ipc.c

/*
	mini - a Free Software replacement for the Nintendo/BroadOn IOS.
	inter-processor communications

Copyright (C) 2008, 2009	Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008, 2009	Haxx Enterprises <bushing@gmail.com>
Copyright (C) 2008, 2009	Sven Peter <svenpeter@gmail.com>
Copyright (C) 2009			Andre Heider "dhewg" <dhewg@wiibrew.org>
Copyright (C) 2009		John Kelley <wiidev@kelley.ca>

# This code is licensed to you under the terms of the GNU GPL, version 2;
# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*/

#include <stdarg.h>
#include "string.h"
#include "types.h"
#include "irq.h"
#include "memory.h"
#include "utils.h"
#include "hollywood.h"
#include "gecko.h"
#include "ipc.h"
#include "nand.h"
#include "sdhc.h"
#include "sdmmc.h"
#include "crypto.h"
#include "boot2.h"
#include "powerpc.h"
#include "panic.h"

#define MINI_VERSION_MAJOR 1
#define MINI_VERSION_MINOR 3

static volatile ipc_request in_queue[IPC_IN_SIZE] ALIGNED(32) MEM2_BSS;
static volatile ipc_request out_queue[IPC_OUT_SIZE] ALIGNED(32) MEM2_BSS;
static volatile ipc_request slow_queue[IPC_SLOW_SIZE];

extern char __mem2_area_start[];
extern const char git_version[];

// These defines are for the ARMCTRL regs
// See http://wiibrew.org/wiki/Hardware/IPC

#define		IPC_CTRL_Y1	0x01
#define		IPC_CTRL_X2	0x02
#define		IPC_CTRL_X1	0x04
#define		IPC_CTRL_Y2	0x08

#define		IPC_CTRL_IX1	0x10
#define		IPC_CTRL_IX2	0x20

// Our definitions for this IPC interface
#define		IPC_CTRL_OUT	IPC_CTRL_Y1
#define		IPC_CTRL_IN	IPC_CTRL_X1
#define		IPC_CTRL_IRQ_IN	IPC_CTRL_IX1

// reset both flags (X* for ARM and Y* for PPC)
#define		IPC_CTRL_RESET	0x06

const ipc_infohdr __ipc_info ALIGNED(32) MEM2_RODATA = {
	.magic = "IPC",
	.version = 1,
	.mem2_boundary = __mem2_area_start,
	.ipc_in = in_queue,
	.ipc_in_size = IPC_IN_SIZE,
	.ipc_out = out_queue,
	.ipc_out_size = IPC_OUT_SIZE,
};

static u16 slow_queue_head;
static vu16 slow_queue_tail;

static u16 in_head;
static u16 out_tail;

static inline void poke_outtail(u16 num)
{
	mask32(HW_IPC_ARMMSG, 0xFFFF, num);
}

static inline void poke_inhead(u16 num)
{
	mask32(HW_IPC_ARMMSG, 0xFFFF0000, num<<16);
}

static inline u16 peek_intail(void)
{
	return read32(HW_IPC_PPCMSG) & 0xFFFF;
}

static inline u16 peek_outhead(void)
{
	return read32(HW_IPC_PPCMSG) >> 16;
}

void ipc_post(u32 code, u32 tag, u32 num_args, ...)
{
	int arg = 0;
	va_list ap;
	u32 cookie = irq_kill();

	if(peek_outhead() == ((out_tail + 1)&(IPC_OUT_SIZE-1))) {
		gecko_printf("IPC: out queue full, PPC slow/dead/flooded\n");
		while(peek_outhead() == ((out_tail + 1)&(IPC_OUT_SIZE-1)));
	}
	out_queue[out_tail].code = code;
	out_queue[out_tail].tag = tag;
	if(num_args) {
		va_start(ap, num_args);
		while(num_args--) {
			out_queue[out_tail].args[arg++] = va_arg(ap, u32);
		}
		va_end(ap);
	}
	dc_flush_block_fast((void*)&out_queue[out_tail]);
	out_tail = (out_tail+1)&(IPC_OUT_SIZE-1);
	poke_outtail(out_tail);
	write32(HW_IPC_ARMCTRL, IPC_CTRL_IRQ_IN | IPC_CTRL_OUT);

	irq_restore(cookie);
}

void ipc_flush(void)
{
	while(peek_outhead() != out_tail);
}

static u32 process_slow(volatile ipc_request *req)
{
	//gecko_printf("IPC: process slow_queue @ %p\n",req);

	//gecko_printf("IPC: req %08x %08x [%08x %08x %08x %08x %08x %08x]\n", req->code, req->tag,
	//	req->args[0], req->args[1], req->args[2], req->args[3], req->args[4], req->args[5]);

	switch(req->device) {
		case IPC_DEV_SYS:
			switch(req->req) {
				case IPC_SYS_PING: //PING can be both slow and fast for testing purposes
					ipc_post(req->code, req->tag, 0);
					break;
				case IPC_SYS_JUMP:
					return req->args[0];
				case IPC_SYS_GETVERS:
					ipc_post(req->code, req->tag, 1, MINI_VERSION_MAJOR << 16 | MINI_VERSION_MINOR);
					break;
				case IPC_SYS_GETGITS:
					strlcpy((char *)req->args[0], git_version, 32);
					dc_flushrange((void *)req->args[0], 32);
					ipc_post(req->code, req->tag, 0);
					break;
				default:
					gecko_printf("IPC: unknown SLOW SYS request %04x\n", req->req);
			}
			break;
		case IPC_DEV_NAND:
			nand_ipc(req);
			break;
		case IPC_DEV_SDHC:
			sdhc_ipc(req);
			break;
		case IPC_DEV_SDMMC:
			sdmmc_ipc(req);
			break;
		case IPC_DEV_KEYS:
			crypto_ipc(req);
			break;
		case IPC_DEV_AES:
			aes_ipc(req);
			break;
		case IPC_DEV_BOOT2:
			return boot2_ipc(req);
			break;
		case IPC_DEV_PPC:
			powerpc_ipc(req);
			break;
		default:
			gecko_printf("IPC: unknown SLOW request %02x-%04x\n", req->device, req->req);
	}

	return 0;
}

void ipc_enqueue_slow(u8 device, u16 req, u32 num_args, ...)
{
	int arg = 0;
	va_list ap;

	if(slow_queue_head == ((slow_queue_tail + 1)&(IPC_SLOW_SIZE-1))) {
		gecko_printf("IPC: Slowqueue overrun\n");
		panic2(0, PANIC_IPCOVF);
	}

	slow_queue[slow_queue_tail].flags = IPC_SLOW;
	slow_queue[slow_queue_tail].device = device;
	slow_queue[slow_queue_tail].req = req;
	slow_queue[slow_queue_tail].tag = 0;

	if(num_args) {
		va_start(ap, num_args);
		while(num_args--)
			slow_queue[slow_queue_tail].args[arg++] = va_arg(ap, u32);
		va_end(ap);
	}

	slow_queue_tail = (slow_queue_tail+1)&(IPC_SLOW_SIZE-1);
}

static void process_in(void)
{
	volatile ipc_request *req = &in_queue[in_head];

	//gecko_printf("IPC: process in %d @ %p\n",in_head,req);

	dc_inval_block_fast((void*)req);

	//gecko_printf("IPC: req %08x %08x [%08x %08x %08x %08x %08x %08x]\n", req->code, req->tag,
	//	req->args[0], req->args[1], req->args[2], req->args[3], req->args[4], req->args[5]);

	if(req->flags & IPC_FAST) {
		switch(req->device) {
			case IPC_DEV_SYS:
				// handle fast SYS requests here
				switch(req->req) {
					case IPC_SYS_PING:
						ipc_post(req->code, req->tag, 0);
						break;
					case IPC_SYS_WRITE32:
						write32(req->args[0], req->args[1]);
						break;
					case IPC_SYS_WRITE16:
						write16(req->args[0], req->args[1]);
						break;
					case IPC_SYS_WRITE8:
						write8(req->args[0], req->args[1]);
						break;
					case IPC_SYS_READ32:
						ipc_post(req->code, req->tag, 1, read32(req->args[0]));
						break;
					case IPC_SYS_READ16:
						ipc_post(req->code, req->tag, 1, read16(req->args[0]));
						break;
					case IPC_SYS_READ8:
						ipc_post(req->code, req->tag, 1, read8(req->args[0]));
						break;
					case IPC_SYS_SET32:
						set32(req->args[0], req->args[1]);
						break;
					case IPC_SYS_SET16:
						set16(req->args[0], req->args[1]);
						break;
					case IPC_SYS_SET8:
						set8(req->args[0], req->args[1]);
						break;
					case IPC_SYS_CLEAR32:
						clear32(req->args[0], req->args[1]);
						break;
					case IPC_SYS_CLEAR16:
						clear16(req->args[0], req->args[1]);
						break;
					case IPC_SYS_CLEAR8:
						clear8(req->args[0], req->args[1]);
						break;
					case IPC_SYS_MASK32:
						mask32(req->args[0], req->args[1], req->args[2]);
						break;
					case IPC_SYS_MASK16:
						mask16(req->args[0], req->args[1], req->args[2]);
						break;
					case IPC_SYS_MASK8:
						mask8(req->args[0], req->args[1], req->args[2]);
						break;
					default:
						gecko_printf("IPC: unknown FAST SYS request %04x\n", req->req);
						break;
				}
				break;
			default:
				gecko_printf("IPC: unknown FAST request %02x-%04x\n", req->device, req->req);
				break;
		}
	} else {
		if(slow_queue_head == ((slow_queue_tail + 1)&(IPC_SLOW_SIZE-1))) {
			gecko_printf("IPC: Slowqueue overrun\n");
			panic2(0, PANIC_IPCOVF);
		}

		slow_queue[slow_queue_tail] = *req;
		slow_queue_tail = (slow_queue_tail+1)&(IPC_SLOW_SIZE-1);
	}
}

void ipc_irq(void)
{
	int donebell = 0;
	while(read32(HW_IPC_ARMCTRL) & IPC_CTRL_IN) {
		write32(HW_IPC_ARMCTRL, IPC_CTRL_IRQ_IN | IPC_CTRL_IN);
		while(peek_intail() != in_head) {
			process_in();
			in_head = (in_head+1)&(IPC_IN_SIZE-1);
			poke_inhead(in_head);
		}
		donebell++;
	}
	if(!donebell)
		gecko_printf("IPC: IRQ but no bell!\n");
}

void ipc_initialize(void)
{
	write32(HW_IPC_ARMMSG, 0);
	write32(HW_IPC_PPCMSG, 0);
	write32(HW_IPC_PPCCTRL, IPC_CTRL_RESET);
	write32(HW_IPC_ARMCTRL, IPC_CTRL_RESET);
	slow_queue_head = 0;
	slow_queue_tail = 0;
	in_head = 0;
	out_tail = 0;
	irq_enable(IRQ_IPC);
	write32(HW_IPC_ARMCTRL, IPC_CTRL_IRQ_IN);
}

void ipc_shutdown(void)
{
	// Don't kill message registers so our PPC side doesn't get confused
	//write32(HW_IPC_ARMMSG, 0);
	//write32(HW_IPC_PPCMSG, 0);
	// Do kill flags so Nintendo's SDK doesn't get confused
	write32(HW_IPC_PPCCTRL, IPC_CTRL_RESET);
	write32(HW_IPC_ARMCTRL, IPC_CTRL_RESET);
	irq_disable(IRQ_IPC);
}

u32 ipc_process_slow(void)
{
	u32 vector = 0;

	while (!vector) {
		while (!vector && (slow_queue_head != slow_queue_tail)) {
			vector = process_slow(&slow_queue[slow_queue_head]);
			slow_queue_head = (slow_queue_head+1)&(IPC_SLOW_SIZE-1);
		}

		if (!vector)
		{
			gecko_process();

			u32 cookie = irq_kill();
			if(slow_queue_head == slow_queue_tail)
				irq_wait();
			irq_restore(cookie);
		}
	}
	return vector;
}