Merge tag 'xtensa-next-20140503' of git://github.com/czankel/xtensa-linux

Pull Xtensa fixes from Chris Zankel:
 - Fixes allmodconfig, allnoconfig builds
 - Adds highmem support
 - Enables build-time exception table sorting.

* tag 'xtensa-next-20140503' of git://github.com/czankel/xtensa-linux:
  xtensa: ISS: don't depend on CONFIG_TTY
  xtensa: xt2000: drop redundant sysmem initialization
  xtensa: add support for KC705
  xtensa: xtfpga: introduce SoC I/O bus
  xtensa: add HIGHMEM support
  xtensa: optimize local_flush_tlb_kernel_range
  xtensa: dump sysmem from the bootmem_init
  xtensa: handle memmap kernel option
  xtensa: keep sysmem banks ordered in mem_reserve
  xtensa: keep sysmem banks ordered in add_sysmem_bank
  xtensa: split bootparam and kernel meminfo
  xtensa: enable sorting extable at build time
  xtensa: export __{invalidate,flush}_dcache_range
  xtensa: Export __invalidate_icache_range

23 files changed, 691 insertions, 167 deletions

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 02d6d29a63c1..3a617af60d46 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -14,6 +14,7 @@ config XTENSA
         select GENERIC_PCI_IOMAP
         select ARCH_WANT_IPC_PARSE_VERSION
         select ARCH_WANT_OPTIONAL_GPIOLIB
+        select BUILDTIME_EXTABLE_SORT
         select CLONE_BACKWARDS
         select IRQ_DOMAIN
         select HAVE_OPROFILE
@@ -189,6 +190,24 @@ config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 
           If in doubt, say Y.
 
+config HIGHMEM
+        bool "High Memory Support"
+        help
+          Linux can use the full amount of RAM in the system by
+          default. However, the default MMUv2 setup only maps the
+          lowermost 128 MB of memory linearly to the areas starting
+          at 0xd0000000 (cached) and 0xd8000000 (uncached).
+          When there are more than 128 MB memory in the system not
+          all of it can be "permanently mapped" by the kernel.
+          The physical memory that's not permanently mapped is called
+          "high memory".
+
+          If you are compiling a kernel which will never run on a
+          machine with more than 128 MB total physical RAM, answer
+          N here.
+
+          If unsure, say Y.
+
 endmenu
 
 config XTENSA_CALIBRATE_CCOUNT
@@ -224,7 +243,6 @@ choice
 
 config XTENSA_PLATFORM_ISS
         bool "ISS"
-        depends on TTY
         select XTENSA_CALIBRATE_CCOUNT
         select SERIAL_CONSOLE
         help
diff --git a/arch/xtensa/boot/dts/kc705.dts b/arch/xtensa/boot/dts/kc705.dts
new file mode 100644
index 000000000000..742a347be67a
--- /dev/null
+++ b/arch/xtensa/boot/dts/kc705.dts
@@ -0,0 +1,11 @@
+/dts-v1/;
+/include/ "xtfpga.dtsi"
+/include/ "xtfpga-flash-128m.dtsi"
+
+/ {
+        compatible = "cdns,xtensa-kc705";
+        memory@0 {
+                device_type = "memory";
+                reg = <0x00000000 0x08000000>;
+        };
+};
diff --git a/arch/xtensa/boot/dts/xtfpga-flash-128m.dtsi b/arch/xtensa/boot/dts/xtfpga-flash-128m.dtsi
new file mode 100644
index 000000000000..d3a88e029873
--- /dev/null
+++ b/arch/xtensa/boot/dts/xtfpga-flash-128m.dtsi
@@ -0,0 +1,28 @@
+/ {
+        soc {
+                flash: flash@00000000 {
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        compatible = "cfi-flash";
+                        reg = <0x00000000 0x08000000>;
+                        bank-width = <2>;
+                        device-width = <2>;
+                        partition@0x0 {
+                                label = "data";
+                                reg = <0x00000000 0x06000000>;
+                        };
+                        partition@0x6000000 {
+                                label = "boot loader area";
+                                reg = <0x06000000 0x00800000>;
+                        };
+                        partition@0x6800000 {
+                                label = "kernel image";
+                                reg = <0x06800000 0x017e0000>;
+                        };
+                        partition@0x7fe0000 {
+                                label = "boot environment";
+                                reg = <0x07fe0000 0x00020000>;
+                        };
+                };
+        };
+};
diff --git a/arch/xtensa/boot/dts/xtfpga-flash-16m.dtsi b/arch/xtensa/boot/dts/xtfpga-flash-16m.dtsi
index e5703c7beeb6..1d97203c18e7 100644
--- a/arch/xtensa/boot/dts/xtfpga-flash-16m.dtsi
+++ b/arch/xtensa/boot/dts/xtfpga-flash-16m.dtsi
@@ -1,26 +1,28 @@
 / {
-        flash: flash@f8000000 {
-                #address-cells = <1>;
-                #size-cells = <1>;
-                compatible = "cfi-flash";
-                reg = <0xf8000000 0x01000000>;
-                bank-width = <2>;
-                device-width = <2>;
-                partition@0x0 {
-                        label = "boot loader area";
-                        reg = <0x00000000 0x00400000>;
+        soc {
+                flash: flash@08000000 {
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        compatible = "cfi-flash";
+                        reg = <0x08000000 0x01000000>;
+                        bank-width = <2>;
+                        device-width = <2>;
+                        partition@0x0 {
+                                label = "boot loader area";
+                                reg = <0x00000000 0x00400000>;
+                        };
+                        partition@0x400000 {
+                                label = "kernel image";
+                                reg = <0x00400000 0x00600000>;
+                        };
+                        partition@0xa00000 {
+                                label = "data";
+                                reg = <0x00a00000 0x005e0000>;
+                        };
+                        partition@0xfe0000 {
+                                label = "boot environment";
+                                reg = <0x00fe0000 0x00020000>;
+                        };
                 };
-                partition@0x400000 {
-                        label = "kernel image";
-                        reg = <0x00400000 0x00600000>;
-                };
-                partition@0xa00000 {
-                        label = "data";
-                        reg = <0x00a00000 0x005e0000>;
-                };
-                partition@0xfe0000 {
-                        label = "boot environment";
-                        reg = <0x00fe0000 0x00020000>;
-                };
-        };
+        };
 };
diff --git a/arch/xtensa/boot/dts/xtfpga-flash-4m.dtsi b/arch/xtensa/boot/dts/xtfpga-flash-4m.dtsi
index 6f9c10d6b689..d1c621ca8be1 100644
--- a/arch/xtensa/boot/dts/xtfpga-flash-4m.dtsi
+++ b/arch/xtensa/boot/dts/xtfpga-flash-4m.dtsi
@@ -1,18 +1,20 @@
 / {
-        flash: flash@f8000000 {
-                #address-cells = <1>;
-                #size-cells = <1>;
-                compatible = "cfi-flash";
-                reg = <0xf8000000 0x00400000>;
-                bank-width = <2>;
-                device-width = <2>;
-                partition@0x0 {
-                        label = "boot loader area";
-                        reg = <0x00000000 0x003f0000>;
+        soc {
+                flash: flash@08000000 {
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        compatible = "cfi-flash";
+                        reg = <0x08000000 0x00400000>;
+                        bank-width = <2>;
+                        device-width = <2>;
+                        partition@0x0 {
+                                label = "boot loader area";
+                                reg = <0x00000000 0x003f0000>;
+                        };
+                        partition@0x3f0000 {
+                                label = "boot environment";
+                                reg = <0x003f0000 0x00010000>;
+                        };
                 };
-                partition@0x3f0000 {
-                        label = "boot environment";
-                        reg = <0x003f0000 0x00010000>;
-                };
-        };
+        };
 };
diff --git a/arch/xtensa/boot/dts/xtfpga.dtsi b/arch/xtensa/boot/dts/xtfpga.dtsi
index e7370b11348e..dec9178840f6 100644
--- a/arch/xtensa/boot/dts/xtfpga.dtsi
+++ b/arch/xtensa/boot/dts/xtfpga.dtsi
@@ -42,21 +42,28 @@
                 };
         };
 
-        serial0: serial@fd050020 {
-                device_type = "serial";
-                compatible = "ns16550a";
-                no-loopback-test;
-                reg = <0xfd050020 0x20>;
-                reg-shift = <2>;
-                interrupts = <0 1>; /* external irq 0 */
-                clocks = <&osc>;
-        };
+        soc {
+                #address-cells = <1>;
+                #size-cells = <1>;
+                compatible = "simple-bus";
+                ranges = <0x00000000 0xf0000000 0x10000000>;
 
-        enet0: ethoc@fd030000 {
-                compatible = "opencores,ethoc";
-                reg = <0xfd030000 0x4000 0xfd800000 0x4000>;
-                interrupts = <1 1>; /* external irq 1 */
-                local-mac-address = [00 50 c2 13 6f 00];
-                clocks = <&osc>;
+                serial0: serial@0d050020 {
+                        device_type = "serial";
+                        compatible = "ns16550a";
+                        no-loopback-test;
+                        reg = <0x0d050020 0x20>;
+                        reg-shift = <2>;
+                        interrupts = <0 1>; /* external irq 0 */
+                        clocks = <&osc>;
+                };
+
+                enet0: ethoc@0d030000 {
+                        compatible = "opencores,ethoc";
+                        reg = <0x0d030000 0x4000 0x0d800000 0x4000>;
+                        interrupts = <1 1>; /* external irq 1 */
+                        local-mac-address = [00 50 c2 13 6f 00];
+                        clocks = <&osc>;
+                };
         };
 };
diff --git a/arch/xtensa/include/asm/bootparam.h b/arch/xtensa/include/asm/bootparam.h
index 23392c5630ce..892aab399ac8 100644
--- a/arch/xtensa/include/asm/bootparam.h
+++ b/arch/xtensa/include/asm/bootparam.h
@@ -37,23 +37,14 @@ typedef struct bp_tag {
         unsigned long data[0];  /* data */
 } bp_tag_t;
 
-typedef struct meminfo {
+struct bp_meminfo {
         unsigned long type;
         unsigned long start;
         unsigned long end;
-} meminfo_t;
-
-#define SYSMEM_BANKS_MAX 5
+};
 
 #define MEMORY_TYPE_CONVENTIONAL        0x1000
 #define MEMORY_TYPE_NONE                0x2000
 
-typedef struct sysmem_info {
-        int nr_banks;
-        meminfo_t bank[SYSMEM_BANKS_MAX];
-} sysmem_info_t;
-
-extern sysmem_info_t sysmem;
-
 #endif
 #endif
diff --git a/arch/xtensa/include/asm/fixmap.h b/arch/xtensa/include/asm/fixmap.h
new file mode 100644
index 000000000000..9f6c33d0428a
--- /dev/null
+++ b/arch/xtensa/include/asm/fixmap.h
@@ -0,0 +1,58 @@
+/*
+ * fixmap.h: compile-time virtual memory allocation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1998 Ingo Molnar
+ *
+ * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
+ */
+
+#ifndef _ASM_FIXMAP_H
+#define _ASM_FIXMAP_H
+
+#include <asm/pgtable.h>
+#ifdef CONFIG_HIGHMEM
+#include <linux/threads.h>
+#include <asm/kmap_types.h>
+#endif
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process. We allocate these special  addresses
+ * from the end of the consistent memory region backwards.
+ * Also this lets us do fail-safe vmalloc(), we
+ * can guarantee that these special addresses and
+ * vmalloc()-ed addresses never overlap.
+ *
+ * these 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages. (or larger if used with an increment
+ * higher than 1) use fixmap_set(idx,phys) to associate
+ * physical memory with fixmap indices.
+ */
+enum fixed_addresses {
+#ifdef CONFIG_HIGHMEM
+        /* reserved pte's for temporary kernel mappings */
+        FIX_KMAP_BEGIN,
+        FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
+#endif
+        __end_of_fixed_addresses
+};
+
+#define FIXADDR_TOP     (VMALLOC_START - PAGE_SIZE)
+#define FIXADDR_SIZE    (__end_of_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START   ((FIXADDR_TOP - FIXADDR_SIZE) & PMD_MASK)
+
+#include <asm-generic/fixmap.h>
+
+#define kmap_get_fixmap_pte(vaddr) \
+        pte_offset_kernel( \
+                pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), \
+                (vaddr) \
+        )
+
+#endif
diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h
index 80be15124697..2653ef5d55f1 100644
--- a/arch/xtensa/include/asm/highmem.h
+++ b/arch/xtensa/include/asm/highmem.h
@@ -6,11 +6,54 @@
  * this archive for more details.
  *
  * Copyright (C) 2003 - 2005 Tensilica Inc.
+ * Copyright (C) 2014 Cadence Design Systems Inc.
  */
 
 #ifndef _XTENSA_HIGHMEM_H
 #define _XTENSA_HIGHMEM_H
 
-extern void flush_cache_kmaps(void);
+#include <asm/cacheflush.h>
+#include <asm/fixmap.h>
+#include <asm/kmap_types.h>
+#include <asm/pgtable.h>
+
+#define PKMAP_BASE              (FIXADDR_START - PMD_SIZE)
+#define LAST_PKMAP              PTRS_PER_PTE
+#define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
+#define PKMAP_NR(virt)          (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
+#define PKMAP_ADDR(nr)          (PKMAP_BASE + ((nr) << PAGE_SHIFT))
+
+#define kmap_prot               PAGE_KERNEL
+
+extern pte_t *pkmap_page_table;
+
+void *kmap_high(struct page *page);
+void kunmap_high(struct page *page);
+
+static inline void *kmap(struct page *page)
+{
+        BUG_ON(in_interrupt());
+        if (!PageHighMem(page))
+                return page_address(page);
+        return kmap_high(page);
+}
+
+static inline void kunmap(struct page *page)
+{
+        BUG_ON(in_interrupt());
+        if (!PageHighMem(page))
+                return;
+        kunmap_high(page);
+}
+
+static inline void flush_cache_kmaps(void)
+{
+        flush_cache_all();
+}
+
+void *kmap_atomic(struct page *page);
+void __kunmap_atomic(void *kvaddr);
+
+void kmap_init(void);
 
 #endif
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 216446295ada..4b0ca35a93b1 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -310,6 +310,10 @@ set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval)
         update_pte(ptep, pteval);
 }
 
+static inline void set_pte(pte_t *ptep, pte_t pteval)
+{
+        update_pte(ptep, pteval);
+}
 
 static inline void
 set_pmd(pmd_t *pmdp, pmd_t pmdval)
diff --git a/arch/xtensa/include/asm/sysmem.h b/arch/xtensa/include/asm/sysmem.h
new file mode 100644
index 000000000000..c015c5c8e3f7
--- /dev/null
+++ b/arch/xtensa/include/asm/sysmem.h
@@ -0,0 +1,38 @@
+/*
+ * sysmem-related prototypes.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2014 Cadence Design Systems Inc.
+ */
+
+#ifndef _XTENSA_SYSMEM_H
+#define _XTENSA_SYSMEM_H
+
+#define SYSMEM_BANKS_MAX 31
+
+struct meminfo {
+        unsigned long start;
+        unsigned long end;
+};
+
+/*
+ * Bank array is sorted by .start.
+ * Banks don't overlap and there's at least one page gap
+ * between adjacent bank entries.
+ */
+struct sysmem_info {
+        int nr_banks;
+        struct meminfo bank[SYSMEM_BANKS_MAX];
+};
+
+extern struct sysmem_info sysmem;
+
+int add_sysmem_bank(unsigned long start, unsigned long end);
+int mem_reserve(unsigned long, unsigned long, int);
+void bootmem_init(void);
+void zones_init(void);
+
+#endif /* _XTENSA_SYSMEM_H */
diff --git a/arch/xtensa/include/asm/tlbflush.h b/arch/xtensa/include/asm/tlbflush.h
index fc34274ce41b..06875feb27c2 100644
--- a/arch/xtensa/include/asm/tlbflush.h
+++ b/arch/xtensa/include/asm/tlbflush.h
@@ -36,6 +36,7 @@ void local_flush_tlb_page(struct vm_area_struct *vma,
                 unsigned long page);
 void local_flush_tlb_range(struct vm_area_struct *vma,
                 unsigned long start, unsigned long end);
+void local_flush_tlb_kernel_range(unsigned long start, unsigned long end);
 
 #ifdef CONFIG_SMP
 
@@ -44,12 +45,7 @@ void flush_tlb_mm(struct mm_struct *);
 void flush_tlb_page(struct vm_area_struct *, unsigned long);
 void flush_tlb_range(struct vm_area_struct *, unsigned long,
                 unsigned long);
-
-static inline void flush_tlb_kernel_range(unsigned long start,
-                unsigned long end)
-{
-        flush_tlb_all();
-}
+void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 
 #else /* !CONFIG_SMP */
 
@@ -58,7 +54,8 @@ static inline void flush_tlb_kernel_range(unsigned long start,
 #define flush_tlb_page(vma, page)          local_flush_tlb_page(vma, page)
 #define flush_tlb_range(vma, vmaddr, end)  local_flush_tlb_range(vma, vmaddr, \
                                                                  end)
-#define flush_tlb_kernel_range(start, end) local_flush_tlb_all()
+#define flush_tlb_kernel_range(start, end) local_flush_tlb_kernel_range(start, \
+                                                                        end)
 
 #endif /* CONFIG_SMP */
 
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 84fe931bb60e..9757bb74e532 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -50,6 +50,7 @@
 #include <asm/param.h>
 #include <asm/traps.h>
 #include <asm/smp.h>
+#include <asm/sysmem.h>
 
 #include <platform/hardware.h>
 
@@ -88,12 +89,6 @@ static char __initdata command_line[COMMAND_LINE_SIZE];
 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 #endif
 
-sysmem_info_t __initdata sysmem;
-
-extern int mem_reserve(unsigned long, unsigned long, int);
-extern void bootmem_init(void);
-extern void zones_init(void);
-
 /*
  * Boot parameter parsing.
  *
@@ -113,31 +108,14 @@ typedef struct tagtable {
 
 /* parse current tag */
 
-static int __init add_sysmem_bank(unsigned long type, unsigned long start,
-                unsigned long end)
-{
-        if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
-                printk(KERN_WARNING
-                                "Ignoring memory bank 0x%08lx size %ldKB\n",
-                                start, end - start);
-                return -EINVAL;
-        }
-        sysmem.bank[sysmem.nr_banks].type  = type;
-        sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(start);
-        sysmem.bank[sysmem.nr_banks].end   = end & PAGE_MASK;
-        sysmem.nr_banks++;
-
-        return 0;
-}
-
 static int __init parse_tag_mem(const bp_tag_t *tag)
 {
-        meminfo_t *mi = (meminfo_t *)(tag->data);
+        struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
 
         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
                 return -1;
 
-        return add_sysmem_bank(mi->type, mi->start, mi->end);
+        return add_sysmem_bank(mi->start, mi->end);
 }
 
 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
@@ -146,8 +124,8 @@ __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 
 static int __init parse_tag_initrd(const bp_tag_t* tag)
 {
-        meminfo_t* mi;
-        mi = (meminfo_t*)(tag->data);
+        struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
+
         initrd_start = (unsigned long)__va(mi->start);
         initrd_end = (unsigned long)__va(mi->end);
 
@@ -255,7 +233,7 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
                 return;
 
         size &= PAGE_MASK;
-        add_sysmem_bank(MEMORY_TYPE_CONVENTIONAL, base, base + size);
+        add_sysmem_bank(base, base + size);
 }
 
 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
@@ -292,8 +270,6 @@ device_initcall(xtensa_device_probe);
 
 void __init init_arch(bp_tag_t *bp_start)
 {
-        sysmem.nr_banks = 0;
-
         /* Parse boot parameters */
 
         if (bp_start)
@@ -304,10 +280,9 @@ void __init init_arch(bp_tag_t *bp_start)
 #endif
 
         if (sysmem.nr_banks == 0) {
-                sysmem.nr_banks = 1;
-                sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
-                sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
-                                     + PLATFORM_DEFAULT_MEM_SIZE;
+                add_sysmem_bank(PLATFORM_DEFAULT_MEM_START,
+                                PLATFORM_DEFAULT_MEM_START +
+                                PLATFORM_DEFAULT_MEM_SIZE);
         }
 
 #ifdef CONFIG_CMDLINE_BOOL
@@ -487,7 +462,7 @@ void __init setup_arch(char **cmdline_p)
 #ifdef CONFIG_BLK_DEV_INITRD
         if (initrd_start < initrd_end) {
                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
-                                               __pa(initrd_end), 0);
+                                               __pa(initrd_end), 0) == 0;
                 initrd_below_start_ok = 1;
         } else {
                 initrd_start = 0;
@@ -532,6 +507,7 @@ void __init setup_arch(char **cmdline_p)
                     __pa(&_Level6InterruptVector_text_end), 0);
 #endif
 
+        parse_early_param();
         bootmem_init();
 
         unflatten_and_copy_device_tree();
diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c
index aa8bd8717927..40b5a3771fb0 100644
--- a/arch/xtensa/kernel/smp.c
+++ b/arch/xtensa/kernel/smp.c
@@ -496,6 +496,21 @@ void flush_tlb_range(struct vm_area_struct *vma,
         on_each_cpu(ipi_flush_tlb_range, &fd, 1);
 }
 
+static void ipi_flush_tlb_kernel_range(void *arg)
+{
+        struct flush_data *fd = arg;
+        local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+        struct flush_data fd = {
+                .addr1 = start,
+                .addr2 = end,
+        };
+        on_each_cpu(ipi_flush_tlb_kernel_range, &fd, 1);
+}
+
 /* Cache flush functions */
 
 static void ipi_flush_cache_all(void *arg)
diff --git a/arch/xtensa/kernel/xtensa_ksyms.c b/arch/xtensa/kernel/xtensa_ksyms.c
index 80b33ed51f31..4d2872fd9bb5 100644
--- a/arch/xtensa/kernel/xtensa_ksyms.c
+++ b/arch/xtensa/kernel/xtensa_ksyms.c
@@ -20,6 +20,7 @@
 #include <linux/in6.h>
 
 #include <asm/uaccess.h>
+#include <asm/cacheflush.h>
 #include <asm/checksum.h>
 #include <asm/dma.h>
 #include <asm/io.h>
@@ -105,6 +106,7 @@ EXPORT_SYMBOL(csum_partial_copy_generic);
  * Architecture-specific symbols
  */
 EXPORT_SYMBOL(__xtensa_copy_user);
+EXPORT_SYMBOL(__invalidate_icache_range);
 
 /*
  * Kernel hacking ...
@@ -127,3 +129,8 @@ EXPORT_SYMBOL(common_exception_return);
 #ifdef CONFIG_FUNCTION_TRACER
 EXPORT_SYMBOL(_mcount);
 #endif
+
+EXPORT_SYMBOL(__invalidate_dcache_range);
+#if XCHAL_DCACHE_IS_WRITEBACK
+EXPORT_SYMBOL(__flush_dcache_range);
+#endif
diff --git a/arch/xtensa/mm/Makefile b/arch/xtensa/mm/Makefile
index f0b646d2f843..f54f78e24d7b 100644
--- a/arch/xtensa/mm/Makefile
+++ b/arch/xtensa/mm/Makefile
@@ -4,3 +4,4 @@
 
 obj-y                   := init.o cache.o misc.o
 obj-$(CONFIG_MMU)       += fault.o mmu.o tlb.o
+obj-$(CONFIG_HIGHMEM)   += highmem.o
diff --git a/arch/xtensa/mm/cache.c b/arch/xtensa/mm/cache.c
index ba4c47f291b1..63cbb867dadd 100644
--- a/arch/xtensa/mm/cache.c
+++ b/arch/xtensa/mm/cache.c
@@ -59,6 +59,10 @@
  *
  */
 
+#if (DCACHE_WAY_SIZE > PAGE_SIZE) && defined(CONFIG_HIGHMEM)
+#error "HIGHMEM is not supported on cores with aliasing cache."
+#endif
+
 #if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
 
 /*
@@ -179,10 +183,11 @@ update_mmu_cache(struct vm_area_struct * vma, unsigned long addr, pte_t *ptep)
 #else
         if (!PageReserved(page) && !test_bit(PG_arch_1, &page->flags)
             && (vma->vm_flags & VM_EXEC) != 0) {
-                unsigned long paddr = (unsigned long) page_address(page);
+                unsigned long paddr = (unsigned long)kmap_atomic(page);
                 __flush_dcache_page(paddr);
                 __invalidate_icache_page(paddr);
                 set_bit(PG_arch_1, &page->flags);
+                kunmap_atomic((void *)paddr);
         }
 #endif
 }
diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c
new file mode 100644
index 000000000000..17a8c0d6fd17
--- /dev/null
+++ b/arch/xtensa/mm/highmem.c
@@ -0,0 +1,72 @@
+/*
+ * High memory support for Xtensa architecture
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file "COPYING" in the main directory of
+ * this archive for more details.
+ *
+ * Copyright (C) 2014 Cadence Design Systems Inc.
+ */
+
+#include <linux/export.h>
+#include <linux/highmem.h>
+#include <asm/tlbflush.h>
+
+static pte_t *kmap_pte;
+
+void *kmap_atomic(struct page *page)
+{
+        enum fixed_addresses idx;
+        unsigned long vaddr;
+        int type;
+
+        pagefault_disable();
+        if (!PageHighMem(page))
+                return page_address(page);
+
+        type = kmap_atomic_idx_push();
+        idx = type + KM_TYPE_NR * smp_processor_id();
+        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+#ifdef CONFIG_DEBUG_HIGHMEM
+        BUG_ON(!pte_none(*(kmap_pte - idx)));
+#endif
+        set_pte(kmap_pte - idx, mk_pte(page, PAGE_KERNEL_EXEC));
+
+        return (void *)vaddr;
+}
+EXPORT_SYMBOL(kmap_atomic);
+
+void __kunmap_atomic(void *kvaddr)
+{
+        int idx, type;
+
+        if (kvaddr >= (void *)FIXADDR_START &&
+            kvaddr < (void *)FIXADDR_TOP) {
+                type = kmap_atomic_idx();
+                idx = type + KM_TYPE_NR * smp_processor_id();
+
+                /*
+                 * Force other mappings to Oops if they'll try to access this
+                 * pte without first remap it.  Keeping stale mappings around
+                 * is a bad idea also, in case the page changes cacheability
+                 * attributes or becomes a protected page in a hypervisor.
+                 */
+                pte_clear(&init_mm, kvaddr, kmap_pte - idx);
+                local_flush_tlb_kernel_range((unsigned long)kvaddr,
+                                             (unsigned long)kvaddr + PAGE_SIZE);
+
+                kmap_atomic_idx_pop();
+        }
+
+        pagefault_enable();
+}
+EXPORT_SYMBOL(__kunmap_atomic);
+
+void __init kmap_init(void)
+{
+        unsigned long kmap_vstart;
+
+        /* cache the first kmap pte */
+        kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
+        kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
+}
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index aff108df92d3..4224256bb215 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -8,6 +8,7 @@
  * for more details.
  *
  * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2014 Cadence Design Systems Inc.
  *
  * Chris Zankel <chris@zankel.net>
  * Joe Taylor   <joe@tensilica.com, joetylr@yahoo.com>
@@ -19,6 +20,7 @@
 #include <linux/errno.h>
 #include <linux/bootmem.h>
 #include <linux/gfp.h>
+#include <linux/highmem.h>
 #include <linux/swap.h>
 #include <linux/mman.h>
 #include <linux/nodemask.h>
@@ -27,11 +29,133 @@
 #include <asm/bootparam.h>
 #include <asm/page.h>
 #include <asm/sections.h>
+#include <asm/sysmem.h>
+
+struct sysmem_info sysmem __initdata;
+
+static void __init sysmem_dump(void)
+{
+        unsigned i;
+
+        pr_debug("Sysmem:\n");
+        for (i = 0; i < sysmem.nr_banks; ++i)
+                pr_debug("  0x%08lx - 0x%08lx (%ldK)\n",
+                         sysmem.bank[i].start, sysmem.bank[i].end,
+                         (sysmem.bank[i].end - sysmem.bank[i].start) >> 10);
+}
+
+/*
+ * Find bank with maximal .start such that bank.start <= start
+ */
+static inline struct meminfo * __init find_bank(unsigned long start)
+{
+        unsigned i;
+        struct meminfo *it = NULL;
+
+        for (i = 0; i < sysmem.nr_banks; ++i)
+                if (sysmem.bank[i].start <= start)
+                        it = sysmem.bank + i;
+                else
+                        break;
+        return it;
+}
+
+/*
+ * Move all memory banks starting at 'from' to a new place at 'to',
+ * adjust nr_banks accordingly.
+ * Both 'from' and 'to' must be inside the sysmem.bank.
+ *
+ * Returns: 0 (success), -ENOMEM (not enough space in the sysmem.bank).
+ */
+static int __init move_banks(struct meminfo *to, struct meminfo *from)
+{
+        unsigned n = sysmem.nr_banks - (from - sysmem.bank);
+
+        if (to > from && to - from + sysmem.nr_banks > SYSMEM_BANKS_MAX)
+                return -ENOMEM;
+        if (to != from)
+                memmove(to, from, n * sizeof(struct meminfo));
+        sysmem.nr_banks += to - from;
+        return 0;
+}
+
+/*
+ * Add new bank to sysmem. Resulting sysmem is the union of bytes of the
+ * original sysmem and the new bank.
+ *
+ * Returns: 0 (success), < 0 (error)
+ */
+int __init add_sysmem_bank(unsigned long start, unsigned long end)
+{
+        unsigned i;
+        struct meminfo *it = NULL;
+        unsigned long sz;
+        unsigned long bank_sz = 0;
+
+        if (start == end ||
+            (start < end) != (PAGE_ALIGN(start) < (end & PAGE_MASK))) {
+                pr_warn("Ignoring small memory bank 0x%08lx size: %ld bytes\n",
+                        start, end - start);
+                return -EINVAL;
+        }
+
+        start = PAGE_ALIGN(start);
+        end &= PAGE_MASK;
+        sz = end - start;
+
+        it = find_bank(start);
+
+        if (it)
+                bank_sz = it->end - it->start;
+
+        if (it && bank_sz >= start - it->start) {
+                if (end - it->start > bank_sz)
+                        it->end = end;
+                else
+                        return 0;
+        } else {
+                if (!it)
+                        it = sysmem.bank;
+                else
+                        ++it;
+
+                if (it - sysmem.bank < sysmem.nr_banks &&
+                    it->start - start <= sz) {
+                        it->start = start;
+                        if (it->end - it->start < sz)
+                                it->end = end;
+                        else
+                                return 0;
+                } else {
+                        if (move_banks(it + 1, it) < 0) {
+                                pr_warn("Ignoring memory bank 0x%08lx size %ld bytes\n",
+                                        start, end - start);
+                                return -EINVAL;
+                        }
+                        it->start = start;
+                        it->end = end;
+                        return 0;
+                }
+        }
+        sz = it->end - it->start;
+        for (i = it + 1 - sysmem.bank; i < sysmem.nr_banks; ++i)
+                if (sysmem.bank[i].start - it->start <= sz) {
+                        if (sz < sysmem.bank[i].end - it->start)
+                                it->end = sysmem.bank[i].end;
+                } else {
+                        break;
+                }
+
+        move_banks(it + 1, sysmem.bank + i);
+        return 0;
+}
 
 /*
  * mem_reserve(start, end, must_exist)
  *
  * Reserve some memory from the memory pool.
+ * If must_exist is set and a part of the region being reserved does not exist
+ * memory map is not altered.
  *
  * Parameters:
  *  start       Start of region,
@@ -39,53 +163,69 @@
  *  must_exist  Must exist in memory pool.
  *
  * Returns:
- *  0 (memory area couldn't be mapped)
- * -1 (success)
+ *  0 (success)
+ *  < 0 (error)
  */
 
 int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
 {
-        int i;
-
-        if (start == end)
-                return 0;
+        struct meminfo *it;
+        struct meminfo *rm = NULL;
+        unsigned long sz;
+        unsigned long bank_sz = 0;
 
         start = start & PAGE_MASK;
         end = PAGE_ALIGN(end);
+        sz = end - start;
+        if (!sz)
+                return -EINVAL;
 
-        for (i = 0; i < sysmem.nr_banks; i++)
-                if (start < sysmem.bank[i].end
-                    && end >= sysmem.bank[i].start)
-                        break;
+        it = find_bank(start);
+
+        if (it)
+                bank_sz = it->end - it->start;
 
-        if (i == sysmem.nr_banks) {
-                if (must_exist)
-                        printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) "
-                                "not in any region!\n", start, end);
-                return 0;
+        if ((!it || end - it->start > bank_sz) && must_exist) {
+                pr_warn("mem_reserve: [0x%0lx, 0x%0lx) not in any region!\n",
+                        start, end);
+                return -EINVAL;
         }
 
-        if (start > sysmem.bank[i].start) {
-                if (end < sysmem.bank[i].end) {
-                        /* split entry */
-                        if (sysmem.nr_banks >= SYSMEM_BANKS_MAX)
-                                panic("meminfo overflow\n");
-                        sysmem.bank[sysmem.nr_banks].start = end;
-                        sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end;
-                        sysmem.nr_banks++;
+        if (it && start - it->start < bank_sz) {
+                if (start == it->start) {
+                        if (end - it->start < bank_sz) {
+                                it->start = end;
+                                return 0;
+                        } else {
+                                rm = it;
+                        }
+                } else {
+                        it->end = start;
+                        if (end - it->start < bank_sz)
+                                return add_sysmem_bank(end,
+                                                       it->start + bank_sz);
+                        ++it;
                 }
-                sysmem.bank[i].end = start;
+        }
 
-        } else if (end < sysmem.bank[i].end) {
-                sysmem.bank[i].start = end;
+        if (!it)
+                it = sysmem.bank;
 
-        } else {
-                /* remove entry */
-                sysmem.nr_banks--;
-                sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start;
-                sysmem.bank[i].end   = sysmem.bank[sysmem.nr_banks].end;
+        for (; it < sysmem.bank + sysmem.nr_banks; ++it) {
+                if (it->end - start <= sz) {
+                        if (!rm)
+                                rm = it;
+                } else {
+                        if (it->start - start < sz)
+                                it->start = end;
+                        break;
+                }
         }
-        return -1;
+
+        if (rm)
+                move_banks(rm, it);
+
+        return 0;
 }
 
 
@@ -99,6 +239,7 @@ void __init bootmem_init(void)
         unsigned long bootmap_start, bootmap_size;
         int i;
 
+        sysmem_dump();
         max_low_pfn = max_pfn = 0;
         min_low_pfn = ~0;
 
@@ -156,19 +297,13 @@ void __init bootmem_init(void)
 
 void __init zones_init(void)
 {
-        unsigned long zones_size[MAX_NR_ZONES];
-        int i;
-
         /* All pages are DMA-able, so we put them all in the DMA zone. */
-
-        zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
-        for (i = 1; i < MAX_NR_ZONES; i++)
-                zones_size[i] = 0;
-
+        unsigned long zones_size[MAX_NR_ZONES] = {
+                [ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
 #ifdef CONFIG_HIGHMEM
-        zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
+                [ZONE_HIGHMEM] = max_pfn - max_low_pfn,
 #endif
-
+        };
         free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
 }
 
@@ -178,16 +313,38 @@ void __init zones_init(void)
 
 void __init mem_init(void)
 {
-        max_mapnr = max_low_pfn - ARCH_PFN_OFFSET;
-        high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
-
 #ifdef CONFIG_HIGHMEM
-#error HIGHGMEM not implemented in init.c
+        unsigned long tmp;
+
+        reset_all_zones_managed_pages();
+        for (tmp = max_low_pfn; tmp < max_pfn; tmp++)
+                free_highmem_page(pfn_to_page(tmp));
 #endif
 
+        max_mapnr = max_pfn - ARCH_PFN_OFFSET;
+        high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);
+
         free_all_bootmem();
 
         mem_init_print_info(NULL);
+        pr_info("virtual kernel memory layout:\n"
+#ifdef CONFIG_HIGHMEM
+                "    pkmap   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
+                "    fixmap  : 0x%08lx - 0x%08lx  (%5lu kB)\n"
+#endif
+                "    vmalloc : 0x%08x - 0x%08x  (%5u MB)\n"
+                "    lowmem  : 0x%08x - 0x%08lx  (%5lu MB)\n",
+#ifdef CONFIG_HIGHMEM
+                PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
+                (LAST_PKMAP*PAGE_SIZE) >> 10,
+                FIXADDR_START, FIXADDR_TOP,
+                (FIXADDR_TOP - FIXADDR_START) >> 10,
+#endif
+                VMALLOC_START, VMALLOC_END,
+                (VMALLOC_END - VMALLOC_START) >> 20,
+                PAGE_OFFSET, PAGE_OFFSET +
+                (max_low_pfn - min_low_pfn) * PAGE_SIZE,
+                ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -204,3 +361,53 @@ void free_initmem(void)
 {
         free_initmem_default(-1);
 }
+
+static void __init parse_memmap_one(char *p)
+{
+        char *oldp;
+        unsigned long start_at, mem_size;
+
+        if (!p)
+                return;
+
+        oldp = p;
+        mem_size = memparse(p, &p);
+        if (p == oldp)
+                return;
+
+        switch (*p) {
+        case '@':
+                start_at = memparse(p + 1, &p);
+                add_sysmem_bank(start_at, start_at + mem_size);
+                break;
+
+        case '$':
+                start_at = memparse(p + 1, &p);
+                mem_reserve(start_at, start_at + mem_size, 0);
+                break;
+
+        case 0:
+                mem_reserve(mem_size, 0, 0);
+                break;
+
+        default:
+                pr_warn("Unrecognized memmap syntax: %s\n", p);
+                break;
+        }
+}
+
+static int __init parse_memmap_opt(char *str)
+{
+        while (str) {
+                char *k = strchr(str, ',');
+
+                if (k)
+                        *k++ = 0;
+
+                parse_memmap_one(str);
+                str = k;
+        }
+
+        return 0;
+}
+early_param("memmap", parse_memmap_opt);
diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c
index 861203e958da..3429b483d9f8 100644
--- a/arch/xtensa/mm/mmu.c
+++ b/arch/xtensa/mm/mmu.c
@@ -3,6 +3,7 @@
  *
  * Extracted from init.c
  */
+#include <linux/bootmem.h>
 #include <linux/percpu.h>
 #include <linux/init.h>
 #include <linux/string.h>
@@ -16,9 +17,44 @@
 #include <asm/initialize_mmu.h>
 #include <asm/io.h>
 
+#if defined(CONFIG_HIGHMEM)
+static void * __init init_pmd(unsigned long vaddr)
+{
+        pgd_t *pgd = pgd_offset_k(vaddr);
+        pmd_t *pmd = pmd_offset(pgd, vaddr);
+
+        if (pmd_none(*pmd)) {
+                unsigned i;
+                pte_t *pte = alloc_bootmem_low_pages(PAGE_SIZE);
+
+                for (i = 0; i < 1024; i++)
+                        pte_clear(NULL, 0, pte + i);
+
+                set_pmd(pmd, __pmd(((unsigned long)pte) & PAGE_MASK));
+                BUG_ON(pte != pte_offset_kernel(pmd, 0));
+                pr_debug("%s: vaddr: 0x%08lx, pmd: 0x%p, pte: 0x%p\n",
+                         __func__, vaddr, pmd, pte);
+                return pte;
+        } else {
+                return pte_offset_kernel(pmd, 0);
+        }
+}
+
+static void __init fixedrange_init(void)
+{
+        BUILD_BUG_ON(FIXADDR_SIZE > PMD_SIZE);
+        init_pmd(__fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK);
+}
+#endif
+
 void __init paging_init(void)
 {
         memset(swapper_pg_dir, 0, PAGE_SIZE);
+#ifdef CONFIG_HIGHMEM
+        fixedrange_init();
+        pkmap_page_table = init_pmd(PKMAP_BASE);
+        kmap_init();
+#endif
 }
 
 /*
diff --git a/arch/xtensa/mm/tlb.c b/arch/xtensa/mm/tlb.c
index ade623826788..5ece856c5725 100644
--- a/arch/xtensa/mm/tlb.c
+++ b/arch/xtensa/mm/tlb.c
@@ -149,6 +149,21 @@ void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
         local_irq_restore(flags);
 }
 
+void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+        if (end > start && start >= TASK_SIZE && end <= PAGE_OFFSET &&
+            end - start < _TLB_ENTRIES << PAGE_SHIFT) {
+                start &= PAGE_MASK;
+                while (start < end) {
+                        invalidate_itlb_mapping(start);
+                        invalidate_dtlb_mapping(start);
+                        start += PAGE_SIZE;
+                }
+        } else {
+                local_flush_tlb_all();
+        }
+}
+
 #ifdef CONFIG_DEBUG_TLB_SANITY
 
 static unsigned get_pte_for_vaddr(unsigned vaddr)
diff --git a/arch/xtensa/platforms/iss/Makefile b/arch/xtensa/platforms/iss/Makefile
index d2369b799c50..b3e89291cfba 100644
--- a/arch/xtensa/platforms/iss/Makefile
+++ b/arch/xtensa/platforms/iss/Makefile
@@ -4,6 +4,7 @@
 # "prom monitor" library routines under Linux.
 #
 
-obj-y                   = console.o setup.o
+obj-y                   = setup.o
+obj-$(CONFIG_TTY)       += console.o
 obj-$(CONFIG_NET)       += network.o
 obj-$(CONFIG_BLK_DEV_SIMDISK) += simdisk.o
diff --git a/arch/xtensa/platforms/xt2000/setup.c b/arch/xtensa/platforms/xt2000/setup.c
index f9bc87966290..b90555cb8089 100644
--- a/arch/xtensa/platforms/xt2000/setup.c
+++ b/arch/xtensa/platforms/xt2000/setup.c
@@ -92,18 +92,8 @@ void __init platform_setup(char** cmdline)
 
 /* early initialization */
 
-extern sysmem_info_t __initdata sysmem;
-
-void platform_init(bp_tag_t* first)
+void __init platform_init(bp_tag_t *first)
 {
-        /* Set default memory block if not provided by the bootloader. */
-
-        if (sysmem.nr_banks == 0) {
-                sysmem.nr_banks = 1;
-                sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
-                sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
-                                     + PLATFORM_DEFAULT_MEM_SIZE;
-        }
 }
 
 /* Heartbeat. Let the LED blink. */