ref: 7a145e89b301a1865661f7a6e60a21731f12824f
dir: /sys/src/9/kw/arm.s/
/* * sheevaplug machine assist, definitions * arm926ej-s processor at 1.2GHz * * loader uses R11 as scratch. */ #include "mem.h" #include "arm.h" #undef B /* B is for 'botch' */ #define PADDR(a) ((a) & ~KZERO) #define KADDR(a) (KZERO|(a)) #define L1X(va) (((((va))>>20) & 0x0fff)<<2) #define MACHADDR (L1-MACHSIZE) #define PTEDRAM (Dom0|L1AP(Krw)|Section|Cached|Buffered) #define PTEIO (Dom0|L1AP(Krw)|Section) /* wave at the user; clobbers R1 & R7; needs R12 (SB) set */ #define WAVE(c) \ ISB; \ MOVW $PHYSCONS, R7; \ MOVW $(c), R1; \ MOVW R1, (R7); \ ISB /* new instructions */ #define CLZ(s, d) WORD $(0xe16f0f10 | (d) << 12 | (s)) /* count leading 0s */ #define DMB \ MCR CpSC, 0, R0, C(CpCACHE), C(CpCACHEwb), CpCACHEdmbarr /* * data synchronisation barrier (formerly drain write buffer). * waits for cache flushes, eviction buffer drain, tlb flushes, * branch-prediction flushes, writes to memory; the lot. * on sheeva, also flushes L2 eviction buffer. * zeroes R0. */ #define DSB \ MOVW $0, R0; \ MCR CpSC, 0, R0, C(CpCACHE), C(CpCACHEwb), CpCACHEwait /* * prefetch flush; zeroes R0. * arm926ej-s manual says we need to sync with l2 cache in isb, * and uncached load is the easiest way. doesn't seem to matter. */ #define ISB \ MOVW $0, R0; \ MCR CpSC, 0, R0, C(CpCACHE), C(CpCACHEinvi), CpCACHEwait // MOVW (R0), R0; MOVW $0, R0 /* zeroes R0 */ #define BARRIERS ISB; DSB /* * invoked with PTE bits in R2, pa in R3, PTE pointed to by R4. * fill PTE pointed to by R4 and increment R4 past it. * increment R3 by a MB. clobbers R1. */ #define FILLPTE() \ ORR R3, R2, R1; /* pte bits in R2, pa in R3 */ \ MOVW R1, (R4); \ ADD $4, R4; /* bump PTE address */ \ ADD $MiB, R3; /* bump pa */ \ /* zero PTE pointed to by R4 and increment R4 past it. assumes R0 is 0. */ #define ZEROPTE() \ MOVW R0, (R4); \ ADD $4, R4; /* bump PTE address */