From 1b2e2b73b4c84c918686c04a00724197036c0847 Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Mon, 21 Aug 2006 17:06:38 +0100
Subject: [ARM] Cleanup arch/arm/mm a little
Move top_pmd into arch/arm/mm/mm.h - nothing outside arch/arm/mm
references it.
Move the repeated definition of TOP_PTE into mm/mm.h, as well as
a few function prototypes.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mm/init.c | 20 +++++++-------------
1 file changed, 7 insertions(+), 13 deletions(-)
(limited to 'arch/arm/mm/init.c')
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index fe3f7f62500..1099af6d470 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -25,6 +25,8 @@
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
+#include "mm.h"
+
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
@@ -44,6 +46,11 @@ static struct meminfo meminfo __initdata = { 0, };
*/
struct page *empty_zero_page;
+/*
+ * The pmd table for the upper-most set of pages.
+ */
+pmd_t *top_pmd;
+
void show_mem(void)
{
int free = 0, total = 0, reserved = 0;
@@ -83,16 +90,6 @@ void show_mem(void)
printk("%d pages swap cached\n", cached);
}
-static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt)
-{
- return pmd_offset(pgd, virt);
-}
-
-static inline pmd_t *pmd_off_k(unsigned long virt)
-{
- return pmd_off(pgd_offset_k(virt), virt);
-}
-
#define for_each_nodebank(iter,mi,no) \
for (iter = 0; iter < mi->nr_banks; iter++) \
if (mi->bank[iter].node == no)
@@ -229,9 +226,6 @@ static __init void reserve_node_zero(pg_data_t *pgdat)
reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
}
-void __init build_mem_type_table(void);
-void __init create_mapping(struct map_desc *md);
-
static unsigned long __init
bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
{
--
cgit v1.2.3-70-g09d2
From 4052ebb7a2729bd7c28260cdf8e470c0d81b9c56 Mon Sep 17 00:00:00 2001
From: "George G. Davis" <davis_g@mvista.com>
Date: Fri, 22 Sep 2006 18:36:38 +0100
Subject: [ARM] 3859/1: Fix devicemaps_init() XIP_KERNEL odd 1MiB XIP_PHYS_ADDR
translation error
The ARM XIP_KERNEL map created in devicemaps_init() is wrong.
The map.pfn is rounded down to an even 1MiB section boundary
which results in va/pa translations errors when XIP_PHYS_ADDR
starts on an odd 1MiB boundary and this causes the kernel to
hang. This patch fixes ARM XIP_KERNEL translation errors for
the odd 1MiB XIP_PHYS_ADDR boundary case.
Signed-off-by: George G. Davis <gdavis@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mm/init.c | 4 ++--
include/asm-arm/pgtable.h | 7 +++++++
2 files changed, 9 insertions(+), 2 deletions(-)
(limited to 'arch/arm/mm/init.c')
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 1099af6d470..64262bda8e5 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -434,9 +434,9 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
* It is always first in the modulearea.
*/
#ifdef CONFIG_XIP_KERNEL
- map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & PGDIR_MASK);
+ map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
map.virtual = MODULE_START;
- map.length = ((unsigned long)&_etext - map.virtual + ~PGDIR_MASK) & PGDIR_MASK;
+ map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
map.type = MT_ROM;
create_mapping(&map);
#endif
diff --git a/include/asm-arm/pgtable.h b/include/asm-arm/pgtable.h
index 8d3919c6458..38b2b55688e 100644
--- a/include/asm-arm/pgtable.h
+++ b/include/asm-arm/pgtable.h
@@ -135,6 +135,13 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
#define FIRST_USER_PGD_NR 1
#define USER_PTRS_PER_PGD ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
+/*
+ * section address mask and size definitions.
+ */
+#define SECTION_SHIFT 20
+#define SECTION_SIZE (1UL << SECTION_SHIFT)
+#define SECTION_MASK (~(SECTION_SIZE-1))
+
/*
* ARMv6 supersection address mask and size definitions.
*/
--
cgit v1.2.3-70-g09d2
From 456335e2072fb35bf290b45e61d51916c322c145 Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Wed, 27 Sep 2006 10:00:54 +0100
Subject: [ARM] Separate page table manipulation code from bootmem
initialisation
nommu does not require the page table manipulation code in the
bootmem initialisation paths. Move this into separate inline
functions.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mm/init.c | 73 +++++++++++++++++++++++++++++--------------------
include/asm-arm/setup.h | 12 ++++----
2 files changed, 51 insertions(+), 34 deletions(-)
(limited to 'arch/arm/mm/init.c')
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 64262bda8e5..83145d1d338 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -226,6 +226,44 @@ static __init void reserve_node_zero(pg_data_t *pgdat)
reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
}
+static inline void prepare_page_table(struct meminfo *mi)
+{
+ unsigned long addr;
+
+ /*
+ * Clear out all the mappings below the kernel image.
+ */
+ for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+#ifdef CONFIG_XIP_KERNEL
+ /* The XIP kernel is mapped in the module area -- skip over it */
+ addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
+#endif
+ for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+ /*
+ * Clear out all the kernel space mappings, except for the first
+ * memory bank, up to the end of the vmalloc region.
+ */
+ for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
+ addr < VMALLOC_END; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+}
+
+static inline void map_memory_bank(struct membank *bank)
+{
+ struct map_desc map;
+
+ map.pfn = __phys_to_pfn(bank->start);
+ map.virtual = __phys_to_virt(bank->start);
+ map.length = bank->size;
+ map.type = MT_MEMORY;
+
+ create_mapping(&map);
+}
+
static unsigned long __init
bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
{
@@ -242,23 +280,18 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
* Calculate the pfn range, and map the memory banks for this node.
*/
for_each_nodebank(i, mi, node) {
+ struct membank *bank = &mi->bank[i];
unsigned long start, end;
- struct map_desc map;
- start = mi->bank[i].start >> PAGE_SHIFT;
- end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT;
+ start = bank->start >> PAGE_SHIFT;
+ end = (bank->start + bank->size) >> PAGE_SHIFT;
if (start_pfn > start)
start_pfn = start;
if (end_pfn < end)
end_pfn = end;
- map.pfn = __phys_to_pfn(mi->bank[i].start);
- map.virtual = __phys_to_virt(mi->bank[i].start);
- map.length = mi->bank[i].size;
- map.type = MT_MEMORY;
-
- create_mapping(&map);
+ map_memory_bank(bank);
}
/*
@@ -342,7 +375,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
static void __init bootmem_init(struct meminfo *mi)
{
- unsigned long addr, memend_pfn = 0;
+ unsigned long memend_pfn = 0;
int node, initrd_node, i;
/*
@@ -354,25 +387,7 @@ static void __init bootmem_init(struct meminfo *mi)
memcpy(&meminfo, mi, sizeof(meminfo));
- /*
- * Clear out all the mappings below the kernel image.
- */
- for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-#ifdef CONFIG_XIP_KERNEL
- /* The XIP kernel is mapped in the module area -- skip over it */
- addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
-#endif
- for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-
- /*
- * Clear out all the kernel space mappings, except for the first
- * memory bank, up to the end of the vmalloc region.
- */
- for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
- addr < VMALLOC_END; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
+ prepare_page_table(mi);
/*
* Locate which node contains the ramdisk image, if any.
diff --git a/include/asm-arm/setup.h b/include/asm-arm/setup.h
index ea3ed246523..aa4b5782f0c 100644
--- a/include/asm-arm/setup.h
+++ b/include/asm-arm/setup.h
@@ -194,13 +194,15 @@ static struct tagtable __tagtable_##fn __tag = { tag, fn }
# define NR_BANKS 8
#endif
+struct membank {
+ unsigned long start;
+ unsigned long size;
+ int node;
+};
+
struct meminfo {
int nr_banks;
- struct {
- unsigned long start;
- unsigned long size;
- int node;
- } bank[NR_BANKS];
+ struct membank bank[NR_BANKS];
};
/*
--
cgit v1.2.3-70-g09d2
From d111e8f9644aa585c1a7e198d74a4d2682ef1374 Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Wed, 27 Sep 2006 15:27:33 +0100
Subject: [ARM] Split ARM MM initialisation for !mmu
Move the MMU specific code from init.c into mmu.c, and add nommu
fixups to nommu.c
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mm/Makefile | 2 +-
arch/arm/mm/init.c | 209 +---------------------------------------------
arch/arm/mm/mm.h | 4 +
arch/arm/mm/mmu.c | 229 +++++++++++++++++++++++++++++++++++++++++++++++++++
arch/arm/mm/nommu.c | 36 ++++++++
5 files changed, 274 insertions(+), 206 deletions(-)
create mode 100644 arch/arm/mm/mmu.c
(limited to 'arch/arm/mm/init.c')
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index 1a1563f859a..cabaa3b3054 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -6,7 +6,7 @@ obj-y := consistent.o extable.o fault.o init.o \
iomap.o
obj-$(CONFIG_MMU) += fault-armv.o flush.o ioremap.o mmap.o \
- mm-armv.o
+ mm-armv.o mmu.o
ifneq ($(CONFIG_MMU),y)
obj-y += nommu.o
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 83145d1d338..22217fe2650 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -27,10 +27,7 @@
#include "mm.h"
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end;
+extern void _text, _etext, __data_start, _end, __init_begin, __init_end;
extern unsigned long phys_initrd_start;
extern unsigned long phys_initrd_size;
@@ -40,17 +37,6 @@ extern unsigned long phys_initrd_size;
*/
static struct meminfo meminfo __initdata = { 0, };
-/*
- * empty_zero_page is a special page that is used for
- * zero-initialized data and COW.
- */
-struct page *empty_zero_page;
-
-/*
- * The pmd table for the upper-most set of pages.
- */
-pmd_t *top_pmd;
-
void show_mem(void)
{
int free = 0, total = 0, reserved = 0;
@@ -173,87 +159,9 @@ static int __init check_initrd(struct meminfo *mi)
return initrd_node;
}
-/*
- * Reserve the various regions of node 0
- */
-static __init void reserve_node_zero(pg_data_t *pgdat)
-{
- unsigned long res_size = 0;
-
- /*
- * Register the kernel text and data with bootmem.
- * Note that this can only be in node 0.
- */
-#ifdef CONFIG_XIP_KERNEL
- reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
-#else
- reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
-#endif
-
- /*
- * Reserve the page tables. These are already in use,
- * and can only be in node 0.
- */
- reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
- PTRS_PER_PGD * sizeof(pgd_t));
-
- /*
- * Hmm... This should go elsewhere, but we really really need to
- * stop things allocating the low memory; ideally we need a better
- * implementation of GFP_DMA which does not assume that DMA-able
- * memory starts at zero.
- */
- if (machine_is_integrator() || machine_is_cintegrator())
- res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
-
- /*
- * These should likewise go elsewhere. They pre-reserve the
- * screen memory region at the start of main system memory.
- */
- if (machine_is_edb7211())
- res_size = 0x00020000;
- if (machine_is_p720t())
- res_size = 0x00014000;
-
-#ifdef CONFIG_SA1111
- /*
- * Because of the SA1111 DMA bug, we want to preserve our
- * precious DMA-able memory...
- */
- res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
-#endif
- if (res_size)
- reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
-}
-
-static inline void prepare_page_table(struct meminfo *mi)
-{
- unsigned long addr;
-
- /*
- * Clear out all the mappings below the kernel image.
- */
- for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-
-#ifdef CONFIG_XIP_KERNEL
- /* The XIP kernel is mapped in the module area -- skip over it */
- addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
-#endif
- for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-
- /*
- * Clear out all the kernel space mappings, except for the first
- * memory bank, up to the end of the vmalloc region.
- */
- for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
- addr < VMALLOC_END; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-}
-
static inline void map_memory_bank(struct membank *bank)
{
+#ifdef CONFIG_MMU
struct map_desc map;
map.pfn = __phys_to_pfn(bank->start);
@@ -262,6 +170,7 @@ static inline void map_memory_bank(struct membank *bank)
map.type = MT_MEMORY;
create_mapping(&map);
+#endif
}
static unsigned long __init
@@ -373,7 +282,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
return end_pfn;
}
-static void __init bootmem_init(struct meminfo *mi)
+void __init bootmem_init(struct meminfo *mi)
{
unsigned long memend_pfn = 0;
int node, initrd_node, i;
@@ -387,8 +296,6 @@ static void __init bootmem_init(struct meminfo *mi)
memcpy(&meminfo, mi, sizeof(meminfo));
- prepare_page_table(mi);
-
/*
* Locate which node contains the ramdisk image, if any.
*/
@@ -422,114 +329,6 @@ static void __init bootmem_init(struct meminfo *mi)
max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
}
-/*
- * Set up device the mappings. Since we clear out the page tables for all
- * mappings above VMALLOC_END, we will remove any debug device mappings.
- * This means you have to be careful how you debug this function, or any
- * called function. This means you can't use any function or debugging
- * method which may touch any device, otherwise the kernel _will_ crash.
- */
-static void __init devicemaps_init(struct machine_desc *mdesc)
-{
- struct map_desc map;
- unsigned long addr;
- void *vectors;
-
- /*
- * Allocate the vector page early.
- */
- vectors = alloc_bootmem_low_pages(PAGE_SIZE);
- BUG_ON(!vectors);
-
- for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
- pmd_clear(pmd_off_k(addr));
-
- /*
- * Map the kernel if it is XIP.
- * It is always first in the modulearea.
- */
-#ifdef CONFIG_XIP_KERNEL
- map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
- map.virtual = MODULE_START;
- map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
- map.type = MT_ROM;
- create_mapping(&map);
-#endif
-
- /*
- * Map the cache flushing regions.
- */
-#ifdef FLUSH_BASE
- map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);
- map.virtual = FLUSH_BASE;
- map.length = SZ_1M;
- map.type = MT_CACHECLEAN;
- create_mapping(&map);
-#endif
-#ifdef FLUSH_BASE_MINICACHE
- map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);
- map.virtual = FLUSH_BASE_MINICACHE;
- map.length = SZ_1M;
- map.type = MT_MINICLEAN;
- create_mapping(&map);
-#endif
-
- /*
- * Create a mapping for the machine vectors at the high-vectors
- * location (0xffff0000). If we aren't using high-vectors, also
- * create a mapping at the low-vectors virtual address.
- */
- map.pfn = __phys_to_pfn(virt_to_phys(vectors));
- map.virtual = 0xffff0000;
- map.length = PAGE_SIZE;
- map.type = MT_HIGH_VECTORS;
- create_mapping(&map);
-
- if (!vectors_high()) {
- map.virtual = 0;
- map.type = MT_LOW_VECTORS;
- create_mapping(&map);
- }
-
- /*
- * Ask the machine support to map in the statically mapped devices.
- */
- if (mdesc->map_io)
- mdesc->map_io();
-
- /*
- * Finally flush the caches and tlb to ensure that we're in a
- * consistent state wrt the writebuffer. This also ensures that
- * any write-allocated cache lines in the vector page are written
- * back. After this point, we can start to touch devices again.
- */
- local_flush_tlb_all();
- flush_cache_all();
-}
-
-/*
- * paging_init() sets up the page tables, initialises the zone memory
- * maps, and sets up the zero page, bad page and bad page tables.
- */
-void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
-{
- void *zero_page;
-
- build_mem_type_table();
- bootmem_init(mi);
- devicemaps_init(mdesc);
-
- top_pmd = pmd_off_k(0xffff0000);
-
- /*
- * allocate the zero page. Note that we count on this going ok.
- */
- zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
- memzero(zero_page, PAGE_SIZE);
- empty_zero_page = virt_to_page(zero_page);
- flush_dcache_page(empty_zero_page);
-}
-
static inline void free_area(unsigned long addr, unsigned long end, char *s)
{
unsigned int size = (end - addr) >> 10;
diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h
index 8d73ffbce8d..083c51d3903 100644
--- a/arch/arm/mm/mm.h
+++ b/arch/arm/mm/mm.h
@@ -14,6 +14,10 @@ static inline pmd_t *pmd_off_k(unsigned long virt)
}
struct map_desc;
+struct meminfo;
+struct pglist_data;
void __init build_mem_type_table(void);
void __init create_mapping(struct map_desc *md);
+void __init bootmem_init(struct meminfo *mi);
+void reserve_node_zero(struct pglist_data *pgdat);
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
new file mode 100644
index 00000000000..9648e6800ff
--- /dev/null
+++ b/arch/arm/mm/mmu.c
@@ -0,0 +1,229 @@
+/*
+ * linux/arch/arm/mm/mmu.c
+ *
+ * Copyright (C) 1995-2005 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+
+#include <asm/mach-types.h>
+#include <asm/setup.h>
+#include <asm/sizes.h>
+#include <asm/tlb.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include "mm.h"
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+extern void _stext, __data_start, _end;
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/*
+ * empty_zero_page is a special page that is used for
+ * zero-initialized data and COW.
+ */
+struct page *empty_zero_page;
+
+/*
+ * The pmd table for the upper-most set of pages.
+ */
+pmd_t *top_pmd;
+
+static inline void prepare_page_table(struct meminfo *mi)
+{
+ unsigned long addr;
+
+ /*
+ * Clear out all the mappings below the kernel image.
+ */
+ for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+#ifdef CONFIG_XIP_KERNEL
+ /* The XIP kernel is mapped in the module area -- skip over it */
+ addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
+#endif
+ for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+ /*
+ * Clear out all the kernel space mappings, except for the first
+ * memory bank, up to the end of the vmalloc region.
+ */
+ for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
+ addr < VMALLOC_END; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+}
+
+/*
+ * Reserve the various regions of node 0
+ */
+void __init reserve_node_zero(pg_data_t *pgdat)
+{
+ unsigned long res_size = 0;
+
+ /*
+ * Register the kernel text and data with bootmem.
+ * Note that this can only be in node 0.
+ */
+#ifdef CONFIG_XIP_KERNEL
+ reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
+#else
+ reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
+#endif
+
+ /*
+ * Reserve the page tables. These are already in use,
+ * and can only be in node 0.
+ */
+ reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
+ PTRS_PER_PGD * sizeof(pgd_t));
+
+ /*
+ * Hmm... This should go elsewhere, but we really really need to
+ * stop things allocating the low memory; ideally we need a better
+ * implementation of GFP_DMA which does not assume that DMA-able
+ * memory starts at zero.
+ */
+ if (machine_is_integrator() || machine_is_cintegrator())
+ res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+
+ /*
+ * These should likewise go elsewhere. They pre-reserve the
+ * screen memory region at the start of main system memory.
+ */
+ if (machine_is_edb7211())
+ res_size = 0x00020000;
+ if (machine_is_p720t())
+ res_size = 0x00014000;
+
+#ifdef CONFIG_SA1111
+ /*
+ * Because of the SA1111 DMA bug, we want to preserve our
+ * precious DMA-able memory...
+ */
+ res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+#endif
+ if (res_size)
+ reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
+}
+
+/*
+ * Set up device the mappings. Since we clear out the page tables for all
+ * mappings above VMALLOC_END, we will remove any debug device mappings.
+ * This means you have to be careful how you debug this function, or any
+ * called function. This means you can't use any function or debugging
+ * method which may touch any device, otherwise the kernel _will_ crash.
+ */
+static void __init devicemaps_init(struct machine_desc *mdesc)
+{
+ struct map_desc map;
+ unsigned long addr;
+ void *vectors;
+
+ /*
+ * Allocate the vector page early.
+ */
+ vectors = alloc_bootmem_low_pages(PAGE_SIZE);
+ BUG_ON(!vectors);
+
+ for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
+ pmd_clear(pmd_off_k(addr));
+
+ /*
+ * Map the kernel if it is XIP.
+ * It is always first in the modulearea.
+ */
+#ifdef CONFIG_XIP_KERNEL
+ map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
+ map.virtual = MODULE_START;
+ map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
+ map.type = MT_ROM;
+ create_mapping(&map);
+#endif
+
+ /*
+ * Map the cache flushing regions.
+ */
+#ifdef FLUSH_BASE
+ map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);
+ map.virtual = FLUSH_BASE;
+ map.length = SZ_1M;
+ map.type = MT_CACHECLEAN;
+ create_mapping(&map);
+#endif
+#ifdef FLUSH_BASE_MINICACHE
+ map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);
+ map.virtual = FLUSH_BASE_MINICACHE;
+ map.length = SZ_1M;
+ map.type = MT_MINICLEAN;
+ create_mapping(&map);
+#endif
+
+ /*
+ * Create a mapping for the machine vectors at the high-vectors
+ * location (0xffff0000). If we aren't using high-vectors, also
+ * create a mapping at the low-vectors virtual address.
+ */
+ map.pfn = __phys_to_pfn(virt_to_phys(vectors));
+ map.virtual = 0xffff0000;
+ map.length = PAGE_SIZE;
+ map.type = MT_HIGH_VECTORS;
+ create_mapping(&map);
+
+ if (!vectors_high()) {
+ map.virtual = 0;
+ map.type = MT_LOW_VECTORS;
+ create_mapping(&map);
+ }
+
+ /*
+ * Ask the machine support to map in the statically mapped devices.
+ */
+ if (mdesc->map_io)
+ mdesc->map_io();
+
+ /*
+ * Finally flush the caches and tlb to ensure that we're in a
+ * consistent state wrt the writebuffer. This also ensures that
+ * any write-allocated cache lines in the vector page are written
+ * back. After this point, we can start to touch devices again.
+ */
+ local_flush_tlb_all();
+ flush_cache_all();
+}
+
+/*
+ * paging_init() sets up the page tables, initialises the zone memory
+ * maps, and sets up the zero page, bad page and bad page tables.
+ */
+void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
+{
+ void *zero_page;
+
+ build_mem_type_table();
+ prepare_page_table(mi);
+ bootmem_init(mi);
+ devicemaps_init(mdesc);
+
+ top_pmd = pmd_off_k(0xffff0000);
+
+ /*
+ * allocate the zero page. Note that we count on this going ok.
+ */
+ zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
+ memzero(zero_page, PAGE_SIZE);
+ empty_zero_page = virt_to_page(zero_page);
+ flush_dcache_page(empty_zero_page);
+}
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
index 1464ed817b5..e369aeb0c25 100644
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -11,6 +11,42 @@
#include <asm/io.h>
#include <asm/page.h>
+#include "mm.h"
+
+extern void _stext, __data_start, _end;
+
+/*
+ * Reserve the various regions of node 0
+ */
+void __init reserve_node_zero(pg_data_t *pgdat)
+{
+ /*
+ * Register the kernel text and data with bootmem.
+ * Note that this can only be in node 0.
+ */
+#ifdef CONFIG_XIP_KERNEL
+ reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
+#else
+ reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
+#endif
+
+ /*
+ * Register the exception vector page.
+ * some architectures which the DRAM is the exception vector to trap,
+ * alloc_page breaks with error, although it is not NULL, but "0."
+ */
+ reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE);
+}
+
+/*
+ * paging_init() sets up the page tables, initialises the zone memory
+ * maps, and sets up the zero page, bad page and bad page tables.
+ */
+void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
+{
+ bootmem_init(mi);
+}
+
void flush_dcache_page(struct page *page)
{
__cpuc_flush_dcache_page(page_address(page));
--
cgit v1.2.3-70-g09d2