1 files changed, 49 insertions, 16 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index da2f6c360f6b..34e3f3c45634 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -114,19 +114,19 @@ EXPORT_SYMBOL(elf_hwcap2);
 
 
 #ifdef MULTI_CPU
-struct processor processor __read_mostly;
+struct processor processor __ro_after_init;
 #endif
 #ifdef MULTI_TLB
-struct cpu_tlb_fns cpu_tlb __read_mostly;
+struct cpu_tlb_fns cpu_tlb __ro_after_init;
 #endif
 #ifdef MULTI_USER
-struct cpu_user_fns cpu_user __read_mostly;
+struct cpu_user_fns cpu_user __ro_after_init;
 #endif
 #ifdef MULTI_CACHE
-struct cpu_cache_fns cpu_cache __read_mostly;
+struct cpu_cache_fns cpu_cache __ro_after_init;
 #endif
 #ifdef CONFIG_OUTER_CACHE
-struct outer_cache_fns outer_cache __read_mostly;
+struct outer_cache_fns outer_cache __ro_after_init;
 EXPORT_SYMBOL(outer_cache);
 #endif
 
@@ -290,12 +290,9 @@ static int cpu_has_aliasing_icache(unsigned int arch)
 	/* arch specifies the register format */
 	switch (arch) {
 	case CPU_ARCH_ARMv7:
-		asm("mcr	p15, 2, %0, c0, c0, 0 @ set CSSELR"
-		    : /* No output operands */
-		    : "r" (1));
+		set_csselr(CSSELR_ICACHE | CSSELR_L1);
 		isb();
-		asm("mrc	p15, 1, %0, c0, c0, 0 @ read CCSIDR"
-		    : "=r" (id_reg));
+		id_reg = read_ccsidr();
 		line_size = 4 << ((id_reg & 0x7) + 2);
 		num_sets = ((id_reg >> 13) & 0x7fff) + 1;
 		aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
@@ -315,11 +312,12 @@ static void __init cacheid_init(void)
 {
 	unsigned int arch = cpu_architecture();
 
-	if (arch == CPU_ARCH_ARMv7M) {
-		cacheid = 0;
-	} else if (arch >= CPU_ARCH_ARMv6) {
+	if (arch >= CPU_ARCH_ARMv6) {
 		unsigned int cachetype = read_cpuid_cachetype();
-		if ((cachetype & (7 << 29)) == 4 << 29) {
+
+		if ((arch == CPU_ARCH_ARMv7M) && !cachetype) {
+			cacheid = 0;
+		} else if ((cachetype & (7 << 29)) == 4 << 29) {
 			/* ARMv7 register format */
 			arch = CPU_ARCH_ARMv7;
 			cacheid = CACHEID_VIPT_NONALIASING;
@@ -848,10 +846,29 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 	kernel_data.end     = virt_to_phys(_end - 1);
 
 	for_each_memblock(memory, region) {
+		phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+		phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+		unsigned long boot_alias_start;
+
+		/*
+		 * Some systems have a special memory alias which is only
+		 * used for booting.  We need to advertise this region to
+		 * kexec-tools so they know where bootable RAM is located.
+		 */
+		boot_alias_start = phys_to_idmap(start);
+		if (arm_has_idmap_alias() && boot_alias_start != IDMAP_INVALID_ADDR) {
+			res = memblock_virt_alloc(sizeof(*res), 0);
+			res->name = "System RAM (boot alias)";
+			res->start = boot_alias_start;
+			res->end = phys_to_idmap(end);
+			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+			request_resource(&iomem_resource, res);
+		}
+
 		res = memblock_virt_alloc(sizeof(*res), 0);
 		res->name  = "System RAM";
-		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
-		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+		res->start = start;
+		res->end = end;
 		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 
 		request_resource(&iomem_resource, res);
@@ -1000,9 +1017,25 @@ static void __init reserve_crashkernel(void)
 		(unsigned long)(crash_base >> 20),
 		(unsigned long)(total_mem >> 20));
 
+	/* The crashk resource must always be located in normal mem */
 	crashk_res.start = crash_base;
 	crashk_res.end = crash_base + crash_size - 1;
 	insert_resource(&iomem_resource, &crashk_res);
+
+	if (arm_has_idmap_alias()) {
+		/*
+		 * If we have a special RAM alias for use at boot, we
+		 * need to advertise to kexec tools where the alias is.
+		 */
+		static struct resource crashk_boot_res = {
+			.name = "Crash kernel (boot alias)",
+			.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
+		};
+
+		crashk_boot_res.start = phys_to_idmap(crash_base);
+		crashk_boot_res.end = crashk_boot_res.start + crash_size - 1;
+		insert_resource(&iomem_resource, &crashk_boot_res);
+	}
 }
 #else
 static inline void reserve_crashkernel(void) {}