN ENTRY INTO THE OS */
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/*--------------------------------------------------------------------------*/
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int main() {
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Console::init();
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/* -- INITIALIZE FRAME POOLS -- */
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/* ---- KERNEL POOL -- */
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ContFramePool kernel_mem_pool(KERNEL_POOL_START_FRAME,
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KERNEL_POOL_SIZE,
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0,
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0);
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/* ---- PROCESS POOL -- */
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/*
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unsigned long n_info_frames = ContFramePool::needed_info_frames(PROCESS_POOL_SIZE);
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unsigned long process_mem_pool_info_frame = kernel_mem_pool.get_frames(n_info_frames);
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ContFramePool process_mem_pool(PROCESS_POOL_START_FRAME,
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PROCESS_POOL_SIZE,
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process_mem_pool_info_frame,
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n_info_frames);
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process_mem_pool.mark_inaccessible(MEM_HOLE_START_FRAME, MEM_HOLE_SIZE);
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*/
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/* -- MOST OF WHAT WE NEED IS SETUP. THE KERNEL CAN START. */
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Console::puts("Hello World!\n");
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/* -- TEST MEMORY ALLOCATOR */
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test_memory(&kernel_mem_pool, 32);
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/* ---- Add code here to test the frame pool implementation. */
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/* -- NOW LOOP FOREVER */
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Console::puts("Testing is DONE. We will do nothing forever\n");
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Console::puts("Feel free to turn off the machine now.\n");
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for(;;);
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/* -- WE DO THE FOLLOWING TO KEEP THE COMPILER HAPPY. */
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return 1;
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}
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void test_memory(ContFramePool * _pool, unsigned int _allocs_to_go) {
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Console::puts("alloc_to_go = "); Console::puti(_allocs_to_go); Console::puts("\n");
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if (_allocs_to_go > 0) {
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int n_frames = _allocs_to_go % 4 + 1;
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unsigned long frame = _pool->get_frames(n_frames);
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int * value_array = (int*)(frame * (4 KB));
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for (int i = 0; i < (1 KB) * n_frames; i++) {
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value_array[i] = _allocs_to_go;
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}
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test_memory(_pool, _allocs_to_go - 1);
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for (int i = 0; i < (1 KB) * n_frames; i++) {
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if(value_array[i] != _allocs_to_go){
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Console::puts("MEMORY TEST FAILED. ERROR IN FRAME POOL\n");
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Console::puts("i ="); Console::puti(i);
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Console::puts(" v = "); Console::puti(value_array[i]);
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Console::puts(" n ="); Console::puti(_allocs_to_go);
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Console::puts("\n");
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for(;;);
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}
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}
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ContFramePool::release_frames(frame);
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}
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}
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