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Subject[PATCH 4/5] i386 create e820.c to handle memmap table walking
This patch moves e820/efi memmap table walking function from 
setup.c to e820.c, also this patch adds extern declaration in
header file.

Signed-off-by: bibo,mao <bibo.mao@intel.com>

arch/i386/kernel/e820.c | 115 +++++++++++++++++++++++++++++++++
arch/i386/kernel/setup.c | 118 -----------------------------------
include/asm-i386/e820.h | 2
3 files changed, 117 insertions(+), 118 deletions(-)
------------------------------------------------------

diff -Nrup -X 2.6.19-rc2-mm2.org/Documentation/dontdiff 2.6.19-rc2-mm2.org/arch/i386/kernel/e820.c 2.6.19-rc2-mm2/arch/i386/kernel/e820.c
--- 2.6.19-rc2-mm2.org/arch/i386/kernel/e820.c 2006-10-26 16:27:59.000000000 +0800
+++ 2.6.19-rc2-mm2/arch/i386/kernel/e820.c 2006-10-26 16:27:48.000000000 +0800
@@ -28,6 +28,11 @@ static struct change_member change_point
static struct change_member *change_point[2*E820MAX] __initdata;
static struct e820entry *overlap_list[E820MAX] __initdata;
static struct e820entry new_bios[E820MAX] __initdata;
+/* For PCI or other memory-mapped resources */
+unsigned long pci_mem_start = 0x10000000;
+#ifdef CONFIG_PCI
+EXPORT_SYMBOL(pci_mem_start);
+#endif
struct resource data_resource = {
.name = "Kernel data",
.start = 0,
@@ -591,3 +596,113 @@ void __init find_max_pfn(void)
memory_present(0, start, end);
}
}
+
+/*
+ * Free all available memory for boot time allocation. Used
+ * as a callback function by efi_memory_walk()
+ */
+
+static int __init
+free_available_memory(unsigned long start, unsigned long end, void *arg)
+{
+ /* check max_low_pfn */
+ if (start >= (max_low_pfn << PAGE_SHIFT))
+ return 0;
+ if (end >= (max_low_pfn << PAGE_SHIFT))
+ end = max_low_pfn << PAGE_SHIFT;
+ if (start < end)
+ free_bootmem(start, end - start);
+
+ return 0;
+}
+/*
+ * Register fully available low RAM pages with the bootmem allocator.
+ */
+void __init register_bootmem_low_pages(unsigned long max_low_pfn)
+{
+ int i;
+
+ if (efi_enabled) {
+ efi_memmap_walk(free_available_memory, NULL);
+ return;
+ }
+ for (i = 0; i < e820.nr_map; i++) {
+ unsigned long curr_pfn, last_pfn, size;
+ /*
+ * Reserve usable low memory
+ */
+ if (e820.map[i].type != E820_RAM)
+ continue;
+ /*
+ * We are rounding up the start address of usable memory:
+ */
+ curr_pfn = PFN_UP(e820.map[i].addr);
+ if (curr_pfn >= max_low_pfn)
+ continue;
+ /*
+ * ... and at the end of the usable range downwards:
+ */
+ last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
+
+ if (last_pfn > max_low_pfn)
+ last_pfn = max_low_pfn;
+
+ /*
+ * .. finally, did all the rounding and playing
+ * around just make the area go away?
+ */
+ if (last_pfn <= curr_pfn)
+ continue;
+
+ size = last_pfn - curr_pfn;
+ free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
+ }
+}
+
+void __init register_memory(void)
+{
+ unsigned long gapstart, gapsize, round;
+ unsigned long long last;
+ int i;
+
+ /*
+ * Search for the bigest gap in the low 32 bits of the e820
+ * memory space.
+ */
+ last = 0x100000000ull;
+ gapstart = 0x10000000;
+ gapsize = 0x400000;
+ i = e820.nr_map;
+ while (--i >= 0) {
+ unsigned long long start = e820.map[i].addr;
+ unsigned long long end = start + e820.map[i].size;
+
+ /*
+ * Since "last" is at most 4GB, we know we'll
+ * fit in 32 bits if this condition is true
+ */
+ if (last > end) {
+ unsigned long gap = last - end;
+
+ if (gap > gapsize) {
+ gapsize = gap;
+ gapstart = end;
+ }
+ }
+ if (start < last)
+ last = start;
+ }
+
+ /*
+ * See how much we want to round up: start off with
+ * rounding to the next 1MB area.
+ */
+ round = 0x100000;
+ while ((gapsize >> 4) > round)
+ round += round;
+ /* Fun with two's complement */
+ pci_mem_start = (gapstart + round) & -round;
+
+ printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
+ pci_mem_start, gapstart, gapsize);
+}
diff -Nrup -X 2.6.19-rc2-mm2.org/Documentation/dontdiff 2.6.19-rc2-mm2.org/arch/i386/kernel/setup.c 2.6.19-rc2-mm2/arch/i386/kernel/setup.c
--- 2.6.19-rc2-mm2.org/arch/i386/kernel/setup.c 2006-10-26 16:27:59.000000000 +0800
+++ 2.6.19-rc2-mm2/arch/i386/kernel/setup.c 2006-10-26 16:27:48.000000000 +0800
@@ -94,12 +94,6 @@ unsigned int machine_submodel_id;
unsigned int BIOS_revision;
unsigned int mca_pentium_flag;

-/* For PCI or other memory-mapped resources */
-unsigned long pci_mem_start = 0x10000000;
-#ifdef CONFIG_PCI
-EXPORT_SYMBOL(pci_mem_start);
-#endif
-
/* Boot loader ID as an integer, for the benefit of proc_dointvec */
int bootloader_type;

@@ -481,68 +475,6 @@ unsigned long __init find_max_low_pfn(vo
}

/*
- * Free all available memory for boot time allocation. Used
- * as a callback function by efi_memory_walk()
- */
-
-static int __init
-free_available_memory(unsigned long start, unsigned long end, void *arg)
-{
- /* check max_low_pfn */
- if (start >= (max_low_pfn << PAGE_SHIFT))
- return 0;
- if (end >= (max_low_pfn << PAGE_SHIFT))
- end = max_low_pfn << PAGE_SHIFT;
- if (start < end)
- free_bootmem(start, end - start);
-
- return 0;
-}
-/*
- * Register fully available low RAM pages with the bootmem allocator.
- */
-static void __init register_bootmem_low_pages(unsigned long max_low_pfn)
-{
- int i;
-
- if (efi_enabled) {
- efi_memmap_walk(free_available_memory, NULL);
- return;
- }
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long curr_pfn, last_pfn, size;
- /*
- * Reserve usable low memory
- */
- if (e820.map[i].type != E820_RAM)
- continue;
- /*
- * We are rounding up the start address of usable memory:
- */
- curr_pfn = PFN_UP(e820.map[i].addr);
- if (curr_pfn >= max_low_pfn)
- continue;
- /*
- * ... and at the end of the usable range downwards:
- */
- last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
-
- if (last_pfn > max_low_pfn)
- last_pfn = max_low_pfn;
-
- /*
- * .. finally, did all the rounding and playing
- * around just make the area go away?
- */
- if (last_pfn <= curr_pfn)
- continue;
-
- size = last_pfn - curr_pfn;
- free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
- }
-}
-
-/*
* workaround for Dell systems that neglect to reserve EBDA
*/
static void __init reserve_ebda_region(void)
@@ -710,56 +642,6 @@ void __init remapped_pgdat_init(void)
}
}

-
-
-static void __init register_memory(void)
-{
- unsigned long gapstart, gapsize, round;
- unsigned long long last;
- int i;
-
- /*
- * Search for the bigest gap in the low 32 bits of the e820
- * memory space.
- */
- last = 0x100000000ull;
- gapstart = 0x10000000;
- gapsize = 0x400000;
- i = e820.nr_map;
- while (--i >= 0) {
- unsigned long long start = e820.map[i].addr;
- unsigned long long end = start + e820.map[i].size;
-
- /*
- * Since "last" is at most 4GB, we know we'll
- * fit in 32 bits if this condition is true
- */
- if (last > end) {
- unsigned long gap = last - end;
-
- if (gap > gapsize) {
- gapsize = gap;
- gapstart = end;
- }
- }
- if (start < last)
- last = start;
- }
-
- /*
- * See how much we want to round up: start off with
- * rounding to the next 1MB area.
- */
- round = 0x100000;
- while ((gapsize >> 4) > round)
- round += round;
- /* Fun with two's complement */
- pci_mem_start = (gapstart + round) & -round;
-
- printk("Allocating PCI resources starting at %08lx (gap: %08lx:%08lx)\n",
- pci_mem_start, gapstart, gapsize);
-}
-
#ifdef CONFIG_MCA
static void set_mca_bus(int x)
{
diff -Nrup -X 2.6.19-rc2-mm2.org/Documentation/dontdiff 2.6.19-rc2-mm2.org/include/asm-i386/e820.h 2.6.19-rc2-mm2/include/asm-i386/e820.h
--- 2.6.19-rc2-mm2.org/include/asm-i386/e820.h 2006-10-26 16:27:59.000000000 +0800
+++ 2.6.19-rc2-mm2/include/asm-i386/e820.h 2006-10-26 16:29:45.000000000 +0800
@@ -39,6 +39,8 @@ extern struct e820map e820;
extern int e820_all_mapped(unsigned long start, unsigned long end,
unsigned type);
extern void find_max_pfn(void);
+extern void register_bootmem_low_pages(unsigned long max_low_pfn);
+extern void register_memory(void);

#endif/*!__ASSEMBLY__*/

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