Sec S3c2443x Test B D Driver «INSTANT»

The Sec S3c2443x Test B D Driver is a reference implementation of a low‑level device driver for the Sec S3c2443x series of System‑on‑Chip (SoC) peripherals. It is primarily used in embedded Linux environments to validate the functionality of the “Test B D” hardware block, which provides a programmable interface for secure data handling, cryptographic acceleration, and DMA‑based I/O.

struct resource *res; int ret;

| Parameter | Meaning | |-----------|---------| | mode | 0 = buffer‑overflow test, 1 = timing jitter, 2 = fault‑injection | | iterations | Number of stress cycles (max 10 000) | | seed | Pseudo‑random seed for pattern generation | Sec S3c2443x Test B D Driver

struct sec_testbd_dma_desc __u64 src_addr; /* Physical address of source buffer */ __u64 dst_addr; /* Physical address of destination buffer */ __u32 length; /* Transfer size in bytes (max 4 MiB) */ __u32 flags; /* SEC_TESTBD_DMA_ENCRYPT ; The driver writes the descriptor into the SMI registers, triggers the transfer, and waits for the completion interrupt. Errors such as address misalignment or length overflow generate -EINVAL . Through SEC_TESTBD_IOCTL_CRYPTO , the user can request a single‑shot operation: The Sec S3c2443x Test B D Driver is

/* 1. Acquire memory region */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); testbd->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(testbd->base)) return PTR_ERR(testbd->base); Errors such as address misalignment or length overflow

device_create(class, NULL, dev_num, NULL, "sec_testbd"); return 0;

# Perform a secure DMA copy (user‑space program) ./testbd_tool --dma --src 0x80000000 --dst 0x81000000 --len 1048576 --encrypt