os.c

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#include <3ds.h>

#define TICKS_PER_MSEC 268123.480

typedef struct {
    u64 date_time;
    u64 update_tick;
    //...
} datetime_t;

static volatile u32* __datetime_selector =
    (u32*) 0x1FF81000;
static volatile datetime_t* __datetime1 =
    (datetime_t*) 0x1FF81020;
static volatile datetime_t* __datetime2 =
    (datetime_t*) 0x1FF81040;


u32 osConvertVirtToPhys(u32 vaddr)
{
    if(vaddr >= 0x14000000 && vaddr < 0x1c000000)
        return vaddr + 0x0c000000; // LINEAR heap
    if(vaddr >= 0x1F000000 && vaddr < 0x1F600000)
        return vaddr - 0x07000000; // VRAM
    if(vaddr >= 0x1FF00000 && vaddr < 0x1FF80000)
        return vaddr + 0x00000000; // DSP memory
    if(vaddr >= 0x30000000 && vaddr < 0x40000000)
        return vaddr - 0x10000000; // Only available under FIRM v8+ for certain processes.
    return 0;
}

u32 osConvertOldLINEARMemToNew(u32 vaddr)
{
    if(vaddr >= 0x30000000 && vaddr < 0x40000000)return vaddr;
    if(vaddr >= 0x14000000 && vaddr < 0x1c000000)return vaddr+=0x1c000000;
    return 0;
}

// Returns number of milliseconds since 1st Jan 1900 00:00.
u64 osGetTime() {
    volatile datetime_t* dt;

    switch(*__datetime_selector & 1) {
    case 0:
        dt = __datetime1;
        break;
    case 1:
        dt = __datetime2;
        break;
    }

    u64 offset = (svcGetSystemTick() - dt->update_tick) / TICKS_PER_MSEC;
    return dt->date_time + offset;
}

u32 osGetFirmVersion() {
    return (*(u32*)0x1FF80000) & ~0xFF;
}

u32 osGetKernelVersion() {
    return (*(u32*)0x1FF80060) & ~0xFF;
}

const char* osStrError(u32 error) {
    switch((error>>26) & 0x3F) {
    case 0:
        return "Success.";
    case 1:
        return "Nothing happened.";
    case 2:
        return "Would block.";
    case 3:
        return "Not enough resources.";
    case 4:
        return "Not found.";
    case 5:
        return "Invalid state.";
    case 6:
        return "Unsupported.";
    case 7:
        return "Invalid argument.";
    case 8:
        return "Wrong argument.";
    case 9:
        return "Interrupted.";
    case 10:
        return "Internal error.";
    default:
        return "Unknown.";
    }
}