diff options
Diffstat (limited to 'sys/mips/sibyte/sb_asm.S')
| -rw-r--r-- | sys/mips/sibyte/sb_asm.S | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sys/mips/sibyte/sb_asm.S b/sys/mips/sibyte/sb_asm.S index b81c067..19d00dd 100644 --- a/sys/mips/sibyte/sb_asm.S +++ b/sys/mips/sibyte/sb_asm.S @@ -27,6 +27,7 @@ */ #include <machine/asm.h> +#include <machine/cpuregs.h> /* * We compile a 32-bit kernel to run on the SB-1 processor which is a 64-bit @@ -80,3 +81,20 @@ LEAF(sb_store64) jr ra sd t0, 0(a0) END(sb_store64) + +#ifdef SMP +/* + * This function must be implemented in assembly because it is called early + * in AP boot without a valid stack. + * + * This cpu number is available in bits 25 to 27 of the coprocessor 0 PRID + * register. This is not documented in the BCM1250 user manual but can be + * gleaned from the CFE source code - see sb1250_altcpu.S + */ +LEAF(platform_processor_id) + mfc0 v0, MIPS_COP_0_PRID + srl v0, v0, 25 + jr ra + and v0, v0, 7 +END(platform_processor_id) +#endif /* SMP */ |
