#endif
#define PROT_PTE_DEVICE L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_WRITE
-#define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_XN|PMD_SECT_AP_WRITE
+#define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_AP_WRITE
static struct mem_type mem_types[] = {
[MT_DEVICE] = { /* Strongly ordered / ARMv6 shared device */
.prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED |
L_PTE_SHARED,
.prot_l1 = PMD_TYPE_TABLE,
- .prot_sect = PROT_SECT_DEVICE | PMD_SECT_UNCACHED,
+ .prot_sect = PROT_SECT_DEVICE | PMD_SECT_S,
.domain = DOMAIN_IO,
},
[MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
.prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_NONSHARED,
.prot_l1 = PMD_TYPE_TABLE,
- .prot_sect = PROT_SECT_DEVICE | PMD_SECT_TEX(2),
+ .prot_sect = PROT_SECT_DEVICE,
.domain = DOMAIN_IO,
},
[MT_DEVICE_CACHED] = { /* ioremap_cached */
[MT_DEVICE_WC] = { /* ioremap_wc */
.prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_WC,
.prot_l1 = PMD_TYPE_TABLE,
- .prot_sect = PROT_SECT_DEVICE | PMD_SECT_BUFFERABLE,
+ .prot_sect = PROT_SECT_DEVICE,
.domain = DOMAIN_IO,
},
[MT_CACHECLEAN] = {
#endif
/*
- * On non-Xscale3 ARMv5-and-older systems, use CB=01
- * (Uncached/Buffered) for ioremap_wc() mappings. On XScale3
- * and ARMv6+, use TEXCB=00100 mappings (Inner/Outer Uncacheable
- * in xsc3 parlance, Uncached Normal in ARMv6 parlance).
+ * Strip out features not present on earlier architectures.
+ * Pre-ARMv5 CPUs don't have TEX bits. Pre-ARMv6 CPUs or those
+ * without extended page tables don't have the 'Shared' bit.
*/
- if (cpu_is_xsc3() || cpu_arch >= CPU_ARCH_ARMv6) {
- mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
- mem_types[MT_DEVICE_WC].prot_sect &= ~PMD_SECT_BUFFERABLE;
- }
+ if (cpu_arch < CPU_ARCH_ARMv5)
+ for (i = 0; i < ARRAY_SIZE(mem_types); i++)
+ mem_types[i].prot_sect &= ~PMD_SECT_TEX(7);
+ if ((cpu_arch < CPU_ARCH_ARMv6 || !(cr & CR_XP)) && !cpu_is_xsc3())
+ for (i = 0; i < ARRAY_SIZE(mem_types); i++)
+ mem_types[i].prot_sect &= ~PMD_SECT_S;
/*
- * ARMv5 and lower, bit 4 must be set for page tables.
- * (was: cache "update-able on write" bit on ARM610)
- * However, Xscale cores require this bit to be cleared.
+ * ARMv5 and lower, bit 4 must be set for page tables (was: cache
+ * "update-able on write" bit on ARM610). However, Xscale and
+ * Xscale3 require this bit to be cleared.
*/
- if (cpu_is_xscale()) {
+ if (cpu_is_xscale() || cpu_is_xsc3()) {
for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
mem_types[i].prot_sect &= ~PMD_BIT4;
mem_types[i].prot_l1 &= ~PMD_BIT4;
}
}
+ /*
+ * Mark the device areas according to the CPU/architecture.
+ */
+ if (cpu_is_xsc3() || (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP))) {
+ if (!cpu_is_xsc3()) {
+ /*
+ * Mark device regions on ARMv6+ as execute-never
+ * to prevent speculative instruction fetches.
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_XN;
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_XN;
+ mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_XN;
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_XN;
+ }
+ if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
+ /*
+ * For ARMv7 with TEX remapping,
+ * - shared device is SXCB=1100
+ * - nonshared device is SXCB=0100
+ * - write combine device mem is SXCB=0001
+ * (Uncached Normal memory)
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1);
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(1);
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+ } else if (cpu_is_xsc3()) {
+ /*
+ * For Xscale3,
+ * - shared device is TEXCB=00101
+ * - nonshared device is TEXCB=01000
+ * - write combine device mem is TEXCB=00100
+ * (Inner/Outer Uncacheable in xsc3 parlance)
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1) | PMD_SECT_BUFFERED;
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
+ } else {
+ /*
+ * For ARMv6 and ARMv7 without TEX remapping,
+ * - shared device is TEXCB=00001
+ * - nonshared device is TEXCB=01000
+ * - write combine device mem is TEXCB=00100
+ * (Uncached Normal in ARMv6 parlance).
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
+ }
+ } else {
+ /*
+ * On others, write combining is "Uncached/Buffered"
+ */
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+ }
+
+ /*
+ * Now deal with the memory-type mappings
+ */
cp = &cache_policies[cachepolicy];
vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
* Enable CPU-specific coherency if supported.
* (Only available on XSC3 at the moment.)
*/
- if (arch_is_coherent()) {
- if (cpu_is_xsc3()) {
- mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
- mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
- }
- }
+ if (arch_is_coherent() && cpu_is_xsc3())
+ mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
/*
* ARMv6 and above have extended page tables.
mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
- /*
- * Mark the device area as "shared device"
- */
- mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
-
#ifdef CONFIG_SMP
/*
* Mark memory with the "shared" attribute for SMP systems
mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot;
mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot;
- if (cpu_arch < CPU_ARCH_ARMv5)
- mem_types[MT_MINICLEAN].prot_sect &= ~PMD_SECT_TEX(1);
-
pgprot_user = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | user_pgprot);
pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG |
L_PTE_DIRTY | L_PTE_WRITE |
projects / linux-2.6-omap-h63xx.git / blobdiff