mango/arch/x86_64/init.c

#include "arch/serial.h"

#include <arch/e820.h>
#include <arch/pit.h>
#include <socks/arg.h>
#include <socks/clock.h>
#include <socks/console.h>
#include <socks/cpu.h>
#include <socks/init.h>
#include <socks/libc/stdio.h>
#include <socks/machine/cpu.h>
#include <socks/memblock.h>
#include <socks/object.h>
#include <socks/percpu.h>
#include <socks/pmap.h>
#include <socks/printk.h>
#include <socks/types.h>
#include <socks/vm.h>

#define PTR32(x) ((void *)((uintptr_t)(x)))

static ml_cpu_block g_bootstrap_cpu = {0};

/* start and end of kernel image (physical addresses) */
extern char __pstart[], __pend[];

static void bootstrap_cpu_init(void)
{
	ml_cpu_block_init(&g_bootstrap_cpu);
	ml_cpu_block_use(&g_bootstrap_cpu);
}

static void early_vm_init(void)
{
	uintptr_t alloc_start = VM_KERNEL_VOFFSET;
	/* boot code mapped 2 GiB of memory from
	   VM_KERNEL_VOFFSET */
	uintptr_t alloc_end = VM_KERNEL_VOFFSET + 0x7fffffff;

	memblock_init(alloc_start, alloc_end, VM_KERNEL_VOFFSET);
	printk("memblock: allocating from [0x%llx-0x%llx]",
	       alloc_start,
	       alloc_end);

	memblock_reserve(0x00, (uintptr_t)__pend);
	printk("memblock: reserved bios+kernel at [0x%016llx-0x%016llx]",
	       0,
	       (uintptr_t)__pend);
}

void early_console_init(void)
{
	const char *dest = arg_value("kernel.early-console");
	if (!dest) {
		dest = "ttyS0";
	}

	if (!strcmp(dest, "tty0")) {
		/* show log messages on VGA */
	} else if (!strcmp(dest, "ttyS0")) {
		/* write log messages to serial port */
		early_serialcon_init(115200);
	}
}

static void use_uniprocessor_topology(void)
{
	cpu_set_available(0);
	cpu_set_online(0);
}

int ml_init(uintptr_t arg)
{
	multiboot_info_t *mb = (multiboot_info_t *)arg;

	parse_cmdline(PTR32(mb->cmdline));

	early_console_init();

	bootstrap_cpu_init();
	clock_calibrate(500);

	print_kernel_banner();

	early_vm_init();

	e820_scan(PTR32(mb->mmap_addr), mb->mmap_length);

	pmap_bootstrap();

	use_uniprocessor_topology();

	init_per_cpu_areas();

	struct cpu_data *this_cpu = get_this_cpu();
	memset(this_cpu, 0x0, sizeof *this_cpu);

	this_cpu->c_flags = CPU_ONLINE;
	this_cpu->c_id = this_cpu();
	g_bootstrap_cpu.c_data = this_cpu;
	put_cpu(this_cpu);

	struct vm_zone_descriptor vm_zones[] = {
		{.zd_id = VM_ZONE_DMA,
	         .zd_node = 0,
	         .zd_name = "dma",
	         .zd_base = 0x00,
	         .zd_limit = 0xffffff},
		{.zd_id = VM_ZONE_NORMAL,
	         .zd_node = 0,
	         .zd_name = "normal",
	         .zd_base = 0x1000000,
	         .zd_limit = UINTPTR_MAX},
	};

	vm_bootstrap(vm_zones, sizeof vm_zones / sizeof vm_zones[0]);

	object_bootstrap();

	sched_init();

	pit_start(500);
	ml_int_enable();

	return 0;
}