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Subject[PATCH] x86_32: trim memory by updating e820 v2
[PATCH] x86_32: trim memory by updating e820 v2

when mtrr is not covering all e820 table, need to trim the ram, need to update e820

reuse some code for x86_64

here need to add early_identify_cpu for x86_32, and move mtrr_bp_init early

compiled test only, need someone test it


Index: linux-2.6/arch/x86/kernel/cpu/common.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/common.c
+++ linux-2.6/arch/x86/kernel/cpu/common.c
@@ -396,11 +396,9 @@ __setup("serialnumber", x86_serial_nr_se
/*
* This does the hard work of actually picking apart the CPU stuff...
*/
-void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
+void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
{
- int i;

- c->loops_per_jiffy = loops_per_jiffy;
c->x86_cache_size = -1;
c->x86_vendor = X86_VENDOR_UNKNOWN;
c->cpuid_level = -1; /* CPUID not detected */
@@ -424,7 +422,14 @@ void __cpuinit identify_cpu(struct cpuin

if (this_cpu->c_identify)
this_cpu->c_identify(c);
+}

+void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
+{
+ int i;
+
+ c->loops_per_jiffy = loops_per_jiffy;
+ early_identify_cpu(c);
/*
* Vendor-specific initialization. In this section we
* canonicalize the feature flags, meaning if there are
@@ -485,7 +490,6 @@ void __init identify_boot_cpu(void)
identify_cpu(&boot_cpu_data);
sysenter_setup();
enable_sep_cpu();
- mtrr_bp_init();
}

void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
Index: linux-2.6/arch/x86/kernel/setup_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_32.c
+++ linux-2.6/arch/x86/kernel/setup_32.c
@@ -49,6 +49,7 @@

#include <video/edid.h>

+#include <asm/mtrr.h>
#include <asm/apic.h>
#include <asm/e820.h>
#include <asm/mpspec.h>
@@ -747,6 +748,7 @@ void __init setup_arch(char **cmdline_p)
bss_resource.start = virt_to_phys(&__bss_start);
bss_resource.end = virt_to_phys(&__bss_stop)-1;

+ early_identify_cpu(&boot_cpu_data);
parse_early_param();

if (user_defined_memmap) {
@@ -762,6 +764,12 @@ void __init setup_arch(char **cmdline_p)

max_low_pfn = setup_memory();

+ /* update e820 for memory not covered by WB MTRRs */
+ mtrr_bp_init();
+ if (mtrr_trim_uncached_memory(max_pfn)) {
+ max_low_pfn = setup_memory();
+ }
+
#ifdef CONFIG_VMI
/*
* Must be after max_low_pfn is determined, and before kernel
Index: linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/mtrr/main.c
+++ linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
@@ -624,7 +624,6 @@ static struct sysdev_driver mtrr_sysdev_
.resume = mtrr_restore,
};

-#ifdef CONFIG_X86_64
static int disable_mtrr_trim;

static int __init disable_mtrr_trim_setup(char *str)
@@ -726,7 +725,6 @@ int __init mtrr_trim_uncached_memory(uns

return 0;
}
-#endif

/**
* mtrr_bp_init - initialize mtrrs on the boot CPU
Index: linux-2.6/Documentation/kernel-parameters.txt
===================================================================
--- linux-2.6.orig/Documentation/kernel-parameters.txt
+++ linux-2.6/Documentation/kernel-parameters.txt
@@ -575,7 +575,7 @@ and is between 256 and 4096 characters.
See drivers/char/README.epca and
Documentation/digiepca.txt.

- disable_mtrr_trim [X86-64, Intel only]
+ disable_mtrr_trim [X86, Intel and AMD only]
By default the kernel will trim any uncacheable
memory out of your available memory pool based on
MTRR settings. This parameter disables that behavior,
Index: linux-2.6/include/asm-x86/processor.h
===================================================================
--- linux-2.6.orig/include/asm-x86/processor.h
+++ linux-2.6/include/asm-x86/processor.h
@@ -131,6 +131,7 @@ DECLARE_PER_CPU(struct cpuinfo_x86, cpu_

void cpu_detect(struct cpuinfo_x86 *c);

+extern void early_identify_cpu(struct cpuinfo_x86 *);
extern void identify_cpu(struct cpuinfo_x86 *);
extern void identify_boot_cpu(void);
extern void identify_secondary_cpu(struct cpuinfo_x86 *);
Index: linux-2.6/arch/x86/kernel/e820_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820_32.c
+++ linux-2.6/arch/x86/kernel/e820_32.c
@@ -827,3 +827,14 @@ static int __init parse_memmap(char *arg
return 0;
}
early_param("memmap", parse_memmap);
+void __init update_e820(void)
+{
+ u8 nr_map;
+
+ nr_map = e820.nr_map;
+ if (sanitize_e820_map(e820.map, &nr_map))
+ return;
+ e820.nr_map = nr_map;
+ printk(KERN_INFO "modified physical RAM map:\n");
+ print_memory_map("modified");
+}
Index: linux-2.6/include/asm-x86/e820_32.h
===================================================================
--- linux-2.6.orig/include/asm-x86/e820_32.h
+++ linux-2.6/include/asm-x86/e820_32.h
@@ -19,6 +19,7 @@
#ifndef __ASSEMBLY__

extern struct e820map e820;
+extern void update_e820(void);

extern int e820_all_mapped(u64 start, u64 end, unsigned type);
extern int e820_any_mapped(u64 start, u64 end, unsigned type);
@@ -29,6 +30,8 @@ extern int is_memory_all_valid(u64 start
extern int is_memory_all_reserved(u64 start, u64 end);
extern void find_max_pfn(void);
extern void register_bootmem_low_pages(unsigned long max_low_pfn);
+extern void add_memory_region(unsigned long long start,
+ unsigned long long size, int type);
extern void e820_register_memory(void);
extern void limit_regions(unsigned long long size);
extern void print_memory_map(char *who);
--- a/arch/x86/kernel/setup_64.c 2008-01-20 22:00:46.000000000 -0800
+++ b/arch/x86/kernel/setup_64.c 2008-01-20 22:01:21.000000000 -0800
@@ -158,8 +158,6 @@
.flags = IORESOURCE_RAM,
};

-static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c);
-
#ifdef CONFIG_PROC_VMCORE
/* elfcorehdr= specifies the location of elf core header
* stored by the crashed kernel. This option will be passed
@@ -891,7 +889,7 @@
/* Do some early cpuid on the boot CPU to get some parameter that are
needed before check_bugs. Everything advanced is in identify_cpu
below. */
-static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
+void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
{
u32 tfms, xlvl;


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