ref: 1b250fe1e459965861edff5868c7f1ca2b1f1ff9
dir: /lcache.s/
#include "mem.h" #include "io.h" /* l1 instruction cache invalidate */ TEXT l1icacheinv(SB), $-4 MOVW $0, R0 MCR 15, 0, R0, C7, C5, 0 ISB RET /* l1 data cache writeback */ TEXT l1dcachewb(SB), $-4 MOVW $cacheopwb(SB), R0 MOVW $0, R1 B cacheop(SB) /* l1 data cache invalidate */ TEXT l1dcacheinv(SB), $-4 MOVW $cacheopinv(SB), R0 MOVW $0, R1 B cacheop(SB) /* l1 data cache writeback + invalidate */ TEXT l1dcachewbinv(SB), $-4 MOVW $cacheopwbinv(SB), R0 MOVW $0, R1 B cacheop(SB) /* l1 unified instruction + data cache writeback + invalidate */ TEXT l1ucachewbinv(SB), $-4 /* stash and splhi */ MOVW CPSR, R0 MOVM.DB.W [R0], (SP) MOVM.DB.W [R14], (SP) CPSID /* go */ BL l1dcachewbinv(SB) BL l1icacheinv(SB) /* restore and splx */ MOVM.IA.W (SP), [R14] MOVM.IA.W (SP), [R0] MOVW R0, CPSR RET /* l2 instruction + data cache writeback */ TEXT l2idcachewb(SB), $-4 MOVW $cacheopwb(SB), R0 MOVW $1, R1 B cacheop(SB) /* l2 instruction + data cache invalidate */ TEXT l2idcacheinv(SB), $-4 MOVW $cacheopinv(SB), R0 MOVW $1, R1 B cacheop(SB) /* l2 instruction + data cache writeback + invalidate */ TEXT l2idcachewbinv(SB), $-4 MOVW $cacheopwbinv(SB), R0 MOVW $1, R1 B cacheop(SB) /* l1 unified instruction + data cache writeback + invalidate */ TEXT l2ucachewbinv(SB), $-4 /* stash and splhi */ MOVW CPSR, R0 MOVM.DB.W [R0], (SP) MOVM.DB.W [R14], (SP) CPSID BL l2idcachewbinv(SB) BL l2idcacheinv(SB) /* restore and splx */ MOVM.IA.W (SP), [R14] MOVM.IA.W (SP), [R0] MOVW R0, CPSR RET /* set/way operations for cacheop */ TEXT cacheopwb(SB), $-4; MCR 15, 0, R0, C7, C10, 2; RET TEXT cacheopinv(SB), $-4; MCR 15, 0, R0, C7, C6, 2; RET TEXT cacheopwbinv(SB), $-4; MCR 15, 0, R0, C7, C14, 2; RET #define Rop R2 #define Rcache R3 #define Rways R4 #define Rwayshift R5 #define Rsets R6 #define Rsetshift R7 #define Rset R8 /* apply a cache operation to the whole cache */ TEXT cacheop(SB), $-4 /* stash and splhi */ MOVW CPSR, R2 MOVM.DB.W [R2,R14], (SP) MOVW R0, Rop MOVW R1, Rcache CPSID /* get cache geometry */ MCR 15, 2, Rcache, C0, C0, 0; ISB MRC 15, 1, R0, C0, C0, 0 /* compute ways = ((R0 >> 3) & 0x3ff) + 1) */ SRA $3, R0, Rways AND $0x3ff, Rways ADD $1, Rways /* compute wayshift = log₂(ways) */ CLZ(4, 5) /* Rways, Rwayshift */ ADD $1, Rwayshift /* compute sets = ((R0 >> 13) & 0x7fff) + 1) */ SRA $13, R0, Rsets AND $0x7fff, Rsets ADD $1, Rsets /* compute setshift = log₂(cache line size) */ AND $0x7, R0, Rsetshift ADD $4, Rsetshift cacheopways: MOVW Rsets, Rset cacheopsets: /* compute set / way register contents */ SLL Rwayshift, Rways, R0 SLL Rsetshift, Rset, R1 ORR R1, R0 SLL $1, Rcache, R1 ORR R1, R0 BL (Rop) SUB $1, Rset; CMP $0, Rset; BEQ cacheopsets /* loop sets */ SUB $1, Rways; CMP $0, Rways; BEQ cacheopways /* loop ways */ /* restore regs and splx */ MOVM.IA.W (SP), [R2,R14] MOVW R2, CPSR RET