xref: /haiku/src/add-ons/kernel/drivers/misc/poke.cpp (revision f866c78257f5911c7487c48773eec7d4ac3ebf31)

/*
 * Copyright 2005, Oscar Lesta. All rights reserved.
 * Copyright 2018, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 */


#include <Drivers.h>
#include <KernelExport.h>
#include <ISA.h>
#include <PCI.h>

#if defined(__i386__) || defined(__x86_64__)
#include <thread.h>
#endif

#include "poke.h"

/*
 TODO: maintain a list of mapped areas in the cookie
 and only allow unmapping them, and clean them up on free.
 */

static status_t poke_open(const char*, uint32, void**);
static status_t poke_close(void*);
static status_t poke_free(void*);
static status_t poke_control(void*, uint32, void*, size_t);
static status_t poke_read(void*, off_t, void*, size_t*);
static status_t poke_write(void*, off_t, const void*, size_t*);


static const char* poke_name[] = {
    "misc/" POKE_DEVICE_NAME,
    NULL
};


device_hooks poke_hooks = {
	poke_open,
	poke_close,
	poke_free,
	poke_control,
	poke_read,
	poke_write,
};

int32 api_version = B_CUR_DRIVER_API_VERSION;

isa_module_info* isa;
pci_module_info* pci;


status_t
init_hardware(void)
{
	return B_OK;
}


status_t
init_driver(void)
{
	if (get_module(B_ISA_MODULE_NAME, (module_info**)&isa) < B_OK)
		return ENOSYS;

	if (get_module(B_PCI_MODULE_NAME, (module_info**)&pci) < B_OK) {
		put_module(B_ISA_MODULE_NAME);
		return ENOSYS;
	}

	return B_OK;
}


void
uninit_driver(void)
{
	put_module(B_ISA_MODULE_NAME);
	put_module(B_PCI_MODULE_NAME);
}


const char**
publish_devices(void)
{
	return poke_name;
}


device_hooks*
find_device(const char* name)
{
	return &poke_hooks;
}


//	#pragma mark -


status_t
poke_open(const char* name, uint32 flags, void** cookie)
{
	*cookie = NULL;

	if (getuid() != 0 && geteuid() != 0)
		return EPERM;

#if defined(__i386__) || defined(__x86_64__)
	/* on x86, raise the IOPL so that outb/inb will work */
	iframe* frame = x86_get_user_iframe();
	int iopl = 3;
	frame->flags &= ~X86_EFLAGS_IO_PRIVILEG_LEVEL;
	frame->flags |= (iopl << X86_EFLAGS_IO_PRIVILEG_LEVEL_SHIFT)
		& X86_EFLAGS_IO_PRIVILEG_LEVEL;
#endif

	return B_OK;
}


status_t
poke_close(void* cookie)
{
	return B_OK;
}


status_t
poke_free(void* cookie)
{
#if defined(__i386__) || defined(__x86_64__)
	iframe* frame = x86_get_user_iframe();
	int iopl = 0;
	frame->flags &= ~X86_EFLAGS_IO_PRIVILEG_LEVEL;
	frame->flags |= (iopl << X86_EFLAGS_IO_PRIVILEG_LEVEL_SHIFT)
		& X86_EFLAGS_IO_PRIVILEG_LEVEL;
#endif

	return B_OK;
}


status_t
poke_control(void* cookie, uint32 op, void* arg, size_t length)
{
	switch (op) {
		case POKE_PORT_READ:
		{
			status_t result = B_OK;
			port_io_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(port_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			switch (ioctl.size) {
				case 1:
					ioctl.value = isa->read_io_8(ioctl.port);
				break;
				case 2:
					ioctl.value = isa->read_io_16(ioctl.port);
				break;
				case 4:
					ioctl.value = isa->read_io_32(ioctl.port);
				break;
				default:
					result = B_BAD_VALUE;
			}

			if (user_memcpy(arg, &ioctl, sizeof(port_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			return result;
		}

		case POKE_PORT_WRITE:
		{
			status_t result = B_OK;
			port_io_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(port_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			switch (ioctl.size) {
				case 1:
					isa->write_io_8(ioctl.port, ioctl.value);
					break;
				case 2:
					isa->write_io_16(ioctl.port, ioctl.value);
					break;
				case 4:
					isa->write_io_32(ioctl.port, ioctl.value);
					break;
				default:
					result = B_BAD_VALUE;
			}

			return result;
		}

		case POKE_PORT_INDEXED_READ:
		{
			port_io_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(port_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			isa->write_io_8(ioctl.port, ioctl.size);
			ioctl.value = isa->read_io_8(ioctl.port + 1);

			if (user_memcpy(arg, &ioctl, sizeof(port_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			return B_OK;
		}

		case POKE_PORT_INDEXED_WRITE:
		{
			port_io_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(port_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			isa->write_io_8(ioctl.port, ioctl.size);
			isa->write_io_8(ioctl.port + 1, ioctl.value);
			return B_OK;
		}

		case POKE_PCI_READ_CONFIG:
		{
			pci_io_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(pci_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			ioctl.value = pci->read_pci_config(ioctl.bus, ioctl.device,
				ioctl.function, ioctl.offset, ioctl.size);
			if (user_memcpy(arg, &ioctl, sizeof(pci_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			return B_OK;
		}

		case POKE_PCI_WRITE_CONFIG:
		{
			pci_io_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(pci_io_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			pci->write_pci_config(ioctl.bus, ioctl.device, ioctl.function,
				ioctl.offset, ioctl.size, ioctl.value);
			return B_OK;
		}

		case POKE_GET_NTH_PCI_INFO:
		{
			pci_info_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(pci_info_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			pci_info info;
			ioctl.status = pci->get_nth_pci_info(ioctl.index, &info);

			if (user_memcpy(ioctl.info, &info, sizeof(pci_info)) != B_OK)
				return B_BAD_ADDRESS;
			if (user_memcpy(arg, &ioctl, sizeof(pci_info_args)) != B_OK)
				return B_BAD_ADDRESS;
			return B_OK;
		}

		case POKE_GET_PHYSICAL_ADDRESS:
		{
			mem_map_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(mem_map_args)) != B_OK)
				return B_BAD_ADDRESS;
			physical_entry table;
			status_t result;

			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			result = get_memory_map(ioctl.address, ioctl.size, &table, 1);
			ioctl.physical_address = table.address;
			ioctl.size = table.size;
			if (user_memcpy(arg, &ioctl, sizeof(mem_map_args)) != B_OK)
				return B_BAD_ADDRESS;
			return result;
		}

		case POKE_MAP_MEMORY:
		{
			mem_map_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(mem_map_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			char name[B_OS_NAME_LENGTH];
			if (user_strlcpy(name, ioctl.name, B_OS_NAME_LENGTH) < B_OK)
				return B_BAD_ADDRESS;

			ioctl.area = map_physical_memory(name,
				(addr_t)ioctl.physical_address, ioctl.size, ioctl.flags,
				ioctl.protection, (void**)&ioctl.address);

			if (user_memcpy(arg, &ioctl, sizeof(mem_map_args)) != B_OK)
				return B_BAD_ADDRESS;
			return ioctl.area;
		}

		case POKE_UNMAP_MEMORY:
		{
			mem_map_args ioctl;
			if (user_memcpy(&ioctl, arg, sizeof(mem_map_args)) != B_OK)
				return B_BAD_ADDRESS;
			if (ioctl.signature != POKE_SIGNATURE)
				return B_BAD_VALUE;

			return delete_area(ioctl.area);
		}
	}

	return B_BAD_VALUE;
}


status_t
poke_read(void* cookie, off_t position, void* buffer, size_t* numBytes)
{
	*numBytes = 0;
	return B_NOT_ALLOWED;
}


status_t
poke_write(void* cookie, off_t position, const void* buffer, size_t* numBytes)
{
	*numBytes = 0;
	return B_NOT_ALLOWED;
}