#include <stdio.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <parlib/arch/arch.h>
#include <parlib/ros_debug.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <ros/syscall.h>
#include <sys/mman.h>
#include <vmm/coreboot_tables.h>
#include <vmm/vmm.h>
#include <vmm/acpi/acpi.h>
#include <vmm/acpi/vmm_simple_dsdt.h>
#include <ros/arch/mmu.h>
#include <ros/arch/membar.h>
#include <ros/vmm.h>
#include <parlib/uthread.h>
#include <vmm/linux_bootparam.h>

#include <vmm/virtio.h>
#include <vmm/virtio_mmio.h>
#include <vmm/virtio_ids.h>
#include <vmm/virtio_config.h>
#include <vmm/virtio_console.h>
#include <vmm/virtio_net.h>
#include <vmm/virtio_lguest_console.h>

#include <vmm/sched.h>
#include <sys/eventfd.h>
#include <sys/uio.h>

struct virtual_machine local_vm, *vm = &local_vm;

struct vmm_gpcore_init gpci;

/* By 1999, you could just scan the hardware
 * and work it out. But 2005, that was no longer possible. How sad.
 * so we have to fake acpi to make it all work.
 * This will be copied to memory at 0xe0000, so the kernel can find it.
 */

/* assume they're all 256 bytes long just to make it easy.
 * Just have pointers that point to aligned things.
 */

struct acpi_table_rsdp rsdp = {
	.signature = ACPI_SIG_RSDP,
	.oem_id = "AKAROS",
	.revision = 2,
	.length = 36,
};

struct acpi_table_xsdt xsdt = {
	.header = {
		.signature = ACPI_SIG_DSDT,
		.revision = 2,
		.oem_id = "AKAROS",
		.oem_table_id = "ALPHABET",
		.oem_revision = 0,
		.asl_compiler_id = "RON ",
		.asl_compiler_revision = 0,
	},
};
struct acpi_table_fadt fadt = {
	.header = {
		.signature = ACPI_SIG_FADT,
		.revision = 2,
		.oem_id = "AKAROS",
		.oem_table_id = "ALPHABET",
		.oem_revision = 0,
		.asl_compiler_id = "RON ",
		.asl_compiler_revision = 0,
	},
};


/* This has to be dropped into memory, then the other crap just follows it.
 */
struct acpi_table_madt madt = {
	.header = {
		.signature = ACPI_SIG_MADT,
		.revision = 2,
		.oem_id = "AKAROS",
		.oem_table_id = "ALPHABET",
		.oem_revision = 0,
		.asl_compiler_id = "RON ",
		.asl_compiler_revision = 0,
	},

	.address = 0xfee00000ULL,
	.flags = 0,
};

struct acpi_madt_local_apic Apic0 = {.header = {.type = ACPI_MADT_TYPE_LOCAL_APIC, .length = sizeof(struct acpi_madt_local_apic)},
				     .processor_id = 0, .id = 0, .lapic_flags = 1};
struct acpi_madt_io_apic Apic1 = {.header = {.type = ACPI_MADT_TYPE_IO_APIC, .length = sizeof(struct acpi_madt_io_apic)},
				  .id = 0, .address = 0xfec00000, .global_irq_base = 0};
struct acpi_madt_local_x2apic X2Apic0 = {
	.header = {
		.type = ACPI_MADT_TYPE_LOCAL_X2APIC,
		.length = sizeof(struct acpi_madt_local_x2apic)
	},
	.local_apic_id = 0,
	.uid = 0
};

struct acpi_madt_interrupt_override isor[] = {
	/* From the ACPI Specification Version 6.1:
	 * For example, if your machine has the ISA Programmable Interrupt Timer
	 * (PIT) connected to ISA IRQ 0, but in APIC mode, it is connected to I/O
	 * APIC interrupt input 2, then you would need an Interrupt Source Override
	 * where the source entry is ‘0’ and the Global System Interrupt is ‘2.’
	 */
	{.header = {.type = ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
	            .length = sizeof(struct acpi_madt_interrupt_override)},
	 .bus = 0, .source_irq = 0, .global_irq = 2, .inti_flags = 0},
	{.header = {.type = ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
	            .length = sizeof(struct acpi_madt_interrupt_override)},
	 .bus = 0, .source_irq = 1, .global_irq = 1, .inti_flags = 0},
	{.header = {.type = ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
	            .length = sizeof(struct acpi_madt_interrupt_override)},
	 .bus = 0, .source_irq = 3, .global_irq = 3, .inti_flags = 0},
	{.header = {.type = ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
	            .length = sizeof(struct acpi_madt_interrupt_override)},
	 .bus = 0, .source_irq = 4, .global_irq = 4, .inti_flags = 0},
};


/* this test will run the "kernel" in the negative address space. We hope. */
void *low1m;
volatile int shared = 0;
volatile int quit = 0;

/* total hack. If the vm runs away we want to get control again. */
unsigned int maxresume = (unsigned int) -1;

#define MiB 0x100000ull
#define GiB (1ull << 30)
#define GKERNBASE (16*MiB)
#define KERNSIZE (128*MiB+GKERNBASE)
uint8_t _kernel[KERNSIZE];

unsigned long long *p512, *p1, *p2m;

void **my_retvals;
int nr_threads = 4;
int debug = 0;
int resumeprompt = 0;
/* unlike Linux, this shared struct is for both host and guest. */
//	struct virtqueue *constoguest =
//		vring_new_virtqueue(0, 512, 8192, 0, inpages, NULL, NULL, "test");

void vapic_status_dump(FILE *f, void *vapic);

#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1)
#error "Get a gcc newer than 4.4.0"
#else
#define BITOP_ADDR(x) "+m" (*(volatile long *) (x))
#endif

#define LOCK_PREFIX "lock "
#define ADDR				BITOP_ADDR(addr)
static inline int test_and_set_bit(int nr, volatile unsigned long *addr);
static int default_nic = 1;

pthread_t timerthread_struct;

void timer_thread(void *arg)
{
	uint8_t vector;
	uint32_t initial_count;
	while (1) {
		vector = ((uint32_t *)gpci.vapic_addr)[0x32] & 0xff;
		initial_count = ((uint32_t *)gpci.vapic_addr)[0x38];
		if (vector && initial_count)
			vmm_interrupt_guest(vm, 0, vector);
		uthread_usleep(100000);
	}
	fprintf(stderr, "SENDING TIMER\n");
}


// FIXME.
volatile int consdata = 0;

/* TODO: pass a core id to poke_guest */
static void virtio_poke_guest(uint8_t vec)
{
	vmm_interrupt_guest(vm, 0, vec);
}

static struct virtio_mmio_dev cons_mmio_dev = {
	.poke_guest = virtio_poke_guest,
	/* At the moment irq numbers cannot be below 24; this is a problem with
	 * the IOAPIC and Interrupt Source Override Structure. */
	.irq = 26,
};

static struct virtio_console_config cons_cfg;
static struct virtio_console_config cons_cfg_d;

static struct virtio_vq_dev cons_vqdev = {
	.name = "console",
	.dev_id = VIRTIO_ID_CONSOLE,
	.dev_feat =
	    (1ULL << VIRTIO_F_VERSION_1) | (1 << VIRTIO_RING_F_INDIRECT_DESC),
	.num_vqs = 2,
	.cfg = &cons_cfg,
	.cfg_d = &cons_cfg_d,
	.cfg_sz = sizeof(struct virtio_console_config),
	.transport_dev = &cons_mmio_dev,
	.vqs = {
			{
				.name = "cons_receiveq",
				.qnum_max = 64,
				.srv_fn = cons_receiveq_fn,
				.vqdev = &cons_vqdev
			},
			{
				.name = "cons_transmitq",
				.qnum_max = 64,
				.srv_fn = cons_transmitq_fn,
				.vqdev = &cons_vqdev
			},
		}
};

static struct virtio_mmio_dev net_mmio_dev = {
	.poke_guest = virtio_poke_guest,
	.irq = 27,
};

static struct virtio_net_config net_cfg = {
	.max_virtqueue_pairs = 1
};
static struct virtio_net_config net_cfg_d = {
	.max_virtqueue_pairs = 1
};

static struct virtio_vq_dev net_vqdev = {
	.name = "network",
	.dev_id = VIRTIO_ID_NET,
	.dev_feat = (1ULL << VIRTIO_F_VERSION_1 | 1 << VIRTIO_NET_F_MAC),

	.num_vqs = 2,
	.cfg = &net_cfg,
	.cfg_d = &net_cfg_d,
	.cfg_sz = sizeof(struct virtio_net_config),
	.transport_dev = &net_mmio_dev,
	.vqs = {
		{
			.name = "net_receiveq",
			.qnum_max = 64,
			.srv_fn = net_receiveq_fn,
			.vqdev = &net_vqdev
		},
		{
			.name = "net_transmitq",
			.qnum_max = 64,
			.srv_fn = net_transmitq_fn,
			.vqdev = &net_vqdev
		},
	}
};

void lowmem() {
	__asm__ __volatile__ (".section .lowmem, \"aw\"\n\tlow: \n\t.=0x1000\n\t.align 0x100000\n\t.previous\n");
}

static uint8_t acpi_tb_checksum(uint8_t *buffer, uint32_t length)
{
	uint8_t sum = 0;
	uint8_t *end = buffer + length;
	fprintf(stderr, "tbchecksum %p for %d", buffer, length);
	while (buffer < end) {
		if (end - buffer < 2)
			fprintf(stderr, "%02x\n", sum);
		sum = (uint8_t)(sum + *(buffer++));
	}
	fprintf(stderr, " is %02x\n", sum);
	return (sum);
}

static void gencsum(uint8_t *target, void *data, int len)
{
	uint8_t csum;
	// blast target to zero so it does not get counted
	// (it might be in the struct we checksum) And, yes, it is, goodness.
	fprintf(stderr, "gencsum %p target %p source %d bytes\n", target, data, len);
	*target = 0;
	csum  = acpi_tb_checksum((uint8_t *)data, len);
	*target = ~csum + 1;
	fprintf(stderr, "Cmoputed is %02x\n", *target);
}

static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
{
	int oldbit;

	asm volatile(LOCK_PREFIX "bts %2,%1\n\t"
		     "sbb %0,%0" : "=r" (oldbit), ADDR : "Ir" (nr) : "memory");

	return oldbit;
}

static void pir_dump()
{
	unsigned long *pir_ptr = gpci.posted_irq_desc;
	int i;
	fprintf(stderr, "-------Begin PIR dump-------\n");
	for (i = 0; i < 8; i++){
		fprintf(stderr, "Byte %d: 0x%016x\n", i, pir_ptr[i]);
	}
	fprintf(stderr, "-------End PIR dump-------\n");
}

int main(int argc, char **argv)
{
	struct boot_params *bp;
	char *cmdline_default = "earlyprintk=vmcall,keep"
		                    " console=hvc0"
		                    " nosmp"
		                    " maxcpus=1"
		                    " acpi.debug_layer=0x2"
		                    " acpi.debug_level=0xffffffff"
		                    " apic=debug"
		                    " noexec=off"
		                    " nohlt"
		                    " init=/bin/launcher"
		                    " lapic=notscdeadline"
		                    " lapictimerfreq=1000000"
		                    " pit=none";
	char *cmdline_extra = "\0";
	char *cmdline;
	uint64_t *p64;
	void *a = (void *)0xe0000;
	struct acpi_table_rsdp *r;
	struct acpi_table_fadt *f;
	struct acpi_table_madt *m;
	struct acpi_table_xsdt *x;
	// lowmem is a bump allocated pointer to 2M at the "physbase" of memory
	void *lowmem = (void *) 0x1000000;
	int amt;
	int vmmflags = 0; // Disabled probably forever. VMM_VMCALL_PRINTF;
	uint64_t entry = 0x1200000, kerneladdress = 0x1200000;
	int ret;
	uintptr_t size;
	void * xp;
	int kfd = -1;
	static char cmd[512];
	int i;
	uint8_t csum;
	void *coreboot_tables = (void *) 0x1165000;
	void *a_page;
	struct vm_trapframe *vm_tf;
	uint64_t tsc_freq_khz;
	char *cmdlinep;
	int cmdlinesz, len;

	fprintf(stderr, "%p %p %p %p\n", PGSIZE, PGSHIFT, PML1_SHIFT,
			PML1_PTE_REACH);


	// mmap is not working for us at present.
	if ((uint64_t)_kernel > GKERNBASE) {
		fprintf(stderr, "kernel array @%p is above , GKERNBASE@%p sucks\n", _kernel, GKERNBASE);
		exit(1);
	}
	memset(_kernel, 0, sizeof(_kernel));
	memset(lowmem, 0xff, 2*1048576);
	vm->low4k = malloc(PGSIZE);
	memset(vm->low4k, 0xff, PGSIZE);
	// avoid at all costs, requires too much instruction emulation.
	//low4k[0x40e] = 0;
	//low4k[0x40f] = 0xe0;

	//Place mmap(Gan)
	a_page = mmap((void *)0xfee00000, PGSIZE, PROT_READ | PROT_WRITE,
		              MAP_POPULATE | MAP_ANONYMOUS, -1, 0);
	fprintf(stderr, "a_page mmap pointer %p\n", a_page);

	if (a_page == (void *) -1) {
		perror("Could not mmap APIC");
		exit(1);
	}
	if (((uint64_t)a_page & 0xfff) != 0) {
		perror("APIC page mapping is not page aligned");
		exit(1);
	}

	memset(a_page, 0, 4096);
	((uint32_t *)a_page)[0x30/4] = 0x01060015;
	//((uint32_t *)a_page)[0x30/4] = 0xDEADBEEF;

	argc--, argv++;
	// switches ...
	// Sorry, I don't much like the gnu opt parsing code.
	while (1) {
		if (*argv[0] != '-')
			break;
		switch(argv[0][1]) {
		case 'd':
			debug++;
			break;
		case 'v':
			vmmflags |= VMM_VMCALL_PRINTF;
			break;
		case 'm':
			argc--, argv++;
			maxresume = strtoull(argv[0], 0, 0);
			break;
		case 'c':
			argc--, argv++;
			cmdline_extra = argv[0];
		case 'g':	/* greedy */
			parlib_never_yield = TRUE;
			break;
		case 's':	/* scp */
			parlib_wants_to_be_mcp = FALSE;
			break;
		default:
			fprintf(stderr, "BMAFR\n");
			break;
		}
		argc--, argv++;
	}
	if (argc < 1) {
		fprintf(stderr, "Usage: %s vmimage [-n (no vmcall printf)] [coreboot_tables [loadaddress [entrypoint]]]\n", argv[0]);
		exit(1);
	}
	if (argc > 1)
		coreboot_tables = (void *) strtoull(argv[1], 0, 0);
	if (argc > 2)
		kerneladdress = strtoull(argv[2], 0, 0);
	if (argc > 3)
		entry = strtoull(argv[3], 0, 0);
	kfd = open(argv[0], O_RDONLY);
	if (kfd < 0) {
		perror(argv[0]);
		exit(1);
	}
	// read in the kernel, one 2M page at a time.
	xp = (void *)kerneladdress;
	for(;;) {
		amt = read(kfd, xp, PML2_PTE_REACH);
		if (amt < 0) {
			perror("read");
			exit(1);
		}
		if (amt == 0) {
			break;
		}
		xp += amt;
	}
	size = ROUNDUP((uintptr_t)xp - kerneladdress, PML2_PTE_REACH);
	fprintf(stderr, "Read in %d bytes\n", size);
	close(kfd);

	// The low 1m so we can fill in bullshit like ACPI. */
	// And, sorry, due to the STUPID format of the RSDP for now we need the low 1M.
	low1m = mmap((int*)4096, MiB-4096, PROT_READ | PROT_WRITE,
	                 MAP_ANONYMOUS, -1, 0);
	if (low1m != (void *)4096) {
		perror("Unable to mmap low 1m");
		exit(1);
	}
	memset(low1m, 0xff, MiB-4096);
	r = a;
	fprintf(stderr, "install rsdp to %p\n", r);
	*r = rsdp;
	a += sizeof(*r);
	r->xsdt_physical_address = (uint64_t)a;
	gencsum(&r->checksum, r, ACPI_RSDP_CHECKSUM_LENGTH);
	if ((csum = acpi_tb_checksum((uint8_t *) r, ACPI_RSDP_CHECKSUM_LENGTH)) != 0) {
		fprintf(stderr, "RSDP has bad checksum; summed to %x\n", csum);
		exit(1);
	}

	/* Check extended checksum if table version >= 2 */
	gencsum(&r->extended_checksum, r, ACPI_RSDP_XCHECKSUM_LENGTH);
	if ((rsdp.revision >= 2) &&
	    (acpi_tb_checksum((uint8_t *) r, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) {
		fprintf(stderr, "RSDP has bad checksum v2\n");
		exit(1);
	}

	/* just leave a bunch of space for the xsdt. */
	/* we need to zero the area since it has pointers. */
	x = a;
	a += sizeof(*x) + 8*sizeof(void *);
	memset(x, 0, a - (void *)x);
	fprintf(stderr, "install xsdt to %p\n", x);
	*x = xsdt;
	x->table_offset_entry[0] = 0;
	x->table_offset_entry[1] = 0;
	x->header.length = a - (void *)x;

	f = a;
	fprintf(stderr, "install fadt to %p\n", f);
	*f = fadt;
	x->table_offset_entry[0] = (uint64_t)f; // fadt MUST be first in xsdt!
	a += sizeof(*f);
	f->header.length = a - (void *)f;

	f->Xdsdt = (uint64_t) a;
	fprintf(stderr, "install dsdt to %p\n", a);
	memcpy(a, &DSDT_DSDTTBL_Header, 36);
	a += 36;

	gencsum(&f->header.checksum, f, f->header.length);
	if (acpi_tb_checksum((uint8_t *)f, f->header.length) != 0) {
		fprintf(stderr, "fadt has bad checksum v2\n");
		exit(1);
	}

	m = a;
	*m = madt;
	x->table_offset_entry[3] = (uint64_t) m;
	a += sizeof(*m);
	fprintf(stderr, "install madt to %p\n", m);
	memmove(a, &Apic0, sizeof(Apic0));
	a += sizeof(Apic0);
	memmove(a, &Apic1, sizeof(Apic1));
	a += sizeof(Apic1);
	memmove(a, &X2Apic0, sizeof(X2Apic0));
	a += sizeof(X2Apic0);
	memmove(a, &isor, sizeof(isor));
	a += sizeof(isor);
	m->header.length = a - (void *)m;

	gencsum(&m->header.checksum, m, m->header.length);
	if (acpi_tb_checksum((uint8_t *) m, m->header.length) != 0) {
		fprintf(stderr, "madt has bad checksum v2\n");
		exit(1);
	}

	gencsum(&x->header.checksum, x, x->header.length);
	if ((csum = acpi_tb_checksum((uint8_t *) x, x->header.length)) != 0) {
		fprintf(stderr, "XSDT has bad checksum; summed to %x\n", csum);
		exit(1);
	}

	fprintf(stderr, "allchecksums ok\n");

	hexdump(stdout, r, a-(void *)r);

	a = (void *)(((unsigned long)a + 0xfff) & ~0xfff);
	gpci.posted_irq_desc = a;
	memset(a, 0, 4096);
	a += 4096;
	gpci.vapic_addr = a;
	memset(a, 0, 4096);
	((uint32_t *)a)[0x30/4] = 0x01060014;
	p64 = a;
	// set up apic values? do we need to?
	// qemu does this.
	//((uint8_t *)a)[4] = 1;
	a += 4096;
	gpci.apic_addr = (void*)0xfee00000;

	/* Allocate memory for, and zero the bootparams
	 * page before writing to it, or Linux thinks
	 * we're talking crazy.
	 */
	a += 4096;
	bp = a;
	memset(bp, 0, 4096);

	/* Put the e820 memory region information in the boot_params */
	bp->e820_entries = 5;
	int e820i = 0;

	/* Give it just a tiny bit of memory -- 60k -- at low memory. */
	bp->e820_map[e820i].addr = 0;
	bp->e820_map[e820i].size = 4 * 1024;
	bp->e820_map[e820i++].type = E820_RESERVED;

	bp->e820_map[e820i].addr = 4 * 1024;
	bp->e820_map[e820i].size = 64 * 1024 - 4 * 1024;
	bp->e820_map[e820i++].type = E820_RAM;

	bp->e820_map[e820i].addr = 64 * 1024;
	bp->e820_map[e820i].size = 16 * 1048576 - 64 * 1024;
	bp->e820_map[e820i++].type = E820_RESERVED;

	bp->e820_map[e820i].addr = 16 * 1048576;
	bp->e820_map[e820i].size = 128 * 1048576;
	bp->e820_map[e820i++].type = E820_RAM;

	bp->e820_map[e820i].addr = 0xf0000000;
	bp->e820_map[e820i].size = 0x10000000;
	bp->e820_map[e820i++].type = E820_RESERVED;

	/* The MMIO address of the console device is really the address of an
	 * unbacked EPT page: accesses to this page will cause a page fault that
	 * traps to the host, which will examine the fault, see it was for the
	 * known MMIO address, and fulfill the MMIO read or write on the guest's
	 * behalf accordingly. We place the virtio space at 512 GB higher than the
	 * guest physical memory to avoid a full page table walk. */
	uint64_t virtio_mmio_base_addr = ROUNDUP((bp->e820_map[e820i - 1].addr +
	                                          bp->e820_map[e820i - 1].size),
	                                         512 * GiB);

	cons_mmio_dev.addr =
	    virtio_mmio_base_addr + PGSIZE * VIRTIO_MMIO_CONSOLE_DEV;
	cons_mmio_dev.vqdev = &cons_vqdev;
	vm->virtio_mmio_devices[VIRTIO_MMIO_CONSOLE_DEV] = &cons_mmio_dev;

	net_mmio_dev.addr =
	    virtio_mmio_base_addr + PGSIZE * VIRTIO_MMIO_NETWORK_DEV;
	net_mmio_dev.vqdev = &net_vqdev;
	vm->virtio_mmio_devices[VIRTIO_MMIO_NETWORK_DEV] = &net_mmio_dev;

	net_init_fn(&net_vqdev, default_nic);

	/* Set the kernel command line parameters */
	a += 4096;
	cmdline = a;
	a += 4096;
	bp->hdr.cmd_line_ptr = (uintptr_t) cmdline;

	tsc_freq_khz = get_tsc_freq()/1000;
	len = snprintf(cmdline, 4096, "%s tscfreq=%lld %s", cmdline_default,
	               tsc_freq_khz, cmdline_extra);

	cmdlinesz = 4096 - len;
	cmdlinep = cmdline + len;

	for (int i = 0; i < VIRTIO_MMIO_MAX_NUM_DEV; i++) {
		if (vm->virtio_mmio_devices[i] == NULL)
			continue;
		/* Append all the virtio mmio base addresses. */
		len = snprintf(cmdlinep, cmdlinesz,
		               " virtio_mmio.device=1K@0x%llx:%lld",
		               vm->virtio_mmio_devices[i]->addr,
		               vm->virtio_mmio_devices[i]->irq);
		if (len >= cmdlinesz) {
			fprintf(stderr, "Too many arguments to the linux command line.");
			exit(1);
		}
		cmdlinesz -= len;
		cmdlinep += len;
	}

	vm->nr_gpcs = 1;
	vm->gpcis = &gpci;
	ret = vmm_init(vm, vmmflags);
	assert(!ret);

	/* Allocate 3 pages for page table pages: a page of 512 GiB
	 * PTEs with only one entry filled to point to a page of 1 GiB
	 * PTEs; a page of 1 GiB PTEs with only one entry filled to
	 * point to a page of 2 MiB PTEs; and a page of 2 MiB PTEs,
	 * only a subset of which will be filled. */
	ret = posix_memalign((void **)&p512, PGSIZE, 3 * PGSIZE);
	if (ret) {
		perror("ptp alloc");
		exit(1);
	}

	/* Set up a 1:1 ("identity") page mapping from guest virtual
	 * to guest physical using the (host virtual)
	 * `kerneladdress`. This mapping is used for only a short
	 * time, until the guest sets up its own page tables. Be aware
	 * that the values stored in the table are physical addresses.
	 * This is subtle and mistakes are easily disguised due to the
	 * identity mapping, so take care when manipulating these
	 * mappings. */
	p1 = &p512[NPTENTRIES];
	p2m = &p512[2 * NPTENTRIES];

	p512[PML4(kerneladdress)] = (uint64_t)p1 | PTE_KERN_RW;
	p1[PML3(kerneladdress)] = (uint64_t)p2m | PTE_KERN_RW;
	for (uintptr_t i = 0; i < size; i += PML2_PTE_REACH) {
		p2m[PML2(kerneladdress + i)] =
		    (uint64_t)(kerneladdress + i) | PTE_KERN_RW | PTE_PS;
	}

	uint8_t *kernel = (void *)GKERNBASE;
	//write_coreboot_table(coreboot_tables, ((void *)VIRTIOBASE) /*kernel*/, KERNSIZE + 1048576);
	hexdump(stdout, coreboot_tables, 512);
	fprintf(stderr, "p512 %p p512[0] is 0x%lx p1 %p p1[0] is 0x%x\n", p512, p512[0], p1, p1[0]);

	vmm_run_task(vm, timer_thread, 0);

	vm_tf = gth_to_vmtf(vm->gths[0]);
	vm_tf->tf_cr3 = (uint64_t) p512;
	vm_tf->tf_rip = entry;
	vm_tf->tf_rsp = 0;
	vm_tf->tf_rsi = (uint64_t) bp;
	start_guest_thread(vm->gths[0]);

	uthread_sleep_forever();
	return 0;
}