mini/memory.c

#include "types.h"
#include "start.h"
#include "memory.h"
#include "utils.h"
#include "gecko.h"
#include "hollywood.h"
#include "irq.h"

void _dc_inval_entries(void *start, int count);
void _dc_flush_entries(const void *start, int count);
void _dc_flush(void);
void _dc_inval(void);
void _ic_inval(void);
void _drain_write_buffer(void);
void _tlb_inval(void);

extern u32 __page_table[4096];

#define LINESIZE 0x20
#define CACHESIZE 0x4000

// TODO: move to hollywood.h once we figure out WTF
#define		HW_100			(HW_REG_BASE + 0x100)
#define		HW_104			(HW_REG_BASE + 0x104)
#define		HW_108			(HW_REG_BASE + 0x108)
#define		HW_10c			(HW_REG_BASE + 0x10c)
#define		HW_110			(HW_REG_BASE + 0x110)
#define		HW_114			(HW_REG_BASE + 0x114)
#define		HW_118			(HW_REG_BASE + 0x118)
#define		HW_11c			(HW_REG_BASE + 0x11c)
#define		HW_120			(HW_REG_BASE + 0x120)
#define		HW_124			(HW_REG_BASE + 0x124)
#define		HW_130			(HW_REG_BASE + 0x130)
#define		HW_134			(HW_REG_BASE + 0x134)
#define		HW_138			(HW_REG_BASE + 0x138)
#define		HW_188			(HW_REG_BASE + 0x188)
#define		HW_18C			(HW_REG_BASE + 0x18c)

// what is this thing doing anyway?
// and why only on reads?
u32 _mc_read32(u32 addr)
{
	u32 data;
	u32 tmp130 = 0;
	// this seems to be a bug workaround
	if(!(read32(HW_VERSION) & 0xF0))
	{
		tmp130 = read32(HW_130);
		write32(HW_130, tmp130 | 0x400);
		// Dummy reads?
		read32(HW_138);
		read32(HW_138);
		read32(HW_138);
		read32(HW_138);
	}
	data = read32(addr);
	read32(HW_VERSION); //???

	if(!(read32(HW_VERSION) & 0xF0))
		write32(HW_130, tmp130);

	return data;
}

void _magic_bullshit(int type) {
	u32 mask = 10;
	switch(type) {
		case 0: mask = 0x8000; break;
		case 1: mask = 0x4000; break;
		case 2: mask = 0x0001; break;
		case 3: mask = 0x0002; break;
		case 4: mask = 0x0004; break;
		case 5: mask = 0x0008; break;
		case 6: mask = 0x0010; break;
		case 7: mask = 0x0020; break;
		case 8: mask = 0x0040; break;
		case 9: mask = 0x0080; break;
		case 10: mask = 0x0100; break;
		case 11: mask = 0x1000; break;
		case 12: mask = 0x0000; break;
	}
	//NOTE: 0xd8b000x, not 0xd8b400x!
	u32 val = _mc_read32(0xd8b0008);
	if(val & mask) {
		if((type >= 2) && (type <= 10)) {
			while((read32(HW_18C) & 0xF) == 9)
				set32(HW_188, 0x10000);
			clear32(HW_188, 0x10000);
			set32(HW_188, 0x2000000);
			mask32(HW_124, 0x7c0, 0x280);
			set32(HW_134, 0x400);
			while((read32(HW_18C) & 0xF) != 9);
			set32(HW_100, 0x400);
			set32(HW_104, 0x400);
			set32(HW_108, 0x400);
			set32(HW_10c, 0x400);
			set32(HW_110, 0x400);
			set32(HW_114, 0x400);
			set32(HW_118, 0x400);
			set32(HW_11c, 0x400);
			set32(HW_120, 0x400);
			write32(0xd8b0008, _mc_read32(0xd8b0008) & (~mask));
			write32(0xd8b0008, _mc_read32(0xd8b0008) | mask);
			clear32(HW_134, 0x400);
			clear32(HW_100, 0x400);
			clear32(HW_104, 0x400);
			clear32(HW_108, 0x400);
			clear32(HW_10c, 0x400);
			clear32(HW_110, 0x400);
			clear32(HW_114, 0x400);
			clear32(HW_118, 0x400);
			clear32(HW_11c, 0x400);
			clear32(HW_120, 0x400);
			clear32(HW_188, 0x2000000);
			mask32(HW_124, 0x7c0, 0xc0);
		} else {
			if((type == 11) || (type == 0) || (type == 1)) {
				write32(0xd8b0008, val & (~mask));
				// wtfux
				write32(0xd8b0008, val | mask);
				write32(0xd8b0008, val | mask);
				write32(0xd8b0008, val | mask);
			}
		}
	}
}

void magic_bullshit(int type)
{
	_magic_bullshit(type);
	if(type != 0)
		_magic_bullshit(0);
}

void ahb_memflush(enum AHBDEV dev)
{
	u16 req = 0;
	u16 ack;
	int i;

	switch(dev)
	{
		case MEMORY:
			req = 1;
			break;
		default:
			if((dev >= RAW0) && (dev <= RAWF))
			{
				req = dev - RAW0;
			} else {
				gecko_printf("ahb_memflush(0x%x): Invalid device\n", dev);
				return;
			}
			break;
	}

	write16(MEM_FLUSHREQ, req);

	for(i=0;i<1000000;i++) {
		ack = read16(MEM_FLUSHACK);
		_magic_bullshit(0);
		if(ack == req)
			break;
	}
	write16(MEM_FLUSHREQ, 0);
	if(i>=1000000) {
		gecko_printf("ahb_memflush(%d): Flush (0x%x) did not ack!\n", dev, req);
	}
}

void dc_flushrange(const void *start, u32 size)
{
	u32 cookie = irq_kill();
	if(size > 0x4000) {
		_dc_flush();
	} else {
		void *end = ALIGN_FORWARD(((u8*)start) + size, LINESIZE);
		start = ALIGN_BACKWARD(start, LINESIZE);
		_dc_flush_entries(start, (end - start) / LINESIZE);
	}
	_drain_write_buffer();
	ahb_memflush(MEMORY);
	irq_restore(cookie);
}

void dc_invalidaterange(void *start, u32 size)
{
	u32 cookie = irq_kill();
	void *end = ALIGN_FORWARD(((u8*)start) + size, LINESIZE);
	start = ALIGN_BACKWARD(start, LINESIZE);
	_dc_inval_entries(start, (end - start) / LINESIZE);
	_magic_bullshit(0);
	irq_restore(cookie);
}

void dc_flushall(void)
{
	u32 cookie = irq_kill();
	_dc_flush();
	_drain_write_buffer();
	ahb_memflush(MEMORY);
	irq_restore(cookie);
}

void ic_invalidateall(void)
{
	u32 cookie = irq_kill();
	_ic_inval();
	_magic_bullshit(0);
	irq_restore(cookie);
}

void mem_protect(int enable, void *start, void *end)
{
	write16(MEM_PROT, enable?1:0);
	write16(MEM_PROT_START, (((u32)start) & 0xFFFFFFF) >> 12);
	write16(MEM_PROT_END, (((u32)end) & 0xFFFFFFF) >> 12);
	udelay(10);
}

void mem_setswap(int enable)
{
	u32 d = read32(HW_MEMMIRR);

	if((d & 0x20) && !enable)
		write32(HW_MEMMIRR, d & ~0x20);
	if((!(d & 0x20)) && enable)
		write32(HW_MEMMIRR, d | 0x20);

}

#define SECTION				0x012

#define	NONBUFFERABLE		0x000
#define	BUFFERABLE			0x004
#define	WRITETHROUGH_CACHE	0x008
#define	WRITEBACK_CACHE		0x00C

#define DOMAIN(x)			((x)<<5)

#define AP_ROM				0x000
#define AP_NOUSER			0x400
#define AP_ROUSER			0x800
#define AP_RWUSER			0xC00

// from, to, size: units of 1MB
void map_section(u32 from, u32 to, u32 size, u32 attributes)
{
	attributes |= SECTION;
	while(size--) {
		__page_table[from++] = (to++<<20) | attributes;
	}
}

void mem_initialize(void)
{
	u32 cookie = irq_kill();

	gecko_printf("MEM: cleaning up\n");

	_ic_inval();
	_dc_inval();
	_tlb_inval();

	gecko_printf("MEM: unprotecting memory\n");

	mem_protect(0,NULL,NULL);

	gecko_printf("MEM: mapping sections\n");

	memset32(__page_table, 0, 16384);

	map_section(0x000, 0x000, 0x018, WRITEBACK_CACHE | DOMAIN(0) | AP_RWUSER);
	map_section(0x100, 0x100, 0x040, WRITEBACK_CACHE | DOMAIN(0) | AP_RWUSER);
	map_section(0x0d0, 0x0d0, 0x001, NONBUFFERABLE | DOMAIN(0) | AP_RWUSER);
	map_section(0x0d8, 0x0d8, 0x001, NONBUFFERABLE | DOMAIN(0) | AP_RWUSER);
	map_section(0xfff, 0xfff, 0x001, WRITEBACK_CACHE | DOMAIN(0) | AP_RWUSER);

	set_dacr(0xFFFFFFFF); //manager access for all domains, ignore AP
	set_ttbr((u32)__page_table); //configure translation table

	_drain_write_buffer();

	gecko_printf("MEM: enabling caches\n");

	u32 cr = get_cr();
	cr |= 0x1004; //ICACHE/DCACHE and MMU enable
	set_cr(cr);

	gecko_printf("MEM: enabling MMU\n");

	cr |= 0x0001; //ICACHE/DCACHE and MMU enable
	set_cr(cr);

	gecko_printf("MEM: init done\n");

	irq_restore(cookie);
}

void mem_shutdown(void)
{
	u32 cookie = irq_kill();
	_dc_flush();
	_drain_write_buffer();
	u32 cr = get_cr();
	cr &= ~0x1005; //disable ICACHE, DCACHE, MMU
	set_cr(cr);
	_ic_inval();
	_dc_inval();
	_tlb_inval();
	irq_restore(cookie);
}