Here is what HID5 looks like in Qemu's source code:
#if defined(TARGET_PPC64)
#if defined(CONFIG_USER_ONLY)
#define POWERPC970_HID5_INIT 0x00000080
#else
#define POWERPC970_HID5_INIT 0x00000000
#endif
static void gen_spr_970_hid(CPUPPCState *env)
{
/* Hardware implementation registers */
/* XXX : not implemented */
spr_register(env, SPR_HID0, "HID0",
SPR_NOACCESS, SPR_NOACCESS,
&spr_read_generic, &spr_write_clear,
0x60000000);
spr_register(env, SPR_HID1, "HID1",
SPR_NOACCESS, SPR_NOACCESS,
&spr_read_generic, &spr_write_generic,
0x00000000);
spr_register(env, SPR_970_HID5, "HID5",
SPR_NOACCESS, SPR_NOACCESS,
&spr_read_generic, &spr_write_generic,
POWERPC970_HID5_INIT);
}
#define S_HID5 1013
void helper_dcbz(CPUPPCState *env, target_ulong addr, uint32_t opcode)
{
target_ulong mask, dcbz_size = env->dcache_line_size;
uint32_t i;
void *haddr;
#if defined(TARGET_PPC64)
/* Check for dcbz vs dcbzl on 970 */
if (env->excp_model == POWERPC_EXCP_970 &&
!(opcode & 0x00200000) && ((env->spr[SPR_970_HID5] >> 7) & 0x3) == 1) {
dcbz_size = 32;
}
#endif
/* Align address */
mask = ~(dcbz_size - 1);
addr &= mask;
/* Check reservation */
if ((env->reserve_addr & mask) == (addr & mask)) {
env->reserve_addr = (target_ulong)-1ULL;
}
#define SPR_970_HID5 (0x3F6)