libc: add strnlen()

2017-09-15T07:49:27+00:00

Sometimes handy. Signed-off-by: Oliver O'Halloran Signed-off-by: Stewart Smith

libc/string: add memcpy_from_ci()

2016-10-05T03:42:26+00:00

This adds memcpy_from_ci, a cache inhibited version of memcpy, required by secure boot. The secure boot verification code is stored in a secure ROM and the logic that contains the ROM within the processor is implemented in a way that it only responds to CI (cache inhibited) operations. Due to performance issues we copy the verification code from the secure ROM to RAM and we use memcpy_ci for that. What makes memcpy_ci vs ordinary memcpy? memcpy copies data like in the example below and the compiler translates that to load instructions that are not cache inhibited (e.g. lbzx - load byte and zero indexed). In other words, the data is cached. a[i] = b[i] memcpy_ci copies data using the cache inhibited version of load instructions: in_8() and in_be32(), both defined in include/io.h. These functions use lbzcix and lwzcix assembly instructions, respectively. In this case, the data is not cached as required by the logic that contains the ROM. *((uint8_t*) destp) = in_8((uint8_t*)srcp); *((uint32_t*) destp) = in_be32((uint32_t*)srcp) Signed-off-by: Claudio Carvalho Signed-off-by: Stewart Smith

Add "ffs" inline function

2016-07-06T09:30:48+00:00

Signed-off-by: Benjamin Herrenschmidt Acked-by: Michael Neuling Signed-off-by: Stewart Smith

Initial commit of Open Source release

2014-07-02T05:36:20+00:00

Signed-off-by: Benjamin Herrenschmidt

talos-skiboot/libc/include/string.h, branch master

libc: add strnlen()

libc/string: add memcpy_from_ci()

Add "ffs" inline function

Initial commit of Open Source release