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m68k: print memory layout info in boot log 

Output a table of the kernel memory regions at boot time.
This is taken directly from the ARM architecture code that does this.
The table looks like this:

Virtual kernel memory layout:
    vector  : 0x00000000 - 0x00000400   (   0 KiB)
    kmap    : 0xd0000000 - 0xe0000000   ( 256 MiB)
    vmalloc : 0xc0000000 - 0xcfffffff   ( 255 MiB)
    lowmem  : 0x00000000 - 0x02000000   (  32 MiB)
      .init : 0x00128000 - 0x00134000   (  48 KiB)
      .text : 0x00020000 - 0x00118d54   ( 996 KiB)
      .data : 0x00118d60 - 0x00126000   (  53 KiB)
      .bss  : 0x00134000 - 0x001413e0   (  53 KiB)

This has been very useful while debugging the ColdFire virtual memory
support code. But in general I think it is nice to know extacly where
the kernel has layed everything out on boot.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2011-10-13 16:59:55 +10:00
parent 361a541dc2
commit e87c09a899
4 changed files with 39 additions and 0 deletions
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1
arch/m68k/include/asm/traps.h
View File

@ -18,6 +18,7 @@
typedef void (*e_vector)(void);
extern e_vector vectors[];
extern e_vector *_ramvec;
asmlinkage void auto_inthandler(void);
asmlinkage void user_inthandler(void);

2
arch/m68k/kernel/vmlinux-std.lds
View File

@ -31,7 +31,9 @@ SECTIONS
RW_DATA_SECTION(16, PAGE_SIZE, THREAD_SIZE)
_sbss = .;
BSS_SECTION(0, 0, 0)
_ebss = .;
_edata = .; /* End of data section */

2
arch/m68k/kernel/vmlinux-sun3.lds
View File

@ -44,7 +44,9 @@ __init_begin = .;
. = ALIGN(PAGE_SIZE);
__init_end = .;
_sbss = .;
BSS_SECTION(0, 0, 0)
_ebss = .;
_end = . ;

34
arch/m68k/mm/init_mm.c
View File

@ -24,6 +24,7 @@
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/io.h>
#ifdef CONFIG_ATARI
@ -75,6 +76,38 @@ extern void init_pointer_table(unsigned long ptable);
extern pmd_t *zero_pgtable;
#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
#define VECTORS &vectors[0]
#else
#define VECTORS _ramvec
#endif
void __init print_memmap(void)
{
#define UL(x) ((unsigned long) (x))
#define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
#define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
pr_notice("Virtual kernel memory layout:\n"
" vector : 0x%08lx - 0x%08lx (%4ld KiB)\n"
" kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n"
" vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n"
" lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n"
" .init : 0x%p" " - 0x%p" " (%4d KiB)\n"
" .text : 0x%p" " - 0x%p" " (%4d KiB)\n"
" .data : 0x%p" " - 0x%p" " (%4d KiB)\n"
" .bss : 0x%p" " - 0x%p" " (%4d KiB)\n",
MLK(VECTORS, VECTORS + 256),
MLM(KMAP_START, KMAP_END),
MLM(VMALLOC_START, VMALLOC_END),
MLM(PAGE_OFFSET, (unsigned long)high_memory),
MLK_ROUNDUP(__init_begin, __init_end),
MLK_ROUNDUP(_stext, _etext),
MLK_ROUNDUP(_sdata, _edata),
MLK_ROUNDUP(_sbss, _ebss));
}
void __init mem_init(void)
{
pg_data_t *pgdat;
@ -125,6 +158,7 @@ void __init mem_init(void)
codepages << (PAGE_SHIFT-10),
datapages << (PAGE_SHIFT-10),
initpages << (PAGE_SHIFT-10));
print_memmap();
}
#ifdef CONFIG_BLK_DEV_INITRD