Hi Matthias,
On 9/17/20 12:38 PM, [email protected] wrote:
Add option to allow purgatory printing on arm64 hardware
> by passing the console name which should be used.
> +static uint64_t find_purgatory_sink(const char *console)
> +{
> + int fd, ret;
> + char folder[255], device[255], mem[255];
> + struct stat sb;
> + char buffer[18];
> + uint64_t iomem = 0x0;
> +
> + if (!console)
> + return 0;
> +
> + sprintf(device, "/sys/class/tty/%s", console);
> + if (!stat(folder, &sb) == 0 && S_ISDIR(sb.st_mode)) {
> + fprintf(stderr, "kexec: %s: No valid console found for %s\n",
> + __func__, device);
> + return 0;
> + }
> +
> + sprintf(mem, "%s%s", device, "/iomem_base");
> + printf("console memory read from %s\n", mem);
> +
> + fd = open(mem, O_RDONLY);
> + if (fd < 0) {
> + fprintf(stderr, "kexec: %s: No able to open %s\n",
> + __func__, mem);
> + return 0;
> + }
> +
> + memset(buffer, '\0', sizeof(char) * 18);
I think I'd like to just see 'memset(buffer, 0, sizeof(buffer));'.
> + ret = read(fd, buffer, 18);
And 'ret = read(fd, buffer, sizeof(buffer));'.
> + if (ret < 0) {
> + fprintf(stderr, "kexec: %s: not able to read fd\n", __func__);
> + close(fd);
> + return 0;
> + }
> +
> + sscanf(buffer, "%lx", &iomem);
> + printf("console memory is at %#lx\n", iomem);
> +
> + close(fd);
> + return iomem;
> +}
> +
Otherwise, looks OK.
-Geoff
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