fuse_dump.c

#include <string.h>
#include <stdio.h>

#include <switch.h>

#define FUSE_PHYS_ADDR 0x7000F800
#define FUSE_ARRAY_SIZE 0x100
#define FUSE_CTRL ((*(volatile u32 *)fuse_virt_addr))
#define FUSE_REG_ADDR ((*(volatile u32 *)(fuse_virt_addr + 4)))
#define FUSE_REG_READ ((*(volatile u32 *)(fuse_virt_addr + 8)))
#define FUSE_CACHED ((*(volatile u32 *)(fuse_virt_addr + 0x100)))

#define CLK_RST_PHYS_ADDR 0x60006000
#define CLK_RST_CONTROLLER_MISC_CLK_ENB_0 ((*(volatile u32 *)(clk_rst_virt_addr + 0x48)))

u64 clk_rst_virt_addr = 0;
u64 fuse_virt_addr = 0;

Result get_io_regions(void)
{
	Result clk_rst_res = svcQueryIoMapping(&clk_rst_virt_addr, CLK_RST_PHYS_ADDR, 0x400);
	Result fuse_res = svcQueryIoMapping(&fuse_virt_addr, FUSE_PHYS_ADDR, 0x400);
	return clk_rst_res | fuse_res;
}

void clk_rst_set_fuse_state(int fuse_state)
{
  CLK_RST_CONTROLLER_MISC_CLK_ENB_0 = CLK_RST_CONTROLLER_MISC_CLK_ENB_0 & 0xEFFFFFFF | (fuse_state << 28) & 0x1FFFFFFF;
}

int main(int argc, char **argv)
{
	gfxInitDefault();
	consoleInit(NULL);

	printf("Fuse dumper v1 by stuckpixel\n");

	Result res = get_io_regions();

	FILE *cached_f = fopen("sdmc:/fuses_cached.bin", "wb");
	FILE *fuse_f = fopen("sdmc:/fuses.bin", "wb");

	if(!cached_f | !fuse_f)
	{
		printf("Failed to open file!\n");
		gfxExit();
		return 0;
	}

	if(!res)
	{
		clk_rst_set_fuse_state(1); //enable fuse registers
		FUSE_CTRL &= 0xFBFFFFFF; //clear the powerdown flag
		for(int i = 0; i < FUSE_ARRAY_SIZE; i++)
		{
			FUSE_REG_ADDR = i; //set the fuse to be dumped
			FUSE_CTRL = ((FUSE_CTRL >> 2) << 2) | 1; //start the operation
			while(FUSE_CTRL << 11 >> 27 != 4); //wait for read to finish
			fwrite(&FUSE_REG_READ, 1, 4, fuse_f); //write data to file
		}
		fwrite(&FUSE_CACHED, 1, 0x300, cached_f); //write cached fuses to a file

		/* close files */
		fclose(cached_f);
		fclose(fuse_f);

		clk_rst_set_fuse_state(0); //disables fuse registers
		printf("Fuses successfully dumped!\nPress the + button to exit\n");
	}
	else
	{
		printf("Failed to map one or more I/O regions!\n");
	}

	while(appletMainLoop())
	{
		hidScanInput();
		u32 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
		if (kDown & KEY_PLUS) break;

		gfxFlushBuffers();
		gfxSwapBuffers();
		gfxWaitForVsync();
	}

	gfxExit();
	return 0;
}