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#include "PR/os_internal.h"
#include "PR/rcp.h"
#include "PR/R4300.h"
#define STEP 0x100000
#define SIZE_4MB 0x400000
#define SIZE_8MB 0x800000
#if BUILD_VERSION >= VERSION_J
u32 osGetMemSize(void) {
vu32* ptr;
u32 size = SIZE_4MB;
u32 data0;
u32 data1;
while (size < SIZE_8MB) {
ptr = (vu32*)(K1BASE + size);
data0 = *ptr;
data1 = ptr[STEP / 4 - 1];
*ptr ^= ~0;
ptr[STEP / 4 - 1] ^= ~0;
if ((*ptr != (data0 ^ ~0)) || (ptr[STEP / 4 - 1] != (data1 ^ ~0))) {
return size;
}
*ptr = data0;
ptr[STEP / 4 - 1] = data1;
size += STEP;
}
return size;
}
#else
u32 osGetMemSize(void) {
u32* memory;
u32 memsize = SIZE_4MB - STEP;
do {
memsize += STEP;
memory = (u32*)(memsize + K1BASE);
memory[0] = 0x12345678;
memory[STEP / 4 - 1] = 0x87654321;
} while (memory[0] == 0x12345678 && memory[STEP / 4 - 1] == 0x87654321);
return memsize;
}
#endif
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