libctru/libctru/source/os.c

103 lines
2.1 KiB
C

#include <3ds/types.h>
#include <3ds/os.h>
#include <3ds/svc.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* __datetime0 =
(datetime_t*) 0x1FF81020;
static volatile datetime_t* __datetime1 =
(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() {
u32 s1, s2 = *__datetime_selector & 1;
datetime_t dt;
do {
s1 = s2;
if(!s1)
dt = *__datetime0;
else
dt = *__datetime1;
s2 = *__datetime_selector & 1;
} while(s2 != s1);
u64 delta = svcGetSystemTick() - dt.update_tick;
// Work around the VFP not supporting 64-bit integer <--> floating point conversion
double temp = (u32)(delta >> 32);
temp *= 0x100000000ULL;
temp += (u32)delta;
u32 offset = temp / 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.";
}
}