/*
* Tentatively read an 8, 16, or 32-bit value from 'addr'.
* If the read succeeds, the value is written to 'rptr' and zero is returned.
* Else, return EFAULT.
*/
int
badaddr_read(void *addr, size_t size, void *rptr)
{
extern int badaddr_read_1(const uint8_t *, uint8_t *);
extern int badaddr_read_2(const uint16_t *, uint16_t *);
extern int badaddr_read_4(const uint32_t *, uint32_t *);
union {
uint8_t v1;
uint16_t v2;
uint32_t v4;
} u;
int rv, s;
cpu_drain_writebuf();
s = splhigh();
/* Read from the test address. */
switch (size) {
case sizeof(uint8_t):
rv = badaddr_read_1(addr, &u.v1);
if (rv == 0 && rptr)
*(uint8_t *) rptr = u.v1;
break;
case sizeof(uint16_t):
rv = badaddr_read_2(addr, &u.v2);
if (rv == 0 && rptr)
*(uint16_t *) rptr = u.v2;
break;
case sizeof(uint32_t):
rv = badaddr_read_4(addr, &u.v4);
if (rv == 0 && rptr)
*(uint32_t *) rptr = u.v4;
break;
default:
panic("%s: invalid size (%zu)", __func__, size);
}
splx(s);
/* Return EFAULT if the address was invalid, else zero */
return (rv);
}
/*
* Tentatively read an 8, 16, or 32-bit value from 'addr'.
* If the read succeeds, the value is written to 'rptr' and zero is returned.
* Else, return EFAULT.
*/
int
badaddr_read(void *addr, size_t size, void *rptr)
{
union {
uint8_t v1;
uint16_t v2;
uint32_t v4;
} u;
int rv;
cpu_drain_writebuf();
/* Read from the test address. */
switch (size) {
case sizeof(uint8_t):
rv = badaddr_read_1(addr, &u.v1);
if (rv == 0 && rptr)
*(uint8_t *) rptr = u.v1;
break;
case sizeof(uint16_t):
rv = badaddr_read_2(addr, &u.v2);
if (rv == 0 && rptr)
*(uint16_t *) rptr = u.v2;
break;
case sizeof(uint32_t):
rv = badaddr_read_4(addr, &u.v4);
if (rv == 0 && rptr)
*(uint32_t *) rptr = u.v4;
break;
default:
panic("badaddr: invalid size (%lu)", (u_long) size);
}
/* Return EFAULT if the address was invalid, else zero */
return (rv);
}
