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#include <multiboot.h>
#include <config.h>
#include <dbglog.h>
#include <sys.h>
#include <gdt.h>
#include <idt.h>
#include <frame.h>
#include <paging.h>
#include <region.h>
#include <kmalloc.h>
#include <thread.h>
#include <slab_alloc.h>
extern const void k_end_addr; // defined in linker script : 0xC0000000 plus kernel stuff
void breakpoint_handler(registers_t *regs) {
dbg_printf("Breakpoint! (int3)\n");
BOCHS_BREAKPOINT;
}
void region_test1() {
void* p = region_alloc(0x1000, "Test region", 0);
dbg_printf("Allocated one-page region: 0x%p\n", p);
dbg_print_region_info();
void* q = region_alloc(0x1000, "Test region", 0);
dbg_printf("Allocated one-page region: 0x%p\n", q);
dbg_print_region_info();
void* r = region_alloc(0x2000, "Test region", 0);
dbg_printf("Allocated two-page region: 0x%p\n", r);
dbg_print_region_info();
void* s = region_alloc(0x10000, "Test region", 0);
dbg_printf("Allocated 16-page region: 0x%p\n", s);
dbg_print_region_info();
region_free(p);
dbg_printf("Freed region 0x%p\n", p);
dbg_print_region_info();
region_free(q);
dbg_printf("Freed region 0x%p\n", q);
dbg_print_region_info();
region_free(r);
dbg_printf("Freed region 0x%p\n", r);
dbg_print_region_info();
region_free(s);
dbg_printf("Freed region 0x%p\n", s);
dbg_print_region_info();
}
void region_test2() {
// allocate a big region and try to write into it
dbg_printf("Begin region test 2...");
const size_t n = 200;
void* p0 = region_alloc(n * PAGE_SIZE, "Test big region", default_allocator_pf_handler);
for (size_t i = 0; i < n; i++) {
uint32_t *x = (uint32_t*)(p0 + i * PAGE_SIZE);
x[0] = 12;
x[1] = (i * 20422) % 122;
}
// unmap memory
for (size_t i = 0; i < n; i++) {
void* p = p0 + i * PAGE_SIZE;
uint32_t *x = (uint32_t*)p;
ASSERT(x[1] == (i * 20422) % 122);
uint32_t f = pd_get_frame(p);
ASSERT(f != 0);
pd_unmap_page(p);
ASSERT(pd_get_frame(p) == 0);
frame_free(f, 1);
}
region_free(p0);
dbg_printf("OK\n");
}
void kmalloc_test(void* kernel_data_end) {
// Test kmalloc !
dbg_print_region_info();
dbg_printf("Begin kmalloc test...\n");
const int m = 200;
uint16_t** ptr = kmalloc(m * sizeof(uint32_t));
for (int i = 0; i < m; i++) {
size_t s = 1 << ((i * 7) % 11 + 2);
ptr[i] = (uint16_t*)kmalloc(s);
ASSERT((void*)ptr[i] >= kernel_data_end && (size_t)ptr[i] < 0xFFC00000);
*ptr[i] = ((i * 211) % 1024);
}
dbg_printf("Fully allocated.\n");
dbg_print_region_info();
for (int i = 0; i < m; i++) {
for (int j = i; j < m; j++) {
ASSERT(*ptr[j] == (j * 211) % 1024);
}
kfree(ptr[i]);
}
kfree(ptr);
dbg_printf("Kmalloc test OK.\n");
dbg_print_region_info();
}
void test_thread(void* a) {
int i = 0;
while(1) {
dbg_printf("b");
for (int x = 0; x < 100000; x++) asm volatile("xor %%ebx, %%ebx":::"%ebx");
if (++i == 8) {
yield();
i = 0;
}
}
}
void kernel_init_stage2(void* data) {
thread_t *tb = new_thread(test_thread);
resume_thread_with_result(tb, 0, false);
dbg_print_region_info();
dbg_print_frame_stats();
while(1) {
dbg_printf("a");
for (int x = 0; x < 100000; x++) asm volatile("xor %%ebx, %%ebx":::"%ebx");
}
PANIC("Reached kmain end! Falling off the edge.");
}
void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) {
dbglog_setup();
dbg_printf("Hello, kernel world!\n");
dbg_printf("This is %s, version %s.\n", OS_NAME, OS_VERSION);
ASSERT(mb_magic == MULTIBOOT_BOOTLOADER_MAGIC);
gdt_init(); dbg_printf("GDT set up.\n");
idt_init(); dbg_printf("IDT set up.\n");
idt_set_ex_handler(EX_BREAKPOINT, breakpoint_handler);
asm volatile("int $0x3"); // test breakpoint
size_t total_ram = ((mbd->mem_upper + mbd->mem_lower) * 1024);
dbg_printf("Total ram: %d Kb\n", total_ram / 1024);
// used for allocation of data structures before malloc is set up
// a pointer to this pointer is passed to the functions that might have
// to allocate memory ; they just increment it of the allocated quantity
void* kernel_data_end = (void*)&k_end_addr;
frame_init_allocator(total_ram, &kernel_data_end);
dbg_printf("kernel_data_end: 0x%p\n", kernel_data_end);
dbg_print_frame_stats();
paging_setup(kernel_data_end);
dbg_printf("Paging seems to be working!\n");
BOCHS_BREAKPOINT;
region_allocator_init(kernel_data_end);
region_test1();
region_test2();
kmalloc_setup();
kmalloc_test(kernel_data_end);
// enter multi-threading mode
// interrupts are enabled at this moment, so all
// code run from now on should be preemtible (ie thread-safe)
threading_setup(kernel_init_stage2, 0);
PANIC("Should never come here.");
}
/* vim: set ts=4 sw=4 tw=0 noet :*/
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