ref: 023f5eca58471db968aee3de7729c1c9b0540952
dir: /sys/src/9/omap/coproc.c/
/* * arm co-processors * CP15 (system control) is the one that gets used the most in practice. */ #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "arm.h" #define MAP2PCSPACE(va, pc) ((uintptr)(va) & ~KSEGM | (pc) & KSEGM) enum { /* alternates: 0xe12fff1e BX (R14); last e is R14 */ /* 0xe28ef000 B 0(R14); second e is R14 (ken) */ Retinst = 0xe1a0f00e, /* MOV R14, R15 */ }; void cpwr(int cp, int op1, int crn, int crm, int op2, ulong val) { volatile ulong instr[2]; void *pcaddr; void (*fp)(ulong); op1 &= 7; op2 &= 7; crn &= 017; crm &= 017; cp &= 017; /* MCR. Rt will be R0. */ instr[0] = 0xee000010 | op1 << 21 | crn << 16 | cp << 8 | op2 << 5 | crm; instr[1] = Retinst; pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&cp)); cachedwbse(pcaddr, sizeof instr); cacheiinv(); fp = (void (*)(ulong))pcaddr; (*fp)(val); coherence(); } void cpwrsc(int op1, int crn, int crm, int op2, ulong val) { cpwr(CpSC, op1, crn, crm, op2, val); } ulong cprd(int cp, int op1, int crn, int crm, int op2) { volatile ulong instr[2]; void *pcaddr; ulong (*fp)(void); op1 &= 7; op2 &= 7; crn &= 017; crm &= 017; /* * MRC. return value will be in R0, which is convenient. * Rt will be R0. */ instr[0] = 0xee100010 | op1 << 21 | crn << 16 | cp << 8 | op2 << 5 | crm; instr[1] = Retinst; pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&cp)); cachedwbse(pcaddr, sizeof instr); cacheiinv(); fp = (ulong (*)(void))pcaddr; return (*fp)(); } ulong cprdsc(int op1, int crn, int crm, int op2) { return cprd(CpSC, op1, crn, crm, op2); } /* floating point */ ulong fprd(int fpreg) { volatile ulong instr[2]; void *pcaddr; ulong (*fp)(void); fpreg &= 017; /* * VMRS. return value will be in R0, which is convenient. * Rt will be R0. */ instr[0] = 0xeef00a10 | fpreg << 16 | 0 << 12; instr[1] = Retinst; coherence(); pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&fpreg)); cachedwbse(pcaddr, sizeof instr); cacheiinv(); fp = (ulong (*)(void))pcaddr; return (*fp)(); } void fpwr(int fpreg, ulong val) { volatile ulong instr[2]; void *pcaddr; void (*fp)(ulong); fpreg &= 017; /* VMSR. Rt will be R0. */ instr[0] = 0xeee00a10 | fpreg << 16 | 0 << 12; instr[1] = Retinst; coherence(); pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&fpreg)); cachedwbse(pcaddr, sizeof instr); cacheiinv(); fp = (void (*)(ulong))pcaddr; (*fp)(val); coherence(); }