matos/core/main.c

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C
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#include "alloc.h"
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#include "exception.h"
#include "gdt.h"
#include "idt.h"
#include "interrupt.h"
#include "io.h"
#include "irq.h"
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#include "klibc.h"
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#include "kthread.h"
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#include "mem.h"
#include "multiboot.h"
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#include "paging.h"
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#include "pit.h"
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#include "serial.h"
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#include "stack.h"
#include "stdarg.h"
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#ifdef RUN_TEST
#include "test.h"
#endif
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#include "time.h"
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#include "types.h"
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#include "vga.h"
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#define CHECK_FLAG(flags, bit) ((flags) & (1 << (bit)))
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void idleThread(void *arg)
{
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(void)arg;
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while (1) {
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VGAPrintf(GREEN, BLACK, 0, VGA_HEIGHT - 1, "%d", (jiffies / HZ));
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kthreadYield();
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}
}
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// Multiboot information available here :
// https://www.gnu.org/software/grub/manual/multiboot/multiboot.html#kernel_002ec
// https://www.gnu.org/software/grub/manual/multiboot/html_node/Boot-information-format.html#Boot%20information%20format
void kmain(unsigned long magic, unsigned long addr)
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{
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unsigned long upperMemKB = 0;
int memMapAvailable = 0;
paddr_t lastUsedByMem;
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paddr_t firstUsedByMem;
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VGASetup(BLACK, GREEN);
printf("Setting up Interruptions\n");
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gdtSetup();
idtSetup();
irqSetup();
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pitSetup(HZ);
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if (magic == MULTIBOOT_BOOTLOADER_MAGIC) { // Get loaded by Grub with mutliboot version 1
multiboot_info_t *mbi = (multiboot_info_t *)addr;
/* Are mem_* valid? */
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if (CHECK_FLAG(mbi->flags, 0)) {
printf("mem_lower = %dKiB mem_upper %dKiB\n", mbi->mem_lower, mbi->mem_upper);
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upperMemKB = mbi->mem_upper;
}
/* Is boot_device valid? */
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if (CHECK_FLAG(mbi->flags, 1)) {
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printf("boot_device = %d\n", mbi->boot_device);
}
/* Is the command line passed? */
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if (CHECK_FLAG(mbi->flags, 2)) {
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printf("cmdline = %s\n", (char *)mbi->cmdline);
}
if (CHECK_FLAG(mbi->flags, 3)) {
multiboot_module_t *mod;
uint32_t i;
printf("mods_count = %d, mods_addr = 0x%x\n", (int)mbi->mods_count,
(int)mbi->mods_addr);
for (i = 0, mod = (multiboot_module_t *)mbi->mods_addr; i < mbi->mods_count;
i++, mod++)
printf(" mod_start = 0x%x, mod_end = 0x%x, cmdline = %s\n",
(unsigned)mod->mod_start, (unsigned)mod->mod_end, (char *)mod->cmdline);
}
if (CHECK_FLAG(mbi->flags, 6)) {
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memMapAvailable = 1;
}
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printf("Framebuffer from 0x%llx size (%dx%d) pitch %d bpp %d\n", mbi->framebuffer_addr, mbi->framebuffer_width, mbi->framebuffer_height, mbi->framebuffer_pitch, mbi->framebuffer_bpp);
}
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if (upperMemKB == 0) {
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printf("Cannot get upper phy mem bound. Using default value 32MB\n");
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upperMemKB = 32 * 1024;
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}
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printf("Setting up Mem\n");
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memSetup(upperMemKB, &firstUsedByMem, &lastUsedByMem);
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if (memMapAvailable) {
multiboot_info_t *mbi = (multiboot_info_t *)addr;
struct multiboot_mmap_entry *mmap = (struct multiboot_mmap_entry *)mbi->mmap_addr;
uint size = mbi->mmap_length / sizeof(struct multiboot_mmap_entry);
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pr_devel("mmap buffer at 0x%x with %d entries\n", mbi->mmap_addr, size);
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for (uint i = 0; i < size; i++) {
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printf(" base_addr 0x%llx, length = 0x%llx, type = 0x%x\n", mmap[i].addr,
mmap[i].len, (uint32_t)mmap[i].type);
// Consider low memory taken (https://wiki.osdev.org/Detecting_Memory_(x86). For
// example by VGA
// Turns out linux and windows do the same !
// https://lore.kernel.org/lkml/MWHPR21MB159330952629D36EEDE706B3D7379@MWHPR21MB1593.namprd21.prod.outlook.com/
if (mmap[i].addr < 0x100000) {
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continue;
}
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memAddBank(max(mmap[i].addr, (multiboot_uint64_t)lastUsedByMem),
mmap[i].addr + mmap[i].len, mmap[i].type == MULTIBOOT_MEMORY_AVAILABLE);
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}
} else {
printf("Cannot get memory Mapping information, using default value\n");
memAddBank(lastUsedByMem, upperMemKB * 1024, 1);
}
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printf("%d pages taken by kernel(0x%x->0x%x))\n", (lastUsedByMem - firstUsedByMem)/PAGE_SIZE, firstUsedByMem, lastUsedByMem);
printf("with %d pages taken for memory management\n", (lastUsedByMem - (paddr_t)&__ld_kernel_end)/PAGE_SIZE);
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#ifdef RUN_TEST
testPhymem();
#endif
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printf("Setting up Pagination\n");
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pagingSetup(firstUsedByMem, lastUsedByMem);
for (paddr_t i = VGA_ADDR; i < VGA_ADDR + VGA_WIDTH * VGA_HEIGHT * sizeof(short) ; i += PAGE_SIZE) {
pageMap(i, i, PAGING_MEM_WRITE);
}
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printf("Setting up IRQ handlers\n");
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irqSetRoutine(IRQ_KEYBOARD, keyboard_handler);
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printf("Enabling HW interrupts\n");
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// Enabling the HW interrupts
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exceptionSetup();
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asm volatile("sti\n");
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printf("Setting up Serial link (115200)\n");
serialSetup(115200);
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printf("Setting up allocation system\n");
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allocSetup();
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printf("Setting up thread system\n");
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kthreadSetup(_stack_bottom, (_stack_top - _stack_bottom + 1));
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kthreadCreate("idle ", idleThread, NULL);
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irqSetRoutine(IRQ_TIMER, pit_handler);
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#ifdef RUN_TEST
run_test();
#endif
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printf("\nSystem init done: ");
{
uint free, used;
memGetStat(&free, &used);
printf("%dKB free %dKB Used\n", free * (PAGE_SIZE / 1024), used * (PAGE_SIZE / 1024));
}
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// There is no real caller behind this point
// So finish this by ourself
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kthreadExit();
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}