We can't move BSS up. I use non-standard bootloader and it eats this.
But SILO doesn't want, he says about multiple loadable segments in ELF file.
So the patch is not applicable. Sorry.
05.08.2013, 21:06, "Kirill Tkhai" <tkhai@xxxxxxxxx>:
> Check if __init_begin <= (some 4Mb aligned address) < __init_end.
> If true then flush corresponding 4Mb TLB page.
>
> Move BSS at the middle of the image to make initmem be last range
> of mapped kernel area.
>
> It's not likely case, but sometimes can be useful.
>
> I use flush_tlb_kernel_range which flushes 8K pages sequentially
> and only the first flush() has a result. It seems it's not necessary
> to introduce new function for one-time boot use...
>
> Signed-off-by: Kirill Tkhai <tkhai@xxxxxxxxx>
> CC: David Miller <davem@xxxxxxxxxxxxx>
> ---
> arch/sparc/kernel/head_64.S | 4 ++--
> arch/sparc/kernel/vmlinux.lds.S | 3 ++-
> arch/sparc/mm/init_64.c | 17 +++++++++++++++++
> 3 files changed, 21 insertions(+), 3 deletions(-)
> diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
> index 26b706a..81dbb74 100644
> --- a/arch/sparc/kernel/head_64.S
> +++ b/arch/sparc/kernel/head_64.S
> @@ -681,8 +681,8 @@ tlb_fixup_done:
> /* Clear the bss */
> sethi %hi(__bss_start), %o0
> or %o0, %lo(__bss_start), %o0
> - sethi %hi(_end), %o1
> - or %o1, %lo(_end), %o1
> + sethi %hi(__bss_stop), %o1
> + or %o1, %lo(__bss_stop), %o1
> call __bzero
> sub %o1, %o0, %o1
>
> diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S
> index 0bacceb..be57226 100644
> --- a/arch/sparc/kernel/vmlinux.lds.S
> +++ b/arch/sparc/kernel/vmlinux.lds.S
> @@ -64,6 +64,8 @@ SECTIONS
> /* End of data section */
> _edata = .;
>
> + BSS_SECTION(0, 0, 0)
> +
> .fixup : {
> __start___fixup = .;
> *(.fixup)
> @@ -141,7 +143,6 @@ SECTIONS
>
> . = ALIGN(PAGE_SIZE);
> __init_end = .;
> - BSS_SECTION(0, 0, 0)
> _end = . ;
>
> STABS_DEBUG
> diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
> index ed82eda..52bfcf8 100644
> --- a/arch/sparc/mm/init_64.c
> +++ b/arch/sparc/mm/init_64.c
> @@ -2079,6 +2079,21 @@ void __init mem_init(void)
> cheetah_ecache_flush_init();
> }
>
> +/* Flush locked TLB entry (entries) if it is used to map initmem range
> + * only, i.e. __init_begin <= (some 4Mb aligned address) < __init_end.
> + */
> +static void flush_initmem_tlb_entries(void)
> +{
> + unsigned long begin = round_up((unsigned long)(__init_begin), 1 << 22);
> + unsigned long end = round_up((unsigned long)(__init_end), 1 << 22);
> +
> + if (begin >= end)
> + return;
> +
> + pr_info("TLB: Flushing initmem range [%016lx, %016lx]\n", begin, end-1);
> + flush_tlb_kernel_range(begin, end);
> +}
> +
> void free_initmem(void)
> {
> unsigned long addr, initend;
> @@ -2108,6 +2123,8 @@ void free_initmem(void)
> if (do_free)
> free_reserved_page(virt_to_page(page));
> }
> +
> + flush_initmem_tlb_entries();
> }
>
> #ifdef CONFIG_BLK_DEV_INITRD
> --
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