diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/mips-cm.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h index d66d0e00365b..465a7c1f737b 100644 --- a/arch/mips/include/asm/mips-cm.h +++ b/arch/mips/include/asm/mips-cm.h @@ -36,12 +36,12 @@ extern phys_addr_t __mips_cm_phys_base(void); /* * mips_cm_is64 - determine CM register width * - * The CM register width is processor and CM specific. A 64-bit processor - * usually has a 64-bit CM and a 32-bit one has a 32-bit CM but a 64-bit - * processor could come with a 32-bit CM. Moreover, accesses on 64-bit CMs - * can be done either using regular 64-bit load/store instructions, or 32-bit - * load/store instruction on 32-bit register pairs. We opt for using 64-bit - * accesses on 64-bit CMs and kernels and 32-bit in any other case. + * The CM register width is determined by the version of the CM, with CM3 + * introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs. + * However we may run a kernel built for MIPS32 on a system with 64 bit GCRs, + * or vice-versa. This variable indicates the width of the memory accesses + * that the kernel will perform to GCRs, which may differ from the actual + * width of the GCRs. * * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses. */ |