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Date: Tue, 17 Jun 2008 09:31:03 -0300
From: "Glauber Costa" <glommer@...il.com>
To: "Yinghai Lu" <yhlu.kernel@...il.com>
Cc: "Ingo Molnar" <mingo@...e.hu>,
"Thomas Gleixner" <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: merge setup_memory_map with e820
On Mon, Jun 16, 2008 at 11:58 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
> and kill e820_32/64.c and e820_32/64.h
>
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>
> Index: linux-2.6/arch/x86/mm/init_64.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/mm/init_64.c
> +++ linux-2.6/arch/x86/mm/init_64.c
> @@ -48,6 +48,18 @@
> #include <asm/numa.h>
> #include <asm/cacheflush.h>
>
> +/*
> + * PFN of last memory page.
> + */
> +unsigned long end_pfn;
> +
> +/*
> + * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
> + * The direct mapping extends to max_pfn_mapped, so that we can directly access
> + * apertures, ACPI and other tables without having to play with fixmaps.
> + */
> +unsigned long max_pfn_mapped;
> +
> static unsigned long dma_reserve __initdata;
>
> DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
> Index: linux-2.6/arch/x86/kernel/setup_64.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/setup_64.c
> +++ linux-2.6/arch/x86/kernel/setup_64.c
> @@ -281,12 +281,6 @@ static inline void __init reserve_crashk
> {}
> #endif
>
> -/* Overridden in paravirt.c if CONFIG_PARAVIRT */
> -void __attribute__((weak)) __init memory_setup(void)
> -{
> - machine_specific_memory_setup();
> -}
> -
> /* Current gdt points %fs at the "master" per-cpu area: after this,
> * it's on the real one. */
> void switch_to_new_gdt(void)
> @@ -330,7 +324,7 @@ void __init setup_arch(char **cmdline_p)
>
> ARCH_SETUP
>
> - memory_setup();
> + setup_memory_map();
> copy_edd();
>
> if (!boot_params.hdr.root_flags)
> Index: linux-2.6/arch/x86/kernel/e820_64.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/e820_64.c
> +++ /dev/null
> @@ -1,92 +0,0 @@
> -/*
> - * Handle the memory map.
> - * The functions here do the job until bootmem takes over.
> - *
> - * Getting sanitize_e820_map() in sync with i386 version by applying change:
> - * - Provisions for empty E820 memory regions (reported by certain BIOSes).
> - * Alex Achenbach <xela@...t.de>, December 2002.
> - * Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> - *
> - */
> -#include <linux/kernel.h>
> -#include <linux/types.h>
> -#include <linux/init.h>
> -#include <linux/bootmem.h>
> -#include <linux/ioport.h>
> -#include <linux/string.h>
> -#include <linux/kexec.h>
> -#include <linux/module.h>
> -#include <linux/mm.h>
> -#include <linux/pfn.h>
> -#include <linux/pci.h>
> -
> -#include <asm/pgtable.h>
> -#include <asm/page.h>
> -#include <asm/e820.h>
> -#include <asm/proto.h>
> -#include <asm/setup.h>
> -#include <asm/sections.h>
> -#include <asm/kdebug.h>
> -#include <asm/trampoline.h>
> -
> -/*
> - * PFN of last memory page.
> - */
> -unsigned long end_pfn;
> -
> -/*
> - * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
> - * The direct mapping extends to max_pfn_mapped, so that we can directly access
> - * apertures, ACPI and other tables without having to play with fixmaps.
> - */
> -unsigned long max_pfn_mapped;
> -
> -static void early_panic(char *msg)
> -{
> - early_printk(msg);
> - panic(msg);
> -}
> -
> -/* We're not void only for x86 32-bit compat */
> -char *__init machine_specific_memory_setup(void)
> -{
> - char *who = "BIOS-e820";
> - int new_nr;
> - /*
> - * Try to copy the BIOS-supplied E820-map.
> - *
> - * Otherwise fake a memory map; one section from 0k->640k,
> - * the next section from 1mb->appropriate_mem_k
> - */
> - new_nr = boot_params.e820_entries;
> - sanitize_e820_map(boot_params.e820_map,
> - ARRAY_SIZE(boot_params.e820_map),
> - &new_nr);
> - boot_params.e820_entries = new_nr;
> - if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries) < 0)
> - early_panic("Cannot find a valid memory map");
> - printk(KERN_INFO "BIOS-provided physical RAM map:\n");
> - e820_print_map(who);
> -
> - /* In case someone cares... */
> - return who;
> -}
> -
> -int __init arch_get_ram_range(int slot, u64 *addr, u64 *size)
> -{
> - int i;
> -
> - if (slot < 0 || slot >= e820.nr_map)
> - return -1;
> - for (i = slot; i < e820.nr_map; i++) {
> - if (e820.map[i].type != E820_RAM)
> - continue;
> - break;
> - }
> - if (i == e820.nr_map || e820.map[i].addr > (max_pfn << PAGE_SHIFT))
> - return -1;
> - *addr = e820.map[i].addr;
> - *size = min_t(u64, e820.map[i].size + e820.map[i].addr,
> - max_pfn << PAGE_SHIFT) - *addr;
> - return i + 1;
> -}
> Index: linux-2.6/arch/x86/kernel/e820_32.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/e820_32.c
> +++ /dev/null
> @@ -1,29 +0,0 @@
> -#include <linux/kernel.h>
> -#include <linux/types.h>
> -#include <linux/init.h>
> -#include <linux/bootmem.h>
> -#include <linux/ioport.h>
> -#include <linux/string.h>
> -#include <linux/kexec.h>
> -#include <linux/module.h>
> -#include <linux/mm.h>
> -#include <linux/pfn.h>
> -#include <linux/uaccess.h>
> -
> -#include <asm/pgtable.h>
> -#include <asm/page.h>
> -#include <asm/e820.h>
> -#include <asm/setup.h>
> -
> -/* Overridden in paravirt.c if CONFIG_PARAVIRT */
> -char * __init __attribute__((weak)) memory_setup(void)
> -{
> - return machine_specific_memory_setup();
> -}
> -
> -void __init setup_memory_map(void)
> -{
> - printk(KERN_INFO "BIOS-provided physical RAM map:\n");
> - e820_print_map(memory_setup());
> -}
> -
> Index: linux-2.6/arch/x86/kernel/e820.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/e820.c
> +++ linux-2.6/arch/x86/kernel/e820.c
> @@ -996,4 +996,76 @@ void __init e820_reserve_resources(void)
> }
> }
>
> +char *__init __attribute__((weak)) machine_specific_memory_setup(void)
> +{
> + char *who = "BIOS-e820";
> + int new_nr;
> + /*
> + * Try to copy the BIOS-supplied E820-map.
> + *
> + * Otherwise fake a memory map; one section from 0k->640k,
> + * the next section from 1mb->appropriate_mem_k
> + */
> + new_nr = boot_params.e820_entries;
> + sanitize_e820_map(boot_params.e820_map,
> + ARRAY_SIZE(boot_params.e820_map),
> + &new_nr);
> + boot_params.e820_entries = new_nr;
> + if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries) < 0) {
> +#ifdef CONFIG_X86_64
> + early_panic("Cannot find a valid memory map");
> +#else
Can't this be made dependant on HIGHMEM instead of X86_64? It seems
high-memory dependant anyway. Also, are you sure
this code that maps into himem would work with HIGHMEM disabled anyway?
> + unsigned long mem_size;
>
> + /* compare results from other methods and take the greater */
> + if (boot_params.alt_mem_k
> + < boot_params.screen_info.ext_mem_k) {
> + mem_size = boot_params.screen_info.ext_mem_k;
> + who = "BIOS-88";
> + } else {
> + mem_size = boot_params.alt_mem_k;
> + who = "BIOS-e801";
> + }
> +
> + e820.nr_map = 0;
> + e820_add_region(0, LOWMEMSIZE(), E820_RAM);
> + e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
> +#endif
> + }
> +
> + /* In case someone cares... */
> + return who;
> +}
> +
> +/* Overridden in paravirt.c if CONFIG_PARAVIRT */
> +char * __init __attribute__((weak)) memory_setup(void)
> +{
> + return machine_specific_memory_setup();
> +}
> +
> +void __init setup_memory_map(void)
> +{
> + printk(KERN_INFO "BIOS-provided physical RAM map:\n");
> + e820_print_map(memory_setup());
> +}
> +
> +#ifdef CONFIG_X86_64
> +int __init arch_get_ram_range(int slot, u64 *addr, u64 *size)
> +{
> + int i;
> +
> + if (slot < 0 || slot >= e820.nr_map)
> + return -1;
> + for (i = slot; i < e820.nr_map; i++) {
> + if (e820.map[i].type != E820_RAM)
> + continue;
> + break;
> + }
> + if (i == e820.nr_map || e820.map[i].addr > (max_pfn << PAGE_SHIFT))
> + return -1;
> + *addr = e820.map[i].addr;
> + *size = min_t(u64, e820.map[i].size + e820.map[i].addr,
> + max_pfn << PAGE_SHIFT) - *addr;
> + return i + 1;
> +}
> +#endif
> Index: linux-2.6/include/asm-x86/e820_32.h
> ===================================================================
> --- linux-2.6.orig/include/asm-x86/e820_32.h
> +++ /dev/null
> @@ -1,24 +0,0 @@
> -/*
> - * structures and definitions for the int 15, ax=e820 memory map
> - * scheme.
> - *
> - * In a nutshell, arch/i386/boot/setup.S populates a scratch table
> - * in the empty_zero_block that contains a list of usable address/size
> - * duples. In arch/i386/kernel/setup.c, this information is
> - * transferred into the e820map, and in arch/i386/mm/init.c, that
> - * new information is used to mark pages reserved or not.
> - *
> - */
> -#ifndef __E820_HEADER
> -#define __E820_HEADER
> -
> -#include <linux/ioport.h>
> -
> -#define HIGH_MEMORY (1024*1024)
> -
> -#ifndef __ASSEMBLY__
> -
> -extern void setup_memory_map(void);
> -
> -#endif/*!__ASSEMBLY__*/
> -#endif/*__E820_HEADER*/
> Index: linux-2.6/include/asm-x86/e820_64.h
> ===================================================================
> --- linux-2.6.orig/include/asm-x86/e820_64.h
> +++ /dev/null
> @@ -1,26 +0,0 @@
> -/*
> - * structures and definitions for the int 15, ax=e820 memory map
> - * scheme.
> - *
> - * In a nutshell, setup.S populates a scratch table in the
> - * empty_zero_block that contains a list of usable address/size
> - * duples. setup.c, this information is transferred into the e820map,
> - * and in init.c/numa.c, that new information is used to mark pages
> - * reserved or not.
> - */
> -#ifndef __E820_HEADER
> -#define __E820_HEADER
> -
> -#include <linux/ioport.h>
> -
> -#ifndef __ASSEMBLY__
> -extern void setup_memory_region(void);
> -extern void contig_e820_setup(void);
> -extern int e820_any_non_reserved(unsigned long start, unsigned long end);
> -extern int is_memory_any_valid(unsigned long start, unsigned long end);
> -extern int e820_all_non_reserved(unsigned long start, unsigned long end);
> -extern int is_memory_all_valid(unsigned long start, unsigned long end);
> -
> -#endif/*!__ASSEMBLY__*/
> -
> -#endif/*__E820_HEADER*/
> Index: linux-2.6/include/asm-x86/e820.h
> ===================================================================
> --- linux-2.6.orig/include/asm-x86/e820.h
> +++ linux-2.6/include/asm-x86/e820.h
> @@ -99,6 +99,9 @@ extern void e820_register_active_regions
> extern u64 e820_hole_size(u64 start, u64 end);
> extern void finish_e820_parsing(void);
> extern void e820_reserve_resources(void);
> +extern void setup_memory_map(void);
> +extern char *machine_specific_memory_setup(void);
> +extern char *memory_setup(void);
>
> #endif /* __ASSEMBLY__ */
>
> @@ -109,10 +112,10 @@ extern void e820_reserve_resources(void)
> #define BIOS_END 0x00100000
>
> #ifdef __KERNEL__
> +#include <linux/ioport.h>
> +
> #ifdef CONFIG_X86_32
> -# include "e820_32.h"
> -#else
> -# include "e820_64.h"
> +#define HIGH_MEMORY (1024*1024)
> #endif
> #endif /* __KERNEL__ */
>
> Index: linux-2.6/arch/x86/mach-default/setup.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/mach-default/setup.c
> +++ linux-2.6/arch/x86/mach-default/setup.c
> @@ -142,50 +142,3 @@ static int __init print_ipi_mode(void)
>
> late_initcall(print_ipi_mode);
>
> -/**
> - * machine_specific_memory_setup - Hook for machine specific memory setup.
> - *
> - * Description:
> - * This is included late in kernel/setup.c so that it can make
> - * use of all of the static functions.
> - **/
> -
> -char * __init machine_specific_memory_setup(void)
> -{
> - char *who;
> - int new_nr;
> -
> -
> - who = "BIOS-e820";
> -
> - /*
> - * Try to copy the BIOS-supplied E820-map.
> - *
> - * Otherwise fake a memory map; one section from 0k->640k,
> - * the next section from 1mb->appropriate_mem_k
> - */
> - new_nr = boot_params.e820_entries;
> - sanitize_e820_map(boot_params.e820_map,
> - ARRAY_SIZE(boot_params.e820_map),
> - &new_nr);
> - boot_params.e820_entries = new_nr;
> - if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries)
> - < 0) {
> - unsigned long mem_size;
> -
> - /* compare results from other methods and take the greater */
> - if (boot_params.alt_mem_k
> - < boot_params.screen_info.ext_mem_k) {
> - mem_size = boot_params.screen_info.ext_mem_k;
> - who = "BIOS-88";
> - } else {
> - mem_size = boot_params.alt_mem_k;
> - who = "BIOS-e801";
> - }
> -
> - e820.nr_map = 0;
> - e820_add_region(0, LOWMEMSIZE(), E820_RAM);
> - e820_add_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
> - }
> - return who;
> -}
> Index: linux-2.6/include/asm-x86/setup.h
> ===================================================================
> --- linux-2.6.orig/include/asm-x86/setup.h
> +++ linux-2.6/include/asm-x86/setup.h
> @@ -8,7 +8,6 @@
> /* Interrupt control for vSMPowered x86_64 systems */
> void vsmp_init(void);
>
> -char *machine_specific_memory_setup(void);
> #ifndef CONFIG_PARAVIRT
> #define paravirt_post_allocator_init() do {} while (0)
> #endif
> @@ -50,10 +49,6 @@ extern struct boot_params boot_params;
> */
> #define LOWMEMSIZE() (0x9f000)
>
> -char * __init machine_specific_memory_setup(void);
> -char *memory_setup(void);
> -
> -
> void __init i386_start_kernel(void);
>
> extern unsigned long init_pg_tables_start;
> Index: linux-2.6/arch/x86/kernel/Makefile
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/Makefile
> +++ linux-2.6/arch/x86/kernel/Makefile
> @@ -30,7 +30,7 @@ obj-y += setup_$(BITS).o i8259.o irqin
> obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o
> obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
> obj-$(CONFIG_X86_64) += syscall_64.o vsyscall_64.o setup64.o
> -obj-y += bootflag.o e820_$(BITS).o e820.o
> +obj-y += bootflag.o e820.o
> obj-y += pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
> obj-y += alternative.o i8253.o pci-nommu.o
> obj-y += tsc_$(BITS).o io_delay.o rtc.o
> --
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>
--
Glauber Costa.
"Free as in Freedom"
http://glommer.net
"The less confident you are, the more serious you have to act."
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