Date: Tue, 03 May 2011 15:10:26 +0200 From: Philip Soeberg <philip-freebsd1@soeberg.net> To: freebsd-hackers@freebsd.org Subject: Runtime check for PAE option on BSD 6+ i386 Message-ID: <4DBFFEC2.4010506@soeberg.net>
next in thread | raw e-mail | index | archive | help
Hi fellow FreeBSD hackers, I've been using the following poor-man's approach in my driver init for ages in an attempt at detecting PAE option on BSD 6 (or greater) i386 kernels, as I depend on dmabus(9) but provide a loadable kernel module only. >>> if (sizeof(void*) == 4) { if (((uint64_t)(cnt.v_page_count * cnt.v_page_size) / 1073741824) >= 4) { printf("FreeBSD i386 detected with PAE option enabled. FreeBSD PAE type\n"); printf("kernels does not support loadable modules which use DMA. Please\n"); printf("reconfigure your kernel for non-PAE or switch to amd64 kernel.\n"); return EFAULT; } } <<< afaik there's a sysctl method of checking this per BSD7 (or is it 8?), but what about BSD6? Any hints on how I can runtime detect the above? Thanx, Phil
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4DBFFEC2.4010506>