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/*
 * Copyright (c) 2022 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <mach/exclaves.h>
#include <string/strings.h>
#include <sys/cdefs.h>
#include <mach/exclaves_l4.h>

#if defined(__LP64__)
#define EXCLAVES_CTL_TRAP _exclaves_ctl_trap
#else
#define EXCLAVES_CTL_TRAP(port, opf, id, buffer, size, offset, size2) ({ \
	(void)port; (void)opf; (void)id; (void)buffer;                   \
	(void)size; (void)offset; (void)size2;                           \
	KERN_NOT_SUPPORTED;                                              \
})
#endif /* __LP64__ */

kern_return_t
exclaves_endpoint_call(mach_port_t port, exclaves_id_t endpoint_id,
    mach_vm_address_t msg_buffer, mach_vm_size_t size, exclaves_tag_t *tag,
    exclaves_error_t *error)
{
#if defined(__LP64__)
	kern_return_t kr = KERN_SUCCESS;
	if (size != Exclaves_L4_IpcBuffer_Size) {
		return KERN_INVALID_ARGUMENT;
	}
	Exclaves_L4_IpcBuffer_t *ipcb;
	ipcb = Exclaves_L4_IpcBuffer_Ptr((void*)msg_buffer);
	ipcb->mr[Exclaves_L4_Ipc_Mr_Tag] = *tag;
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(ENDPOINT_CALL, 0);
	kr = EXCLAVES_CTL_TRAP(port, opf, endpoint_id, msg_buffer, size, 0, 0);
	*tag = ipcb->mr[Exclaves_L4_Ipc_Mr_Tag];
	*error = EXCLAVES_XNU_PROXY_CR_RETVAL(ipcb);
	return kr;
#else
#pragma unused(port, endpoint_id, msg_buffer, size, tag, error)
	return KERN_NOT_SUPPORTED;
#endif /* defined(__LP64__) */
}

kern_return_t
exclaves_outbound_buffer_create(mach_port_t port, const char *buffer_name,
    mach_vm_size_t size, mach_port_t *out_outbound_buffer_port)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_CREATE, 0);
	return EXCLAVES_CTL_TRAP(port, opf, buffer_name,
	           (uintptr_t)out_outbound_buffer_port, size,
	           EXCLAVES_BUFFER_PERM_READ, 0);
}

kern_return_t
exclaves_outbound_buffer_copyout(mach_port_t outbound_buffer_port,
    mach_vm_address_t dst_buffer, mach_vm_size_t size1, mach_vm_size_t offset1,
    mach_vm_size_t size2, mach_vm_size_t offset2)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_COPYOUT, 0);
	return EXCLAVES_CTL_TRAP(outbound_buffer_port, opf,
	           (exclaves_id_t) offset1, dst_buffer, size1, size2, offset2);
}

kern_return_t
exclaves_inbound_buffer_create(mach_port_t port, const char *buffer_name,
    mach_vm_size_t size, mach_port_t *out_inbound_buffer_port)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_CREATE, 0);
	return EXCLAVES_CTL_TRAP(port, opf, buffer_name,
	           (uintptr_t)out_inbound_buffer_port, size,
	           EXCLAVES_BUFFER_PERM_WRITE, 0);
}

kern_return_t
exclaves_inbound_buffer_copyin(mach_port_t inbound_buffer_port,
    mach_vm_address_t src_buffer, mach_vm_size_t size1, mach_vm_size_t offset1,
    mach_vm_size_t size2, mach_vm_size_t offset2)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_COPYIN, 0);
	return EXCLAVES_CTL_TRAP(inbound_buffer_port, opf,
	           (exclaves_id_t) offset1, src_buffer, size1, size2, offset2);
}

static void
reverse(char *string)
{
	for (int i = 0, j = strlen(string) - 1; i < j; i++, j--) {
		char c = string[i];
		string[i] = string[j];
		string[j] = c;
	}
}

static void
itoa(uint32_t num, char *string)
{
	int i = 0;
	do {
		string[i++] = num % 10 + '0';
		num /= 10;
	} while (num > 0);

	string[i] = '\0';
	reverse(string);
}

kern_return_t
exclaves_named_buffer_create(mach_port_t port, exclaves_id_t buffer_id,
    mach_vm_size_t size, mach_port_t *out_named_buffer_port)
{
	char buffer_name[48] = "com.apple.named_buffer.";
	itoa(buffer_id, &buffer_name[strlen(buffer_name)]);

	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_CREATE, 0);
	const uint32_t perms = EXCLAVES_BUFFER_PERM_READ | EXCLAVES_BUFFER_PERM_WRITE;
	return EXCLAVES_CTL_TRAP(port, opf, buffer_name,
	           (uintptr_t)out_named_buffer_port, size, perms, 0);
}

kern_return_t
exclaves_named_buffer_copyin(mach_port_t named_buffer_port,
    mach_vm_address_t src_buffer, mach_vm_size_t size, mach_vm_size_t offset)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_COPYIN, 0);
	return EXCLAVES_CTL_TRAP(named_buffer_port, opf, (exclaves_id_t)offset,
	           src_buffer, size, 0, 0);
}

kern_return_t
exclaves_named_buffer_copyout(mach_port_t named_buffer_port,
    mach_vm_address_t dst_buffer, mach_vm_size_t size, mach_vm_size_t offset)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NAMED_BUFFER_COPYOUT, 0);
	return EXCLAVES_CTL_TRAP(named_buffer_port, opf, (exclaves_id_t)offset,
	           dst_buffer, size, 0, 0);
}

kern_return_t
exclaves_launch_conclave(mach_port_t port, void *arg1,
    uint64_t arg2)
{
	if (arg1 != NULL || arg2 != 0) {
		return KERN_INVALID_ARGUMENT;
	}

	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(LAUNCH_CONCLAVE, 0);
	return EXCLAVES_CTL_TRAP(port, opf, 0, 0, 0, 0, 0);
}

kern_return_t
exclaves_lookup_service(mach_port_t port, const char *name,
    exclaves_id_t *resource_id)
{
	struct exclaves_resource_user conclave_resource_user;
	kern_return_t kr;
	mach_vm_size_t size = sizeof(struct exclaves_resource_user);

	strlcpy(conclave_resource_user.r_name, name, MAXCONCLAVENAME);
	conclave_resource_user.r_type = 0;
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(LOOKUP_SERVICES, 0);

	kr = EXCLAVES_CTL_TRAP(port, opf, 0,
	    (mach_vm_address_t)&conclave_resource_user, size, 0, 0);
	if (kr == KERN_SUCCESS && resource_id) {
		*resource_id = conclave_resource_user.r_id;
	}
	return kr;
}

kern_return_t
exclaves_boot(mach_port_t port, exclaves_boot_stage_t stage)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(BOOT, 0);
	return EXCLAVES_CTL_TRAP(port, opf, stage, 0, 0, 0, 0);
}

kern_return_t
exclaves_audio_buffer_create(mach_port_t port, const char *buffer_name,
    mach_vm_size_t size, mach_port_t* out_audio_buffer_port)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(AUDIO_BUFFER_CREATE, 0);
	return EXCLAVES_CTL_TRAP(port, opf, (exclaves_id_t) buffer_name,
	           (uintptr_t) out_audio_buffer_port, size, 0, 0);
}

kern_return_t
exclaves_audio_buffer_copyout(mach_port_t audio_buffer_port,
    mach_vm_address_t dst_buffer,
    mach_vm_size_t size1, mach_vm_size_t offset1,
    mach_vm_size_t size2, mach_vm_size_t offset2)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(AUDIO_BUFFER_COPYOUT, 0);
	return EXCLAVES_CTL_TRAP(audio_buffer_port, opf,
	           (exclaves_id_t) offset1, dst_buffer, size1, size2, offset2);
}

kern_return_t
exclaves_sensor_create(mach_port_t port, const char *sensor_name,
    mach_port_t *sensor_port)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(SENSOR_CREATE, 0);
	return EXCLAVES_CTL_TRAP(port, opf, (exclaves_id_t) sensor_name,
	           (uintptr_t) sensor_port, 0, 0, 0);
}

kern_return_t
exclaves_sensor_start(mach_port_t sensor_port, uint64_t flags,
    exclaves_sensor_status_t *sensor_status)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(SENSOR_START, 0);
	return EXCLAVES_CTL_TRAP(sensor_port, opf, flags,
	           (uintptr_t) sensor_status, 0, 0, 0);
}

kern_return_t
exclaves_sensor_stop(mach_port_t sensor_port, uint64_t flags,
    exclaves_sensor_status_t *sensor_status)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(SENSOR_STOP, 0);
	return EXCLAVES_CTL_TRAP(sensor_port, opf, flags,
	           (uintptr_t) sensor_status, 0, 0, 0);
}

kern_return_t
exclaves_sensor_status(mach_port_t sensor_port, uint64_t flags,
    exclaves_sensor_status_t *sensor_status)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(SENSOR_STATUS, 0);
	return EXCLAVES_CTL_TRAP(sensor_port, opf, flags,
	           (uintptr_t) sensor_status, 0, 0, 0);
}

kern_return_t
exclaves_notification_create(__unused mach_port_t port, const char *name,
    uint64_t *notification_id)
{
	const uint32_t opf = EXCLAVES_CTL_OP_AND_FLAGS(NOTIFICATION_RESOURCE_LOOKUP, 0);
	kern_return_t kr;
	struct exclaves_resource_user notification_resource_user;
	if (name == NULL) {
		return KERN_INVALID_ARGUMENT;
	}
	if (notification_id == NULL) {
		return KERN_INVALID_ARGUMENT;
	}
	strlcpy(notification_resource_user.r_name, name, MAXCONCLAVENAME);
	kr = EXCLAVES_CTL_TRAP(port, opf, (exclaves_id_t)0,
	    (mach_vm_address_t)&notification_resource_user,
	    sizeof(notification_resource_user), 0, 0);
	if (kr == KERN_SUCCESS) {
		*notification_id = notification_resource_user.r_port;
	}
	return kr;
}