aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mm
diff options
context:
space:
mode:
authorRussell King <rmk+kernel@arm.linux.org.uk>2010-10-19 17:06:36 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-10-19 17:06:36 -0400
commit809b4e00baf006a990a73329ba381d536c6fa277 (patch)
treee949e0efd019d6f932537aba762792b07a84351c /arch/arm/mm
parenta0a55682b83fd5f012afadcf415b030d7424ae68 (diff)
parent79a94c3538bda6869d7bb150b5e02dd3a72314dd (diff)
Merge branch 'devel-stable' into devel
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/ioremap.c8
-rw-r--r--arch/arm/mm/mmap.c22
-rw-r--r--arch/arm/mm/mmu.c4
-rw-r--r--arch/arm/mm/proc-v7.S10
4 files changed, 39 insertions, 5 deletions
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index ab506272b2d3..17e7b0b57e49 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -204,8 +204,12 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
204 /* 204 /*
205 * Don't allow RAM to be mapped - this causes problems with ARMv6+ 205 * Don't allow RAM to be mapped - this causes problems with ARMv6+
206 */ 206 */
207 if (WARN_ON(pfn_valid(pfn))) 207 if (pfn_valid(pfn)) {
208 return NULL; 208 printk(KERN_WARNING "BUG: Your driver calls ioremap() on system memory. This leads\n"
209 KERN_WARNING "to architecturally unpredictable behaviour on ARMv6+, and ioremap()\n"
210 KERN_WARNING "will fail in the next kernel release. Please fix your driver.\n");
211 WARN_ON(1);
212 }
209 213
210 type = get_mem_type(mtype); 214 type = get_mem_type(mtype);
211 if (!type) 215 if (!type)
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index 4f5b39687df5..b0a98305055c 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -144,3 +144,25 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
144{ 144{
145 return !(pfn + (size >> PAGE_SHIFT) > 0x00100000); 145 return !(pfn + (size >> PAGE_SHIFT) > 0x00100000);
146} 146}
147
148#ifdef CONFIG_STRICT_DEVMEM
149
150#include <linux/ioport.h>
151
152/*
153 * devmem_is_allowed() checks to see if /dev/mem access to a certain
154 * address is valid. The argument is a physical page number.
155 * We mimic x86 here by disallowing access to system RAM as well as
156 * device-exclusive MMIO regions. This effectively disable read()/write()
157 * on /dev/mem.
158 */
159int devmem_is_allowed(unsigned long pfn)
160{
161 if (iomem_is_exclusive(pfn << PAGE_SHIFT))
162 return 0;
163 if (!page_is_ram(pfn))
164 return 1;
165 return 0;
166}
167
168#endif
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e2335811c02e..c32f731d56d3 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -248,7 +248,7 @@ static struct mem_type mem_types[] = {
248 }, 248 },
249 [MT_MEMORY] = { 249 [MT_MEMORY] = {
250 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | 250 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
251 L_PTE_USER | L_PTE_EXEC, 251 L_PTE_WRITE | L_PTE_EXEC,
252 .prot_l1 = PMD_TYPE_TABLE, 252 .prot_l1 = PMD_TYPE_TABLE,
253 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE, 253 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
254 .domain = DOMAIN_KERNEL, 254 .domain = DOMAIN_KERNEL,
@@ -259,7 +259,7 @@ static struct mem_type mem_types[] = {
259 }, 259 },
260 [MT_MEMORY_NONCACHED] = { 260 [MT_MEMORY_NONCACHED] = {
261 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | 261 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
262 L_PTE_USER | L_PTE_EXEC | L_PTE_MT_BUFFERABLE, 262 L_PTE_WRITE | L_PTE_EXEC | L_PTE_MT_BUFFERABLE,
263 .prot_l1 = PMD_TYPE_TABLE, 263 .prot_l1 = PMD_TYPE_TABLE,
264 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE, 264 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
265 .domain = DOMAIN_KERNEL, 265 .domain = DOMAIN_KERNEL,
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 055e9d50d015..53cbe2225153 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -253,6 +253,14 @@ __v7_setup:
253 orreq r10, r10, #1 << 22 @ set bit #22 253 orreq r10, r10, #1 << 22 @ set bit #22
254 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register 254 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
255#endif 255#endif
256#ifdef CONFIG_ARM_ERRATA_743622
257 teq r6, #0x20 @ present in r2p0
258 teqne r6, #0x21 @ present in r2p1
259 teqne r6, #0x22 @ present in r2p2
260 mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register
261 orreq r10, r10, #1 << 6 @ set bit #6
262 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register
263#endif
256 264
2573: mov r10, #0 2653: mov r10, #0
258#ifdef HARVARD_CACHE 266#ifdef HARVARD_CACHE
@@ -376,7 +384,7 @@ __v7_ca9mp_proc_info:
376 b __v7_ca9mp_setup 384 b __v7_ca9mp_setup
377 .long cpu_arch_name 385 .long cpu_arch_name
378 .long cpu_elf_name 386 .long cpu_elf_name
379 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP 387 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS
380 .long cpu_v7_name 388 .long cpu_v7_name
381 .long v7_processor_functions 389 .long v7_processor_functions
382 .long v7wbi_tlb_fns 390 .long v7wbi_tlb_fns