savezelda/loader/loader.h

// Copyright 2008-2009  Segher Boessenkool  <segher@kernel.crashing.org>
// 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

#ifndef _LOADER_H
#define _LOADER_H

#include <stddef.h>


// String functions.

size_t strlen(const char *);
size_t strnlen(const char *, size_t);
void *memset(void *, int, size_t);
void *memcpy(void *, const void *, size_t);
int memcmp(const void *, const void *, size_t);


// Basic types.

typedef unsigned char u8;
typedef unsigned short int u16;
typedef unsigned int u32;
typedef unsigned long long int u64;

static inline u16 le16(const u8 *p)
{
	return p[0] | (p[1] << 8);
}

static inline u32 le32(const u8 *p)
{
	return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}


// Basic I/O.

static inline u32 read32(u32 addr)
{
	u32 x;

	asm volatile("lwz %0,0(%1) ; sync" : "=r"(x) : "b"(0xc0000000 | addr));

	return x;
}

static inline void write32(u32 addr, u32 x)
{
	asm("stw %0,0(%1) ; eieio" : : "r"(x), "b"(0xc0000000 | addr));
}

static inline u16 read16(u32 addr)
{
	u16 x;

	asm volatile("lhz %0,0(%1) ; sync" : "=r"(x) : "b"(0xc0000000 | addr));

	return x;
}

static inline void write16(u32 addr, u16 x)
{
	asm("sth %0,0(%1) ; eieio" : : "r"(x), "b"(0xc0000000 | addr));
}


// Address mapping.

static inline u32 virt_to_phys(const void *p)
{
	return (u32)p & 0x7fffffff;
}

static inline void *phys_to_virt(u32 x)
{
	return (void *)(x | 0x80000000);
}


// Cache synchronisation.

void sync_before_read(void *p, u32 len);
void sync_after_write(const void *p, u32 len);
void sync_before_exec(const void *p, u32 len);


// Time.

void udelay(u32 us);


// Special purpose registers.

#define mtspr(n, x) do { asm("mtspr %1,%0" : : "r"(x), "i"(n)); } while (0)
#define mfspr(n) ({ \
	u32 x; asm volatile("mfspr %0,%1" : "=r"(x) : "i"(n)); x; \
})


// Exceptions.

void exception_init(void);


// USB Gecko.

void usbgecko_init(void);
int usbgecko_checkgecko(void);
void usbgecko_console_putc(u8 c);

u8 usbgecko_flash_read8(u32 offset);
u32 usbgecko_flash_read32(u32 offset);


// Version string.

extern const char version[];


// Video.

void video_init(void);
void fb_putc(char);


// Console.

void console_init(void);
int printf(const char *fmt, ...);


// SD card.

int sd_init(void);
int sd_read_sector(u8 *data, u32 offset);
int sd_close(void);


// FAT.

int fat_init(void);
int fat_open(const char *name);
int fat_read(void *data, u32 len);


// ELF.

int valid_elf_image(void *addr);
void *load_elf_image(void *addr);


// IOS.

struct ioctlv {
	void *data;
	u32 len;
};

int ios_open(const char *filename, u32 mode);
int ios_close(int fd);
int ios_read(int fd, void *data, u32 len);
int ios_write(int fd, const void *data, u32 len);
int ios_seek(int fd, int where, int whence);
int ios_ioctl(int fd, u32 n, const void *in, u32 inlen, void *out, u32 outlen);
int ios_ioctlv(int fd, u32 n, u32 in_count, u32 out_count, struct ioctlv *vec);

void reset_ios(void);

#endif