3 * CP15 (system control) is the one that gets used the most in practice.
6 #include "../port/lib.h"
14 #define MAP2PCSPACE(va, pc) ((uintptr)(va) & ~KSEGM | (pc) & KSEGM)
17 /* alternates: 0xe12fff1e BX (R14); last e is R14 */
18 /* 0xe28ef000 B 0(R14); second e is R14 (ken) */
19 Retinst = 0xe1a0f00e, /* MOV R14, R15 */
23 cpwr(int cp, int op1, int crn, int crm, int op2, ulong val)
25 volatile ulong instr[2];
34 /* MCR. Rt will be R0. */
35 instr[0] = 0xee000010 |
36 op1 << 21 | crn << 16 | cp << 8 | op2 << 5 | crm;
39 pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&cp));
40 cachedwbse(pcaddr, sizeof instr);
43 fp = (void (*)(ulong))pcaddr;
49 cpwrsc(int op1, int crn, int crm, int op2, ulong val)
51 cpwr(CpSC, op1, crn, crm, op2, val);
55 cprd(int cp, int op1, int crn, int crm, int op2)
57 volatile ulong instr[2];
66 * MRC. return value will be in R0, which is convenient.
69 instr[0] = 0xee100010 |
70 op1 << 21 | crn << 16 | cp << 8 | op2 << 5 | crm;
73 pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&cp));
74 cachedwbse(pcaddr, sizeof instr);
77 fp = (ulong (*)(void))pcaddr;
82 cprdsc(int op1, int crn, int crm, int op2)
84 return cprd(CpSC, op1, crn, crm, op2);
92 volatile ulong instr[2];
98 * VMRS. return value will be in R0, which is convenient.
101 instr[0] = 0xeef00a10 | fpreg << 16 | 0 << 12;
105 pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&fpreg));
106 cachedwbse(pcaddr, sizeof instr);
109 fp = (ulong (*)(void))pcaddr;
114 fpwr(int fpreg, ulong val)
116 volatile ulong instr[2];
121 /* VMSR. Rt will be R0. */
122 instr[0] = 0xeee00a10 | fpreg << 16 | 0 << 12;
126 pcaddr = (void *)MAP2PCSPACE(instr, getcallerpc(&fpreg));
127 cachedwbse(pcaddr, sizeof instr);
130 fp = (void (*)(ulong))pcaddr;