From: Greg Ungerer Date: Thu, 13 Oct 2011 06:59:55 +0000 (+1000) Subject: m68k: print memory layout info in boot log X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e87c09a899d38d1b6858e010c22a1200fb77965d;p=linux-beck.git 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 --- diff --git a/arch/m68k/include/asm/traps.h b/arch/m68k/include/asm/traps.h index 151068f64f44..4aff3358fbaf 100644 --- a/arch/m68k/include/asm/traps.h +++ b/arch/m68k/include/asm/traps.h @@ -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); diff --git a/arch/m68k/kernel/vmlinux-std.lds b/arch/m68k/kernel/vmlinux-std.lds index d0993594f558..63407c836826 100644 --- a/arch/m68k/kernel/vmlinux-std.lds +++ b/arch/m68k/kernel/vmlinux-std.lds @@ -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 */ diff --git a/arch/m68k/kernel/vmlinux-sun3.lds b/arch/m68k/kernel/vmlinux-sun3.lds index 8080469ee6c1..ad0f46d64c0b 100644 --- a/arch/m68k/kernel/vmlinux-sun3.lds +++ b/arch/m68k/kernel/vmlinux-sun3.lds @@ -44,7 +44,9 @@ __init_begin = .; . = ALIGN(PAGE_SIZE); __init_end = .; + _sbss = .; BSS_SECTION(0, 0, 0) + _ebss = .; _end = . ; diff --git a/arch/m68k/mm/init_mm.c b/arch/m68k/mm/init_mm.c index bbe525434ccb..85c5f0eee9ff 100644 --- a/arch/m68k/mm/init_mm.c +++ b/arch/m68k/mm/init_mm.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #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