Differential D25237 Diff 74756 sys/powerpc/powernv/platform_powernv.c

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sys/powerpc/powernv/platform_powernv.c

Show First 20 Lines • Show All 136 Lines • ▼ Show 20 Lines	powernv_attach(platform_t plat)
int32_t lp_size, lp_encoding;		int32_t lp_size, lp_encoding;
char buf[255];		char buf[255];
pcell_t refpoints[3];		pcell_t refpoints[3];
pcell_t prop;		pcell_t prop;
phandle_t cpu;		phandle_t cpu;
phandle_t opal;		phandle_t opal;
int res, len, idx;		int res, len, idx;
register_t msr;		register_t msr;
		bool has_lp;

/* Ping OPAL again just to make sure */		/* Ping OPAL again just to make sure */
opal_check();		opal_check();

#if BYTE_ORDER == LITTLE_ENDIAN		#if BYTE_ORDER == LITTLE_ENDIAN
opal_call(OPAL_REINIT_CPUS, 2 /* Little endian */);		opal_call(OPAL_REINIT_CPUS, 2 /* Little endian */);
#else		#else
opal_call(OPAL_REINIT_CPUS, 1 /* Big endian */);		opal_call(OPAL_REINIT_CPUS, 1 /* Big endian */);
▲ Show 20 Lines • Show All 67 Lines • ▼ Show 20 Lines	if (len > 0) {
* We have to use a variable length array on the stack		* We have to use a variable length array on the stack
* since we have very limited stack space.		* since we have very limited stack space.
*/		*/
pcell_t arr[len/sizeof(cell_t)];		pcell_t arr[len/sizeof(cell_t)];
res = OF_getencprop(cpu, "ibm,segment-page-sizes", arr,		res = OF_getencprop(cpu, "ibm,segment-page-sizes", arr,
sizeof(arr));		sizeof(arr));
len /= 4;		len /= 4;
idx = 0;		idx = 0;
		has_lp = false;
while (len > 0) {		while (len > 0) {
shift = arr[idx];		shift = arr[idx];
slb_encoding = arr[idx + 1];		slb_encoding = arr[idx + 1];
nptlp = arr[idx + 2];		nptlp = arr[idx + 2];
idx += 3;		idx += 3;
len -= 3;		len -= 3;
while (len > 0 && nptlp) {		while (len > 0 && nptlp) {
lp_size = arr[idx];		lp_size = arr[idx];
lp_encoding = arr[idx+1];		lp_encoding = arr[idx+1];
if (slb_encoding == SLBV_L && lp_encoding == 0)		if (slb_encoding == SLBV_L && lp_encoding == 0)
break;		has_lp = true;

		if (slb_encoding == SLB_PGSZ_4K_4K &&
		lp_encoding == LP_4K_16M)
		moea64_has_lp_4k_16m = true;

idx += 2;		idx += 2;
len -= 2;		len -= 2;
nptlp--;		nptlp--;
}		}
if (nptlp && slb_encoding == SLBV_L && lp_encoding == 0)		if (has_lp && moea64_has_lp_4k_16m)
break;		break;
}		}

if (len == 0)		if (!has_lp)
panic("Standard large pages (SLB[L] = 1, PTE[LP] = 0) "		panic("Standard large pages (SLB[L] = 1, PTE[LP] = 0) "
"not supported by this system.");		"not supported by this system.");

moea64_large_page_shift = shift;		moea64_large_page_shift = shift;
moea64_large_page_size = 1ULL << lp_size;		moea64_large_page_size = 1ULL << lp_size;
}		}

out:		out:
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