diff options
| author | Andreas Schwab <schwab@linux-m68k.org> | 2014-04-24 12:24:48 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2014-05-28 10:11:54 +0200 |
| commit | 486df8bc4627bdfc032d11bedcd056cc5343ee62 (patch) | |
| tree | 758edca69ce10df13802ae2035f3f677552c61f4 /arch/m68k/kernel/head.S | |
| parent | 44074e892cc2e5579b8d75c37612fcf8d023554a (diff) | |
m68k: Increase initial mapping to 8 or 16 MiB if possible
If the size of the first memory chunk is at least 8 or 16 MiB increase the
initial mapping to 8 resp. 16 MiB instead of 4 MiB.
This makes it possible to
1. Map more memory in the first node without running out of space for the
page tables,
2. Boot kernels that don't fit in 4 MiB (e.g. multi_defconfig).
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
- Add support for 8 MiB,
- Store initial mapping size in head.S for later reuse,
- Add comment about large kernels.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel/head.S')
| -rw-r--r-- | arch/m68k/kernel/head.S | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/m68k/kernel/head.S b/arch/m68k/kernel/head.S index 15c8f55e4835..dbb118e1a4e0 100644 --- a/arch/m68k/kernel/head.S +++ b/arch/m68k/kernel/head.S @@ -292,6 +292,7 @@ .globl kernel_pg_dir .globl availmem +.globl m68k_init_mapped_size .globl m68k_pgtable_cachemode .globl m68k_supervisor_cachemode #ifdef CONFIG_MVME16x @@ -907,10 +908,21 @@ L(nocon): * * This block of code does what's necessary to map in the various kinds * of machines for execution of Linux. - * First map the first 4 MB of kernel code & data + * First map the first 4, 8, or 16 MB of kernel code & data */ - mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\ + get_bi_record BI_MEMCHUNK + movel %a0@(4),%d0 + movel #16*1024*1024,%d1 + cmpl %d0,%d1 + jls 1f + lsrl #1,%d1 + cmpl %d0,%d1 + jls 1f + lsrl #1,%d1 +1: + movel %d1,m68k_init_mapped_size + mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),%d1,\ %pc@(m68k_supervisor_cachemode) putc 'C' @@ -3730,6 +3742,9 @@ func_return console_plot_pixel __INITDATA .align 4 +m68k_init_mapped_size: + .long 0 + #if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \ defined(CONFIG_HP300) || defined(CONFIG_APOLLO) L(custom): |